Simple question I have a 91 yj 4.0 fuel injection that sometimes don't wanna start.... It turns over but doesn't wanna fire up.... I gotta sit for like 5 minutes the. If fires right up.... Go figure.... Any ideas?
jeep dont wanna start sometimes....
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With it "cold", find the testing port on the fuel rail (Schrader valve) and push in the pin. It should spray fuel. If not, it's likely a worn out fuel pump letting the fuel drain back into the tank. Nothing else comes to mind at the moment.
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Fwiw, the ECU is almost never the problem. Those things last forever.
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Fwiw, the ECU is almost never the problem. Those things last forever.Mine did something similar and it was the ECU. So did wrangler13's. ECU is really easy to swap and they are usually only 20 bucks or so at a yard. Pull it from a non OBD2 cherokee without the security package. Cake.
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Mine did something similar and it was the ECU. So did wrangler13's. ECU is really easy to swap and they are usually only 20 bucks or so at a yard. Pull it from a non OBD2 cherokee without the security package. Cake.
91-95 ODB1 years. New they are around $200
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Take note on times it doesnt start, does the check engine light come on and can you hear the fuel pump run? There is an auto shut down circuit too. Make sure the relay is good by switching it with the horn relay.
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