Code P0372 - Chevy Impala SS Forum
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post #1 of 43 (permalink) Old 06-18-2017, 12:11 AM Thread Starter
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Code P0372

Need some help with my 96 DCM. My wife went through some deep puddles and failed to tell me. A couple of days later as I'm driving my car backfires once at high RPMs. Didn't think much of it until it started getting more and more frequent to the point where it switches gears at high rpms the car shuts off and it sounds like pop corn. Told the wife about it and she told me that she went through high puddles to the point that the car cut off and she was having a hard time keeping it on and getting it started. I got a new Opti and swapped it out. car seemed to be back to normal, waited until it was at operating temp and I hit the main road and it cut off. I was having a hard time getting it to start. Waited a couple of minutes and it would start and I would drive for about half a mile at 20mph and it would cut off again and so on until I got it back home. The code I got after I got it home was p0372 my guess is that the opti is fried or should I look somewhere else? Two of my guesses are the opti plug and the vaccum harness. I'm going to be off for the next couple of days so any suggestions could help. How do I check the plug and harness and what else should I look for?.
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post #2 of 43 (permalink) Old 06-18-2017, 01:38 AM
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A quick search on that code indicates that it could be the crank position sensor.

1996 DGGM Impala SS
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post #3 of 43 (permalink) Old 06-18-2017, 07:34 AM Thread Starter
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Thanks I'll swap that out.
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post #4 of 43 (permalink) Old 06-18-2017, 08:53 AM
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First the 372 code does not cause ANY engine issues of any kind. this is just to inform the PCM that all is good on the engines mechanical position of the crankshaft and the cam shaft.

you change that sensor sh*t can happen just adding more confusion...

installing a new OPTI can be a very stressful repair, reason is these are now china crap , a big problem in this world of LT1 ....

I had this 372 code when I replaced my opti .. bad opti improperly assembled key was not properly set .. confirmed as I installed opti with cap off and the old opti rotor position was off by 1//8 IN ...it was a spectra opti made in china .. returned and used my 21 yr old opti .. sealed the gasket ..

I myself had a bad opti due to seal issues. the cap seal on the 5 year old opti leaked causing spark issues .. then the ICM/coil also had small arcing which added to this problem .. on a dry day all good , on a damp day not good.

before replacing the NEW opti I would replace the ICM/coil assy.. It is a PITA but that is a start. reset codes and see if it works if not , then the NEW opti is bad. also the new opti may come with a connector these must be sealed at the exterior wire input to the connector OR it will leak into the optical sensor component .. also ALL new opti must be pressure tested to determine NO leaks .. I use a small hand pump and a gauge to see if it holds like 5 PSI..

the old OPTI may be good .. cleaning it and if necessary new cap/rotor.. my experience is the rotor bearing does wear out this is due to OZONE created by the normal opti operation and then if the venting harness is not properly venting it will kill the distributor due to the corrosive ozone gas.

explain how the old opti looked ,you check the opti venting harness ??? need vacuum gauge..

do not mess with the crank sensor that is not the problem , my guess the new opti is china crap.

driving in puddles is not good on the LT1 ... some put sealant all over the opti to keep the water out..I do not drive my 96 in bad weather or puddles.
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post #5 of 43 (permalink) Old 06-18-2017, 11:49 AM
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Quote:
Originally Posted by j cat View Post
First the 372 code does not cause ANY engine issues of any kind. this is just to inform the PCM that all is good on the engines mechanical position of the crankshaft and the cam shaft.

you change that sensor sh*t can happen just adding more confusion...

installing a new OPTI can be a very stressful repair, reason is these are now china crap , a big problem in this world of LT1 ....

I had this 372 code when I replaced my opti .. bad opti improperly assembled key was not properly set .. confirmed as I installed opti with cap off and the old opti rotor position was off by 1//8 IN ...it was a spectra opti made in china .. returned and used my 21 yr old opti .. sealed the gasket ..

