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Old 08-21-2007, 12:36 PM   #5
ChevLoRay
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Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
Re: Help 97 truck popping through the exhaust

Crank Sensor? Gotta be something common to the ignition process for all cylinders.

My daughter had an issue with her Neon, in which it would (according to her) buck and jump. No codes were set, and when I checked it, it was running okay. After a month or so of this, it died and set a code. One plug was misfiring. After a new set of plugs, no more problems. Don't think this is your issue, but there are similarities.

Still, I'm thinking the Crank Position Sensor is either good, or it's bad. Have you changed the wires and plugs, or just checked them? How did you check them? We used to hook up to a Sun Diagnostic machine and know if we had bad plug or wire by the display on the CRT. More resistance created a higher spike. It was easy to look at the displayed firing sequence and find the culprit. Nowadays, we have OBDII but no CRT.

What is the code? I have an OBDII reader and access to their expanded codes, which may help. No guarantees, though.
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'69 C-10 SWB; 350/TH400 - in limbo

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