ECM H31 code... momentary glitch or something on the horizon? - ZR-1 Net Registry Forums

billschroeder5842 · 06-22-2020

I was out today and parked to run into the store. When I restarted my 91 I got a "service engine soon." I drove for about 100 yards, turned it off and restarted and the DIC was clear. I drove home with no other issues.

I got home and pulled the codes. The car was clear except for the ECM module with a H31 meaning a "history" code for a cam sensor signal problem.

The car has been running great with no problems and I know that sometime sensors have "moments" and can throw an intermittent code then "return to normal." But (for those with experience) is this a sign of a future problem, should I inspect and/or begin looking for a cam sensor?

Thanks!

billschroeder5842 · 06-23-2020

I had a couple of on/off cycles today- no lights. I also ran the diagnostics again and nothing popped up.

I think it was a momentary LOS (loss of Sh*t)

jss06c6 · 06-25-2020

Bill,

Just watch for a while. If it recurs, might be starting to see signs of an aging cam position sensor or the weather pack connector may have an intermittent connection on the pigtail.

Steve

Sent from my SM-G950U using ZR-1 Net Registry mobile app

billschroeder5842 · 06-25-2020

Thanks Steve- will do

Young1 · 06-25-2020

My experience was intermittent codes then intermittent stop running when idling at a stoplight. Then I started looking for one to no avail until Phil re invented the cam sensor.

billschroeder5842 · 06-25-2020

Quote:

Originally Posted by Young1

Then I started looking for one to no avail until Phil re invented the cam sensor.

Can you please expand on that one?

Young1 · 06-26-2020

Phil Wasinger is a brilliant engineer and I am using the prototype of camshaft sensor he developed 3 years ago. OEM or aftermarket ones are no longer manufactured. Do a search on this subject. There are a few threads.

My LT5 would just stop running. It would start right up again but I lost confidence on any trips out of town. Since replacement no problems.

billschroeder5842 · 06-27-2020

Quote:

Originally Posted by Young1

Phil Wasinger is a brilliant engineer and I am using the prototype of camshaft sensor he developed 3 years ago.

Thanks Steve-- I reached out to Phil.

Poussin · 11-11-2020

Quote:

Originally Posted by Young1

Phil Wasinger is a brilliant engineer and I am using the prototype of camshaft sensor he developed 3 years ago. OEM or aftermarket ones are no longer manufactured. Do a search on this subject. There are a few threads.

My LT5 would just stop running. It would start right up again but I lost confidence on any trips out of town. Since replacement no problems.

How can we contact Phil to buy sensor? I have same problem with my 90', engine stops, H31 code....

thank's

06-22-2020	#1
billschroeder5842 Join Date: Nov 2016 Location: Southlake, TX Posts: 584	ECM H31 code... momentary glitch or something on the horizon? I was out today and parked to run into the store. When I restarted my 91 I got a "service engine soon." I drove for about 100 yards, turned it off and restarted and the DIC was clear. I drove home with no other issues. I got home and pulled the codes. The car was clear except for the ECM module with a H31 meaning a "history" code for a cam sensor signal problem. The car has been running great with no problems and I know that sometime sensors have "moments" and can throw an intermittent code then "return to normal." But (for those with experience) is this a sign of a future problem, should I inspect and/or begin looking for a cam sensor? Thanks! __________________ Bill Schroeder Texas Proud! 1991 Corvette ZR1 #1388 2015 Challenger Scat Pack Shaker

06-23-2020	#2
billschroeder5842 Join Date: Nov 2016 Location: Southlake, TX Posts: 584	Re: ECM H31 code... momentary glitch or something on the horizon? I had a couple of on/off cycles today- no lights. I also ran the diagnostics again and nothing popped up. I think it was a momentary LOS (loss of Sh*t) __________________ Bill Schroeder Texas Proud! 1991 Corvette ZR1 #1388 2015 Challenger Scat Pack Shaker

06-25-2020	#3
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: ECM H31 code... momentary glitch or something on the horizon? Bill, Just watch for a while. If it recurs, might be starting to see signs of an aging cam position sensor or the weather pack connector may have an intermittent connection on the pigtail. Steve Sent from my SM-G950U using ZR-1 Net Registry mobile app

06-25-2020	#4
billschroeder5842 Join Date: Nov 2016 Location: Southlake, TX Posts: 584	Re: ECM H31 code... momentary glitch or something on the horizon? Thanks Steve- will do __________________ Bill Schroeder Texas Proud! 1991 Corvette ZR1 #1388 2015 Challenger Scat Pack Shaker

06-25-2020	#5
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 870	Re: ECM H31 code... momentary glitch or something on the horizon? My experience was intermittent codes then intermittent stop running when idling at a stoplight. Then I started looking for one to no avail until Phil re invented the cam sensor. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.

06-26-2020	#7
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 870	Re: ECM H31 code... momentary glitch or something on the horizon? Phil Wasinger is a brilliant engineer and I am using the prototype of camshaft sensor he developed 3 years ago. OEM or aftermarket ones are no longer manufactured. Do a search on this subject. There are a few threads. My LT5 would just stop running. It would start right up again but I lost confidence on any trips out of town. Since replacement no problems. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.