MK5 Golf GTI
All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Rawson on July 16, 2017, 12:31:46 pm
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Hi people.
My Ed 30 had been acting strange recently, it all started with the engine completely cutting out every now and then, it would always happen when I've been driving for an hour or so and the engine is hot. and when I've come out of gear/slowing down for a junction/lights. I would see the revs drop right down to zero then it would cut out. However it always starts immediately back up.
Now it is doing the same thing but even worse, when I come out of gear at a junction and I'm slowing down( foot only on brake pedal) the revs drops down and then back up - revving by itself a few times before cutting out or going back to idling like normal.
The car is fine when it's idling, this is only happening once the engine is warmed up.
I have checked for boost leaks and can't find any.
I have changed the PCV to latest revision,
Checked DV perfectly fine no splits or cracks
I changed n75 valve with new pipe.
Fitted new MAF sensor after checking the wiring loom first for splits or craclaim
As I had code (P0100 G70 maf - supply voltage intermittent) couldn't find any splits or cracks.
Fitted new maf and that code is gone now ( also my MPG has shot right up so I guess that maf was on its way out anyway)
But my problem still persists!
I have VCDS and have been logging, has anyone experienced anything like this before with there MK5?
Any ideas what more I can log?
Logged misfires, Maf, fuel trims, engine speed so far and they all looked fine.
Any help much appreciated folks
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Have you checked the condition of your HPFP sensor? and when was the last time you did the Cam Follower?
Also how's the voltage on the battery?
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I can't say I've checked that sensor. Cam follower was changed not long after a I purchased the car. Battery voltage is fine.
The car is currently being investigated by my mechanics so will report back on what they find
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Clutch switch? or Throttle position sensor?
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Where would I find the clutch switch? I thought edition 30 did not have one, couldn't find anything about them online!
And where would the throttle position sensor be?
Thanks
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On or behind the pedal. They do have a clutch switch, primarily for cruise control I think, but (thank god) the ED30 didn't get that piece of sh*t stop-start crap, whereas the S3 did.
Throttle sensor is part of the throttle body. I doubt it's that, or the pedal. Neither are serviceable.
If it's not an air leak or anything obvious, you'll need to take it somewhere for some live diagnostics.
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I've found out the clutch switch is on the clutch master cylinder,
Will check that when I get a chance, it's currently in the mechanics so hopefully they find and fix the problem
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Did you manage to get this sorted mate? My cupra has very similar symptoms ,random stalling & blips of throttle etc :fighting:
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I picked it up from the mechanics yesterday, they changed the fuel filter and also the low fuel pressure sensor as they said there was a drop in fuel before it cut out.
However on the way home I noticed it is still slightly revving by itself like before, but it has not cut out yet so I guess they are two different problems.
Need to have a look at the clutch switch next I think
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I've already replaced my clutch switch mate, and mines still the same so i'd save your money if I was you.
I'm thinking its a throttle issue, throttle body might need a clean & alignment. Mines booked in for next week, failing that throttle position sensor. I'll let you know how I get on...
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Have you checked the condition of your HPFP sensor? and when was the last time you did the Cam Follower?
Also how's the voltage on the battery?
How would the voltage battery affect this? I was told when my car got mapped my battery had a low voltage, would this be a factor to this problem?
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You two got intake kits?
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You two got intake kits?
Yea mate revo kit
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
What would cause it to go lean? Only reason why I think mine is something to do with the throttle, is because sometimes on part throttle at motorway speeds it feels like its fluctuating/jerking
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
What would cause it to go lean? Only reason why I think mine is something to do with the throttle, is because sometimes on part throttle at motorway speeds it feels like its fluctuating/jerking
Usually the MAF scaling on intake kits, but if it's not that, it will just be a good old fashioned air leak.
Mine's like that as well, at very small throttle inputs......sat behind someone doing 65-70 and coming on/off the throttle for example. It's also like that lower speeds in the lower gears, say 3rd, it's hard to maintain a constant speed.
Mine's only been like that since remapped with a linear pedal map. I bet if I was to get that put back to the factory non-linear pedal map, it would smooth all that out. I still need to get that done at some point, or bin it off and just go back to Revo. That map was smooth everywhere.
