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09-26-2021
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#1 |
 Join Date: Mar 2016
Location: Pittsboro,NC
Posts: 22
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Engine quits after 7 minutes
Hi guys, when I cold start my 91 ZR1 she runs for approximately 7 minutes(warm up time) then shuts down. After that she starts right up for 6 seconds and shuts down. When she completely cools down I can start the whole process all over again, any thoughts?
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09-26-2021
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#2 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Engine quits after 7 minutes
good chance its O2 related its moving from open loop to closed loop, when its under 160 or so degrees it runs off a pre determined startup program, when it warms up it moves to running off the 02 sensors, and if they or the wiring is bad it will go rich or lean ... killing the car. I would bet if the car starts to stall and you gun the motor it comes right back because its going back to open loop
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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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09-26-2021
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#3 |
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Join Date: Mar 2016
Location: Pittsboro,NC
Posts: 22
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Re: Engine quits after 7 minutes
Thanks I'll try that.
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09-26-2021
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#4 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Engine quits after 7 minutes
Scan tool would help ID the problem
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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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09-26-2021
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#5 |
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Join Date: Mar 2016
Location: Pittsboro,NC
Posts: 22
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Re: Engine quits after 7 minutes
I'm not getting a check engine light and I'm not of a scan tool for OBD 1's. I do have a MaxiDAS DS808 reader with an OBD 1 adapter but still doesn't see anything.
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09-26-2021
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#6 |
 
Join Date: Dec 2003
Location: Arcadia, OK
Posts: 3,392
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Re: Engine quits after 7 minutes
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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09-26-2021
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#7 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Engine quits after 7 minutes
Quote:
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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09-26-2021
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#8 |
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Join Date: Mar 2016
Location: Pittsboro,NC
Posts: 22
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Re: Engine quits after 7 minutes
I thought so also and replaced both fuel pumps and filter but still the same result.
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09-26-2021
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#9 | |
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Join Date: Dec 2003
Location: Arcadia, OK
Posts: 3,392
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Engine quits after 7 minutes
Quote:
Have you tested rail pressure for each, individual pump at rail, since replacement? Also verify primary pump fuse. Sent from my iPhone using ZR-1 Net Registry
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 09-26-2021 at 03:02 PM. |
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09-30-2021
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#10 |
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Join Date: Mar 2016
Location: Pittsboro,NC
Posts: 22
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Re: Engine quits after 7 minutes
Hi guys, back in town, checked the fuel pressure she is steady at 40 to 42 psi even after she shuts down. I put her up on the lift and the O2 sensors and wiring look good and intact. i also seem to have a vacuum leak because my secondary injector vacuum pump won't stop running.
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Hybrid Mode
