Question about 1987 Pontiac Bonneville
Engine will turn over but backfires through intake. Cam and Crank sensors replaced.
No timing adjust can be made
When you install the crank sensor did you adjust so it won't touch anything. there is a tool to adjust it like
hope it helps
Posted on Apr 04, 2014
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Posted on Jan 02, 2017
SOURCE: jumped timing?
It really does sound like the timing went out of whack. The timing belt should be replaced periodically, according to your owner's manual. It may have worn and stretched just enough to slip over a cog a bit. Remove the timing belt covers and check the alignment of your cam and crank. There should be subtle marks on the cogs and the rear cover or casting. The compression will be good during a cranking test, but will not be ok during a running compression check. Replace the timing belt and check the pulleys. If your timing belt did not slip, the timing chain tensioner or guide shoes may be worn and will require replacement.
Posted on Aug 08, 2008
SOURCE: Pontiac Shutdown
I can solve your problem. I have the same Pontiac, year, make everything....The same thing happend to me...Turned out to be the coil packs. The car died while I was driving and then ran like ****.
Posted on Jun 28, 2009
SOURCE: my 1995 pontiac transport. i
All circuits are linear.
First there is a fuse, then the ignition switch, then the ECU, then the ECU puts out the signal to the coil packs based on input from the sensors.
But you need to check if power ever even gets to the Electronic Control Unit.
There is also a knock sensor.
All car went to electronic ignition, not only to avoid the need to set and replace points all the time, but also because they needed to have electronic control over timing advance and ******, based on things like engine knock, fuel quality, O2 sensor feedback, temperature, etc.
But don't just replace things.
Things like an ECU can be taken in and tested at a place like Autozone.
Posted on Aug 24, 2010
The crank and cam sensors produce ac voltage that is sent to the computer. There are magnets or components on the crank and cam that the sensors "read".
The problem could be the harness between the sensors and the computer, or a mechanical problem like a timing chain or gear.
Posted on Sep 21, 2012
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