These are your possible causes

Coil
Crank Angle Sensor (CKP)
Distributor Sync
Powertrain Control Module (PCM)
Wiring Harness

are your injectors pulsing while cranking.

Vehicle Application: 1998 B1500 3.9 1999 Dakota 3.9 1997 Dakota 3.9 1998 Ram 1500 3.9 1998 Dakota 3.9 Customer Concern: No start, no spark

Average Reported Mileage: 133909
Tests/Procedures: 1. Scope the Crankshaft Position (CKP) sensor. The CKP sensor should output a consistent 0-5 volt square wave signal.

2. If it will not act up, try tapping on the CKP sensor, with the engine running, to see if it affects the way the engine is running.

3. Test the power and ground control at the coil with the Automatic Test Mode (ATM) tests during the no start. The power should be constant and the ground will cycle on/off every second during the test.

 

There was a thread posted in another section. I have merged them together.

 

well i have very weak spark coming from coil and it is really weak at the dist cap,,
i took my coil in to part store and was told it was good,,,,well why a low spark

 

Assuming the coil is good then you could have a bad PCM or ASD relay.

The ASD relay feeds the coil, the PCM grounds it.

 

well i put a new cap and rotor on the coil test good but very low spark cant even hardly see the spark at the dist the coil shows some spark but not like it should very week
i was told that even if the coil test good it is good well what else could be the cause of this thanks much everyone

 

Your PCM can be bad. The ASD relay can be bad - corroded contacts.

 

Lets try this again. Forum is not working on iPad.

I'm 1800 miles from my truck, else I would measure ,y coil. Either the primary voltage is too low, or the windings have failed and the resistances and inductances are not ideal for voltage amplification.

 

Do you have an ohm meter? If so, check your coil. There are two manufacturers:

Diamond. Primary resistance: 0.97-1.18 ohms. Secondary: 11,300-15,300 ohms.
Toyodenso. Primary resistance: 0.95-1.20 ohms. Secondary: 11,300-13,300 ohms.

If the readings appear at all questionable, change it. They aren't that expensive. Make sure all connections are clean and tight, not corroded - including the ground.

After that, PCM or ASD relay. I'd start with the ASD relay.

 

thank you, Dan. Saved me! :P

 

Well found the problem it was a bad coil after all,,,i will never trust the primary and secondary test with a meter again,,,,coil showed to be good but did other test to find that it was the coil....i want to thank all the guys who got with me and give me the info on what to test...

Thanks very much everyone,,,time to go hunting baby....


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