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Model specific boards => Golf mk4 => Topic started by: niliano on 12 January 2016, 08:22

Title: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 08:22

Hi Guys,

MK4 Golf 1.8T AGU engine Code

I have a issue and wanted to ask your opinions!

The other day I went out for a drive to Halfords to get a few bits to fix my door handle (was loose!) and the car to Halfords was running absolutely fine, didn't miss a beat accelerated and boosted exactly how it should be.

When I left Halfords and went up a ramp to a motorway and boosted the car all of a sudden shuddered and lost a lot of power.

Nursing the car which now sounds like a Subaru home I was barely able to get past 30 mph and going up a hill I was doing 20mph at 1mpg!

Checked the coil packs and cylinder 4 was the issue, As disconnecting the other 3 when engine was running made the engine shudder, Disconnect 4 and the car didn't change at all.

Put a new coilpack in and still the same outcome. moved coil packs around and again 4 was still the same.

Took the spark plug out of cylinder 4 and the tip was discoloured (almost white)

Today I have ordered 4 spark plugs (NGK ones) and 3 ignition coils.

If this doesn't work could anyone else shed light?

Do you think im on the right path to fixing this?

Ever since putting the spark plug from cylinder 4 to cylinder 3 the car isn't running as lumpy but still sounds like a Subaru!

Many thanks in advance

Title: Re: Mk4 Golf Running Very Lumpy
Post by: barrym381 on 12 January 2016, 12:32

I would be checking your ignition amp as coil packs very rarely fail on the agu  :smiley:

Title: Re: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 12:53

forgive my stupidity

where would I find that?

Title: Re: Mk4 Golf Running Very Lumpy
Post by: barrym381 on 12 January 2016, 12:58

Quote from: niliano on 12 January 2016, 12:53

forgive my stupidity

where would I find that?

have a read at this  :smiley:

http://www.golfgtiforum.co.uk/index.php?topic=206325.0

Title: Re: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 13:01

cool thanks :) ill have a read!!!!

Title: Re: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 13:02

where would it be? as I haven't got the standard air box anymore

Title: Re: Mk4 Golf Running Very Lumpy
Post by: barrym381 on 12 January 2016, 13:05

Quote from: niliano on 12 January 2016, 13:02

where would it be? as I haven't got the standard air box anymore

mine is bolted to the bulkhead as my air box is gone too  :smiley:

Title: Re: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 13:23

ok I don't recall seeing it but if what your saying then ill have a look :)

Title: Re: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 13:29

would it be loose?

the car came with a air filter already fitted so I don't know where it would be haha

Title: Re: Mk4 Golf Running Very Lumpy
Post by: barrym381 on 12 January 2016, 13:35

Quote from: niliano on 12 January 2016, 13:29

would it be loose?

the car came with a air filter already fitted so I don't know where it would be haha

I have seen them left loose in the past so have a good look about the airbox area  :smiley:

have a look at some google images so you know what your looking for  :smiley:

https://www.google.co.uk/search?q=mk4+golf+1.8t+ignition+amplifier&biw=1366&bih=599&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwix5K3VsaTKAhUCvxQKHadqDvQQsAQIHg#imgrc=5SSalIEPVGer2M%3A

Title: Re: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 13:40

cool thanks for your help (again) lol

also

I did find some oil on the spark plugs? I have been told this is kinda common? its not a lot its just a bit around the porcelain and the tip

Title: Re: Mk4 Golf Running Very Lumpy
Post by: barrym381 on 12 January 2016, 14:42

there is a gasket that fails causing this pretty easy to sort though  :smiley:

Title: Re: Mk4 Golf Running Very Lumpy
Post by: niliano on 12 January 2016, 15:02

ok no problem thanks again :D