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#1 |
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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Did a bit of searching but wasn't seeing anything quite following my symptoms (many related to dieing at idle, cold or warm, or running rough).
Have a 1990, last drove it maybe 4 weeks ago and went to take it out today. Started right up like normal, pulled it out and left it idling while moving stuff around. Got back in the car and then it died at idle (hadn't fully warmed up yet), thought it was weird but it started right back up and ran smooth. Pulled out got a couple miles down the road and died again. Some cranking, then started again. Died about 6 times in a 2 miles loop getting it back home, each time happening after a shorter run time. When running it runs very smooth, not noticeable issues. When it dies, the tach stays right around where it was, if you push gas it does/goes no where, and once you let off it dies and drops to 0. It doesn't fire right off, sometimes takes some cranking. About 1500 miles ago I replaced to single fuel pump, new injectors, new spark plugs, and replaced some vacuum lines. Since then it's always run great. I will assume all other parts are original to the car. Any common issues or quick things to check? I'm thinking cam or crank sensor. Is there an ignition module? Any help is appreciated. |
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#2 |
![]() Join Date: Aug 2014
Location: Chantilly, VA
Posts: 37
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Maybe a new fuel filter?
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1990 black on black #1042 - sadly - sold 1993 Ruby #140 - stock 1991 QB #1608 - heads and top end ported, Watson headers, B&B 3"exhaust, Haibeck chip, 4.10 gears |
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#3 |
![]() Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,067
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Or fuel pumps? --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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#4 |
![]() Join Date: Jul 2017
Location: West Chester, PA
Posts: 378
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I suppose I'd start with pulling codes.
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1990 Black/Black ZR-1 #1155 1993 White/Red coupe (Regrettably sold) ![]() |
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#5 |
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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Installed a new wix filter at same time as fuel pump, so less than 2k miles. Also brand new pump sock and hanger assembly.
I'll still plan to add fuel pressure monitoring to my trouble shooting list. Has a new single Walboro. After restarting the car there was no CEL present. |
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#6 |
![]() Join Date: Feb 2010
Location: Ochlocknee, GA
Posts: 435
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I had this same problem last year on way to National Corvette museum. On I-75 north in Georgia. Cruising along at 75 mph fuel pressure drops, pull over called AAA for tow. After setting for awhile at auto shop I was able to restart car. At this point I decided to go back home ( The Villages ). Car stalled 3 more times by the time I got home.
After checking I was able to isolate the cause of the failure. Fuel pump relay# 1 would lose power at times. Using the 8A section page 8A-22-6. That relay controls fuel pump relay #2 Replace fuel pump relay #1( 20 plus years old ) and car started right up. No guarantee that this might be your problem, but it gives you something to look at. Hope this may help you. John 1990 white/black # 2546 one of a few 4l8OE eq ZR-1's |
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#7 |
![]() Join Date: Aug 2006
Location: McLean, VA
Posts: 3,712
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About 1500 miles ago I replaced to single fuel pump, new injectors, new spark plugs, and replaced some vacuum lines
When you say single fuel pump, you mean modified pump running on one pump? |
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#8 | ||
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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![]() Quote:
Quote:
https://www.zr1.net/forum/showthread.php?t=33899 |
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#9 |
![]() Join Date: Aug 2006
Location: McLean, VA
Posts: 3,712
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I used the Flyman pump assembly, you end up removing/isolating the 2nd pump wiring.
Just wanted to make sure that you had a factory two pump set up and replaced one pump or had a new single pump set up. OEM dual pump set up will run fine until magic coolant temp and stall out if the primary pump has gone bad Sind secondary pump turns off. We can rule this one out. |
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#10 |
Join Date: Mar 2021
Location: Crawfordville, FL
Posts: 216
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Another suggestion - You didn't run out of gas did you?
Happened to me once when the gauge read about 1/8-1/4 full and the car died at a stop sign but started right up again and I drove home for about 5 miles with no problem. I was looking at the gauge but it turned out the tank was empty, and after filling it up with gas it never happened again. Added a bottle of Techron a couple of times with fill-ups to clean off the gauge and it seems more accurate now. Or you can remove the pump and clean off the gauge yourself. Being aware of your trip mileage in between fill-ups is another way to avoid this. May not be your problem, but just another thought. |
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