A bad throttle would fault code. I thought the same as you bought a brand new throttle from VW, revision Q, and it made zero difference.
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
What would cause it to go lean? Only reason why I think mine is something to do with the throttle, is because sometimes on part throttle at motorway speeds it feels like its fluctuating/jerking
Usually the MAF scaling on intake kits, but if it's not that, it will just be a good old fashioned air leak.
Mine's like that as well, at very small throttle inputs......sat behind someone doing 65-70 and coming on/off the throttle for example. It's also like that lower speeds in the lower gears, say 3rd, it's hard to maintain a constant speed.
Mine's only been like that since remapped with a linear pedal map. I bet if I was to get that put back to the factory non-linear pedal map, it would smooth all that out. I still need to get that done at some point, or bin it off and just go back to Revo. That map was smooth everywhere.
A bad throttle would fault code. I thought the same as you bought a brand new throttle from VW, revision Q, and it made zero difference.
Where did you have it mapped?
I'm going to try a tb clean & alignment first as it hasn't had it done since i bought it. Mine used to take a while for the revs to drop, and randomly blip throttle before I had it mapped so i think it's just gotten worse over time. Luckily it's not all the time
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You two got intake kits?
Yes I've also got a revo intake
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
What would cause it to go lean? Only reason why I think mine is something to do with the throttle, is because sometimes on part throttle at motorway speeds it feels like its fluctuating/jerking
Usually the MAF scaling on intake kits, but if it's not that, it will just be a good old fashioned air leak.
Mine's like that as well, at very small throttle inputs......sat behind someone doing 65-70 and coming on/off the throttle for example. It's also like that lower speeds in the lower gears, say 3rd, it's hard to maintain a constant speed.
Mine's only been like that since remapped with a linear pedal map. I bet if I was to get that put back to the factory non-linear pedal map, it would smooth all that out. I still need to get that done at some point, or bin it off and just go back to Revo. That map was smooth everywhere.
A bad throttle would fault code. I thought the same as you bought a brand new throttle from VW, revision Q, and it made zero difference.
Where did you have it mapped?
I'm going to try a tb clean & alignment first as it hasn't had it done since i bought it. Mine used to take a while for the revs to drop, and randomly blip throttle before I had it mapped so i think it's just gotten worse over time. Luckily it's not all the time
Stealth Racing. It was my choice to go linear and they know I'm not a fan of it, just need to go back up there and switch it back. Otherwise it's a great map.
Have you checked the throttle body loom? There was a TSB about it on the MK5 for fraying and shorting out, causing weird behavior. Not sure if that applies to the Seat platform. I checked mine and it was fine, plus a brand new throttle and still no better. It's more of a minor irritancy than a problem. Mine idles perfectly. Sounds like yours is a lot worse! Have you got meth injection on yours? I've heard the plastic part of the throttle doesn't like meth.
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Both Revo intakes then. Both remapped?
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
Cool, I'm gonna do some logs on vcds tomorrow see what it's saying
Need to get another engine cover too so I can test, I cut mine up to fit the revo
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Both Revo intakes then. Both remapped?
No mine isn't remapped yet, want to get it running smooth first
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Both Revo intakes then. Both remapped?
No mine isn't remapped yet, want to get it running smooth first
That could be why yours isn't too happy. It's pulling in a lot more air than it's expecting. Needs a map really. What does block 032 say in VCDS? Idle and part throttle trims.
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Both Revo intakes then. Both remapped?
No mine isn't remapped yet, want to get it running smooth first
That could be why yours isn't too happy. It's pulling in a lot more air than it's expecting. Needs a map really. What does block 032 say in VCDS? Idle and part throttle trims.
Possibly yeah,
I will have a look tomorrow and see what there saying.
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
What would cause it to go lean? Only reason why I think mine is something to do with the throttle, is because sometimes on part throttle at motorway speeds it feels like its fluctuating/jerking
Usually the MAF scaling on intake kits, but if it's not that, it will just be a good old fashioned air leak.
Mine's like that as well, at very small throttle inputs......sat behind someone doing 65-70 and coming on/off the throttle for example. It's also like that lower speeds in the lower gears, say 3rd, it's hard to maintain a constant speed.
