Now, I think I have fuel back to the injectors, but the intake heater is not working. When I turn the key on, the wait to start light comes on like it should, and goes off after a few seconds. But, the heater is not working.

I checked that I have 12 volts going to the relays. That is OK. Also, the blue wires that go to one of the terminals on each coil are hot when the key is on, like they should be. But, I don't know how to check any farther. From my diagram, the other 2 wires, that go to the other coil terminals, go straight to the PCM.

Anybody got any ideas?

 

It sounds like you may have a bad intake temp sensor. If memory serves me correctly, the intake temp sensor sends a temp sense back to the PCM. If the temp is below 46*F the PCM will then send a signal to both relays to turn them on.

To check your temp sensor, take a multimeter and ohm accross the 2 sensor pins. At room temp, the resistance should be 800ohms and at 32* it should be 2000 ohms. The easiest way would be to put it in a cup of ice water (32*) and check your resistance.

 

So, if the outside temp is above 46°, does the intake heater not operate at all? If that is true, maybe what I am seeing is normal, because it was above 46 in my garage. But, I don't see how it is going to start at 46 with no heat at all. Two weeks ago, when I got it running, it was warmer than it was today, and I could tell it needed heat then. When it was trying to start, it would pop on a couple of cylinders as soon as I started turning it over, but if I kept on winding on it, it wouldn't do anything. I had to turn it off and back on, then try again.

 

46 Degrees isn,t a problem if the battery is up to snuff. It was 22 degrees this morning when I first cranked over my tired 1958 Ford diesel tractor. It rolled about five or six revs, coughed and started. My Dodge fires right up at 22 degrees, even when I don't wait for the "wait to start light" to go out.

 

Dang, that seems amazing compared to my past experience. I wish I had had this truck long enough to know how easily it handles cold starts. Then I could tell if it was normal or not.
But, the diesel that I have the most experience with is the '82 Toyota that I had. If that little joker hadn't already been running that day, it was just flat not going to start without glow plugs. It didn't matter if it was high noon in the middle of the summer in the Sahara desert. But I know that not all engines are the same. My neighbor's backhoe will fire right up if its above about 60°. I just don't have enough experience with the Cummins to be able to judge it.

 

The intake heaters are more of an emmision control than a starting aid. Before I fixed mine, I successfully started it unplugged at 17 degrees. Where you live it will never get cold enough that the Cummins won't start on its own, intake heaters or not, plugged in or unplugged.

 

I'm having a different problem with mine right now. Looks like PCM or a signal being sent to the PCM is funky. But my dad did a successful start at 5* in NY state without intake heaters. I think it was colder than that during the night though. Took three different trys to keep it running, but it started.

 

what Wannadiesel said. same start without anything. no intake heater. no plug in. started died started and kept running. the cummins starts like no other.