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Model specific boards => Golf mk3 => Topic started by: Willo on 09 May 2012, 21:46

Title: Rough running HELP PLEASE
Post by: Willo on 09 May 2012, 21:46
Right this is a new problem my 1.4 8 v has developed a problem where she doesn't wanna go very fast seems to be holding back most of the time under load almost seems to be coughing tonight wouldn't go above 65 flat out on the motorway help please slightly concerned  :undecided:
Title: Re: Rough running HELP PLEASE
Post by: SCO_VAG on 10 May 2012, 00:49
Could be a number of things, 1st thing I would check is your ECU relay as these like to die from time to time, its located above the fuses and can cause a hole host of issues if faulty.
Title: Re: Rough running HELP PLEASE
Post by: Willo on 10 May 2012, 15:44
How do I check that ?
Title: Re: Rough running HELP PLEASE
Post by: mrsaunders on 10 May 2012, 16:09
Have a drive around then touch it to see if its warm if its cold then get a new one
Title: Re: Rough running HELP PLEASE
Post by: Willo on 10 May 2012, 16:33
Really is it that simple
Title: Re: Rough running HELP PLEASE
Post by: DUBboi12 on 10 May 2012, 17:18
Really is it that simple

Yep it really is :smiley:
Title: Re: Rough running HELP PLEASE
Post by: Willo on 10 May 2012, 17:36
I'll check on my way home from work tonight and come back and let you know the outcome thank you
Title: Re: Rough running HELP PLEASE
Post by: Dogbot on 10 May 2012, 17:41
Have a drive around then touch it to see if its warm if its cold then get a new one

I had one on my valver that was getting too hot, i mean like almost kettle boiling hot & breaking down under the heat, replaced it & the problem went away...
Title: Re: Rough running HELP PLEASE
Post by: thai-wronghorse on 10 May 2012, 21:09
It's a 1.4, they don't go fast.
Title: Re: Rough running HELP PLEASE
Post by: Willo on 11 May 2012, 00:34
Drove home checked all relays I could feel in the fuse box under the dash as not sure which is the ecu relay they were all cold ????????
Title: Re: Rough running HELP PLEASE
Post by: SCO_VAG on 11 May 2012, 00:59
Drove home checked all relays I could feel in the fuse box under the dash as not sure which is the ecu relay they were all cold ????????


Grab yourself a torch or phone light, just above the row of fuses, they're are square shaped plugs, the one with number 30 on it is the ECU one, when they fail they cause juddering and general poor running usually around 3000rpm as the ECU is restricting the revs due to it not getting the correct power supply. If youv got the money you could pick one up fairly cheap from VW which is what I done.. had a brand new car :smiley:
Title: Re: Rough running HELP PLEASE
Post by: Willo on 11 May 2012, 22:16
Does anyone know the price and part number of the ecu relay as that is going to be my first port of call
Title: Re: Rough running HELP PLEASE
Post by: SCO_VAG on 12 May 2012, 18:38
Part number: 165 906 381
Title: Re: Rough running HELP PLEASE
Post by: DUBboi12 on 12 May 2012, 18:55
I've got a spare one £5 delivered and it yours, got it when I was having problems with my GTI 8v but it wasn't the problem for me. Let me know
Title: Re: Rough running HELP PLEASE
Post by: Willo on 12 May 2012, 19:26
Is it in good condition mate ?
Title: Re: Rough running HELP PLEASE
Post by: DUBboi12 on 12 May 2012, 19:30
Yes mate it is :smiley: