Just pulled my map sensor, it's crystal clean, like brand new. Even wiped it on my white Tshirt and it didn't leave a mark. Glad to see it was sealed with an O-ring instead of a gasket. That would have sucked to tear/damage the gasket and not have anything to make another one with!

Oh, and found the problem with the overhead display, it's was a short between the seat and the steering wheel. The outlook monitor takes it's power from a piggyback spade that pushes in with the fuse for the overhead. Evidently I didn't seat the fuse well and it was only getting intermittent connection. Now if only my boost problem will turn out to be that simple.

 

Well at least you are making SOME progress towards this..

 

I've been seriously considering one of those OBDII to PC deals with the software so that I could chart and actively monitor on my laptop everything that is going on in hopes of catching what is happening as the computer decides I need limp mode. Of course the problem there is that I don't have a benchmark to compare to.

I'm used to "this BROKE" and simply finding what broke and fix/replace it. Throw a computer into the equation and you don't know if anything actually broke or not.

I'm glad this is a truck and not an aircraft. Limp mode = falling, NOT slow flying.

More update: Pulled the C-clip off the waste gate actuator rod and worked the waste gate open/closed. Absolutely no restriction. How much headache is involved in pulling the exhaust elbow between the turbo and downpipe? Maybe get a mirror and flashlight and get a good look in there, just in case. Diaphram/spring has alot of tension, too, takes a hell of a pull to get the rod to push towards the wastegate. If I understand correctly, the compression has to overcome the spring rate before the wastegate actuates? If so, the only way the wastegate is the problem, is if it is actually damaged and letting exhaust gas bypass in the closed position.

Intake is SUPER clean. From the filter to the manifold. I'm getting PLENTY of fuel, even with detuned to stock and programmer uninstalled. Where the HELL is my air going?!? I can't seem to put two and two together yet to figure out why I am not producing boost like i should. I am assuming that lack of boost to fuel input is my egt problem since a diesel produces it's heat in rich conditions as opposed to a gasser in lean conditions. I really hope I don't burn something up before I get it resolved. I'm thinking of installing manual boost guages at the turbo and at the manifold so I can 100% verify that i'm not loosing it somewhere in between. Gonna go back out and RE-install my boot onto the turbo and pressure things up again and wet everything with soapy water again.

I've got to be overlooking SOMETHING.

 

Maybe this stuff will help you a bit. Any progress?

The combination, dual function Intake Manifold Air Temperature Sensor/MAP Sensor (2) is installed into the top of the intake manifold.

The combination, dual function Intake Manifold Air Temperature Sensor/MAP Sensor is installed into the top of the intake manifold with the sensor element extending into the air stream.

The IAT portion of the sensor provides an input voltage to the Engine Control Module (ECM) indicating intake manifold air temperature. The MAP portion of the sensor provides an input voltage to the ECM indicating turbocharger boost pressure.

 

Just about need something to check sensor parameters. Cummins should have the software and hardware for it. If not, stuck spending $4600 for a Star Scan.

 

Don't know yet what to do with that info, but I am glad you provided it, did not know that it was also a air temp sender. Wish I could program my outlook to read that info. I'll have to look into that.

As for now, I haven't sat still long enough to recheck my intercooler and boots for leaks, or when I have, i've been so overwhelmed with my interior drywall project, that by the time i remember i need to play with the truck, it's too late and i'm too tired.

It's got to be something simple that I'm overlooking, or it's in the computer (via sender or other). Best I can see, there's nothing PHYSICALLY wrong. I'm just not producing boost properly even though the turbo is spooling up. Again, why I am REchecking the boots and intercooler. Now to get off my butt and go outside and deal with it instead of just clearing the codes and waiting for the fixall to fall in my lap.

 

You can check ground, your 5V supply to the sensor and your return voltage to the PCM with that schematic. That would at least tell you if the circuit or sensor is working correctly. You might find something there.

 

Ahah! That's what I can do with that information! Surely, sooner or later, that would have probably, most likely, maybe dawned on me. My gears are turning slow today. I think.

 

Did ya figure out what was wrong?

 

Closed.

Junkie can re-open the thread if there is still a problem