Question about 1991 Pontiac Grand Am
1991 grand am with 2.5L. I believe its a C3I ignition system: two coil packs over mounted over ignition module with a sensor that goes into block to the crankshaft. My Haynes manuel has two different diagrams in two seperate sections: first shows spark plug wires are attached to the coils from top to bottom 2-3-4-1; the other shows 3-2-4-1. Which is correct if either is correct?
SOURCE: 93 pontiac grand am
This happened to me on my 93 grand am. I also like you got new sensors and a new computer which did not fix the problem. It turned out to be a cracked wire at the battery. Thats right a wire on the positive side of the battery that wasn't even broke all the way through. I re spliced the wire and VAROOOOM it fired right up.
Posted on Jan 13, 2009
SOURCE: car wont start
I noticed you replace the crankshaft sensor, but not the CAMshaft sensor.
The Ignition module takes the input of both sensors to tell the coil when to energize.
This sensor should come up as an error code when you attach a obd reader.
Even if your light is not on - there may be a code. If it is not your vehicle originally, some people pull the bulb!
Posted on Jan 22, 2009
SOURCE: 2003 grand am 3.4 code p0304
More likely a plugged injector as that code is specific to cylinder # 3 These engines are also very prone to failed intake manifold gaskets and stuck valve lifters. I think I'd start with a compression test, if that's good, go injector. If the compression is bad, you've got a can of worms. Hold off on the O2, I don't think it's related.
Posted on Mar 14, 2009
A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.
Posted on Feb 25, 2010
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