GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: brendan on 14 April 2010, 10:52
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I really need some urgent help on my MK4 GTi Turbo.
Yesterday my car started missfiring really badly and had no power at all so I had to pull over. I called the AA out and he diagnosed it with a scanner as Cylinder Number 3 missfire. I changed all the Coil Packs a month ago for genuine VW items and also the spark plugs. I pulled the coil pack out and put it back in, then started the engine and it started as normal. It then stayed like this all day with no problems, as I drove at least 80 miles yesterday. Great I thought, problem solved!
No, Maybe not. This morning whilst driving the car, the same thing happened again. So luckily I was driving past an auto electrics place near me and got them to have a look at it. Exactly the same problem again, so I pulled the coil pack out and put it pack in again. The car worked as normal.
He seems to think that there is a possible ECU fault, and that I need to get it on a proper VW scanner. I've also asked a few other places and they all seem to think the same. I'm worried this is going to cost me a fortune now as I don't like the sound of a new ECU.
The car will hopefully be going up to R-Tech later if I can get a lift, but in the mean time can anyone help me?
Thanks.
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Dodgy wiring to the coilpack?
A VAGCOM scan will only show up the same as the AA fault codes.
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I'm not sure tbh, it could be. Its very intermitant. I'm really lost now.
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Have you tried another coil pack? It may be worth it, if it don't fix it you could rule it out and keep it as a spare in your car if any of the other ones go?!
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have you swapped the coil pack from one cylinder to another?
if the mis-fire occurs on the other cylinder then you know the coilpack is at fault, if it occurs on the same cylinder then its possibly a wiring fault
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Have you tried another coil pack? It may be worth it, if it don't fix it you could rule it out and keep it as a spare in your car if any of the other ones go?!
Yup I put the spare one in yesterday and it cured it, thought that was the end of it. Then it happened again this morning so I put the new one back in and its ok again.
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Have you tried another coil pack? It may be worth it, if it don't fix it you could rule it out and keep it as a spare in your car if any of the other ones go?!
Yup I put the spare one in yesterday and it cured it, thought that was the end of it. Then it happened again this morning so I put the new one back in and its ok again.
sounds like a possible wiring fault then :undecided:
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have you swapped the coil pack from one cylinder to another?
if the mis-fire occurs on the other cylinder then you know the coilpack is at fault, if it occurs on the same cylinder then its possibly a wiring fault
I've tried two coil packs in the same cylinder and it's happened twice now. Where do I start with the wiring?
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Ah so it's got to be a wiring fault. That rules out the coil pack.
The witing runs from the plug across and down the back behind the TIP I think.
Mr_Orange changed his coilpack harness on here and got a heat shield from the Audi TT to stop the detiration again. Although I can't find any links. :(
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Although I can't find any links. :(
This one :tongue: (http://www.golfgtiforum.co.uk/index.php?topic=120994.0)
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Ah I didn't know anyone put it in there. Now can I have that 10 minutes of my life back please Rhys?
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Ah I didn't know anyone put it in there. Now can I have that 10 minutes of my life back please Rhys?
I'll think about it
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Ha thanks you two.
Looks like a good guide, I'll pop down VW now and have a look. It mentions that theres two loom though, one with an oil sensor and one without?
Surely if they have my chasis number they can pick up which one I need?
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Probably, Don't expect the part anytime soon though....Get the heat shield too!
I think you'll need the same loom as Mr_O and Greg got as they've got the same engine as you.
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Probably, Don't expect the part anytime soon though....Get the heat shield too!
I think you'll need the same loom as Mr_O and Greg got as they've got the same engine as you.
Yeah mines an AUM. I take it theres a long wait then?
I kind of need it now as it doesn't like to drive very far at the minute.
Would you say this is more likely than a faulty ECU then?
I hope so.
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Probably, Don't expect the part anytime soon though....Get the heat shield too!
I think you'll need the same loom as Mr_O and Greg got as they've got the same engine as you.
Yeah mines an AUM. I take it theres a long wait then?
I kind of need it now as it doesn't like to drive very far at the minute.
Would you say this is more likely than a faulty ECU then?
I hope so.
Its very rare that the ECU develops a fault - they are fairly robust
On that thread there is a mention of a 4 week wait :sad:
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Trouble is VW don't often know how long the part is going to take to arrive. I guess you could phone them up and ask them, may save you a trip?
Why don't you have a look at the harness at the back and see if they're any splits and repair temporarily.
Also we're not saying it's definitely thew wiring harness, but one thing to rule out. Get some picture of it up.
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Probably, Don't expect the part anytime soon though....Get the heat shield too!
I think you'll need the same loom as Mr_O and Greg got as they've got the same engine as you.
Yeah mines an AUM. I take it theres a long wait then?
I kind of need it now as it doesn't like to drive very far at the minute.
Would you say this is more likely than a faulty ECU then?
I hope so.
Its very rare that the ECU develops a fault - they are fairly robust
On that thread there is a mention of a 4 week wait :sad:
Yeah I spotted that :(. I'll have a drive down now as it isn't far and see what they say.
Trouble is VW don't often know how long the part is going to take to arrive. I guess you could phone them up and ask them, may save you a trip?
Why don't you have a look at the harness at the back and see if they're any splits and repair temporarily.
Also we're not saying it's definitely thew wiring harness, but one thing to rule out. Get some picture of it up.
I'm gonna pop down and do some pricing up and see what they say. I'll get some pictures up of the cables soon to see if anything is wrong. Thanks for your help so far!
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No worries, let us know about the out come!
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Just been up to VW.
They had no idea what that repair kit was, but I gave them the part number and they found it and ordered one for me. They said they had 1 in stock so should be here tomorrow!
Only came to £20 aswell.
They also said its very unlikey to be the ECU which is good news I suppose.
So I'm a little happier now.
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Just had a phonecall from VW and the loom is in already! No 4 week wait for me :drool:. I'll get it fitted tomorrow hopefully and let you know the outcome.
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Just had a phonecall from VW and the loom is in already! No 4 week wait for me :drool:. I'll get it fitted tomorrow hopefully and let you know the outcome.
Lucky bugger :tongue:
Lets hope it cures your problem :afro:
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Me too mate, thanks for your help.