The PCM may be commanding the alternator to quit charging during performance mode and that kills voltage to the fuel pump. The voltage booster can help for sure. My radio has a display mode for voltage on it that is digital. I can turn it on and watch the voltage during high RPM runs. A digital multimeter setup in the cab of the truck can show the same thing, watch for dropping voltage during WOT runs.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I have never heard of that before!Originally Posted by RedHeartbeat
I guess it will try to see if my Interceptor gauge tells me anything (because I am lazy and don't want to crawl under the truck).
Gone, but not forgotten!
I don't blame you, thats what lifts are for. Theres a rule at the shop no crawling or laying down under vehicles. We sit in chairs under cars/trucks and work!Thats lazy. Something else to check 2morrow SC?
30' Ford Model A Tudor Sedan - Custom chassis - Big bore LS2 - twin B76's - Glide - 9" w/ 3.07 gears - 30" DR tire - 2k lbs cruiser
I'm not sure if the PCM is setup to shut down the charging of the alternator or not during WOT runs. Its a load on the engine and only occurs intermittently so I would think that GM would do that to boost WOT power, just as they disable the A/C during WOT runs. That's why the PCM now controls the A/C and field wires in the alternator probably.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Update, the voltage shows 13.7-13.8 under WOT all the way up to shift @ 6,400 rpm.
Gone, but not forgotten!
Sounds great!
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
Good deal, in one sense. You're just running out of fuel now. Not sure if its the pump or a restiction in a line somewhere. Changed the fuel filter lately?
Last edited by RedHeartbeat; 02-15-2008 at 06:38 PM.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
When I put the pump on. Who's bright idea was it to put the filter in the tank anyway?
Edit: I just checked my records and I changed it in January 2006. Probably 20,000 miles ago, and 15,000 of that with the blower. Should it be changed again? If so, who wants to do it?
Last edited by SCIV; 02-15-2008 at 05:38 PM.
Gone, but not forgotten!
Look in your owners manual and see what your filter change interval is supposed to be. I think the voltage booster might be your next option if changing the filter doesn't fix it.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I have a Kenny Bell boost a pump if you are interested. I'll let it go cheap if you want to PM me a offer. Here is the thread when I bought it. I have never installed it. F/S Kenne Bell Boost-a-Pump - Page 2 - PerformanceTrucks.net Forums
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
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