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Re: 95 dodge caravan with no start problem.
Connect a timing light to the number one plug wire and crank the engine. Does the light flash indicating that the Number one is firing? Look at the distributor. If you have a distributor cap and rotor assembly remove the distributor cap and crank the engine. If the rotor turns check the rotor to make sure there is a good contact point and check the distributor cap to ensure there are good contacts. If either is damaged or worn replace them both. If the rotor does not turn you have a broken timing belt or one of the timing belt/chain guides has jammed and the engine needs to be rebuilt.
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Could be a bad coil, bad Ignition Control Module (what controls the ignition coil as commanded by the engine computer), or a bad crank position sensor, or cam position sensor. Or the wiring and circuits to all the ignition parts.
Often it is the crank sensor (CKP sensor)-The pcm must have this information from the crank sensor to determine spark timing. If no good signal from the crank sensor, there will be no spark.
Make sure battery has a full charge and battery connections all good.
If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
If you having a problem with more than one system, I want to check for rpm signal, that usually comes from the crank sensor. Not sure why you replaced cam sensor? I always want to check sensor wiring circuits before replacing anything. Don't replace anything unless your testing points in that direction.
What make vehicle ? year an model too ! Before you replaced those parts did you check for battery supply voltage an check the ground for those components ? You need to get a wiring diagram an see what get's voltage an what is ground ! An see what all is involved , crankshaft position sensor , ECM / PCM -engine computer etc...! Then you need a DVOM - digital volt ohm meter to test ! Your looking for a quick fix an doesn't work like that !
No spark? Then there is probably no signal to trigger the spark. Possible causes:
1) Cam position sensor.
2) Crank position sensor (you replaced it)
3) Coils (already replaced)
3) Wiring and connections to and from coils (bad grounding points or bad live feeds)
Suggestion: Stop the guessing and spending with "probable" causes. Have the car scannned for error codes and start from scratch according to error codes.
Pull off the coil ignition cable at the distributor and check for spark coming out of coil when cranking engine over. Use a heavy rag or glove to hold the wire 1/4 inch from a metal ground. Should see a strong blue spark when cranking to verify ignition is good. If no spark, check for battery voltage to coil on the coil primary. If you have current to the coil, suspect a bad coil, ignition module, crank position sensor, or cam position sensor, or pcm. The coil, ignition module, and sensors can be tested before replacing.
It is on the front of the motor just under the rear part of the waterpump in the timing cover. But I doubt it is the problem. Sounds more like a bad crank sensor. Which is located behind the crank pulley.