Corrupting chip?

[dave w]

So any ideas, or anyone have anything like this happen before? I haven't read anything like this before.

After about 1 year of working perfectly, the ZIF socket (low profile) that was installed on a G1 Memcal adapter board cause many of problems your experiencing. I removed the ZIF socket and installed the chip directly into the G1 Memcal adapter board. Some 6 years later, with the chip installed directly into the G1 Memcal adapter board the chip is still working flawlessly.

[ralmo94]

If it doesn`t keep state the chip is for the trash.

I was afraid of that, I do have another brand new chip I could solder to another memcal.

It does sound like the chip or even something in the PCM itself. Do you have a complete spare computer you could swap in?

Yes and I have swapped it but it doesn't seem to do anything different.

To test the alternator, put your voltmeter on AC, one lead on the negative post of the battery not the clamp but directly on the post, and the other lead on the output of the alternator. Anything over 0.2 V is too much. You can see it more clearly with a lab scope but a voltmeter works fine. I haven't seen temperature affect it very much but you can check it hot and cold. You might also check the actual output, should not be over 14.6 V. And is always triple check your grounds.

I'll have to check it with a multi meter.

After about 1 year of working perfectly, the ZIF socket (low profile) that was installed on a G1 Memcal adapter board cause many of problems your experiencing. I removed the ZIF socket and installed the chip directly into the G1 Memcal adapter board. Some 6 years later, with the chip installed directly into the G1 Memcal adapter board the chip is still working flawlessly.

Did you have to re burn the chip?

I have taken the adapter all the way out of the equation, but maybe it was too late for the chip?

[dave w]

Did you have to re burn the chip?

No. Removed the ZIF and installed the chip directly into the adapter board.

[ralmo94]

So interesting update, haven't had time to mess with the truck yet, but it was in the way so I had to move it, first time it was still in limp mode, second time it ran fine. So I still need to verify the chip with the bin to see if it still matches or not, but last time it did this it didn't match.
Still have to check for AC ripple voltage.

[ralmo94]

Another update.
Checked with multimeter, and get 0 v ac while engine running, DC is about 14.4v. Also truck has started and ran fine without doing anything to the chip. It also passed my attention previously, but the neg terminal is coroded.

[MO LS Noobie]

I never saw a perfect diode pack in an alternator. Lowest ac voltage that I have seen with running engine is 0.005, most are closer to 0.010 VAC. The dirty battery terminal would definately be an issue.