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Old 04-08-2014, 12:43 AM   #4
rickpilgrim
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Join Date: Apr 2011
Location: Wausau, WI
Posts: 591
Re: '89 C3500 TPI 7.4 Injector Problem

Oil pressure sender is also wired into the inj circuit, meaning no oil psi = no fuel injected. If the sender is bad it will start and then when you let go of the key quit as the ECM doesn't see oil psi. And if that doesn't help then it's scanner/0 scope time at our shop. Btw are all the grounds good and connections clean and tight on the wiring? Did you check the key on not running fuel psi? Or even the crankshaft position sensor? All of these things can cause this problem
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