Question about 2000 Jeep Grand Cherokee

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My jeep won't start!

My jeep won't start. Put a brand new battery in, the alternator and the starter is good. Put a new fuel pump in and replaced the sparkplugs and it still won't start. It sounded like it want to start but it won't.

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Try your nuetral safety switcdh. they're really not that much $$$$$$ i had that ongoing problem and it ended up being that.

Posted on Aug 11, 2008

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Why will it crank but won`t turn over?


Have you checked for correct fuel pressure? Most parts stores have a loan-a-tool fuel pressure gauge kit, and if you remove the plastic engine cover you will find a fuel rail port to attach the tester. Just because you replaced with new pump, don't assume it is good. Many cheap aftermarket pumps are noisy and fail often.

If pressure is good, insure you have spark to the plugs.

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My car won't start. The battery is good and the starter is doing it's job. The fuel filter has been replaced. The car will start with starter fluid and run when revved but won't start o


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My 1995 jeep grand cherokee Laredo won't start, or


You might not believe this, but check your battery. Some of these vehicles have cut-outs when the battery level goes below a preset amount.
I work on Ford brands and on them, a low battery level will even disconnect the Alternator circuit and mess with the starter. Some even act up when the battery slightly dips below 12 volts.

Your antitheft can make your starter cut out. And If you think about it, all of the measurements to make the engine run are based on feedback of voltage and amperage. This is how the engine management system adjusts. If your prime source of power is low, then all of the following electrical readings will be low. Some may be too low to work.

Your fuelpump will hold pressure in a closed system for hours. The fuel pressure regulator will command the fuelpump to stop working if the fuel pressure is at maximum. Without responses from the other components and after satisfactory pressure, the fuelpump will turn off.

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The Jeep DTC P1491 code is actually radiator fan control relay circuit.
Soft reset if the battery disconnect would have erased the code; the first thing I would replace for that code (fan relay).
Additionally, its possible thta your THEFT system is activated, check owners manual to disarm.
Hope this helps.

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