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What gives?

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Old 12-06-2017, 04:22 PM
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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, 06:13 PM
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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, 07:56 PM
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Car: check
Engine: check
Transmission: check
Re: What gives?
Does the fan(s) run OK? The '91 V6 ECM and the '91 TPI ECM both control the engine cooling fan.

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Old 12-07-2017, 12:48 AM
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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, 06:43 AM
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Re: What gives?
Another ECM.

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Old 12-07-2017, 09:35 PM
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Car: 1989 GTA
Engine: 5.7 w/Paxton
Transmission: 700R4
Axle/Gears: 3.27
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, 12:13 AM
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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?
Originally Posted by MrPackstin
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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