Hey my Jeep turns over but won't start. We changed spark plugs, wires, distributor cap, and rotor buttons, and still the same result (and we verified it was getting electricity and gas), So how do I check the compression (or repair it if that is the problem)? Also when you start the engine, you can hear some pressure release from the engine. Help please!!

Are you getting a spark from the spark plug wire.
Check compression with a compression gage.
Do one cylinder at a time.

CPS (crankshaft position sensor)

Check for spark at the coil first.
If you have no spark then look at the following:
1. Crankshaft position sensor
2. Ingition coil
3. Ignition module (test it at auto parts store)
4. Camshaft position sensor AKA stator or pickup coil (located inside distributor)

Mike

Thanks! I will check these. How do you check the crankshaft position sensor?

Thanks! I will check these. How do you check the crankshaft position sensor?

For Crankshaft position sensor try here: http://www.autozone.com/az/cds/en_us/0900823d/80/15/23/4d/0900823d8015234d/repairInfoPages.htm

For Camshaft sensor here: http://www.autozone.com/az/cds/en_us/0900823d/80/15/23/7e/0900823d8015237e/repairInfoPages.htm

COil and ingnition module: http://www.autozone.com/az/cds/en_us/0900823d/80/15/1b/21/0900823d80151b21/repairInfoPages.htm

Hope this helps.