Intermittent crank no spark

Grand Prix and Grand Am, Bonneville, Montana and Transport.
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Intermittent crank no spark

Unread post by Guest » Fri Nov 20, 2020 1:34 pm

98 bonneville 3800 series 2. Crank no spark. Replaced cam sensor, crank position sensor, icm, all coil packs. Car stalls and won't restart. Cranks but no spark. Unplugged icm and car starts and runs again. Will stall a day later , unplug icm and restarts. No codes other that evap.

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carriedi
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Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: Intermittent crank no spark

Unread post by carriedi » Mon Nov 23, 2020 1:35 am

You replaced all the important parts but have you checked if the signals are getting to the computer? You really need to use a good scanner that can tell you if you are getting all the right signals coming to the ECM/PCM.

Dash fuse panel, fuse 6, Fuel pump is the fuse that also goes to ignition module on a pink wire. the white and black wire powers up the cam and the crank sensors. the black/white is the ground from the sensors back to the ignition module.

while the parts may be new you have to verify that the wiring between all the parts has good contacts and no pinched or wires rubbed through.

let me know if you find anything... of what you can check out

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