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Old 01-09-2006, 08:12 AM   #11
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Frequently the scanners will report a P06XX and you can find the code if you look up P16XX. Merely put the 1 in front of the 6.

Not sure why, but it works.
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Old 01-09-2006, 01:03 PM   #12
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Code 1623 Faulty or incorrect PROM

Check that the PROM is correctly inserted in the socket... If it is, replace the PROM, clear memory and recheck... If the code 1623 reappears replace the PCM...

Thats what the Service Manual says...

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Old 01-09-2006, 01:23 PM   #13
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How old are your plugs and wires? A majority of the time old plugs and wires will trigger the misfire code.
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Old 01-09-2006, 01:30 PM   #14
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Is this Actron super scanner a CP9145 or a CP9150?

Both of these should be able to monitor the Cylinder miss fire in real time... There will be a list that will show Cylinder Missfires... 1-6

Next to the cylinder number, there will be a Missfire Detected ( Yes ) or ( No )

This is how I found my cylinder 4 missfire on my 95 Bonneville

But beware if the PROM or PCM is bad you'll never get the car to run right

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Old 01-10-2006, 06:16 PM   #15
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First, thanks everybody for your help.

Here'* where I'm at now:

Changed plugs, wires, pcv and the cam position sensor (on advice of someone who had a nearly identical problem just last week).

I checked to see that all the coils are working with a timing gun, they all do.

The #4 and #6 plugs were fouled badly, smelled of gasoline. #2 plug slightly fouled, but should've been firing without trouble.

Anyhow, I replaced all of those things, car runs better, but still not *right*. Check engine light still on...pull codes (I bought the Actron 9145), and there are no codes!?!?!?! WTF? Sometimes it runs perfectly, other times it definitely misses.

So, what now?
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Old 01-10-2006, 06:21 PM   #16
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Also, two more questions:

Does the 95 have an ECM or a PCM?

What is the letter code for supercharged car, K?
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Old 01-10-2006, 06:23 PM   #17
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Quote:
Originally Posted by gruveb
Also, two more questions:

Does the 95 have an ECM or a PCM?

What is the letter code for supercharged car, K?

PCM, and its the number 1, not a letter.
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Old 01-10-2006, 06:29 PM   #18
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Lets explain the diffrence..

ECM is Engine Control Module.... This controled the engine, and the Torque converter lockup function..

PCM is Powertrain Control Module , it controled the functions of both the engine and the electronic transmission..

And like Morthel said... Vin 1 is the supercharged...

Look at the 8th didget of your vin number and that will be the engine code...

Good Luck

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Old 01-10-2006, 07:16 PM   #19
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Ok, I checked with the scanner...no misfires on any cylinders. MIL on, yet no codes. LIke was said, the manual says to check connections at the PCM, if all is good there, PCM problem. :(

So, now to expose the level of my ignorance in greater depth...I get a remaned PCM from where-ever...to have it reprogrammed, does it have to be installed or can I take just the computer to a shop with my VIN # and have them program it, and then bring the computer home and install it in the car?
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Old 01-10-2006, 07:28 PM   #20
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On the 95'* the PCM simply needs to be replaced and you need to swap in the EPROM from the old PCM... SES with no codes makes me think that there is an issue with the PCM... If you were near me we could easily test it all out... The PCM removal and replacement only takes a few minutes and is easy... There is no reprogramming involved on the 95 Bonnevilles

I can't say for certain that the PCM is the problem, I'd swap in a known good unit which I finally have as a trunk PCM for long trips.. If the SES light goes away and the car runs good again, then you know you have cured the problem... But again I can't confirm a bad PCM from here.. But I do feel its the problem... And in rare cases the EPROM can be bad too...

What is the manufacture date on the door of the car? I'm wondering if you have an early build 95 Model... Mine was built 12/22/94... Some of the earlier 95'* had some EPORM issues...And I have killed off the original PCM and a Reman PCM... Have been running a PCM from a low milage 95 and have had no further issues at all...

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