MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: micky 32 on January 31, 2010, 07:29:14 pm
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I noticed today especially in 5th at WOT and at high speed the car for a split second feels like it cuts power and does it intermittently as it accelerates. Is this the begining of a coil pack failure because the car under normal driving and not floored it doesn't do it at all. I have put it on vagcom and there are no miss fire fault codes.
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Did you also log your requested and actual fuel rail pressure and boost?
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No not yet. I'm running a uprated pump with a KO4. when i say power cut it's only for a very very split second so i'm assuming it's a missfire?
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it would also be good for us to know your cars current spec std or modified.
year of car , mileage etc :happy2:
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how much fuel did u have in the car when it happend?
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08 Octavia vRS. Evom's, pump, full Miltek, forge twintercooler, KO4... 56k. Still on original coilpacks. Half tank of fuel. The car gives intermittent like jerks. I have a feeling i'm lucky to be on the ori coils at 56k?
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oh what remap you got?
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i had this problem last summer , only happened on hard accelaration/wot in the higher gears .
no fault codes came up , changed the coilpacks and spark plugs and never had any probs since :happy2:
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micky is revo stage 3.
I have similar thing on mine at the moment. its a recent addition.
ive changed MAF to no avail.
next im going to change the MAP sensor, the spark plugs, if its still there ill be looking into coilpacks, lambda sensors etc.
mater (carl) had misfires recently and i think he changed his MAF and MAP sensor on friday so he might be able to elaborate on his issues and see if his new sensors worked
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08 Octavia vRS. Evom's, pump, full Miltek, forge twintercooler, KO4... 56k. Still on original coilpacks. Half tank of fuel. The car gives intermittent like jerks. I have a feeling i'm lucky to be on the ori coils at 56k?
Sounds like you just have the 5200rpm flat spot that alot of people suffer from. Coilpacks and plugs dont make a difference to it, and neither did a new MAF.
Im still working on trying to find out why exactly it does it, and potentially will have made some progress on it shortly. Will know in a week or two.
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Micky, have you disconnected the battery recently? :smiley:
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Poverty it's not the flat spot you are talking about, this is totally a different thing. This suddenly happened today and it can happen at 3500 rpm at WOT in a high gear. Funnily i went out for a drive this evening and it was ok. I do have a nice set of RS4 coilpacks i'll try them if it returns. Hedge no i haven't disconnected the battery recently.
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Micky, have you disconnected the battery recently? :smiley:
Lol - I know what you're thinking Mr H ;-)
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micky if you still have VCDS handy i reckon yuo should do some logs. one of the guys like hedge or vRStu are besty placed to tel you what blocks to log. but if you can make your car do it again you might be able to see what is causing the issue.
id still look into the MAF/MAP sensors etc
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Micky, have you disconnected the battery recently? :smiley:
Lol - I know what you're thinking Mr H ;-)
what sort of issue would that cause. my misfire seemed to occur shortly after my i ran my battery flat. same day though i also had my cat back and new bosche spark plugs fitted as well
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3500 rpm is more fuel issue territory
as everyone says , logs are your friend :happy2:
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I'm not 100% sure it'll be fuel cut, as we know Micky has an AutoTech Fuel Pump fitted.
I'd be more inclined to think it's a software issue Micky, had you heard Simon (Sibart) has his misfire back again - Since disconnecting the battery for a clutch install.
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Interesting. However i have done nearly 10k since the KO4 conversion and this only came to light today so could it still be software related? If that is the case maybe a battery disconnect might make it ok for another 10k?. One thing i haven't mentioned is it probably is that hardest i have driven it since the bad ice since xmas. As the problem disappeared tonight maybe it's throat needed to be cleared lol
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There certainly has been some discussion over it being a software issue and in fact it was mentioned on Friday when I bumped into Simon that both yourself and Harry seem to have been ok so far.
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nope harry was suffering misfires on the awesomeGTI RR day the other weekend
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I drove 150 miles + today. As mysteriously as the glitches under WOT appeared they have mysteriously disappeared. It didn't do it once today....strange :happy2:
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anyone also looked into
1. the amount the tank is filled when the misfires occur?
2. the evap system recall for mkv's
3. fitting of a catch can kit (to avoid PCV)
just some thoughts
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2. the evap system recall for mkv's
3. fitting of a catch can kit (to avoid PCV)
just some thoughts
Not heard about the EVAP recall. Certainly wasn't any recalls when i had mine serviced just before Xmas.
Catch can makes no difference as i have one on mine and still had the issue.
I recently have started to get the 5200rpm flat spot etc (it did feel a bit like fuel cut but not as harsh more like a misfire) this holds for about 2-300 rpm then all is fine again.
At first i thought it could be the Tesco 99 my missus decided to fill up with (women bless them!) but after 2 full tanks of V-Power it was still there.
On friday i replaced the MAF & the MAP and now it seems to have disappeared. However i had to do a bit of a spirited drive the other day so that may have cleared it too.
What i can surmise is the following:
My missus does a short drive to work every day (about 3 miles) in which the car doesn't have much chance to reach full temp (it's usually just there by the time she reaches work).
As the ECU is an Adaptive ECU i think it alters itself to this driving style. When i get in the car i still drive normally within speed limits i just use the gears a lot differently to my missus.
