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Model specific boards => Golf mk4 => Topic started by: Kelvin1977 on 05 November 2013, 18:24

Title: Mk4 20v turbo problems
Post by: Kelvin1977 on 05 November 2013, 18:24

Ok I have two faults codes coming up both relating to engine misfires. My car is running like a bag of poo, the coolant has gone from pink to sh!tty brown. No cream on the oil cap at all still head gasket ?

Title: Re: Mk4 20v turbo problems
Post by: dom on 05 November 2013, 19:07

Have you scanned for fault codes?

Title: Re: Mk4 20v turbo problems
Post by: Kelvin1977 on 05 November 2013, 19:19

Yes mate two codes both to do with misfires 16684 and 16685

Title: Re: Mk4 20v turbo problems
Post by: MoshiMoshi on 05 November 2013, 20:07

My coolant is a rusty awful brown colour, suppose the inside of something is rusting away but I'm not massively interested in finding out what. It still works perfectly. I wouldn't jump to the conclusion that the head gasket is gone. I'd say 90% of the misfire in these cars are coil packs or ignition amp related (for AGU). How old are the plugs and coils?

Title: Re: Mk4 20v turbo problems
Post by: Kelvin1977 on 05 November 2013, 20:25

Yeah coil packs need changing and due a service but it's the coolant changing over night that points to head gasket

Title: Re: Mk4 20v turbo problems
Post by: ant_gti on 05 November 2013, 21:15

nope your oil cooler is buggered!!

Title: Re: Mk4 20v turbo problems
Post by: MoshiMoshi on 05 November 2013, 23:03

Quote from: ant_gti on 05 November 2013, 21:15

nope your oil cooler is buggered!!

This. Seemingly a more common fault than head gaskets. Any steam from the exhaust? Does the coolant tank smell of petrol/exhaust vapors after running?

Title: Re: Mk4 20v turbo problems
Post by: Kelvin1977 on 06 November 2013, 06:01

The oil cooler had crossed my mind but would it cause the missing like it is ?

Title: Re: Mk4 20v turbo problems
Post by: ant_gti on 06 November 2013, 09:05

I would defo go with the oil cooler.your misfire as said above is prob due to either coil pack or if it's the agu engine it has an ignition amp on the air box that are also known to play up.

Title: Re: Mk4 20v turbo problems
Post by: budgie on 06 November 2013, 12:16

Quote from: MoshiMoshi on 05 November 2013, 20:07

My coolant is a rusty awful brown colour, suppose the inside of something is rusting away but I'm not massively interested in finding out what. It still works perfectly. I wouldn't jump to the conclusion that the head gasket is gone. I'd say 90% of the misfire in these cars are coil packs or ignition amp related (for AGU). How old are the plugs and coils?

coil packs rarely go on a agu....  i thought that may have been my problem but got it scanned yesterday and coils are fine, waiting on ignition amp now :angry:.. still doesnt explain the brown stuff in there tho.

Title: Re: Mk4 20v turbo problems
Post by: davidgtrr34 on 11 December 2013, 19:44

that brown colour could be coming from the water pump. remove the timing belt cover and start the car, if the water pump pulley is shaking then its knackered

Title: Re: Mk4 20v turbo problems
Post by: Wazzzer on 11 December 2013, 22:19

You'll be very lucky to pull any sort of engine fault code off the AGU, the ignition amp definitely doesn't show up