LB7 running issue help please

[rollincoal1417]

okay, so for about a week and a half ive been experiencing some issues with my truck. it happens under wot. when i go to roll into it the truck loses all steam and like takes the throttle away and takes about 3-4 seconds for the power to come back and start pulling again. then it shifts into 3rd and pulls then when it reaches 3k rpm it doesnt shift and just sits there even though i still have it wot. im so confused on what is happening. ill post a video of it happening any advice would greatly help me. i know in my sig it says edge programmer but the truck has been stock now for a few days and problem hasnt gone away. maybe a fuel issue? not enough rail pressure or maybe a sensor?????

 

[tractor]

Put your edge back on and read the code it is throwing if you still have it.

 

[rollincoal1417]

okay ill try it tomorrow but if i remember i dont think it threw any code. there was a code about glow plugs but thats irrelavant to my issue. thanks

 

[rollincoal1417]

http://www.youtube.com/watch?v=VZmtRnS9Sgw
when i initally roll into it is in 2nd gear and starts to pull then when it reaches 2600 rpm it stops pulling and drops but i dont take my foot off the pedal its still wot. then it starts to pull again shifts to 3rd then when it goes to shift into 4th it stops pulling at 3k rpm and sits there for a few seconds and taking forever to shift into 4th.

 

[TheBac]

When was the last time you changed out the fuel filter? Could be clogged.

You may have also limped the transmission but I havent looked at the video to tell.

 

[blk smoke lb7]

When was the last time you changed out the fuel filter? Could be clogged.

You may have also limped the transmission but I havent looked at the video to tell.

Beat me to it Tom,this is what it sounds like to me also. but like Darryl said you should get the codes read so we have more to work with.

 

[dracing70]

It sounds as if rail pressure is falling off but ? Try returning it to stock again with the edge. Maybe the tune did not get pulled out completely . had his happen in the past with other box tuners. Lb7 ecms are fragile.

 

[rollincoal1417]

The truck is stock tune and I pulled two codes with the edge.
P0380 - glow plug/heater circuit A
P0802 - transmission control system MIL request circuit
Im not sure what the trans code means. Ill take a look at the fuel filter to see if it is clogged
Thanks guys

 

[rollincoal1417]

And its like a hit and miss problem sometimes it doesnt occur sometimes it does. If I hurt the tranny wouldnt it happen all the time?

 

[dracing70]

Are all of the connectors that u have disturbed,properly plugged in. Make sure u did not bend any pins

 

[rollincoal1417]

what connectors are you referring to?

 

[blk smoke lb7]

He is probably refering to the bale connectors that you connect to the edge and then disconect when you took it out.If those pins vet pushed back or bent over it would make no conectiion and code possibly.

 

[rollincoal1417]

okay so today i hooked my scanner to it and drove it observing the fuel data and noticed that when i got the truck to act up falling on its face the actual fuel rail pressure dropped to like 20 mPa and desired stayed around 160 mPa. the dramatic drop in rail pressure what would be causing that. and it took a couple times of WOT pulls for it to act up and fall on its face. i believe 20 mPa is around 2,900 psi and 160 is around 23,200 psi. idk if the fuel pressure regulator or relief valve is acting up or an issue with the CP3. any ideas anyone?
thank you

 

[03_DMAX]

did you change the fuel filter?

 

[rollincoal1417]

im about to do that just to eliminate the chances of that being the issue but i would assume if the fitler was dirty it would do it all the time not only sometimes