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bigwrench3311 09-23-2012 02:02 PM

bigwrench3311
 
working on 1993 dodge dakota 3.9L 4x4 auto. no spark ,have 12 volts to coil. changed crk. sensor,cam sync. no help. has 12 volts to f.pump but pump is bad. please help! thanks.

hcompton 10-17-2012 10:29 AM

Most efi will not run the pump if there is no spark or crank signal. That might be your issue with the pump. Also no fuel pressure no spark in new efi systems but i know nothing about dodge. Just trying to help.

Always check computer ground and 12V at ecu hot wire. Bad grounds will hang up even the best mechanics. Make sure the block has a ground wire running from the motor to the frame also.

sbchevfreak 10-17-2012 02:06 PM

Dodges of this era were notorious for coils going kaput. Remove the coil, and look at the laminbated core for any signs of rust or swelling. If there is ANY sign of this, replace the coil, as they swell internally, and kill the windings.

LATECH 10-17-2012 05:53 PM

Check the basics as the guys have mentioned earlier in the post.

The coil may have power, but you also need to check to see if it has the ground pulse from the PCM to fire the coil.

The coil needs a ground pulse, and it is supplied by the PCM.
Hook your test light clip to the battery positive, then un hook the plug at the coil. Probe the non hot (not the 12 v + side) side of the coil harness, and crank the engine. It should blink as the engine is cranked.
If it does not the PCM is likely the problem.
If it does blink, the the coil must be defective.
The PCM processes the cam and crank signal and triggers the coil and injectors. The PCM could be defective in the output stage to the coil, or the reference voltage section for the cam and crank sensors has failed, and they arent generating a signal for the PCM to use for coil triggering.


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