Running probs

vag80 · 29-07-09, 07:08 PM

i had a phone call tonight from a mate who is having problems with his B4 80 it is a 2.0
ABK engine it runs rough at idle until you unplug the maf sensor then runs ok so he's fitted a new one it's no better he's also said that he can't set up the timing as the mark are jumping all over the place,i've told him a few things to look at has anyone got any ideas as to wot the problem could be any info would be welcomed (the head has just been rebuilt)

amanda · 29-07-09, 07:11 PM

Hmmmmm are all breather hoses connected properly?

sam · 29-07-09, 07:12 PM

timing belt a tooth out?

vag80 · 29-07-09, 07:16 PM

Quote:

Originally Posted by sam

timing belt a tooth out?

i've be told all the marks line up as they should,it runs ok when the maf is disconected but the timing marks on the flywheel jump all over the place

vag80 · 29-07-09, 07:18 PM

Quote:

Originally Posted by amanda

Hmmmmm are all breather hoses connected properly?

from wot i've been told they are all fitted correctly,i can't go and look at the car as he lives near Bromsgrove

sam · 29-07-09, 07:27 PM

does the mark steady itself out when its rev'd? as i think thats normal

vag80 · 29-07-09, 07:36 PM

that i'm not 100% sure, but it's not right as you should be able to set the timing with it idling with a strobe light which he can't as the marks are jumping alover the place

kully · 29-07-09, 08:14 PM

There is a relay under the drivers side of the lower section of the dash, you have to remove the tray, there is a relay which controlls the ecu has a no 6 on it I think. This relay costs £10 from audi, We changed the cat, lamba sensor, distibuter, leads, all sensors, all genuine parts and the car still played up untill this cheap relay was changed.

vag80 · 29-07-09, 08:23 PM

cheers mate i will tell him

rsk289 · 30-07-09, 06:33 AM

Try putting a jump lead between the body of the lambda probe and a good earth and see if there is any difference in the idle. Sensibly positioned you can make/break the connection whilst the engine is running and compare the idle. My father had similar symptoms on his coupe and this improved it. Basically lambda probe not earthing due to corrosion.

29-07-09, 07:11 PM	#2
amanda quattro hussie!! Classic Audi Club Member Join Date: Jul 2007 Location: doin' it on all fours!! Posts: 5,993	Hmmmmm are all breather hoses connected properly? __________________ Mystic blue m3 ghay hairdresser mobile 4 sheds 1 shopping trolley Gti RS6 ...my baby

29-07-09, 07:36 PM	#7
vag80 Senior Member Classic Audi Club Member Join Date: Oct 2008 Location: Bracknell Posts: 1,967	that i'm not 100% sure, but it's not right as you should be able to set the timing with it idling with a strobe light which he can't as the marks are jumping alover the place __________________ nothing like a bit of deep dish 200k club member 87-b3 80 83-4000 2 door

29-07-09, 08:23 PM	#9
vag80 Senior Member Classic Audi Club Member Join Date: Oct 2008 Location: Bracknell Posts: 1,967	cheers mate i will tell him __________________ nothing like a bit of deep dish 200k club member 87-b3 80 83-4000 2 door

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29-07-09, 07:12 PM	#3
sam Grown up member Classic Audi Club Member Join Date: May 2008 Location: North east Posts: 778	timing belt a tooth out?

29-07-09, 07:27 PM	#6
sam Grown up member Classic Audi Club Member Join Date: May 2008 Location: North east Posts: 778	does the mark steady itself out when its rev'd? as i think thats normal

29-07-09, 08:14 PM	#8
kully Grown up member Classic Audi Club Member Join Date: Aug 2008 Location: Walsall Posts: 942	There is a relay under the drivers side of the lower section of the dash, you have to remove the tray, there is a relay which controlls the ecu has a no 6 on it I think. This relay costs £10 from audi, We changed the cat, lamba sensor, distibuter, leads, all sensors, all genuine parts and the car still played up untill this cheap relay was changed.

30-07-09, 06:33 AM	#10
rsk289 Grown up member Classic Audi Club Member Join Date: Jan 2008 Location: Clevedon Posts: 50	Try putting a jump lead between the body of the lambda probe and a good earth and see if there is any difference in the idle. Sensibly positioned you can make/break the connection whilst the engine is running and compare the idle. My father had similar symptoms on his coupe and this improved it. Basically lambda probe not earthing due to corrosion.