Re: 86 4000S dies after starting...
 

>From: TonyJ tonyjNOSPAM@NOSPAMvisi.com
>
>If the CIS is similar to the 5000 type 44 5cylinders, I would suspect a
>few other things:
>
>- Differential pressure regulator (black thing with wires on front of
>the fuel distributor.
>
>- Vacuum leaks
>
>- ISV Idle stabilization valve and the closed throttle switch for it in
>the throttle body.
>
>- Fuel pump relay getting flaky - jumper to check.
>
>- Check valve in fuel line near tank
>
>- Lining inside tank is flaking off and clogging the fuel pump input screen.
>
>Try pulling the injectors ad seeing if they spray and deliver sufficient
>volume
>
>Tony
>'91 100Q 5spd
>
>Brian McCrary wrote:
>> Hello,
>>
>> I have an '86 Audi 4000S with the 1.8l/CIS-E engine. Recently it started
>> losing power and about a couple of days later it got to the point where it
>> would not keep running. It will start if it has been sitting for awhile,
>> but then it dies. If I restart it, it will die again quicker, and then
>> the third time it won't start at all unless it's been sitting again for a
>> long time. I replaced both fuel filters, and the fuel pump seems to be
>> running fine. I took out an injector and it is spraying some fuel when
>> the engine is started, but I guess it's not enough. I have check all
>> hoses going into the fuel distributor and can't seem to find a problem.
>> I'm guessing it might be a fuel pump, but was wondering if anyone has had
>> this problem in the past, or knows of a better way to make sure it's the
>> fuel pump before forking over a lot for a new one. Any help would be
>> appreciated!
>>
>> Brian
>

Yes what Tony said, but also did you recently remove the Fuel Injection Fuse in
the fuse box usually located in an "unmarked" position. I have seen this stump
many a mechanic. It kinda looks like a spare fuse but it isn't!!
Also check the ground wiring at the cold start valve bolts to make sure the
wiring is not broken.

Also check the Coolant Temperature Sensor for the fuel injection.
And make sure the 02 sensor is not causing an overly rich mixture due to a bad
sensor or wiring.

let us know what you find!

later,
dave
Reminder........
Before you criticize someone, you should walk a mile in their shoes. That way,
when you criticize them, you are a mile away from them, and you have their
shoes. Frieda Norris