MK5 Golf GTI
All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Weston on September 22, 2011, 10:37:02 am
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Since my remap I've thought a few times that the car has been running a bit odd. Just now, slight incline, 30mph, 5th gear, 1500rpm & the engine seemed to be behaving strangely. The revs dropped slightly then came back. This happened all the way up the hill. If I put my foot down it runs fine and only does this occasionally. The other times have been less obvious.
Any ideas?
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^
Random misfires are often a sign of a coilpack on the way out. Best to check (VAGcom log thingy) before it fails totally and potentially does damage.
Remapped 2.0T FSI engined cars should ideally have their plugs renewed every 10k miles.
Someone else will chip in re what else it could be.
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Cheers :happy2:
New plugs fitted in March, coil packs on the recall done in July
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Then the next question might be which remap?
Someone who can laptop log would doubtless be able to help more than me.
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R Tech stage 1. I'll see if I can find a member with VCDS close to me (Bristol)
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The R-Tech guy is normally very caring and helpful. But VCDS best starting point. Possibly a setting on the map but I'm guessing wildly.
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I know Nick will be more than happy to have a look for me, and I'm not suggesting it's the remap either as I've only heard positive things about them. I reckon the remap has possibly exposed a weakness somewhere, although my mechanical knowledge is zero.
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Is it running a bit lumpy at idle? PCV maybe?
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Is it running a bit lumpy at idle? PCV maybe?
Idle seems fine. New PCV fitted at same time as remap, although that could be the issue. It makes some squeaks, which I think is caused by air in the PCV,
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Cheers :happy2:
New plugs fitted in March, coil packs on the recall done in July
Don't exclude a new faulty coil pack as one member on here found out...
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Well I've scanned the car today and there's no codes at all :confused:
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Well I've scanned the car today and there's no codes at all :confused:
Sick of this myself every 3-5k miles now, need a health check to see if there's an underlying problem
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When yours does it what's it like?
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When yours does it what's it like?
Started off very slight when accelerating in 4,5 or 6th as if lost power for a fraction. 100 mikes later it was a prominent stutter. Switched to stock map to get to garage for new plugs
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Hmm maybe it's not the same thing. Mines very intermittent. I wonder if it's the DSG hesitating on a change?
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Mines certainly the misfire I've suffered lots of times before. Sorry for the rushed explanation was a flying toilet break at services onthe way to the airport.
Strangely it Isn't noticeable after switching back to st2+ .... Neeeed to find somewhere suitable to do some logs....
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What map are you on now? APR still? What stage map were you running before you went back to 2+?
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What map are you on now? APR still? What stage map were you running before you went back to 2+?
Still APR till Xmas. Started missing & stuttering on 2+ map, switched to stock and wasn't noticeable, switched back to 2+ for last 30 - 40 miles and wasn't stuttering. Was alot less weight in the car on the way back (less load on the engine?)
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Hmm maybe it's not the same thing. Mines very intermittent. I wonder if it's the DSG hesitating on a change?
....I think a DSG hesitation feels different from a misfire. For a start the DSG hesitation will only happen at the exact moment of your shifting whereas a misfire is usually more throttle related.
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What map are you on now? APR still? What stage map were you running before you went back to 2+?
Still APR till Xmas. Started missing & stuttering on 2+ map, switched to stock and wasn't noticeable, switched back to 2+ for last 30 - 40 miles and wasn't stuttering. Was alot less weight in the car on the way back (less load on the engine?)
And now started doing it again, cool evening st2+ map. 4th noticeable most. 10 miles of 102ron bp ultimate left.
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Hmm maybe it's not the same thing. Mines very intermittent. I wonder if it's the DSG hesitating on a change?
....I think a DSG hesitation feels different from a misfire. For a start the DSG hesitation will only happen at the exact moment of your shifting whereas a misfire is usually more throttle related.
I need it to happen again so I can decide. Haven't had any issues with the gearbox so far...