I myself had a bad opti due to seal issues. the cap seal on the 5 year old opti leaked causing spark issues .. then the ICM/coil also had small arcing which added to this problem .. on a dry day all good , on a damp day not good.

before replacing the NEW opti I would replace the ICM/coil assy.. It is a PITA but that is a start. reset codes and see if it works if not , then the NEW opti is bad. also the new opti may come with a connector these must be sealed at the exterior wire input to the connector OR it will leak into the optical sensor component .. also ALL new opti must be pressure tested to determine NO leaks .. I use a small hand pump and a gauge to see if it holds like 5 PSI..

the old OPTI may be good .. cleaning it and if necessary new cap/rotor.. my experience is the rotor bearing does wear out this is due to OZONE created by the normal opti operation and then if the venting harness is not properly venting it will kill the distributor due to the corrosive ozone gas.

explain how the old opti looked ,you check the opti venting harness ??? need vacuum gauge..

do not mess with the crank sensor that is not the problem , my guess the new opti is china crap.

driving in puddles is not good on the LT1 ... some put sealant all over the opti to keep the water out..I do not drive my 96 in bad weather or puddles.
Better rethink that statement as he HAS a P0372 code and he also HAS an issue. Also the P0372 code leads directly to a crank sensor issue.

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post #6 of 43 (permalink) Old 06-18-2017, 12:52 PM
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Yeah,and/or a broken wire. The point is that I can unplug the crank sensor,and the car will start,and run perfectly fine. Before replacing a bunch of stuff,verify the wiring,and connectors are in good shape.

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post #7 of 43 (permalink) Old 06-18-2017, 01:08 PM
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J-'s writeup and train of thought is pretty good at tracking the problem of poor quality control in non-oem Optis. There is no code for "You just installed a crappy aftermarket Opti with all-too-common misaligned optical reader".

If you never had one of the codes related to the CPS BEFORE you did an Opti r&r, then there is a definite logic flow that the CPS is not the cause of the code. It's likely whatever OTHER components communicate with it that is the root cause. The issues J- outlines have taken a while to accumulate based on the combined impact of guys ending up replacing their 20-year old distributors and the discontinuation of AC originals (with their associated quality control).

Too many of the aftermarkets are winding up with lo quality and poor assembly so that the only indication you have of problem is that trace code. I currently have a similar P0336 which came with the car from the seller who stated he had just paid $1,100 to have "a genuine dealer Opti" installed. The car runs great, but even AFTER I replaced the CPS ($50) the code remains. For reference, this supposed "genuine dealer AC Opti" has a black back (not yellow as an AC does), so the poor seller got reamed and I'm running a piece of junk Opti until digging in and swapping it out with a real AC oem I have from my old FWB along with new cap and rotor. I have to get at it because the car is due for inspection nect month and they won't give me another waiver.

So there. The only reason throwing so much detail is the thread title is perfect for future (probably definitely increasing) searches.

And of course what 1slow- added for another permutation on the same theme. For reference my wires leading away from the CPS rearward toward the starter are stiff and brittle like a boxed noodle. I bought the new plug/pigtail but it's only 3" long.

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Last edited by 96 Black; 06-18-2017 at 01:11 PM.
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post #8 of 43 (permalink) Old 06-18-2017, 01:45 PM
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Quote:
Originally Posted by 4x4high View Post
Better rethink that statement as he HAS a P0372 code and he also HAS an issue. Also the P0372 code leads directly to a crank sensor issue.
IF I live in CALI LIKE YOU I would be very concerned about any codes LOL....

yes the P0372 as others know, is nothing but a signal , to report the correlation of the cam to crank .. that is it .. only 96 LT1 has this ...disconnect it see what happens ...
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post #9 of 43 (permalink) Old 06-18-2017, 04:46 PM Thread Starter
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Ok here is an update. Went out and got an new Crank sensor and deleted the code. Symptoms remain the same. Starts right up when cold without no proplems. I let it get to operating temp and took it out for a spin around the block. Half way back is stalled and I couldn't get it started. Waited and after several more attempts it started back up. Drive a couple more hundred feet and stalled again and so on until I got it home. This time I had no codes. I took a vid of me attempting to start the vehicle




Named it "opti pop corn"

Last edited by Juancolchado; Yesterday at 07:31 PM.
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post #10 of 43 (permalink) Old 06-18-2017, 04:51 PM Thread Starter
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Here is the opti I took out. Disregard the grease marks I opened it when I was checking things out.



I noticed that crack on the rotor arm





And here is the cap

I left it outside





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