cis residua; pressure

[Ameer Antar]

Residual pressure testing according to the Bentley is after 10 and 20 mins. I couldn't find anything after that, and 12 hours is too long for the system to hold any real pressure I don't think this is your problem. I would take a REAL close look at your intake hoses and other vac. hoses, especially on the underside and near the hose clamps, b/c cracks usually never stare at you in the face.

One test you might do is to remove the air filter and when the engine is idling rough, try lifting or lowering the airflow plate (you may need 2 people if it dies too quick). This will adjust the fuel mixture and if that's the issue, you should be able to get it to run smooth. If you still suspect leaky or bad injectors, you can pull the injectors from the head and let them spray into a glass jar. If you jumper the fuel pump relay and lift the airflow plate, fuel should get to the injectors and you can see if there's any leak when the airflow plate is down and if there's any bad spray patterns when you raise it. Further fuel system troubleshooting will probably require a CIS fuel pressure kit. (You're best bet is JCW for that). I'd also double check the idle switch and wiring, clean up the ignition system and connections. Then you might need to start confirming all the engine sensors are up to spec. Looks like you have some work to do. ;) Good luck.

-Ameer

---Original Message---
Date: Sun, 01 Feb 2004 16:28:12 -0500
From: "Brendan Walsh" <bkwalsh4201 at hotmail.com>
Subject: cis residua; pressure
To: quattro at audifans.com
Message-ID: <Law11-F96T6bB5Rw1SS000022b7 at hotmail.com>
Content-Type: text/plain; format=flowed

Should be an easy one..
After another unsuccessful attempt to get the coupe to start and idle on 
it's own. i got the bright idea to see if there was any residual pressure 
left in the system after apporx 12hrs. answer-none. Question is should there 
be and of so how much? I would think some which leads me to believe i need 
new injectors or the fpr need adjusting since the fuel pump and check valve 
are new.
The car would start on it's own very shortly after running, ie 1-2 minutes. 
after that it needed a shot of carb cleaner to get going again and still no 
idle. I'm going to try and switch bak to the original distributor and air 
plate from the cis sys when i do the new injectors. I'll need to locate a 
set of fuel lines from the old sys, any body got one fs?

TIA
Brendan

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