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General => The garage => Topic started by: mk4 nutter on 10 April 2010, 11:15

Title: Mk4 gttdi compression test results ( help )
Post by: mk4 nutter on 10 April 2010, 11:15

Recent to my last post about gttdi 110 smoking I have now done a compression test and the results are........

Dry  1st cylinder 30 bar/440psi   2nd cylinder 22 bar/320psi   3rd cylinder 23 bar/340psi   4th cylinder 29 bar/420psi

wet 1st cylinder 36 bar/520psi   2nd cylinder 29 bar/420psi   3rd cylinder 29 bar/420psi   4th cylinder 36 bar/520psi

So could the deviation in the cylinders be causing it to smoke and run rough or is it still in tolerance and should i look

at getting the injectors and pump checked ???????

Mark

Title: Re: Mk4 gttdi compression test results ( help )
Post by: danny_p on 10 April 2010, 20:38

not massivly exprianced with these engines but That much differancei shoudl think should be a cuse for concirn

Title: Re: Mk4 gttdi compression test results ( help )
Post by: Wayne on 10 April 2010, 20:46

Yep not looking good with that much difference.

Title: Re: Mk4 gttdi compression test results ( help )
Post by: mk4 nutter on 12 April 2010, 09:37

Bump  :smiley:

Title: Re: Mk4 gttdi compression test results ( help )
Post by: mk4 nutter on 12 April 2010, 20:03

Today i spoke to a very reputable diesel specialist, and they said im barking down the wrong tree with the compression as the cause of the smoking,

They are 99% sure it is diesel timing related so today i have swopped the injectors and pump over and still the same !!!! but what whent through my mind

is that somthing has slipped has any one had any issues with this problem ?????

Title: Re: Mk4 gttdi compression test results ( help )
Post by: Adam on 12 April 2010, 21:40

Boost leak
Injector loom (Mainly inj.1)
Faulty VNT

Title: Re: Mk4 gttdi compression test results ( help )
Post by: mk4 nutter on 12 April 2010, 22:38

Hi Adam, if it was boost leak would it not be black smoke ?? its white stinks of diesel and burns your eyes ! iv changed all injectors, any thoughts.

Mark

Title: Re: Mk4 gttdi compression test results ( help )
Post by: Wayne on 12 April 2010, 23:31

Your compression figures are all over the shop, that needs looking at as a 1st step.

Title: Re: Mk4 gttdi compression test results ( help )
Post by: Adam on 13 April 2010, 14:11

Boost leak would be black smoke due to the unburnt diesel so saying it stinks of diesel and being white is a bit weird.

Are you using any oil or water? Headgasket?

Have you had a look at the injector looms? Can you get it checked for error codes using VAG-COM then maybe do some logs on the injectors. 

Title: Re: Mk4 gttdi compression test results ( help )
Post by: mk4 nutter on 13 April 2010, 22:47

Thanks for all the replys guys problem found  :sad: 2 bent conrods thrust washers in the sump pan not a good sign ! big ends ok but mains have gone.

So looks like i need an engine anyone got one code ahf ?

Title: Re: Mk4 gttdi compression test results ( help )
Post by: AudiA8Quattro on 18 April 2010, 19:44

Quote from: Wayne on 12 April 2010, 23:31

Your compression figures are all over the shop, that needs looking at as a 1st step.

+1
Run another test, the cylinders shouldn't differ that much.

Title: Re: Mk4 gttdi compression test results ( help )
Post by: Adam on 20 April 2010, 18:42

Quote from: AudiA8Quattro on 18 April 2010, 19:44

Quote from: Wayne on 12 April 2010, 23:31

Your compression figures are all over the shop, that needs looking at as a 1st step.

+1
Run another test, the cylinders shouldn't differ that much.

.............

Quote from: mk4 nutter on 13 April 2010, 22:47

Thanks for all the replys guys problem found  :sad: 2 bent conrods thrust washers in the sump pan not a good sign ! big ends ok but mains have gone.

So looks like i need an engine anyone got one code ahf ?