'91 200TQ - hard starting (still)

[Ameer Antar]

I'm assuming this not a 20V motor as your in Canada.. While it could be injectors, it could also be the cold-start valve system, especially since it's only giving trouble when it's not warm. You can use a test lamp or multimeter to verify voltage is turning on and off in the CSV wiring harness. If not, it could be a sensor issue, wiring issue or some problem w/ the ECU. If the voltage is getting to it, you should verify if the CSV is actually working. You should be able to disconnect it from the manifold and watch it squirt fuel when you do a cold start. All the procedures are in the Bentley manual. 

You (or your mechanic) can also check the 5 main injectors by pulling (literally) them from the manifold, placing them in a glass jar, and monitoring the spray patterns. To get them to spray, you need to jumper the fuel pump relay connections so the pump runs and then just lift the airflow meter plate up to open the injectors. The injectors should not leak when the air plate is down. Pulling the injectors is easier than putting them back in, but it's really not bad. You may have to get a few injector seals if they're old and cracked when putting them back in, but that should help the motor anyway, cuz cracks cause vacuum leaks and hurt performance. good luck.

-Ameer

---Original Message---
Date: Wed, 11 Feb 2004 12:28:18 -0700
From: Bart Oleksy <barto at nait.ab.ca>
Subject: '91 200TQ - hard starting (still)
To: quattro at audifans.com
Message-ID: <402A8252.9080305 at nait.ab.ca>
Content-Type: text/plain; charset=us-ascii; format=flowed

This has been an ongoing problem for quite a while now, where the car 
will start like a shot if you just turned it off, but the longer it 
sits, the longer it takes to start.  It turns over just fine, but take a 
while to 'catch', and will stall if I don't keep giving it gas.  After 
about a minute, it's completely fine and drives nicely.

The fuel pump check-valve has been replaced and I've even had the 
(noisy) old fuel pump replaced with a new one.

What other things should be checked as possible culprits?  One mechanic 
had me trying a 'better quality' of gasoline (from Petro-Canada vs. 
Husky or the grocery store stations) but there's been no difference 
since I switched over 2 months ago either.  another suggestion was 
something to do with the injectors, and a different mechanic thought the 
spark plug gaps should be checked, although I expect that won't be the 
problem somehow.

I'd appreciate any ideas you people might have on this for the next time 
I bring it in...thanks!

Bart
'91 200TQ
'86 CGT



------------------------------