ECM failure multiple times
07-18-2018, 05:28 PM
#1
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Car: 1991 Camaro RS yellow
Engine: was '91 V6, now '89 5.7/355 TPI
Transmission: 4 speed automatic
Axle/Gears: Moser 3.73 with zexel posi
ECM failure multiple times
My fourth ECM in the last year has gone bad. Where can I get a good one? I'm told they go bad from "sitting on the shelf" for 26 years.
Or: What could be ruining ECMs one after the other?
Or: What could be ruining ECMs one after the other?
07-19-2018, 04:36 PM
#4
Senior Member
Re: ECM failure multiple times
Unlikely the ECM given so many have "failed". If a '7730, they're virtually indestructible. I've inadvertently done so many bad things to them electrically but they keep on ticking. I'm with ULTM8Z and would look elsewhere.
07-19-2018, 10:32 PM
#5
Supreme Member
Re: ECM failure multiple times
Your first step is to identify what exactly is "ruined" in each of the ECM's.
If we accept the proposition that the ECM's are being ruined, the likely culprit is excessive voltage and/or excessive amperage being dumped into the ECM via the aftermarket wiring harness and collection of aftermarket engine-accessories.
If you can identify the harness pin that is delivering the death-blow, you will have some direction where to look for the culprit.
If we accept the proposition that the ECM's are being ruined, the likely culprit is excessive voltage and/or excessive amperage being dumped into the ECM via the aftermarket wiring harness and collection of aftermarket engine-accessories.
If you can identify the harness pin that is delivering the death-blow, you will have some direction where to look for the culprit.
07-26-2018, 10:19 AM
#6
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Car: '88 Formula, '94 Corvette, '95 Bird
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Re: ECM failure multiple times
Your first step is to identify what exactly is "ruined" in each of the ECM's.
If we accept the proposition that the ECM's are being ruined, the likely culprit is excessive voltage and/or excessive amperage being dumped into the ECM via the aftermarket wiring harness and collection of aftermarket engine-accessories.
If you can identify the harness pin that is delivering the death-blow, you will have some direction where to look for the culprit.
If we accept the proposition that the ECM's are being ruined, the likely culprit is excessive voltage and/or excessive amperage being dumped into the ECM via the aftermarket wiring harness and collection of aftermarket engine-accessories.
If you can identify the harness pin that is delivering the death-blow, you will have some direction where to look for the culprit.
-- Joe
07-26-2018, 10:24 AM
#7
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Car: 1991 Camaro RS yellow
Engine: was '91 V6, now '89 5.7/355 TPI
Transmission: 4 speed automatic
Axle/Gears: Moser 3.73 with zexel posi
Re: ECM failure multiple times
Working on it. . . .
I've heard that all 3rd gen ECMs (and all Chevy of that era) are the same. Is this correct? Does a 350 V8 require a dedicated ECM?
I've heard that all 3rd gen ECMs (and all Chevy of that era) are the same. Is this correct? Does a 350 V8 require a dedicated ECM?
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07-26-2018, 10:54 AM
#8
Re: ECM failure multiple times
Not all the ecms are the same. The memcal determines what’s application it’s for 305,350 ect.
I don’t know what application your dealing with you said 350 so I assume it’s tpi.
90-92 uses a 1227730 ecm and 86-89 uses a 1227165 ecm.
I don’t know what application your dealing with you said 350 so I assume it’s tpi.
90-92 uses a 1227730 ecm and 86-89 uses a 1227165 ecm.
07-26-2018, 03:49 PM
#9
07-26-2018, 03:51 PM
#10
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Car: 1991 Camaro RS yellow
Engine: was '91 V6, now '89 5.7/355 TPI
Transmission: 4 speed automatic
Axle/Gears: Moser 3.73 with zexel posi
Re: ECM failure multiple times
Your first step is to identify what exactly is "ruined" in each of the ECM's.
If we accept the proposition that the ECM's are being ruined, the likely culprit is excessive voltage and/or excessive amperage being dumped into the ECM via the aftermarket wiring harness and collection of aftermarket engine-accessories.
If you can identify the harness pin that is delivering the death-blow, you will have some direction where to look for the culprit.
If we accept the proposition that the ECM's are being ruined, the likely culprit is excessive voltage and/or excessive amperage being dumped into the ECM via the aftermarket wiring harness and collection of aftermarket engine-accessories.
If you can identify the harness pin that is delivering the death-blow, you will have some direction where to look for the culprit.
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