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Won't stay running 200

posted by  someone claiming to be Thank you, Bruce Young on  Tue Oct 9 10:42 CST 2007 [RELATED]


Jumped the fuel pump like you said and it fired right away. Running fine now?



Off hand, I can't think of anything related to the crank sensor replacement that would cause these symptoms.

If it fires and runs at all, the crank sensor and main Ign and FI fuse (#6) must be OK.

Gas from the Cold Start Injector may be giving it the short initial run—with the CSI getting its gas from the short pump "prime" when the key is first turned on. Does that pump prime happen?

If so, it sounds like the Fuel relay is not getting reenergized as it should during cranking—a different relay energizing control than the one at "key on".

Try bypassing the Fuel relay and run the pumps directly. Connect a +12Volt jumper to the LEFT side contact of fuse #4. The +12V is available (all the time) from the LEFT side of any fuse 6 thru 10.

The pumps will run immediately, so see if it will start then.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.







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