A bad map tho would bring the whole shebang down. Maybe drive it once with it unplugged?

 

The MAP can shut er down like that?

 

No boost would defuel and I would bet it would affect DC .

I would check the hose and wiring a bit and maybe take a drive unhooked.
That boost number is low when read through a possible bad map !?!?

Just spitballing here.

 

I will start by saying that I did not read through all of the issues you're having. I'll have to go back through that when I get home. I'm driving right now, I just wanted to throw a couple things out there.

Gearhead tunes will give you a flatline reading on the MAP at high boost pressure. I forget where my SD flatlined, but I remember mine flatlining and preventing me from checking my boost to drive pressure ratio. My Wildman tunes allow the MAP to read higher, but my Wildman tunes will trigger an overboost code while the Gearhead tunes do not.

As for the MAP dropping all of a sudden, that could be a bad map sensor connection or a bad MAP. Would have to unplug and see if the issues smooth out.

Has the IPR has been replaced or cleaned?

Is that datalog at WOT? You might want to check TPS % or TPS voltage along side those readings. If the TPS voltage drops and then comes back it will make the PCM command less ICP. Then again it should also drop pulsewidth as well, but those pulsewidth readings are not correct. You should be seeing 2.5-2.8ish ms at WOT, not 0.2-0.3.

 

Following, I was wondering about those pulsewidth reading also. And a bad IPR will dump your HPO. Seems I remember Barney, I believe having a problem and changing his LPOP, but don't quote me on that its been a while.

 

No, its not. I can't get over 2400ish psi with it. No matter which of 4 hot tunes I run it in. It seems to just stop around there. It's already been out once and sent back. Today they are getting a not so happy phone call from me.


My pulsewidth reads the same way on my AE. It shows .44 on a WOT run. On my scangauge, it shows 4.4



Andrew, I'd check out your map like suggested then get ahold of gearhead.

 

Yeah, that's sure what it looks like from the data logs as well. The chip isn't loose (on the PCM) is it?

Edit: I went back through and looked at the graphs again, and it does look like MAP dumps first. The duty cycle and HPO pressure numbers just don't look right to me though. It just seems odd the way the pressure fluctuates while the duty cycle continues to climb.

I agree that unplugging the MAP does no harm to try and then I'd send those logs off to your tuner. All of this combined with the lazy running truck when cold sounds to me like a bad tune, though.

 

Thanks for all the replies guys, super helpful!!

Seems after some more specific searches and reading that the OBS's cant defuel per say, but the MAP can get confused/messed up at higher boost and send erratic signal to PCM.

IPR has not been replaced or cleaned, but I do have new orings for it. Just didnt want to add a new variable when I knew it was functioning before.

The data log is regular throttle, until 3rd hit and then full. I tried to get TPS to come up but couldnt find the function on AE, weird I'll have to try harder.

Pulsewidth reads this way on AE, its actually 3.0 on the interceptor gauge.

Thanks Darin. I think you guys are all on the right track, read below!

Fairly certain the chip is snug. Nothing like this happens anytime other than Full throttle in 3rd.

I think you guys may be on to something. I called gearhead. They said that the frequency output of MAP on OBS trucks is tough to deal with, and they cant really write it out because it would cause driveability issues with altitude changes and such. That said, some info I came across suggested that the MAP sensor dosnt like getting rammed with more than 30 Ibs of boost, and when it does, it gives irratic signals PCM, which can cause the hiccups. Some MAP sensors are more sensitive to this than other (age, mileage, whatever). So going to get the truck lit up tonight and do a few runs with MAP unplugged. If bucking goes away, then I guess I need a boost fooler for that issue.

Then the HPO issue will need to be addressed. As I mentioned before, I wasnt really expecting to have the T500 killed by stage 2's, but also not willing to live with 1900 either...

Thanks again guys, I'll post back.

-Andrew

 

I wasnt meaning defuel so much as if the map was not telling the pcm the boost reading then if the pcm saw no boost that it would automatically cut fuel back. But if gear head does not use map...how would the pcm fuel correctly in relationship to amount of boost? I would see that not working...but what do I know I'm not a tuner.they know much more.

 

I, too, am surprised that you are running out of oil, but it sounds like you may have a different issue that is causing low ICP.


What did gearhead suggest you do about MAP sensor being over pressurized? I've often wondered if a guy could make a device that reduces the boost seen by the MAP sensor by a known ratio, so that a tuner could make an adjustment that could provide cleaner power.

 

I wouldn't worry too much about the HPO until you get the MAP issue resolved. Funny readings from the MAP can make the PCM do weird things.

 

Gear head does use the MAP, that is the issue. He says they can not just cut it out becuase it would cause issues for the truck going to different elevations and such. But it seems when the MAP sensor gets crammed with way more boost than it is supposed to, it starts getting messed up and does weird things.
Read it here
https://www.ford-trucks.com/forums/1...ost-huh-2.html

 

FWIW Andrew, I have a boost fooler on mine, and had that bucking with it. NOT saying the map isn't part or most of your problem, just saying..

 

I have not found a need for a boost fooler on my truck fwiw. I have also found it weird that the t500 runs out of oil on others setups. I know hybrids use less oil than others, but I have yet to throw a code for low oil.

 

Gabe, you saying that made me think of something, I may be way off, but would oil viscosity have anything to do with running out of oil or not running out of oil?