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If the fuel pump is not producing enough pressure or the regulator not functioning properly will it cause the PCM to not let the coils fire?
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Re: No start problem
No.... The coils will still fire.sigpic
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Re: No start problem
I've that you can have the PCM "de-programmed" to remove certain things like the VATS security system, O2 sensors , etc. how do you do it? I think I have a VATS problem or either a loose connection somewhere. Its a 3800 with a 5 speed and in will intermittently not start (no fire) then without notice it will start. this happens at no particular time and done it when the engine is hot and when cold. I've checked that the ICM is getting power, grounded, checked power to crank sensor, checked both pulses from the crank sensor, had the ICM checked on 2 separate occasions and ALL tests good. There has even been a few times that it wouldn't start and when I attach the spark checker it then cranks right up, there has been a few times that it won't start and I touch the wires going to the crank sensor and it will start but these circumstances are not always true.I've tried bypassing the key with resistors no change. I might go out there right now & it may crank but may not. There are no consistent pattern. I'm confused. One time the securty light was on and it wouldn't even crank over but after a few minuted it did, thats why I wonder if its in the security system.Comment
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Re: No start problem
VATS will stop the motor from cranking and stop the fuel pump from running. You may just have a bad ignition switch.sigpicComment
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Re: No start problem
When you turn the key on the pump comes on and cycles and the engine turns over, it won't start. . . sometimes. I've been wondering if its in the switch.Originally posted by bigbrian442 View PostComment
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Re: No start problem
If it's VATS wouldn't that cause the Security light to come on every time when it doesn't start?2002 Silver Firebird A4<br />T-Tops, Leather, Y87, W68, Chrome Wheels<br />Bone StockComment
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Re: No start problem
This thing is weird, once (back in oct 2012) when it didn't start it did cause the security light to come on and wouldn't do anything, but after a few minutes it cranked and started right up. One other time the security ligh was on and it wouldn't do anything but after it went off it would crankover but not start, thats the ONLY 2 times my security light has come on. 99% of the time though mine will crank over, it just don't start then without notice it starts right up. I've found several things along the way that I THOUGHT was the problem but then it does it again. the 90 degree elbow at the front of the intake was leaking and "appeared" to be getting on the crank sensor and/or wiring, I fixed that and thought the problem went away only to have it to do it again. I love the car but this is really starting to be annoying get on my nerves not bein able to drive it when I want or need to. Thats why I'm about ready to have all that stuff "DEPROGRAMMED" from the computer and see if it helps.Originally posted by Rob Bell View PostComment
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Re: No start problem
Its pretty simple from what I've read. Only happened once to me, and of course it was December at about 2am. But if I remember correctly all you need to do it put a resistor on one if the wires going to the ignition? Something like that. Search it up, there's plenty of written cases of this happening. If nothing comes up on the site, Google is your friend.Comment
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Re: No start problem
Done tried the resistor thing and didn't change a thing, still wouldn't start!Originally posted by Docta View Post
What exactly is it that goes bad with the ignition switch? I got my column down and looked up in there to the switch but thats about it, started getting dark and colder! Oh and still isn't starting but will crank over.Comment
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Re: No start problem
are you getting any sparkComment
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Re: No start problem
The contacts wear out just like any other switch.sigpicComment
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