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09-05-2020
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#1 |
 
Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,141
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Re: 1990 ZR-1 ECU got super hot while idling, white smoke appeared
What I originally thought was that the fusible links are directly below (pretty much) under the ECM but since you said the ECM housing was hot, I didn't mention them.
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Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454 |
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09-05-2020
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#2 | |
 Join Date: May 2017
Location: Grapevine
Posts: 56
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Re: 1990 ZR-1 ECU got super hot while idling, white smoke appeared
Quote:
Yes, that damn black box was very hot, like it came out of the oven! Always learning something new with this creature. Still love it. Typical, huh? |
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09-06-2020
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#3 | |
 
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,153
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Re: 1990 ZR-1 ECU got super hot while idling, white smoke appeared
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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09-07-2020
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#4 |
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Join Date: May 2017
Location: Grapevine
Posts: 56
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Re: 1990 ZR-1 ECU got super hot while idling, white smoke appeared
Guys,
Have an update with good news! The root cause was water trapped in the latch area where the hood posts lock into. Apparently, previous owner siliconed over the weep hole, so if water gets in the latch area, it has nowhere to drain, but spill over. When I pulled into my garage, I drive onto my lift and it "bumps" the car, spilling water on the electrical post that sits directly behind the battery causing the smoke (or vapor). Either way, the water splashed down onto the electrical post where the fusible links connect and gave off a strong electrical odor. I wrapped the wires in electrical tape and then put some A/C insulation around the terminal and fusible links to better shield it from water. Big thanks to Mark Haibeck for responding to me initial email. I thought I had an ECU problem, and thankfully, that wasn't the issue. Also, want to recognize Bill Schroeder for being a friend and calling me up about the water issue, BINGO! Got lucky on this one! |
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