90 ZR1 Randomly Dies
 

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.

Re: 90 ZR1 Randomly Dies
 

Maybe a new fuel filter?

Re: 90 ZR1 Randomly Dies
 

Or fuel pumps? --Bob

Re: 90 ZR1 Randomly Dies
 

I suppose I'd start with pulling codes.

Re: 90 ZR1 Randomly Dies
 

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.

Re: 90 ZR1 Randomly Dies
 

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

Re: 90 ZR1 Randomly Dies
 

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?

Re: 90 ZR1 Randomly Dies
 

This is a very interesting thought and would be a pretty easy check, thanks!

I used the Flyman pump assembly, you end up removing/isolating the 2nd pump wiring.

https://www.zr1.net/forum/showthread.php?t=33899

Re: 90 ZR1 Randomly Dies
 

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.

Re: 90 ZR1 Randomly Dies
 

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.