My 2000 grand am 3.4l wont start. I had changed the crank sensor in novemeber and it ran for a day and quit running again. I tried replacing it again in case i just got a bad one but no go. I have spark not sure about fuel though. It acts like it tries to start every once in a while. I can hear the fuel pump kick on. When key is on it won't throw a code which it should because it always throws a code about the egr valve. I'm wondering if this could be the PCM. Any help would be appreciated. Thanks.
00 3.4l wont start
- Thread starter chadcam84
- Start date
Kevlar
New member
You may also want to check pn the theft deterrent system, that also can cause the symptoms you describe.
It was shutting off on me as i drove down the road and just completely quit starting. I hauled it home and changed the crank sensor because those seemed to be symptoms and it fired right up. I drove it all day then didnt drive it at all the next and on the following day went to go to work and it wouldnt start and hasnt since. Thats been since nov. 12th. I tried the whole theft thing and that didnt help plus the security light isnt on.
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richardgriese
New member
Well, you've got some more testing to do.
Check the fuel pressure at the rail. The pressure gauge came be bought or rented at a local auto parts store - the fuel filter could be clogged. Somewhere around 50 psi is good and it has to hold pressure for idk say ~10 minutes.
Check that the wire didn't break/melt onto the exhaust. You can remove the passenger front tire and raise the vehicle to see that sensor better. BTW there are 2 crank sensors just fyi; the one I am referring to is the "stick" 7x crank that is on the odd cylinders (firewall side)
Check spark on the other cylinders.
Once you establish that you have spark and fuel, then you need to check air (simple lol make sure it gets air) and compression (but let's wait on that test ftm). Have you done any work recently to the car?
Check the fuel pressure at the rail. The pressure gauge came be bought or rented at a local auto parts store - the fuel filter could be clogged. Somewhere around 50 psi is good and it has to hold pressure for idk say ~10 minutes.
Check that the wire didn't break/melt onto the exhaust. You can remove the passenger front tire and raise the vehicle to see that sensor better. BTW there are 2 crank sensors just fyi; the one I am referring to is the "stick" 7x crank that is on the odd cylinders (firewall side)
Check spark on the other cylinders.
Once you establish that you have spark and fuel, then you need to check air (simple lol make sure it gets air) and compression (but let's wait on that test ftm). Have you done any work recently to the car?
i replaced the fuel filter when it first started shutting off on me. How do you get to the spark plugs on the back of the motor? Thats why i didnt check them i assumed if three are getting spark then it shouldnt keep it from starting.
richardgriese
New member
Get back there and yank them out. Remove the ICM and pull the plugs to inspect - I actually crawl onto the engine to get a good look at the back just get something for your knees and some junk pants. There is a tester you can get to see that spark is going down the wire too. double check the connections for the spark plug wires to make sure you put them back the in the correct order.
Edit: BTW you have a good battery with a strong CCA/voltage?
Edit: BTW you have a good battery with a strong CCA/voltage?
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