SalmonRiver1

Hey Folks, I'm having a big problem with my 88 3.0 4x4 p/u. For the last few days with some colder weather, she won't start. I've tested the CSI and it appears to be working properly. I think that the fuel injectors are not working as I crank the engine. By using starting fluid I got it to fire and run immediately. It starts and runs perfectly the rest of the day. I suspect that when it restarts, it is firing off on fuel that is in the cylinders at shut down. After sitting over night that residual fuel is evaporated. Is there a rpm related sensor that tells the ECU when to fire the injectors?? I may be way off in my reasoning. If anyone has any ideas about this I'd sure appreciate it!

Thanks,DD

TNRabbit

The cold start injector is usually the problem when you have cold starting issues.

SalmonRiver1

Thanks for your comment. I appreciate it! I ohm tested the CSI and it fell within the range. I also removed it and turned the engine over. I got a good spray into a bottle for about four seconds. That seemed like a reasonable amount of time. But, I just don't know. Thanks again.

BrownsfaninMN

...type in "Cold Start" in search, very common problem especially now that it's getting colder outside (see "cold start '91 P/U"). My suggestion is if you've removed your Cold Start Injector and you're getting good spray, get yourself a can of carb cleaner and spray a bottle into the hole that the Injector goes into, don't skimp. I had the same problem, purchased both the Injector and the Injector Timer ($300), same problem, did the carb cleaner, it starts every time, first crank (...I wish I would have done that first, allot cheaper). Carbon build up around the injector in the intake manifold... Give it a try and let us know if it works.

SalmonRiver1

Thanks for the tip. I believe I'll try it. There is build-up as it has about 240k on the motor.