After replacing the MAF & the MAP, i also cleaned the EVOMS filter to get rid of all the road grime etc, i had to do the spirited drive total was about 32 miles. Since then the car seems to be fine and although i posted originally i thought their was fu*k all difference the car now seems to be a lot stronger in the Mid-Range
So i think if you are suffering with the 5200rpm flat spot. Take the car for a bit of a spirited drive (15-20 miles) and it MAY just get everything back to normal.
Carl :happy2:
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anyone also looked into
1. the amount the tank is filled when the misfires occur?
2. the evap system recall for mkv's
3. fitting of a catch can kit (to avoid PCV)
evap recall????? what does the evap do as i have had that fault light twice now.
just some thoughts
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2. the evap system recall for mkv's
3. fitting of a catch can kit (to avoid PCV)
just some thoughts
Not heard about the EVAP recall. Certainly wasn't any recalls when i had mine serviced just before Xmas.
Catch can makes no difference as i have one on mine and still had the issue.
I recently have started to get the 5200rpm flat spot etc (it did feel a bit like fuel cut but not as harsh more like a misfire) this holds for about 2-300 rpm then all is fine again.
At first i thought it could be the Tesco 99 my missus decided to fill up with (women bless them!) but after 2 full tanks of V-Power it was still there.
On friday i replaced the MAF & the MAP and now it seems to have disappeared. However i had to do a bit of a spirited drive the other day so that may have cleared it too.
What i can surmise is the following:
My missus does a short drive to work every day (about 3 miles) in which the car doesn't have much chance to reach full temp (it's usually just there by the time she reaches work).
As the ECU is an Adaptive ECU i think it alters itself to this driving style. When i get in the car i still drive normally within speed limits i just use the gears a lot differently to my missus.
After replacing the MAF & the MAP, i also cleaned the EVOMS filter to get rid of all the road grime etc, i had to do the spirited drive total was about 32 miles. Since then the car seems to be fine and although i posted originally i thought their was fu*k all difference the car now seems to be a lot stronger in the Mid-Range
So i think if you are suffering with the 5200rpm flat spot. Take the car for a bit of a spirited drive (15-20 miles) and it MAY just get everything back to normal.
Carl :happy2:
MAF sensor didint remove the flat spot from mine, so MAP sensor it is, if not im changing hthe lambda sensor nexyt
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I have had a couple of 'contacts' mention this evap recall in relation to cars in the USA, but in the same breath as a possible indicator in the misfire issue too. im still digging :happy2:
I'm not sure but it may be this one
"20-07-06 Evaporative Emission (EVAP) System, Diagnostic Trouble Code Diagnosis (April 4, 2007)"
but I cant get the doc to check it, anyone got it?
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Well the misfire returned today suddenly and with a vengeance, car shuddering and like on 3 cylinders with the engine light flashing. Coil pack failed. The slight misfires i was getting must have been a warning one was about to go. It was an excuse to put my red RS4 ones in i got from the US 21 euro each delivered :happy2: Took about 20 miles or so for them to adapt, all is perfect now.
Here is a pic with them installed:
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fy195%2Fmickyhea%2Fcoilpacks.jpg&hash=39005a47f5e33dbccc66ece0dcf72d0b764e531d)
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Mickey you got a link for those coil packs?
Carl :happy2:
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x2 share those links cos that is well cheap.
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This is where i got them, they sell the normal ones too for around same price.
http://www.dbcperformance.com/product_p/06e905115e.htm
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how much was postage micky. seems a good little site. might look into getting a new lambda sensor and map sensor from here as well
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Can't remember to be honest, i got them just before xmas but in total it worked out something like 21 euro each including post. Excahnge rates may be different but i'd say it will work out half the price from a dealer anyway. Are you having misfire problems? My car is running sweet now.
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was looking in the checkout section https://www.dbcperformance.com/one-page-checkout.asp postage is about the same cost as 4 coil packs. yeah i have misfires. chnged the maf but to no avail. i just want to elliminate all things from the equation
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Found an email with qouted price. It was $125 delivered for the 4 of them, which at the moment is £80 sterling (£20each). When i ordered them before xmas the exchange was £73 dollar was weaker. I PM'd the seller direct on the US forum to see what the best he could do with post, try that... Have you ruled out coils? If not it could be your problem.
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which postage option did you use??
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I didn't go through the website. I PM'd the seller directly on the GTI american forum and asked what was the best he could do with postage and then paypalled him. His user name is DBCperformance
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thanks micky i will fire him an email now. :happy2:
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When i first fitted these yesterday i was getting random little missfires at WOT that as the miles went up they got less and less until they disappeared so i thought it was an adaption thing, but this morning they came back again. I'm not sure what to think whether they aren't suited to the application or maybe a spark plug is not great ( 30k on them). Others have had no problems fitting them so it might not be related to the RS4 coils but i'd hold off from ordering until i see what's causing the misfires.
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Going to change the plugs tonight. I got Bosch YTTRIUM plus. Will report back if it gets rid of the misfire.
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Replaced plugs and the slight misfire ( intermittent) at WOT is still there.. The red coils aren't to blame they are the same just a different colour. ECS tuning are doing a special on them for 79 dollars a set..
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I have cured the misfire :popcornsoda:. Turned boost from 8 to 7 and it stopped. Air temps may be a little low for 8 with an EVOM's on my car.