SOURCE: Jeep Hesitates. P0303 code
Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.
SOURCE: engine code 95 jeep grand cherokee lerado
12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle. Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.
SOURCE: location of crankshaft position sensor Jeep grand cherokee 1997
left rear of engine block,on transmission bell housing.best way from top under brake booster use a wrench,
SOURCE: where to replace coolant temp sensor for 1998 grand jeep cherokee
Check this image...
...in the Section ZJ-Secc-8D-Ignition-Systems (page 5, fig. 10 and 11).
Good luck.
SOURCE: how to replace the Battery Temperature Sensor
it is located under the battery in the battery tray.
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