Thread: CIS problem
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mas88s mas88s is offline
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Join Date: Jan 2007
Location: Sassamanville, Pa
Posts: 70
CIS problem

I have been chasing this problem for a while and I need a few suggestions as to how to proceed.
1986 930 K27, Kokeln intercooler rebuilt 8000 miles ago approx 10 years. 58,000mi
Car starts , after about 7-8 seconds goes super lean and stalls unless I baby sit.
After about 3-4 minutes afr's come down and it runs good. Fully warmed up.
Now here is a clue...If I turn the car off and immediately start it, it does the exact same thing, almost to the second. at warm temps.
Things I've done are pressure checks: system, cold and warm...all fine.
Rebuild fuel head....there were pin holes in the main diaphragm ( thought for sure that would help, but it didn't)
Brian rebuilt the WUR
Thought it was a sluggish fuel pump....replaced front and rear.
Also note that it really sucks down the fuel...10mpg's
I was thinking a faulty CSV ? Is that possible?
It doesn't have enough fuel at first 3=4 minutes and then it guzzels it down.
AFR's at warm idle 13.8-14
Possibly 2 problems??
Any thoughts....
Old 07-10-2017, 02:11 PM
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