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General => The garage => Topic started by: rs_dude on 24 August 2011, 12:49

Title: 1.8T AUM misfire when cold
Post by: rs_dude 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?

Title: Re: 1.8T AUM misfire when cold
Post by: RTechUK on 24 August 2011, 19:35

Air leak or issues with SAI?

Title: Re: 1.8T AUM misfire when cold
Post by: 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?

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

Thanks for the reply!

Title: Re: 1.8T AUM misfire when cold
Post by: richw911 on 29 August 2011, 21:58

Secondary air pump fault?

Title: Re: 1.8T AUM misfire when cold
Post by: Wayne 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:

Title: Re: 1.8T AUM misfire when cold
Post by: rs_dude 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!