90 ZR1 Randomly Dies

[fastpace]

Originally Posted by mlipmd

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.

Another good and unique suggestion. I had just below half a tank because I remember thinking I was about to be 15 mins early for where I was going and thinking I might just stop to top off to waste time. My gauge is quite accurate and I installed a new sending unit with the pump replacement.

I'll be back home and have some time to play with it this weekend so will have the chance to test the relay and will also hook up a few pressure gauge while it idles.

[-=Jeff=-]

Randomly dying with not codes. I would check the crank sensor. They tend to crack then get oil and leak and cause issues.

[viper107]

did you check for codes OR COMMUNICATION with ecm, is the ecm communicating with all sensors?

[Young1]

I agree with Jeff. Also mine randomly died before the camshaft sensor code appeared. Some rough running and firing happened before the crankshaft sensor died also. I think these two sensors time out from age.

[Bristowb1]

Any Updates?

[fastpace]

Originally Posted by Bristowb1

Any Updates?

Once it finally cooled down in Houston, I got the chance to troubleshoot it some. I quickly saw I wasn't getting consistent fuel pressure. Tracing the electrical, I ended up finding that one of the pins for the fuel pump connecting to the bulkhead on the inside of the sending unit had backed out of the connector. I converted to a single pump not too long ago and I guess the pin wasn't fully seated in the connector or the tang inside the connector was damaged. It was making intermittent contact and then eventually no contact. I went ahead and replaced the connector body and it's been trouble free for a couple months and several hundred miles now.

[WARP TEN]

Originally Posted by fastpace

Once it finally cooled down in Houston, I got the chance to troubleshoot it some. I quickly saw I wasn't getting consistent fuel pressure. Tracing the electrical, I ended up finding that one of the pins for the fuel pump connecting to the bulkhead on the inside of the sending unit had backed out of the connector. I converted to a single pump not too long ago and I guess the pin wasn't fully seated in the connector or the tang inside the connector was damaged. It was making intermittent contact and then eventually no contact. I went ahead and replaced the connector body and it's been trouble free for a couple months and several hundred miles now.

Glad you figured it out! --Bob

[tiegsd]

Originally Posted by fastpace

Once it finally cooled down in Houston, I got the chance to troubleshoot it some. I quickly saw I wasn't getting consistent fuel pressure. Tracing the electrical, I ended up finding that one of the pins for the fuel pump connecting to the bulkhead on the inside of the sending unit had backed out of the connector. I converted to a single pump not too long ago and I guess the pin wasn't fully seated in the connector or the tang inside the connector was damaged. It was making intermittent contact and then eventually no contact. I went ahead and replaced the connector body and it's been trouble free for a couple months and several hundred miles now.

Good news. Will put that in the bag of tricks.