Hello,
I'm running out of ideas with my '93 B2600i, I bought it running but it was hard to start and it had no power when accelerating. It started getting worse and then to the point it quit and it would not restart? I ended up parking it for a few months. I then replaced the spark plugs, plug wires, distributor (old one was junk), coil, also rebuilt the ECU and I just replaced the coolant temp sensor. Before I got it someone else replaced the injectors, mass air flow sensor (used but it checks out ok) and then some other parts that I can't think of.

After replacing the ECU and Coolant temp sensor (old one check out bad) it now starts right up with out even thinking about it and then it runs for a couple minutes and then shuts it's self off. It doesn't even sputter, just like the key was turned off. There is no smoke out the tail pipe and there are also no noises or any other concerns. The pickup will not start again until it sits for at least 8 hours and then it does it all over again.

Tonight I pulled and tested the O2 Sensor and I believe it is bad. but I don't think it will cause my problem will it? I also tried starting it with the O2 sensor unplugged and it didn't do anything?

If anyone has any ideas please let me know, this little pickup is in really good condition otherwise.
Thanks for any advice.

 

I have replaced a ton of injector harness's. The harness has crimped connections that lose connection and pull too many amps resulting in a fried ECU. You need to figure out what it is losing. Spark/fuel pressure/fuel injector pulse.

 

It has spark when it quits, it also has goo fuel pressure. I'm going to check the injectors today
Thanks

 

The crimped wires go to the fuel injectors.