Dads 03

6speedsd · Jan 7, 2013

Finally got a chance to hook my AE up to my dads 03. No dtc's which was odd considering my X3 showed codes for both cam and crank sensors, as well as a contribution code. Anyways, checked the basics. FICM voltages were spot on, ICP actual vs desired stayed consistent. Here is where I'm stumped. I set the rpms to 2000, clicked the box, and the truck only idled up to 1100-1200. No more. If I set it to 750, it jumped to 750 and held. No matter how high you chose, it won't idle up over 1200 rpms. I know the tach is working because it sweeps up through its range while driving. What would cause this? Only code that AE read was something about a "key in circut fault", or something along those lines. Don't remember the actual code.

Lassie · Jan 8, 2013

I have not been able to idle over 1200 with AE on any 6.0.

6speedsd · Jan 8, 2013

So maybe it's just how it is? I was thinking there might be an issue somewhere.

6speedsd · Jan 8, 2013

Come on now. Where are all the AE experts?

Lassie · Jan 9, 2013

I've called AE for assistance when I got AE....needed help with the power balance test. The reference line (0) that splits the graph is the RPM of the engine at the time of the START of the power balance test. If you need to run a power balance at a higher RPM, find another way to maintain steady revs where you want them (a brick against pedal if you have to) and START the test. The AE power balance test needs a steady desired rpm because the reference wont float.

Anyway, back to my point, when I called AE for help, I talked to the Engineer who actually designed the power balance test! Their customer service was unlike any company I've ever dealt with. He was an arrogant a$$, but he is very sharp and helpful, so I'll give him a pass. You'll get as much detail as you want, and then some! Try it

6speedsd · Jan 9, 2013

I wasn't trying to do a power balance. Simply trying to set the rpms higher so i could look at different things, only to find out that it wouldn't. But I understand what you are saying about performing the power balance.

I'm basically just trying to understand if this is an issue with AE, or if its happening because of an issue with the truck.

Big Angry Hillbilly · Jan 9, 2013

You cannot command a 6.0 truck over 1200 even with IDS.

webb06 · Jan 10, 2013

Big Angry Hillbilly said:
You cannot command a 6.0 truck over 1200 even with IDS.

True fact. Idk why you would need anything higher

6speedsd · Jan 10, 2013

Ok, like I said, I just wanted to know if it was normal, or if I had an issue somewhere. Thanks for clearing that up for me.

I stated that he has had codes for both cam position and crank position sensors. He bought a new crank sensor but we haven't gotten around to replacing it. He has a long crank time on cold start. When it does fire, it runs for a couple seconds and shuts off. Another long crank, fires over then shuts off. Usually after 2 or 3 times it fires and runs just fine at idle. No missing popping sputtering. Gets a little dark smoke once it fires over but that's just a small puff. Also has what feels to be a dead miss when a load is on it, like going up a hill in OD. But AE never read a miss.

I read somewhere that if either of those sensors were faulty, IPR wouldn't allow over 300 psi. At idle IPR was like 600ish I think.

6speedsd · Jan 10, 2013

Also ficm never drops below 48V, so that isn't an issue.

Lassie · Jan 10, 2013

Is his EGR valve still there? Stuck closed valve can act like this.

Lassie · Jan 10, 2013

And if you're watching the FICM voltage on a diagnostic tool....it still hasnt been checked. The signal is filtered too much. Check cold engine with meter.

6speedsd · Jan 10, 2013

No egr. All been deleted. And I have checked with a meter directly off ficm by hand. 48V from key on to running.

Lassie · Jan 10, 2013

The starting issue may just be a GPCM. A failure is pretty common.

What's IPR duty cycle when idling? To find loaded misses, I typically power brake and hold that RPM with a cold engine. Watch Trans temps if you do this.

6speedsd · Jan 10, 2013

I don't remember honestly. I'll have to look at it again next time I'm at his place. I know idling desired vs actual stayed really close. There might have been 15-20 psi difference between the two. Is that close enough, or does it need to be almost identical?

6speedsd · Jan 10, 2013

Is there a way to test GPCM?

Big Angry Hillbilly · Jan 10, 2013

Crank and cam sensor codes can be set by a stall or excessive crank time.

I will post a couple more things for you to look at when I'm near a computer.

6speedsd · Jan 10, 2013

Sounds good. Thanks!

I'm still learning, so all these suggestions and tests help the process.

Lassie · Jan 10, 2013

IPR duty cycle is a way to diagnose hpop system health. The more open the IPR has to stay to maintain desired ICP, the more worn the system (assumed). It should stay in low twenties, and really healthy would be high teens. That is, with a warm engine.

There are other threads with GPCM troubleshooting with much detail. Check the easy stuff while waiting for BAH to give you more. Check fuel pressure, low pressure oil at filter, etc. and post all details. These guys will get you fixed if you give enough info.

6speedsd · Jan 10, 2013

I'm still learning how to use AE completely so I'm sure there are plenty of things I'm not checking with it, or even know what I'm seeing with what's being read. I need to find someone local that knows the ins and outs of AE to sit down with and teach me about it.

I live an hour away from dad, so ill have to check things next time I'm out that way.

I'm assuming AE won't read fuel or oil pressures correct? I know I can read fuel pressure off the filter housing. Just have to get some hardware to hook up the gauge I have.