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Old 05-17-2011, 08:01 PM   #1
Join Date: Jul 2010
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Jeep turns over but doesn't start??help...

i have a 91 4.o jeep yj turns over but doesn't start? changed all plugs wires cap and rotor even the crank sensor.. could it be the fuel pump? i do hear the pump turn on though? is there any way to check it? im no mechanaic by any means though.. any suggestion guys??

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Old 05-17-2011, 08:15 PM   #2
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There should be a Schrader valve on the fuel rail, the fuel lines going to the injectors. You can put a gauge on there to see what the pressure is or you can take the cap off of it and poke the valve core (like a tire valve) with a key or small screwdriver. BE CAREFUL!!! If your pump is working it will have about 40 psi in the line and can squirt on you. Please put on some protective eyeware before you do it that way. You should test this a couple of times by bleeding the pressure, then cycling the key to build fuel pressure again, and then bleeding the valve again. You can also use the small or medium sized screwdriver to check for spark by pulling a plug wire and putting the metal end in the boot, making contact with the metal. Then place the screwdriver close to, but not touching (+- 1/8"), a GROUNDED metal object. Have someone turn the key while you check for spark. Let us know what you find.

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Old 05-18-2011, 12:58 PM   #3
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thank pos yj im going out there now to try it.. ill keep you updated..regards
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Old 05-18-2011, 01:18 PM   #4
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Old 05-19-2011, 01:15 AM   #5
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Don't have the valve he was talking about so this weekend I'm having my neighbor come over to take a look at it.
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