Mine's only been like that since remapped with a linear pedal map. I bet if I was to get that put back to the factory non-linear pedal map, it would smooth all that out. I still need to get that done at some point, or bin it off and just go back to Revo. That map was smooth everywhere.
A bad throttle would fault code. I thought the same as you bought a brand new throttle from VW, revision Q, and it made zero difference.
Where did you have it mapped?
I'm going to try a tb clean & alignment first as it hasn't had it done since i bought it. Mine used to take a while for the revs to drop, and randomly blip throttle before I had it mapped so i think it's just gotten worse over time. Luckily it's not all the time
Stealth Racing. It was my choice to go linear and they know I'm not a fan of it, just need to go back up there and switch it back. Otherwise it's a great map.
Have you checked the throttle body loom? There was a TSB about it on the MK5 for fraying and shorting out, causing weird behavior. Not sure if that applies to the Seat platform. I checked mine and it was fine, plus a brand new throttle and still no better. It's more of a minor irritancy than a problem. Mine idles perfectly. Sounds like yours is a lot worse! Have you got meth injection on yours? I've heard the plastic part of the throttle doesn't like meth.
Mine idles fine, its coming to a stop where it stalls/throttle blips randomly :thinking: no meth mate no, only thing can do is see if tb alignment sorts it & go from there. Big problem for me however is no VCDS :doh:
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
What would cause it to go lean? Only reason why I think mine is something to do with the throttle, is because sometimes on part throttle at motorway speeds it feels like its fluctuating/jerking
Usually the MAF scaling on intake kits, but if it's not that, it will just be a good old fashioned air leak.
Mine's like that as well, at very small throttle inputs......sat behind someone doing 65-70 and coming on/off the throttle for example. It's also like that lower speeds in the lower gears, say 3rd, it's hard to maintain a constant speed.
Mine's only been like that since remapped with a linear pedal map. I bet if I was to get that put back to the factory non-linear pedal map, it would smooth all that out. I still need to get that done at some point, or bin it off and just go back to Revo. That map was smooth everywhere.
A bad throttle would fault code. I thought the same as you bought a brand new throttle from VW, revision Q, and it made zero difference.
Where did you have it mapped?
I'm going to try a tb clean & alignment first as it hasn't had it done since i bought it. Mine used to take a while for the revs to drop, and randomly blip throttle before I had it mapped so i think it's just gotten worse over time. Luckily it's not all the time
Stealth Racing. It was my choice to go linear and they know I'm not a fan of it, just need to go back up there and switch it back. Otherwise it's a great map.
Have you checked the throttle body loom? There was a TSB about it on the MK5 for fraying and shorting out, causing weird behavior. Not sure if that applies to the Seat platform. I checked mine and it was fine, plus a brand new throttle and still no better. It's more of a minor irritancy than a problem. Mine idles perfectly. Sounds like yours is a lot worse! Have you got meth injection on yours? I've heard the plastic part of the throttle doesn't like meth.
Mine idles fine, its coming to a stop where it stalls/throttle blips randomly :thinking: no meth mate no, only thing can do is see if tb alignment sorts it & go from there. Big problem for me however is no VCDS :doh:
Yeah mine idles fine too. And like you say when coming to a stop you get the blips on the revs, mine is slightly better since they changed the fuel filter and the sensor, hasn't cut out yet anyway. Will get on vcds tomorrow
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Sounds like it's going lean coming down to idle and the ECU is struggling to 'catch' it, so stalls or over compensates (over revving).
Need to log the MAF and lambda regulator channels in VCDS and see what numbers you get as the revs fall to idle. MAF is usually around 3-4gs with the stock airbox and lambda activity should be small. If it jumps up a large amount 15% or more, it's defo lean, or the MAF scaling isn't right.
Bung the factory airbox on for a test, to see if the problem goes away?
What would cause it to go lean? Only reason why I think mine is something to do with the throttle, is because sometimes on part throttle at motorway speeds it feels like its fluctuating/jerking
Usually the MAF scaling on intake kits, but if it's not that, it will just be a good old fashioned air leak.
Mine's like that as well, at very small throttle inputs......sat behind someone doing 65-70 and coming on/off the throttle for example. It's also like that lower speeds in the lower gears, say 3rd, it's hard to maintain a constant speed.
