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#11 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
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This is a Haibeck Chip fans on at 205... doesnt happen.. and the Tech one cannot turn them on in test mode...
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#12 |
![]() Join Date: Jan 2004
Location: Alex VA
Posts: 1,087
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I had similar gremlins in my old 87 turbo buick
I got tired of trouble shooting and rigged up a direct thermostat and called it a day I know that's kinda hackey for a zr-1, but it's cheap and works great and the fans and puter don't care.
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95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP) |
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#13 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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This turned out to be an issue with the Prom still waiting to see what the exact issue is with it, maybe the Prom is just bad. I was able to take a 90 Eprom and put it in the car, then use the Tech 1 to turn the fans on and off, that would not work with the 91 Eprom in the car.... and the ECM works fine in other ZR-1s
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#14 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
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So the chip tested on another 91 and worked fine:
So here is what I know so far: -91 ECM in 91 w/91 chip; fans do not turn on when temps hit 205 and fans do not turn on when commanded by a tech one(sometimes the will kick on for 1-2 seconds and right off). Fans do turn on when the tech one runs a diagnostic mode; so if you do an ECM check and pull codes So we know wiring, relays, and fans are good; as fans turn on for diagnostic mode. Ive also tested fans independently, and swapped in know good relays -If you put a 90 chip in the 91 car with 91 ECM, and tell the tech one its a 90 the fans can be commanded on and off by the Tech one to turn on -If you put the 91 ECM in a 90 ZR-1 w/90 chip the fans work when at 205 and can be commanded on by the ECM These tests repeat consistently and same results time and time again. Ive done these checks as well as reseated the prom 10-1t times each. Any thoughts, this is very odd... I have one wildcard this could be......
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#15 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
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So the conclusion is that there is something wrong w/ECM that seems to impact the 91 Chips and not the 90s... very odd. Had some videos of the tech one and the different chip results in same car/ECM but they wont load
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#16 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
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1991 Chip in 91 /w 91 ECM
https://youtu.be/SNCnaClA9go 1990 Chip in 91 with 91 ECM https://youtu.be/SNCnaClA9go
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#17 |
![]() Join Date: Jul 2007
Location: Bartlett, IL
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so apparently that ECM is now a 1990 ONLY?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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#18 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Lee,
Can take 1990 cal, copy it, and put in different prom or Ostrich. Then see what happens.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#19 |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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Does the Tech1 show fans requested (on) and they don't run? Pull the connector to the high a/c pressure switch just to see what happens.
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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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#20 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Hi, Makes no difference....
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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