Still running rough[emoji35][emoji30][emoji19] - ZR-1 Net Registry Forums

thestrawhead · 04-16-2023

After replacing the cam positioning sensor that I got from Jagpanzer on the registry(thank you!) my 90 Zr-1 ran great and check engine light went off and code cleared. Then, shortly after it started running rough again. Tapped on the E.C.M and it ran smooth...for a short time. Had to limp it home, and it would not go into full power mode, regardless of where I turned the valet key. Can't find an E.C.M. for it. A guy said he would rebuild it for $600. Ugh. Not sure Bout then. Getting nickel and dimed to death lately with only 24k miles on it[emoji19]

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G8nightman · 04-17-2023

Try opening up the ecms cover and reseating the chip.

XfireZ51 · 04-17-2023

Quote:

Originally Posted by G8nightman

Try opening up the ecms cover and reseating the chip.

Do this ^. Check for codes with a code reader or short the ALDL pins. Turn ignition to ON position but Don?t Start. Does CEL light flash once? If it does, ECM checks out.

thestrawhead · 04-18-2023

Thanks!

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Young1 · 04-18-2023

First remove each of the colored connectors. Spray all with electrical contact cleaner. Reinsert. Next remove the small PROM cover. Remove the blue prom. Spray. Reinsert. Chances are good it is just a connection. Tug a bit on each of the wires to make sure they are connected well. Another option is to send it to Marc Haibeck for repair. Tapping it sure seems like a poor connection or just a failed solder joint inside. 35 year old parts need a little love. Be patient. Buying a 35 year old replacement can buy you just another set of problems.

04-16-2023	#1
thestrawhead Join Date: Oct 2022 Location: Avon Lake, Ohio Posts: 9	Still running rough[emoji35][emoji30][emoji19] After replacing the cam positioning sensor that I got from Jagpanzer on the registry(thank you!) my 90 Zr-1 ran great and check engine light went off and code cleared. Then, shortly after it started running rough again. Tapped on the E.C.M and it ran smooth...for a short time. Had to limp it home, and it would not go into full power mode, regardless of where I turned the valet key. Can't find an E.C.M. for it. A guy said he would rebuild it for $600. Ugh. Not sure Bout then. Getting nickel and dimed to death lately with only 24k miles on it[emoji19] Sent from my SM-G960U using ZR-1 Net Registry mobile app

04-17-2023	#2
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,188	Re: Still running rough[emoji35][emoji30][emoji19] Try opening up the ecms cover and reseating the chip. __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"

04-18-2023	#4
thestrawhead Join Date: Oct 2022 Location: Avon Lake, Ohio Posts: 9	Re: Still running rough[emoji35][emoji30][emoji19] Thanks! Sent from my SM-G960U using ZR-1 Net Registry mobile app

04-18-2023	#5
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 899	Re: Still running rough[emoji35][emoji30][emoji19] First remove each of the colored connectors. Spray all with electrical contact cleaner. Reinsert. Next remove the small PROM cover. Remove the blue prom. Spray. Reinsert. Chances are good it is just a connection. Tug a bit on each of the wires to make sure they are connected well. Another option is to send it to Marc Haibeck for repair. Tapping it sure seems like a poor connection or just a failed solder joint inside. 35 year old parts need a little love. Be patient. Buying a 35 year old replacement can buy you just another set of problems. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.