pecosbilly

This might be helpful. After changing the injectors, I'd accidentally swapped #6 & #8 plug wires. When attempting to start, it backfired! Backfire might have caused partial or full plugging of the catallic and/or one or both of the cats. Thoughts?

pecosbilly

Tomorrow I'm pulling the catallic and will attempt to get it to run on 8!

aklim

Possible, anything is possible. That one backfire must have been huge enough to plug the cat since it would have to break the honeycomb or melt it. So I doubt it.

aklim

If you are going that route, just disconnect it for a quick test. Don't make it permanent especially if you are in the nutstate of CA.

pecosbilly

My engine backfired when #6 & 8 plug wires were accidentally switched, hasn't run on 8 since. Will start, run for a couple of seconds, then shuts off. Fuel pressure at shrader is 45lbs +-, will run on 6 connected injectors, but not 8. Suspect backfire caused problem, but I don't believe in coensidences...Changed to new injectors prior to the accidentally switched plug wires/backfire. Therefore either backfire caused problem or new injectors are the problem. If nothing from backfire caused the problem, then the injectors are.

Cliff Harris

All 8 injectors are connected in parallel. That means that if one is shorted you will get the symptoms you describe. Try measuring the resistance of the injectors and see what you get. They should be around 16 ohms and all of them should be about the same resistance. Sometimes injectors will work OK when cold but then fail when hot, so getting good readings when cold is not definitive proof that the injectors are OK.

pecosbilly

Thanks, I think I checked them before (been over 2 years trying to solve this problem) but I'll check them again. Where does the wiring to the injectors originate? Could a 'short' in one or more cause this problem?

catso

Wow, I've read 5 pages of this thread and nobody has solved their problem. Wish I knew what the OP did; sounds like he got rid of the car.