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Check the MAP sensor. To see if this is the problem, assuming that the Jeep won't start but is turning over, unplug the MAP sensor and then plug it back in. If you can start it now, the MAP sensor needs to be replaced. The MAP sensor is located in the engine compartment, where the firewall meets the body at the top of the engine compartment, on the driver's side. Good luck.

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Q: 1990 Jeep Cherokee Sport that has no spark from the coil and I replaced both module and coil and still doesn't work What could be wrong?
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