engine spins over no crank
#1
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Model: Cherokee
Engine: inline 6
engine spins over no crank
i have a 99 cherokee that a "friend who knows everything" changed out the engine for me. it cranked before in the 96 but not now in the 99. i have no power from the coil. does the plug to the coil supposed to have power when cranking and are there fuses that control this. please help.as
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Model: Cherokee
Engine: inline 6
spins no crank
i spoke with a tech at my local dealership and he steered me towards the crankshaft position sensor and connector. apparently if the computer sees no cps its as dumb as a rock. sure enuf the wire was cut. repaired the wire and check eng light came back on. still no crank but i am making progress. the tech was more than helpful, i havent gone back yet as i am reluctant to bother these guys for free information without some previous effort on my part to solve the problem.
#4
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Year: 1999
Model: Cherokee
Engine: 4.0
The strategy for a no-start is always the same.
Job #1 is to verify spark. Pull a plug, keep it attached to the plug wire, place the plug electrode near a good engine ground, have a buddy crank the engine while you watch.
You are looking for a strong, BLUE, snapping spark. Yellow/orange/white indicates a weak spark, which may not be strong enough to start the engine.
If spark checks out, spray a small amount of starting fluid into the intake. If the engine starts and runs for a bit using this technique, you have identified a fuel delivery problem.
The above two procedures take only a few minutes and will help you isolate the "root cause" of your problem.
Good luck and let us know what you find!
Job #1 is to verify spark. Pull a plug, keep it attached to the plug wire, place the plug electrode near a good engine ground, have a buddy crank the engine while you watch.
You are looking for a strong, BLUE, snapping spark. Yellow/orange/white indicates a weak spark, which may not be strong enough to start the engine.
If spark checks out, spray a small amount of starting fluid into the intake. If the engine starts and runs for a bit using this technique, you have identified a fuel delivery problem.
The above two procedures take only a few minutes and will help you isolate the "root cause" of your problem.
Good luck and let us know what you find!
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