All 3 Ignition coils died at the same time? (Updated Aug23)
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Originally Posted by bill buttermore
I was doing some searching and I came across this thread where a fellow had similar symptoms that turned out to be an internal coolant leak. Not saying that'* your problem, but you might want to have a look.
http://www.bonnevilleclub.com/forum/...ic.php?t=50430
http://www.bonnevilleclub.com/forum/...ic.php?t=50430
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Originally Posted by Technical Ted
Here'* something you can try when you put the plugs back in.
Turn the key to the run position to prime the fuel pump.
Pull the fuel pump relay & try to start.
Hopefully that will be enough gas to let the engine fire for a brief second but not enough to flood it.
We still need to determine if the problem is too much fuel or a weak spark. If the engine fires briefly during the above test then gets flooded when the relay is replaced I think the problem is most likely fuel related. If the engine doesn't fire at all I'd look for a junkyard ICM with coil packs.
Turn the key to the run position to prime the fuel pump.
Pull the fuel pump relay & try to start.
Hopefully that will be enough gas to let the engine fire for a brief second but not enough to flood it.
We still need to determine if the problem is too much fuel or a weak spark. If the engine fires briefly during the above test then gets flooded when the relay is replaced I think the problem is most likely fuel related. If the engine doesn't fire at all I'd look for a junkyard ICM with coil packs.
Originally Posted by Arbelac
I've had the throttle body off and checked the UIM...all good there.
Originally Posted by Arbelac
Is, the FP relay under the passenger side cover or in the engine maxifuse bay?
I've got a '96 PCM laying around collecting dust, so if you can't find one, I'd be glad to sell you my extra. And yes, they are like the '97 computers and have a removeable knock module or whatever that needs to be moved from one ECM to the other.
I will tell you for sure that the computer won't work with your car when you get it, and you'll need to have a dealer (or anyone with a Tech-II and a subscription to GM'* service who'* name is excaping me right now) flash it with the proper programming.
About the MAP, it shouldn't stop the car from even firing a little, but you could try to unplug it and see if it makes a differance. :?: Couldn't hurt.
At your mileage (85k) I would doubt that your timing chain jumped time. You've got fuel, you've got spark, and it still won't run. Other than what everyone has said, I'm stumpped.
I will tell you for sure that the computer won't work with your car when you get it, and you'll need to have a dealer (or anyone with a Tech-II and a subscription to GM'* service who'* name is excaping me right now) flash it with the proper programming.
About the MAP, it shouldn't stop the car from even firing a little, but you could try to unplug it and see if it makes a differance. :?: Couldn't hurt.
At your mileage (85k) I would doubt that your timing chain jumped time. You've got fuel, you've got spark, and it still won't run. Other than what everyone has said, I'm stumpped.
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Originally Posted by Technical Ted
Here'* something you can try when you put the plugs back in.
Turn the key to the run position to prime the fuel pump.
Pull the fuel pump relay & try to start.
Hopefully that will be enough gas to let the engine fire for a brief second but not enough to flood it.
We still need to determine if the problem is too much fuel or a weak spark. If the engine fires briefly during the above test then gets flooded when the relay is replaced I think the problem is most likely fuel related. If the engine doesn't fire at all I'd look for a junkyard ICM with coil packs.
Turn the key to the run position to prime the fuel pump.
Pull the fuel pump relay & try to start.
Hopefully that will be enough gas to let the engine fire for a brief second but not enough to flood it.
We still need to determine if the problem is too much fuel or a weak spark. If the engine fires briefly during the above test then gets flooded when the relay is replaced I think the problem is most likely fuel related. If the engine doesn't fire at all I'd look for a junkyard ICM with coil packs.
I also picked up a cheap basic multimeter - this one gives me readings for the secondary terminals:
3/6 - 5.99Kohms
2/5 - 5.74Kohms
1/4 - 5.82Kohms
I also repulled the 2/5 coil and checked the primary, and the resistance tended to jump/flux quite a bit.. anywhere from 0.16 ohm to 0.6 ohms. Are we just supposed to check the highest value, or is it supposed to be steady on the primary windings?
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Originally Posted by BlownBuick
I've got a '96 PCM laying around collecting dust, so if you can't find one, I'd be glad to sell you my extra. And yes, they are like the '97 computers and have a removeable knock module or whatever that needs to be moved from one ECM to the other.
I will tell you for sure that the computer won't work with your car when you get it, and you'll need to have a dealer (or anyone with a Tech-II and a subscription to GM'* service who'* name is excaping me right now) flash it with the proper programming.
About the MAP, it shouldn't stop the car from even firing a little, but you could try to unplug it and see if it makes a differance. :?: Couldn't hurt.
At your mileage (85k) I would doubt that your timing chain jumped time. You've got fuel, you've got spark, and it still won't run. Other than what everyone has said, I'm stumpped.
I will tell you for sure that the computer won't work with your car when you get it, and you'll need to have a dealer (or anyone with a Tech-II and a subscription to GM'* service who'* name is excaping me right now) flash it with the proper programming.
About the MAP, it shouldn't stop the car from even firing a little, but you could try to unplug it and see if it makes a differance. :?: Couldn't hurt.
At your mileage (85k) I would doubt that your timing chain jumped time. You've got fuel, you've got spark, and it still won't run. Other than what everyone has said, I'm stumpped.
Your secondary readings all look good. The primarys should also give a constant reading. Try checking all three primarys making sure the terminals are clean.
I tried using the 194 bulb to check for power going to the injectors. The bulb would 'pulse' while the engine was running. It never went on or off all the way. Trying this should show if the injectors are staying open or not. It'* easy to do & should only cost a dollar or two.
If you have a timing light we could test to see if it'* sparking near top dead center.
While you're checking the coil resistance see if you can get a reading from the engine temperature sensor. You can also check the voltage from the throttle position sensor.
From other posts I've read it sounds like some auto parts stores can test your ICM.
Consider getting yourself a code scanner. It may tell us whats wrong & save you the dreaded trip to the dealer.
I tried using the 194 bulb to check for power going to the injectors. The bulb would 'pulse' while the engine was running. It never went on or off all the way. Trying this should show if the injectors are staying open or not. It'* easy to do & should only cost a dollar or two.
If you have a timing light we could test to see if it'* sparking near top dead center.
While you're checking the coil resistance see if you can get a reading from the engine temperature sensor. You can also check the voltage from the throttle position sensor.
From other posts I've read it sounds like some auto parts stores can test your ICM.
Consider getting yourself a code scanner. It may tell us whats wrong & save you the dreaded trip to the dealer.
Originally Posted by Technical Ted
The bulb would 'pulse' while the engine was running. It never went on or off all the way.
Arbelac - As far as I know, the PCM must be in the car to be reflashed. The dealer will do various procedures involving key-on and key-off ignition positions, and the PCM must be receiving input from the car.
Also, I would like to point out that we're suggesting some troubleshooting tips that require you to buy different tools and spend some of your hard-earned cash. While it can get expensive to acquire the right diagnostic tools to properly do a job, I want to encourage you to keep looking into this problem yourself. Sometimes it can seem like it would be cheaper and easier to take the car to a mechanic, but I promise you'll thank yourself afterward for spending money on diagnostic tools and learning about the workings of this car. Don't be put off by the investment now, because it can potentially save you a bunch of money down the road. If you've got the time and energy to keep chasing these gremlins, keep at it.
Originally Posted by Arbelac
I may take you up on that. Question: Does the PCM/ECM have to be in the car for it to be flashed or can it be flashed before installation?


