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09-27-2021
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#1 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Random stall when coming to idle
So I have been fighting with a stalling issue. If I am coming to a stop, I usually put it in neutral and coast as I slow down. Every once in a while, the car will stall. Just drop out. It will restart and be fine, usually for the rest of the drive. Just not sure where to look next.
I have: New O2 sensors New injectors New coils New wires Plugs are about a year old New fuel filter Phil's fuel regulator I don't seem to have any vacuum leaks Fuel pressure is solid Outside of the stall when coming to idle the car runs great Thoughts on where to look next?
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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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09-27-2021
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#2 |
 
Join Date: Jan 2009
Location: New jersey
Posts: 156
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Re: Random stall when coming to idle
possibly the idle control motor?
could been old or could just be dirty. John |
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09-27-2021
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#3 |
Join Date: Aug 2015
Location: Pittsburgh, PA
Posts: 152
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Re: Random stall when coming to idle
What are your IAC counts at idle?
If you are much higher than 10 it suggests your throttle is closed too much and you are relying on the IAC to keep the car from stalling.(Yes the IAC regulates idle speed but the min. throttle hard stop setting should be high enough to keep the car running just below idle rpm target with 0 counts.) I went through this last month and followed the procedure by XfireZ51 here: http://zr1.net/forum/showthread.php?p=261060#post261060 Have not had a problem since.
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Roger 1990 ZR-1 #2699 Black on Black 15,000 miles Full-time secondaries, 4.10 gears, C-beam plates, ported top end |
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09-27-2021
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#4 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Random stall when coming to idle
IAC was swapped with no change. I did the IAC procedure a couple times. I may need to go through it again but IAC counts are 10 or less fully warm (no AC)
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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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09-28-2021
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#5 |
 
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,095
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Re: Random stall when coming to idle
Jeff, you might check with Marc or stop in to see him. I had this stalling problem shortly after he did his 510 package on the '95 and as I recall he just made a minor adjustment to the throttle cable at the front of the engine. I may be wrong, as it was several eyars ago, but that is what I recall.--Bob
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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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09-28-2021
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#6 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Random stall when coming to idle
Thanks Bob,
I have been chatting with him as well.. it happening less now.. time Will tell
__________________
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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09-28-2021
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#7 |
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Join Date: Sep 2018
Location: Florida
Posts: 305
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Re: Random stall when coming to idle
MAP line all clear? This was what stalled mine under the same conditions you?re describing.
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09-28-2021
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#8 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Random stall when coming to idle
Quote:
__________________
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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09-28-2021
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#9 |
Join Date: Sep 2016
Location: Ocala, FL
Posts: 900
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Re: Random stall when coming to idle
My car did than when the camshaft position sensor was bad. Check for codes. I think it is 31?
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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. |
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09-29-2021
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#10 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Random stall when coming to idle
Quote:
__________________
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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