My 2001 gmc jimmy will turn over keeps turning but wont catch. the shop put a new battery, ignition distributor cap and replaced rotor, and ignition pick up coils. it worked when i took it home but the next day wouldn't start i brought it back now they say it is the fuel pump. we got it started again and drove it home. PLEASE HELP ME THANK YOU
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Re: 2001 gmc jimmy not starting
Did they do a fuel pressure pressure test to determine that its fuel pump? And if so what was the p.s.i.?It should be around 55 to 60 p.s.i. a few pounds under 55 p.s.i. Pump needs replaced, Your shop should have chk. this when it was there the first time. Did they by chance chg. the fuel filter, that can hinder it from starting too.
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check for spark at the plugs then check for fuel. if one of these are missing the car won`t start. common problem on some of these was the ignition module in the distributor and sometimes the pickup coil wires would break. another thing to check is the distributor cap and rotor for damage like a cracked cap or burnt through rotor. fuel pump were also common.
The starter relay may have a bad connection, this is where your battery connects, and a power wire runs to the starter, also these have a ignition wire which is approx 14-16 gauge wire. The relay could be cracked or the contacts inside are going bad. But the other is the neutral safety switch that you mention. I would check these first.
Since it is moisture related I would suspect the ignition system. My F150 pickup started running poorly and on a hunch I replace the plug wires, the distributor cap and plugs. It made all the difference in the world