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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Originally Posted by CFD View Post
Car starts fine when cold, runs ok (perhaps a slight rough idle) but when it reaches the temp where the engine revs should drop to the 950 or so rpm, it suddenly starts over fueling, black smoke out the exhaust and cuts out. I can keep it running by giving it some gas, but its blowing out a lot of black smoke. If I cut engine and try to start it will only fire up when accelerator pressed fully to floor to give max airflow and clear it out.....

I disconnected the cold start injector, but didnt help.

Any ideas, suggestions that I can investigate? Thanks.....
Sounds like you may not be getting any electrical power to the WUR, which is required to heat up the internal element and cause the cold start control pressure to rise after a couple of minutes...thus leaning out the mixture. Your symptoms indicate that the WUR never leaves its cold start mode.

Pull the plug from the WUR, force your pumps to run by either starting the car or unplugging the blue/green plug behind the the fuel distributor head with the key in the on position, and put a voltmeter across the terminals of the plug. You should be able to read voltage there. If I recall, the circuit that controls the voltage to that plug is tied in with the rear fuel pump relay.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 07-19-2011, 02:30 PM
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