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Author Topic: 1.8T AUM misfire when cold  (Read 2777 times)

Offline rs_dude

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1.8T AUM misfire when cold
« on: 24 August 2011, 12:49 »
I have a MK4 Golf 1.8T (AUM) which seems to misfire on light throttle when cold.

It has had 4 new coilpacks from VW under re-call. Maf was recently replaced, again OEM.

The car is 'Stage 2' mapped by AMD.

It does not bring up any management lights or codes, any ideas?
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Offline RTechUK

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Re: 1.8T AUM misfire when cold
« Reply #1 on: 24 August 2011, 19:35 »
Air leak or issues with SAI?
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Offline rs_dude

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Re: 1.8T AUM misfire when cold
« Reply #2 on: 25 August 2011, 11:47 »
The SAI isn't connected to the airbox as i have an aftermarket enclosed filter, could this be the problem?

I did check the catch tank and FMIC/boost hoses for leaks, all seems fine.

Thanks for the reply!
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Offline richw911

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Re: 1.8T AUM misfire when cold
« Reply #3 on: 29 August 2011, 21:58 »
Secondary air pump fault?
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Offline Wayne

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Re: 1.8T AUM misfire when cold
« Reply #4 on: 29 August 2011, 23:08 »
Quote from: rs_dude on 25 August 2011, 11:47

The SAI isn't connected to the airbox as i have an aftermarket enclosed filter, could this be the problem?


Yes it could well be the problem :smiley:
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Offline rs_dude

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Re: 1.8T AUM misfire when cold
« Reply #5 on: 30 August 2011, 15:00 »
Thank you for the replies.

I'll have to find a way to connect it to my air filter!
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