Code P0372 - Page 2 - Chevy Impala SS Forum
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post #11 of 43 (permalink) Old 06-18-2017, 04:56 PM Thread Starter
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Ok so here are some items that I'm going to buy. Opti spark or should I just get a new rotor and cap? New optispark harness. New ignition control module and coil. Anything else I should get?
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post #12 of 43 (permalink) Old 06-18-2017, 07:57 PM
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Check and or replace the CTS. When they go bad they can cause all kinds of issues. Do you have a scanner that you can see live data?

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post #13 of 43 (permalink) Old 06-18-2017, 08:33 PM Thread Starter
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Not live data.
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post #14 of 43 (permalink) Old 06-19-2017, 07:22 AM
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Originally Posted by Juancolchado View Post
Ok so here are some items that I'm going to buy. Opti spark or should I just get a new rotor and cap? New optispark harness. New ignition control module and coil. Anything else I should get?
first just change the ICM/coil components.. the arcing in the old distributor will damage the ICM.. the coil should also be replaced if it is 21 yrs old esp where you live in high humidity ... then see if it runs good with not dying .. then if the 372 code comes back the opti must be replaced.. having gone thru this 372 with install of new opti it may take some time to throw the code.sometimes very fast..

so if you do have to replace the opti due to the 372 code install opti only .. do not put water pump on .. with a scan tool connected start engine see if it runs good and check for any codes .. run for like 20-30 sec.. only... if all good then complete the repair ..

what will happen on the 372 code the PCM will read the error as pending ,,,, then at a later time throw the CEL light on and label the failure as confirmed ... tricky

learn from my mistakes . ...
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post #15 of 43 (permalink) Old 06-19-2017, 10:21 AM
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For the OP, I'm just making sure we're all tracking the same through this with you. All those opti pics you posted are just the 20-year old distributor you took out, right? Not a whole lot to apply to progression of events beyond that, or pertaining to the suspect new Opti you have in there now except to show obvious and unusual scoring (not cracking) of the rotor, right?

If you're asking whether to ditch the crap new opti (you'll never get a refund, just another potentially crap replacement), or worth reusing the old opti with new parts then I'd seriously explore the Skip Wiess rebuilt solution for ? $100 ??

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first just change the ICM/coil components.. the arcing in the old distributor will damage the ICM.. the coil should also be replaced if it is 21 yrs old esp where you live in high humidity ... then see if it runs good with not dying .. then if the 372 code comes back the opti must be replaced.. having gone thru this 372 with install of new opti it may take some time to throw the code.sometimes very fast..

so if you do have to replace the opti due to the 372 code install opti only .. do not put water pump on .. with a scan tool connected start engine see if it runs good and check for any codes .. run for like 20-30 sec.. only... if all good then complete the repair ..

what will happen on the 372 code the PCM will read the error as pending ,,,, then at a later time throw the CEL light on and label the failure as confirmed ... tricky

learn from my mistakes . ...
And my mistakes - so far. In my case I cleared the 0336 at an O'Reilly's and restarted in the lot and VOILA! no code! I took the scanner back in and 1 minute heading home the MIL lit up again! I found reading this forum that the first restart logs a fault, and as early as the second restart it sets. I went right back the next day and recleared and tested to confirm this.

Funny thing is I bought this FW last year with only 55,XXX and wondered what possessed anyone to replace the whole distributor with that few miles. It translated into a better deal for me I guess as the seller was outright frustrated with the whole affair and offered a measurably lower price. - which I paid for in the form of a removed MIL bulb (which I still don't suspect the seller of doing himself), together with uncovering that code when I tried to get state inspection.

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post #16 of 43 (permalink) Old 06-19-2017, 07:41 PM
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looking thru my notes on this the opti distributor connector maybe the problem and or the optical sensor ..
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post #17 of 43 (permalink) Old 06-20-2017, 04:11 PM Thread Starter
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Quote:
Originally Posted by 4x4high View Post
Check and or replace the CTS. When they go bad they can cause all kinds of issues. Do you have a scanner that you can see live data?
I will also change the sensor.


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first just change the ICM/coil components.. the arcing in the old distributor will damage the ICM..
learn from my mistakes . ...
This makes sense, the coil will work fine until it's hot enough and then craps out, sends no spark and car shuts off. When trying to restart, it wont turn on because it's damaged and hot. Finally when cooled off the car will start back up. thanks.





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Originally Posted by 96 Black View Post
For the OP, I'm just making sure we're all tracking the same through this with you. All those opti pics you posted are just the 20-year old distributor you took out, right? Not a whole lot to apply to progression of events beyond that, or pertaining to the suspect new Opti you have in there now except to show obvious and unusual scoring (not cracking) of the rotor, right?

If you're asking whether to ditch the crap new opti (you'll never get a refund, just another potentially crap replacement), or worth reusing the old opti with new parts then I'd seriously explore the Skip Wiess rebuilt solution for ? $100 ??



Yes, the assumption is that it's a 20 year old opti. The motor is a 355 so it has been taken off before. Yes, that scoring is unusual and kind of hard to figure out where it came from. When I first took it off the copper scoring was shinny like if it just happened. Not sure the route to go on the opti. I was asking due to me seeing a bunch of name brand opti's cap and rotors for about $150.00. Do you have a link to these rebuilt optis?


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Originally Posted by j cat View Post
looking thru my notes on this the opti distributor connector maybe the problem and or the optical sensor ..
Thanks, let me know what you find. I've been busy with other things. I'm going to wait until this Friday to purchase some of these parts.

Let me know if there is anything else I should look for.


Last edited by Juancolchado; 06-20-2017 at 04:16 PM.
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post #18 of 43 (permalink) Old 06-23-2017, 04:28 PM Thread Starter
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Today was the day, I wanted my baby back but it was not as successful as I thought it was going to be.

I got off work at 730am an went straight to O'reily and picked me up a ICM and coil. took the old one off which was the OE and bought some new plugs as well . I cleaned up the base and the heat sink. Put everything back together and started it up. waited till it was at operating temp and took it twice around the block without stalling. Was pretty happy at the time so I took it to the main road and after a 1/4 of a mile the engine stalled again and I rolled it to a near by parking lot where it is currently sitting. I decided to leave it there due to traffic and I had someone pick me up. headed to O'reily again and picked up a new opti spark and a new CTS. I'm going to wait until tonight to bring it home when there is no traffic. No codes were triggered.

Here are some pictures of the old ICM, Coil an spark plug. the white housing cracked.










Here are the new parts. the base and heat sink cleaned and put together.








and last but not least the new Opti with new plug which looks pretty decant with Life Time Warranty and new CTS. Ill be installing this prob tomorrow.



Last edited by Juancolchado; 06-23-2017 at 04:31 PM.
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post #19 of 43 (permalink) Old 06-23-2017, 05:52 PM
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I cleaned up the base and the heat sink. Put everything back together
Without new heatsink grease between the ICM and heat sink the ICM will fail quickly.

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post #20 of 43 (permalink) Old 06-23-2017, 06:24 PM
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AC Delco electronics are what many here recommend. Discount parts houses use "lifetime" warranties to sell parts that few would install otherwise. If they function for a year,consider yourself fortunate...

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