MK4 GTI Misfire

[MK2 GTI]

Hey all,
Got a MK4 GTI thats not firing on 4 cylinders, we changed plugs and coil packs, thats not the problem. Is there any other common problems that it would be? Thought i would ask before i get deeper into it.

[syncro]

Coil packs.

[Golf Loon]

H T Leads?

[syncro]

H T Leads?
You mean connectors? The leads last forever. (They're copper)

[h100vw]

You need to scan it with VAG-COM the amount it can tell you is amazing.

The only thing I have heard that fails all the time apart from coil packs is the water temp sender. Check you have a green one fitted the black ones are the duff ones.

Gavin

[Bug_racer]

You need to scan it with VAG-COM the amount it can tell you is amazing.

The only thing I have heard that fails all the time apart from coil packs is the water temp sender. Check you have a green one fitted the black ones are the duff ones.

Gavin


Vag com doesnt pick up misfires on a mk4 Golf .

The ignition module is on the side of the airbox near the MAF . Disconnect it and clean the 2 plug terminals and put it back in . Sometimes that fixes the problem . If it doesnt work try and find another one to swap it with

[MK2 GTI]

Syncro- Already changed coil packs, thats not the problem.

Golf Loon- Are you getting this mixed up with a 1.6/2ltr? Unless you mean those leads to the coil packs.

H100VW - Already changed the black temp probe to green a while back, I will scan it tomorow when i have time to look.

Bug_racer - I will try that.

Thanks for the info guys. I will look at it tommorow when i have time, i just thought there might be a common thing apart from coil packs.

[syncro]

Can you isolate any particular cylinder?

[MK2 GTI]

i havn't even looked at the car yet, i will tommorow though.

[h100vw]

Vag com doesnt pick up misfires on a mk4 Golf .

Is that a feature of the NA ECU cos I have seen it on 1.8Ts.

Gavin

[william]

Vag com doesnt pick up misfires on a mk4 Golf .

it does as has built in ociliscope

[h100vw]

Vag com doesnt pick up misfires on a mk4 Golf .

it does as has built in ociliscope

I think he may mean as a fault code in it's own right.
Gavin

[MK2 GTI]

Bug Racer- You were right, it was the ignition control module, runs fine now! I tell you what a MK4 GTI with a KO4 turbo and a GIAC chip goes good as! I wanna get a Audi A4 1.8T Quattro with the same mod now lol.

[GTIputih]

How do you know it is a misfire? Sorry for the silly question.. *newbie*

[mikinoz]

Fuel pump and/or filter?:/

[MK2 GTI]

How do you know it is a misfire? Sorry for the silly question.. *newbie*

Had no power, Engine was running really rough, you can feel it in the exhaust that its out of beat. You could unplug one of the coil plugs and it would still run the same. But its all fixed now.

[Bug_racer]

Is that a feature of the NA ECU cos I have seen it on 1.8Ts.

Gavin


I am yet to see it on a DBC 1.8T
DBW 1.8T's have it though . :)

[Bug_racer]

Bug Racer- You were right


I love hearing that :)

[DIDZ]

Hi Guys,

I don't know if it's a misfire or what, but sometimes the car just stalls (which is usually the case) when I've stopped.

This morning though, actually scared the fark out of me. Was accelerating then it jerked like I had got crunched from behind, totally losing power then regaining again.

Any hints ?

[Langers]

Hi Guys,

I don't know if it's a misfire or what, but sometimes the car just stalls (which is usually the case) when I've stopped.

This morning though, actually scared the fark out of me. Was accelerating then it jerked like I had got crunched from behind, totally losing power then regaining again.

Any hints ?

As usual, get the car scanned for codes. It's pointless speculating over the internet without at least a DTC readout.

[JayBee]

Hey guys. Have a similar problem but not sure if it's really a misfire or tuning problem.

Bought my Mk4 Gti with a powerchip already in it (don't think it really goes that much harder)
Anyway when you change gear and put the throttle down relatively quickly it coughs quite badly then comes good and accelerates through the gear no problem.

It will also show the same symptoms if you are crusing say in 4th and put the pedal to the floor quickly it coughs then seems to clear itself and continue on.

I'm not sure if it's a powerchip problem, general tuning issue or plugs or similar.

I have alot of experince with heavily modded cars, in particular EDIT's and ECU's however my understanding of the Powerchip is it not individually tunable on a dyno, more a plug and play one size fits all setup.

I am hoping it's a plugs or the like issue, but if anyone has experinced similar or knows what it is would be a big help.

Not sure if fuel economy is up, or it's generally high due to the Powerchip. Getting 500 k's av around town with realtively sedate driving.

Any guidance would be appreciated.

Thanks
JB:)

[gpk_gti]

hmmm ,I had a similar problem about 8 months ago.
Idle at lights was a bit jumpy SOMETIMES.would drop to 300rpm,nearly stall and idle ok.vag-com showed no faults.
driving back from n-syd one day and died.would not start or idle.got it towed to mechanic,and he sent me straight away to electrician.Found that MAF was dead.ordered one from bosch melb and fitted within 4 days.When I went to pick up ,still wasnt running good.
After some serious sweating ,we found that the plugs had been fowled from maf not working and car running rich.Quick clean of plugs(changed to new ones next day) and car ran fine after that.

[h100vw]

If the MAF has died, unplugging them usually gets the car running again. I have experienced a duff MAF on an A4, the car seemed to run OK but was no faster after it was chipped.

I was supplied another MAF that was really bad and the car barely ran at all. Fitting a brand new MAF had it going like a train.

Some odd issues occur with those MAFs at times

Gavin