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Model specific boards => Golf mk4 => Topic started by: Wazzzer on 18 June 2010, 22:52

Title: Misfire...(AGU owners help needed)
Post by: Wazzzer on 18 June 2010, 22:52

On my way back home today I noticed the Golf was misfiring...

Now I've done a test on the ignition amp and measured the resistance across the terminals as per this topic

http://forums.audiworld.com/showthread.php?p=1535031

The reading across the terminals was approx 206 ohms on all 4 so not a problem really. I'm thinking it's breaking down when it's hot though as it was quite warm earlier.

Can anyone else test their ignition amp and post up some results? I'm guessing the higher the number the more resistance (not good)

Thanking you

Title: Re: Misfire...(AGU owners help needed)
Post by: Mikemk4 on 18 June 2010, 22:58

Mine does exacly the same, its driving me crazy, i dont know if its the ignition amp getting to hot since i have an induction kit so its removed from the airbox.

Title: Re: Misfire...(AGU owners help needed)
Post by: Wazzzer on 18 June 2010, 23:12

I don't have any fault codes either. My amp has lived on the air box mount for well over 2 years now and never had a problem but it's just started. Might have to bite the bullet and get a new one... Not got a TPS or GSF over here though  :sad:

Title: Re: Misfire...(AGU owners help needed)
Post by: Mikemk4 on 19 June 2010, 07:58

Yeh mine doesnt throw up any fault codes either, have you got a mate with the same engine and you can swap amps? . .

Title: Re: Misfire...(AGU owners help needed)
Post by: linz on 19 June 2010, 09:56

are you sure thats the problem? when mine had a slight misfire it was down to coilpacks

Title: Re: Misfire...(AGU owners help needed)
Post by: Mikemk4 on 19 June 2010, 11:09

Its usually the AUM coilpacks that go . . unusual on a AGU

Title: Re: Misfire...(AGU owners help needed)
Post by: Wurzel on 19 June 2010, 11:21

My non-turbo had a misfire recently, bought a £20 coilpack on ebay and now it runs like new.

Title: Re: Misfire...(AGU owners help needed)
Post by: Wazzzer on 19 June 2010, 12:37

you don't have ignition amp  :wink:

Title: Re: Misfire...(AGU owners help needed)
Post by: Purely VAG on 19 June 2010, 14:18

No fault codes rules out the coilpacks. The ignition amp uses a heat sink, silver plate on back of it.

Its going to be the amp getting too hot. You could try re-use the amp you have, buy some heatsink paste to apply to back of it and make sure plate is still on back on it onto airbox.

You may have to replace it though. I know i have at least 1 in garage or buy a new one.

Title: Re: Misfire...(AGU owners help needed)
Post by: Wazzzer on 19 June 2010, 19:29

I still run the heatsink to give it some chance of cooling down. Will take it off and reseat it with some paste and see how I go

Tested a mates ignition amp today and got a reading of approx 270 on all the terminals, got another mate with one that I'll test too and see what happens

Title: Re: Misfire...(AGU owners help needed)
Post by: topher on 19 June 2010, 19:59

no fault codes doesn't necessarily rule out the coil packs

does it do it at idle?

was your mate not brave enough to swap ignition amps with you in the cause of diagnostics? :grin:

Title: Re: Misfire...(AGU owners help needed)
Post by: Wazzzer on 20 June 2010, 09:04

thing is it only does it now and then, it was at idle too...