Question about 2001 Pontiac Montana
I was chasing ghosts awhile back too....Had the hardest time figuring why my engine was running roughly, even after replacing the plugs, wires, MAF....I began thinking it was the intake manifold gasket....then maybe it was the injectors......It turned out to be my ignition coils. 2 out of three were misfiring....I thought the spark control module may be causing the ignition coil problem because I didn't believe two coils could go bad at the same time....so I bought a new spark control module and 3 new ignition coils and switched them all out to solve the wicked bad misfire...then I noticed what felt like a cylinder completely dead...not firing at all when I was traveling at 45 + mph....searched and tried a few diagnostic tricks to check the manifold gasket...then I noticed a pile of grease on the car frame just below and all around on of my CV joints. What I thought was an ignition problem turned out to be a warbling CV joint. Replaced it and now....all is calm....
Do you possibly recall a recent incident where your ignition coils may have been exposed to moisture? I did ...I later recalled I had done some wet work around my coil packs a few weeks back...right near the time the trouble started.
I purchased a testing device that you install between the coil and plug wire, that will indicate whether or not the coil is supplying a constant steady spark with enough juice to properly ignite the plug and fuel/air mix in the cylinder . It was 10-12 bucks. It has a light in an enclosed transparent housing that indicates the health of the spark being sent from the coil by brightness and evenly timed blinks.
When I used it there was an obvious difference in the light intensity and timing of the blinks between good and bad coil fire.
depending where your ignition coils are located, the job is real simple to perform and the parts were around $140.00. in California. Good luck be safe and I hope I helped some.
Posted on Mar 07, 2015
If the maf sensor was a boneyard one id tey another, otherwise if its new, check wires/and wire harness for a short or broken prong
Posted on May 01, 2013
I am having the same issue with my 97 regal. I am thinking it might be the MAP sensor
Posted on Jan 08, 2013
Bad MAF sensor.
Posted on Mar 27, 2011
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Posted on Jan 02, 2017
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