good deal. i had been thinkin, ya know, if its done it before loaded, and now unloaded....its GONNA do it again....let us know.

 

The way my luck runs........if I did it......it wouldn't fail. LOL

 

i tried to duplicate the problem on the way home and no dice.. but i wasn't on the same hill... no prob though.. that hill is only a few miles from my house...

 

hey guys... i was reading some things online about this... could this be the "limp" mode that the pcm triggers when it senses the tranny slipping...?

 

We can speculate a long time without the code.

 

true... i hope this isn't the problem.. but i wonder.. it only happens when i'm in overdrive... and it only happens when i am under load going up a hill at low rpms.... hmmmmm those would be the mostly likely time for a tranny to slip...

 

The tranny probably wouldn't leave a PCM code. It would likely manifest itself as a blinking OD light. Does it shift really hard when the power is down...like, snap your neck hard.

I'm wondering now if you aren't having problems with an injector harness or the IDM.

 

i have the sonnax kit, and the shifts are very firm... the only shift that is soft is when the torque converter locks up.. under acceleration the tc is a little sluggish but it is a stock tc with 94k on it...

if it is a problem with a harness or the IDM, (what is that?), why does it only happen under specific conditions... wouldn't a harness problem occur at different times, you know, it would just happen whenever...?

 

one other thing... a tech post that i read said there was a pcm code associated with a blinking od light and the code meant the pcm sensed the tranny sliping and went into "limp" mode... that's why i posted one of my previous questions after i read that..

 

the code on that post was a "P1728"...

 

Does that code look familiar? The "PCM" codes are P0603, P0605....down in that range.

IDM is injector driver module....and it would be intermittant like a harness, but might also be susceptible to external electronic interference. The only reason I mentioned it is because of the amount of power loss....like a bank of injectors shut down or something. Any sort of "normal" defueling situation you don't experience a power loss, it just levels off at that point.

 

that's why i was wondering if this is a "limp home" setting... it isn't a regular defuel, and i don't think it's a bank of injectors loosing power... this is definately "load" related... that's what makes me wonder about the tranny code...

 

Well, like touchofgrey said, it's all guesswork until we get that code again. I don't know enough about the transmission electronics to make a SWAG.

 

i'll post on this thread tommorow... i'll spend some time and see if i can get the code, and i'll watch the o.d. light to see if it blinks... that code does look familar... i think that might be the code that came up... i hope not though.. i don't have the money for a new tranny... have a good night..!

 

I don't know what your code is yet, but my thoughts and results may interest you.
Can a double boost relief valve not working correctly? Can it be blowing off too much boost all at once showing much less psi all of a sudden at the MAP sensor so you have a sudden loss of performance, or can it not blow enough boost to cause defueling. For me, I switched out my BRV for a ITP boost regulator which works perfect on their stock setting but is also adjustable. Now I only get the P1211 code, which is a code Diablo can't get rid of and is normal for their tuning, whereas before I got a couple more other codes P0238, P0478. This all using the Predator on 100hp running empty.
I also think the Predator still uses a lot of the OEM safeguards to protect the engine and us, like the speed limiter to match the speed ratings of our tires. For me at WOT on a roll at 80mph, it goes like crazy up to 30psi and starts to defuel at 90mph to 15psi and maxes out at 100mph. Whereas the chips I heard, can be programed to bypass these controls altogether. But I'm keeping my Predator just to keep me and my engine on the safe side.