99 misfiring, now won't start

[65 Stingray]

Double post

[65 Stingray]

Gentlemen,

I appologize for jumping the gun and throwing ideas off the top of my head. I got a little ahead of myself and posted like a fool. I appologize, I am here for help.

I have done more testing and finally came up with a scanner. Here is what I've come up with. I unplugged injectors and put a voltmeter to them. Nothing until it cranks. 2 quick reading then nothing. Just like the noid lights, 2 flashes and thats it.

The 8 coils are all firing, I don't see a ground wire or any other way to test other than putting a spark plug in the wire and laying the plug on metal to see if it fires.

The scanner shows code P 1631, security. I checked the internet and say to do a key relearn after replacing the PCM. I followed the proceedure by MT-2500 and nothing. The code was cleared and did the relearn, nothing. I checked more on the internet and what is strange, the procedure says I will see the security light for about 10 minutes. The security light never came on, with the door open or closed, nothing. Only the battery light. I had the charger connected and showed 78% charge at 12.9 volts.

Any ideas?

[j cAT]

Originally Posted by 65 Stingray

Gentlemen,

I appologize for jumping the gun and throwing ideas off the top of my head. I got a little ahead of myself and posted like a fool. I appologize, I am here for help.

I have done more testing and finally came up with a scanner. Here is what I've come up with. I unplugged injectors and put a voltmeter to them. Nothing until it cranks. 2 quick reading then nothing. Just like the noid lights, 2 flashes and thats it.

The 8 coils are all firing, I don't see a ground wire or any other way to test other than putting a spark plug in the wire and laying the plug on metal to see if it fires.

The scanner shows code P 1631, security. I checked the internet and say to do a key relearn after replacing the PCM. I followed the proceedure by MT-2500 and nothing. The code was cleared and did the relearn, nothing. I checked more on the internet and what is strange, the procedure says I will see the security light for about 10 minutes. The security light never came on, with the door open or closed, nothing. Only the battery light. I had the charger connected and showed 78% charge at 12.9 volts.

Any ideas?

you must have a security light ...check all fuses with a voltmeter...this could be the BCM module as well..

with a security issue the engine will start then quickly die...

[MT-2500]

Originally Posted by darkangel8

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[65 Stingray]

Gentlemen,

After checking with the computer, I learned the only 2 places in my town that can program my BCM are the 2 GMC dealers in town. I am a little disturbed as I have replaced everything my friends have told me. Yea, I know I was in need of new plugs and wires, but pressure regulator? who knows, it was very expensive, but what the hay. Without this forum I would have replaced the crank sensor and the sensor on the intake at the rear, I don't remember, its been a long couple of weeks.

I talked to a friend who has a shop and he was looking on his computer with my gripes. he said what he had heard sounds like the BCM, and he could replace the computer, but.... there are 2 places in town that could program it, the chevy and gmc dealers. I told him to replace the computer and the drivers side window guts (since it broke a cable). He had his wrecker come to my house and tow it to his shop. I am getting cost on parts and a discount on labor. Towing was....... NOTHING. I give up, I've done the volt testing and all that has been advised. I really hate this as I like to figure out my problems and fix them. It was a real upset when told it was the bcm and only the gm dealer could program it (nobody in town spent the money for the program).
My truck has been in the shop for over a week and I am awaiting the bill, along with what was wrong. I'll post with the findings, if it is any benifit. I am really upset as it should be an easy fix, without all computer junk. What happened to the good old days?
No security light was the big flag, other computer test's lead him to believe it was the bcm, I don't know, but when it is figured out, I'll let you know.

Jeff

[j cAT]

the only way this will be repaired correctly is if the shop has tech's that can troubleshoot electronic equiptment, and have the OEM shop manual to determine why you lost the security LT.

I doubt this is a simple reprogram of the BCM...

please reply with whatever they find that corrects this .