Mine's only been like that since remapped with a linear pedal map. I bet if I was to get that put back to the factory non-linear pedal map, it would smooth all that out. I still need to get that done at some point, or bin it off and just go back to Revo. That map was smooth everywhere.
A bad throttle would fault code. I thought the same as you bought a brand new throttle from VW, revision Q, and it made zero difference.
Where did you have it mapped?
I'm going to try a tb clean & alignment first as it hasn't had it done since i bought it. Mine used to take a while for the revs to drop, and randomly blip throttle before I had it mapped so i think it's just gotten worse over time. Luckily it's not all the time
Stealth Racing. It was my choice to go linear and they know I'm not a fan of it, just need to go back up there and switch it back. Otherwise it's a great map.
Have you checked the throttle body loom? There was a TSB about it on the MK5 for fraying and shorting out, causing weird behavior. Not sure if that applies to the Seat platform. I checked mine and it was fine, plus a brand new throttle and still no better. It's more of a minor irritancy than a problem. Mine idles perfectly. Sounds like yours is a lot worse! Have you got meth injection on yours? I've heard the plastic part of the throttle doesn't like meth.
Mine idles fine, its coming to a stop where it stalls/throttle blips randomly :thinking: no meth mate no, only thing can do is see if tb alignment sorts it & go from there. Big problem for me however is no VCDS :doh:
Yeah mine idles fine too. And like you say when coming to a stop you get the blips on the revs, mine is slightly better since they changed the fuel filter and the sensor, hasn't cut out yet anyway. Will get on vcds tomorrow
Keep us updated pal :smiley:
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Both Revo intakes then. Both remapped?
No mine isn't remapped yet, want to get it running smooth first
That could be why yours isn't too happy. It's pulling in a lot more air than it's expecting. Needs a map really. What does block 032 say in VCDS? Idle and part throttle trims.
Block 032 says 0.3% adaption idle & adaption partial is 5.5%
I done some fuel trim logs too and it was bang on with what the ecu was requesting.
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Small trims. Have you still got the oem intake? Could be worth sticking that on for an experiment to see if matters improve.
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No I need to pick one up so I can see what it's like with that on.
One of my mates has put a few intakes on ed 30's before and never had any problems like this though.
I took it for a long drive the other week and after around 3 hours of motorway driving it cut out when I stopped at some lights, then about 5 mins after that the engine cut out as i was driving over a bridge!
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Having the same problem with mine as of recent, coming to stop, putting in neutral car was cutting out. Checked and the EVOMS intake had popped off, I've attached it back on but it still can't seem to hold revs. When coming to a stop in neutral it will drop to around 400rpm then spike up then go to normal, also revving on its own in neutral. Let me know how you get on mate, will be getting mine in the garage this week hopefully so will let you know my findings too.
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See if it improves with the MAF disconnected.
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See if it improves with the MAF disconnected.
I Just drove home with the MAF disconnected, had no issues with the revs
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When mine was doing this, I found a big air leak on the pcv pipe leading to the inlet manifold ...drove fine with maf disconnected... haven't read the whole thread and maybe you've explored that route...
Edit: didn't have the engine cutting out on me though, just a rough idle and the engine jerking back and forth
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SOLVED!
Picked up a new diverter valve even though the old one had no cracks or tears on.
Old DV was a rev c, put on a rev G and it's been fine since, actually feels much better to drive and no madness with the revs!
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SOLVED!
Picked up a new diverter valve even though the old one had no cracks or tears on.
Old DV was a rev c, put on a rev G and it's been fine since, actually feels much better to drive and no madness with the revs!
That crazy, I replaced mine the other day without seeing your post and it's fixed mine too. Original had no rips or tears or anything.
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Fickle engines these. Glad you've sorted it boys :happy2:
You might want to check your cam sensor too. Seems they like to get coated in metallic crusties which also affects how they run. You don't get a code from it though, weirdly. 3 people I know have changed the cam sensor and reported better running. I also found a 5mpg increase and massively improved idle and off boost smoothness.
(https://farm5.staticflickr.com/4334/35727744203_332fd6b132_b.jpg)