2.3 KV engine start problems.'91 Audi Coupe

Flying Frank · 14-11-14, 05:00 PM

Have been trying to resolve this starting issue for a month or more now.

Problem is : FIRST start of the day , engage starter, engine fires and then..... IF the throttle is so much as dabbed, the engine stalls and will not re-start for a while ( flooded ? ) If the accelerator is not touched, the engine shudders along at about 450rpm , just "chugging" and if left , the accelerator may be VERY gently tickled/dabbed AFTER about 30 seconds.
Revs rise about 100rpm ....then after a few more dabs and by now about 50 seconds, the engine can be very gingerly accelerated up to about 1500rpm.....

After which there are no further starting issues for the rest of the day.

Have changed cold start valve and idle control valve plus both temperature senders on the block.( at least the water temp gauge works now! )

Running out of ideas.

Any ideas gratefully received.

PLEASE NOTE!!! My mistake, the engine is a NG code

Martc · 14-11-14, 05:06 PM

I have the exact same issue on my other CQ, which is in a very long list of things to do.

I am not one for replacing random parts, but I had a hunch it was the warm up regulator not working when cold so not getting enough fuel.

Take a look here from Mr Paynes site it might help.....

http://www.isham-research.co.uk/quattro/pressure.html

jamiecoysh · 14-11-14, 05:47 PM

metering head/fuel distributor fault

Flying Frank · 14-11-14, 05:49 PM

Quote:

Originally Posted by jamiecoysh

metering head/fuel distributor fault

that's the big expensive bit isn't it?

John. · 14-11-14, 05:57 PM

You say 2.3 KV ??

Is it not a 2.2 KV or a 2.3 NG

jamiecoysh · 14-11-14, 06:07 PM

yeah it is the big expensive part

I had an 90 2.3e which had the same problem although it did it pretty much everytime it started.

Flying Frank · 14-11-14, 07:36 PM

Quote:

Originally Posted by John.

You say 2.3 KV ??

Is it not a 2.2 KV or a 2.3 NG

John, you are right and my apologies...it IS a 2.3NG !!! Getting my '85 cq mixed up with the '91 coupe.

John. · 14-11-14, 07:44 PM

Quote:

Originally Posted by Flying Frank

...it IS a 2.3NG !!! Getting my '85 cq mixed up with the '91 coupe.

That's not getting mixed up...that's showing off !

Have you checked the HT electrics? Ok it is probably an air/fueling issue but wouldn't do any harm to check dizzy cap and clean any crap from around the coil tower?........maybe check the resistance of the leads?

audizzz · 14-11-14, 07:46 PM

This same problem has been experienced by other 2.3 audi owners including myself, we also replaced cold start valve, didn't work and after weeks of searching, it was fuel filters, there are hidden ones!!!!!!
Car had stood a while, fuel dropped quite low and pump manages to suck up and force through detritus from the tank. After thorough cleaning from the pump forwards, problem solved.

Somebody else on here may be able to locate other thread, worth a read.

Flying Frank · 14-11-14, 07:52 PM

Definitely not showing off, there are too many seriously well informed guys on this forum with cars that are to dream of. My humble Coupe is supposed to be the daily driver but is driving me a bit crazy with the list of "snags" that never seems to get sorted.

Will give your suggestions a try tomorrow , weather permitting!!

14-11-14, 05:06 PM	#2
Martc Black Coupe Collector Classic Audi Club Member Join Date: Feb 2008 Location: Towcestershiresheer Posts: 2,934	I have the exact same issue on my other CQ, which is in a very long list of things to do. I am not one for replacing random parts, but I had a hunch it was the warm up regulator not working when cold so not getting enough fuel. Take a look here from Mr Paynes site it might help..... http://www.isham-research.co.uk/quattro/pressure.html __________________ 95 UrS6 87 Coupe Quattro

14-11-14, 05:47 PM	#3
jamiecoysh Grown up member Join Date: May 2013 Location: Torquay, Devon Posts: 119	metering head/fuel distributor fault

14-11-14, 05:57 PM	#5
John. 4 ring whore! Classic Audi Club Member Join Date: Mar 2011 Location: Scottish Borders. Posts: 7,539	You say 2.3 KV ?? Is it not a 2.2 KV or a 2.3 NG

14-11-14, 06:07 PM	#6
jamiecoysh Grown up member Join Date: May 2013 Location: Torquay, Devon Posts: 119	yeah it is the big expensive part I had an 90 2.3e which had the same problem although it did it pretty much everytime it started.

14-11-14, 07:46 PM	#9
audizzz Grown up member Classic Audi Club Member Join Date: Nov 2013 Posts: 125	This same problem has been experienced by other 2.3 audi owners including myself, we also replaced cold start valve, didn't work and after weeks of searching, it was fuel filters, there are hidden ones!!!!!! Car had stood a while, fuel dropped quite low and pump manages to suck up and force through detritus from the tank. After thorough cleaning from the pump forwards, problem solved. Somebody else on here may be able to locate other thread, worth a read.

14-11-14, 07:52 PM	#10
Flying Frank 4 ring whore! Classic Audi Club Member Join Date: Dec 2012 Location: Kernow, Gods own county !! Posts: 2,388	Definitely not showing off, there are too many seriously well informed guys on this forum with cars that are to dream of. My humble Coupe is supposed to be the daily driver but is driving me a bit crazy with the list of "snags" that never seems to get sorted. Will give your suggestions a try tomorrow , weather permitting!!