Audi 100 2.0e poor running issue

Peterpoohjones · 25-10-17, 09:23 PM

Hi all,
I'm after some tech advice. I have a 1989 100 2.0e that's always been brilliant but just recently it's running terrible.
Starts fine and then the revs surge from 750 to 2000 rpm until warm then it idles poorly at 750. It's not really drivable. Its like a car running with the choke out or on 4 cylinders, missing and hesitating.
It's also has a lot of condensation comes out of the exhaust.

I've done a compression test 180 acrosss all 5. So pretty good for a car with 160k on the clock.
New spark plugs cap and rotor.
When I took the plugs out today plugs from 2 and 3 were soaking wet.

Is it possible the cold start injector is at fault and stuck open?

Any advice or previous experience would be appreciated.

Cheers

sinbin5t · 25-10-17, 09:33 PM

Quote:

Originally Posted by Peterpoohjones

Is it possible the cold start injector is at fault and stuck open?

Unplug it if you can and see what happens.

Peterpoohjones · 25-10-17, 09:35 PM

I have tried and it mAkes no different annoyingly, still surges and runs poorly.
Can they stick open?

msh · 26-10-17, 09:55 AM

Theoretically.

I would suggest you to start with temp sender test, as, I guess, it's RT engine with KE-jet, not K-jet. Just get yourself some multimeter and measure resistance of both sides of it, and compare it against the graph and both sides against each other. Or, if you prefer to change everything, until maybe problem is gone, then you can change it without testing

Peterpoohjones · 26-10-17, 11:56 AM

Thanks for this I’ve give it a try. Can you give me some direction to which temperature sensor it is? I see there’s a brown one at the back of the cylinder head and two on the thermostat housing, one a small single terminal the other a large three wired type.
Cheers
Peter .

Peterpoohjones · 28-10-17, 01:48 PM

Well I've fixed my issue. I was doing some more diagnosis this week and as it was starting to go dark I noticed lots of sparks coming from HT leads.

A new set of quality leads and she's running let's a rocket! Lesson learnt always start simple first.

P

urquattr085 · 28-10-17, 01:57 PM

often the simple things.....

sinbin5t · 28-10-17, 03:05 PM

Result

Alburglar · 28-10-17, 07:02 PM

I figured that out once...
...with a zap straight up my arm!
...wee came out.

28-10-17, 01:57 PM	#7
urquattr085 Senior Member Classic Audi Club Member Join Date: May 2016 Location: Displaced Northerner in Essex Posts: 1,528	often the simple things..... __________________ 1985 WR quattro 2010 A6 3.0Tdi Allroad 2010 A3 1.4 tfsi Sport - Sold but still in the family 1984 80 Quattro - Sold many moons ago 1981 Coupe GT - Sold to buy above

25-10-17, 09:35 PM	#3
Peterpoohjones Newbie! Join Date: Oct 2017 Posts: 4	I have tried and it mAkes no different annoyingly, still surges and runs poorly. Can they stick open?

26-10-17, 09:55 AM	#4
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	Theoretically. I would suggest you to start with temp sender test, as, I guess, it's RT engine with KE-jet, not K-jet. Just get yourself some multimeter and measure resistance of both sides of it, and compare it against the graph and both sides against each other. Or, if you prefer to change everything, until maybe problem is gone, then you can change it without testing

26-10-17, 11:56 AM	#5
Peterpoohjones Newbie! Join Date: Oct 2017 Posts: 4	Thanks for this I’ve give it a try. Can you give me some direction to which temperature sensor it is? I see there’s a brown one at the back of the cylinder head and two on the thermostat housing, one a small single terminal the other a large three wired type. Cheers Peter .

28-10-17, 01:48 PM	#6
Peterpoohjones Newbie! Join Date: Oct 2017 Posts: 4	Well I've fixed my issue. I was doing some more diagnosis this week and as it was starting to go dark I noticed lots of sparks coming from HT leads. A new set of quality leads and she's running let's a rocket! Lesson learnt always start simple first. P

28-10-17, 03:05 PM	#8
sinbin5t 4 ring whore! Classic Audi Club Member Join Date: Jan 2010 Location: Where a spike points skywards Posts: 12,960	Result

28-10-17, 07:02 PM	#9
Alburglar Grown up member Join Date: Sep 2017 Location: Dover, Kent Posts: 270	I figured that out once... ...with a zap straight up my arm! ...wee came out.