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What gives?

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Old 12-06-2017, 05:22 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

What gives?

I recently changed my ECM. Before I did, my instrument cluster worked fine; after I did, engine ran hot, and tachometer & temp gauge read high. Any ideas?
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Old 12-06-2017, 07:13 PM   #2
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Re: What gives?

Considering the ECM doesn't control the gauges, it's either not related or not an instrumentation issue.
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Old 12-06-2017, 08:56 PM   #3
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Re: What gives?

Does the fan(s) run OK? The '91 V6 ECM and the '91 TPI ECM both control the engine cooling fan.

RBob.
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Old 12-07-2017, 01:48 AM   #4
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Location: Des Moines, Iowa
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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: What gives?

Opened hood with engine hot; fan not working or working intermittently. What's the fix?
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Old 12-07-2017, 07:43 AM   #5
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Re: What gives?

Another ECM.

RBob.
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Old 12-07-2017, 10:35 PM   #6
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Re: What gives?

Wonder if the terminals on the new cluster are all clean, especially the grounds.
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Old 12-08-2017, 01:13 AM   #7
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Join Date: Oct 2010
Location: Des Moines, Iowa
Posts: 141
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: What gives?

Quote:
Originally Posted by MrPackstin View Post
Wonder if the terminals on the new cluster are all clean, especially the grounds.
Cluster was working fine, before ECM was changed.
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