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Sorry for the mini hi jack Weston :ashamed:
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Sorry for the mini hi jack Weston :ashamed:
No worries, it doesn't bother me :happy2:
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Goin to buy more damn plugs in the morning :mad:
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Well it's done it again. This time with a flashing EML, although it stopped flashing when the juddering stopped. I've now noticed it happens mainly when going uphill. Should be able to scan it tomorrow (not VCDS though)
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Had mine checked today. The same happens under load (Uphill or high gears)
Dealer swapped plugs to see if it moved from Cyl 3 but it didnt, then new coilpack and no change. New Rev PCV next week then looking at injector :sad:
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Injector would make sense. It doesn't do it driving gently, but if I accelerate quicker than normal driving is does it a little bit
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Who's your remap Weston out of interest?
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Who's your remap Weston out of interest?
R-Tech :happy2:
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Have you approached them about this fault as yet?
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John_o had similar symptoms which were caused by faults in APR sofware, discovered and rectified by Awesome Gti...
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Have you approached them about this fault as yet?
Not at the moment, I think I probably should get in touch
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Can you log individual injectors...?
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Can you log individual injectors...?
Possibly. Had it checked for codes, intermittent misfire cylinder 3 & intermittent random / multiple misfire.
I've borrowed the thing so I should be able to do some live logging & reproduce the misfire
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Can you log individual injectors...?
Possibly. Had it checked for codes, intermittent misfire cylinder 3 & intermittent random / multiple misfire.
I've borrowed the thing so I should be able to do some live logging & reproduce the misfire
Same faults as mine it's like a tfsi virus!
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Hopefully it's just cylinder 3. Might gave to swap the plug & coil pack with another and see off the fault moves
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Hopefully it's just cylinder 3. Might gave to swap the plug & coil pack with another and see off the fault moves
That's what I did yesterday and it stayed on cyl 3 :(
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Just done some logging. Noticed for knock sensor voltage cylinder 1, 2 & 4 were all 0.156 V and cylinder 3 was 0.312 V. Could this be my issue? Are there separate knock sensors?
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There are only 2 knock sensors.
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There are only 2 knock sensors.
That's odd then :confused:
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Sounds like cylinder or valve trouble to me
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Sounds like cylinder or valve trouble to me
What should I check for / replace Steve?
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Compression test, to check for 4 uniform compression readings, maybe a rouge spark plug out of the set you bought back in march .
Have you taken the plugs out to see the colour of them?
Unlikely to be an injector if your getting knock sensor imbalance IMO.
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Hello,
I dont thik It will be the remap code as I have not had any issues in the past, but the map and getting the car on full power by fixing the PCV could have highlighted under laying issues, as part of the r-tech remap map we do offer customers a life time of ownership help and advice, in return for a packet of hobnobs each time. :grin:
You more than welcome to pop to us for a foc loging session on the dyno, which should help point you in the right direction. It could be a coil pack (even the new ones give up easy) Once its on the dyno I can easy check the fuel and ignition out in around 30 mins, plus we have plugs and coil packs in stock which we can trial and error test with. Just drop Jim a line at the workshop and he will find a slot which is good for you.
Nick R-Tech
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Hello,
I dont thik It will be the remap code as I have not had any issues in the past, but the map and getting the car on full power by fixing the PCV could have highlighted under laying issues, as part of the r-tech remap map we do offer customers a life time of ownership help and advice, in return for a packet of hobnobs each time. :grin:
You more than welcome to pop to us for a foc loging session on the dyno, which should help point you in the right direction. It could be a coil pack (even the new ones give up easy) Once its on the dyno I can easy check the fuel and ignition out in around 30 mins, plus we have plugs and coil packs in stock which we can trial and error test with. Just drop Jim a line at the workshop and he will find a slot which is good for you.
Nick R-Tech
Cheers Nick I was gonna give you a call anyway. Just rang up and was told anytime Monday will be fine so I'll come up then, probably be there around 11 :happy2:
Chris
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Just driven home from work & a warning to check the oil has come on. Must admit I've not checked it for a while, could this be related to my problems, or even the cause?