Another won't start - 2000 Cherokee 4.0

2000 Jeep Cherokee, 4.0.
For 3 years it's never missed a beat. Never failed to start, always ran like a top.
Parked it at the house the other night, next
morning it cranks but won't fire.

I removed the air snorkel and sprayed some starting fluid in the throttle body. It would
then *sort* of fire - weekly. Not like a brief
rev up like you usually get with ether. Still,
there was some sort of ignition - very brief,
and never after key was released from the start
position.

There's a "test" schrader valve on the fuel rail.
I pressed it and a little fuel came out under some pressure, but less than I expected.

Any theories?

Try banging on the fuel tank while cranking. May have a bad fuel pump.

sounds like a bad fuel pump...check to make sure you got good fuel pressure, with a gauge.

If it cranks but won't fire it could also be the cam and/or crank sensor gone goofy. The engine controller needs to "see" where each (cam & crank) are before it will send fuel to the injectors. IIRC the engine will start and run (not optimally) with a missing cam sensor, but needs to "see" the crank for sure to fire.
Hope it helps!

Very common for crank shaft sensor.

Quote:

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Very common for crank shaft sensor.

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Pretty common issue with the Cherokee 4.0... that would be my bet.