Need help asap! Truck stumbles at high rpm - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 8 (permalink) Old 07-26-2013, 04:09 AM Thread Starter
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Need help asap! Truck stumbles at high rpm

I just installed a stage 2 stealth hpop on my truck...well now driving it once I get the engine good and hot it will stumble upon hard acceleration. like as soon as I get into it and turbo starts to light it then "stumbles" I cant figure out what would be causing this, need some input.

THANKS

P.S.- this is not the truck in my sig. its another one with large injectors and large turbo

2002 F350 Lariat, CrewCab, Short Bed, 6spd
BDP custom chip, afe intake, 4" downpipe-5" exhaust
6.5" lift, 20" wheels with 37x13.50 Toyo Open Country M/T's in the winter and 38x15.50 toyo's on 20" chrome in the summer
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post #2 of 8 (permalink) Old 07-26-2013, 04:15 AM
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Re: Need help asap! Truck stumbles at high rpm

You have a scan tool? Or any way to monitor ipr DC, & hpo pressure?

'96 F-250 SCLB 4x4 Auto
3.5" dp 4" duals
Stealth dual hpop
Annd BIs on stock tuning.
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post #3 of 8 (permalink) Old 07-27-2013, 02:37 AM Thread Starter
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Re: Need help asap! Truck stumbles at high rpm

no I do not. also I was told a stealth pump requires different tunes? I had my chip programmed for an srp1.1 but since then I got a stage 2 stealth and im not sure if that would make any difference or not

2002 F350 Lariat, CrewCab, Short Bed, 6spd
BDP custom chip, afe intake, 4" downpipe-5" exhaust
6.5" lift, 20" wheels with 37x13.50 Toyo Open Country M/T's in the winter and 38x15.50 toyo's on 20" chrome in the summer
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post #4 of 8 (permalink) Old 07-27-2013, 03:29 PM
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Re: Need help asap! Truck stumbles at high rpm

I had a similar problem with an early pump, call Gary and chat with him about it.

2013 ccsb 4x4-stock
99 ccsb 4x4- built to the hilt, wife's DD!
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post #5 of 8 (permalink) Old 07-27-2013, 03:44 PM
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Re: Need help asap! Truck stumbles at high rpm

I wonder if its suckin the hpo reservoir dry for a second? I would take Luke's advice and call gary
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post #6 of 8 (permalink) Old 07-27-2013, 05:12 PM
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Re: Need help asap! Truck stumbles at high rpm

I think I'm gonna start making the recommendation of a good scan tool being a requirement BEFORE any mods above stock injectors are bought.

02 F350 CC DRW 4X4.
PHP Hydra with Gearhead, PHP, and NLTD tunes. AIRAID INTAKE, 4" exhaust.
CTS INSIGHT w/ egt, coolant and boost sensors.
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RIFFRAFF Hrx & Frx.
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post #7 of 8 (permalink) Old 07-27-2013, 08:12 PM
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Re: Need help asap! Truck stumbles at high rpm

You may need to ad some lines to that pump.
If that is the large billet single pump.
Ps army has some pics of this done with dual pumps.

Early 99 f350 4x4 crew cab, auto. pmt2 pcm
2001 cup holder ,T500, MAX AC ASSIST AC mod, Diy Twin tymar, TS chip, Powerslots & Hawk pads, ford AIC, ..... with big fat want to list.
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post #8 of 8 (permalink) Old 07-28-2013, 05:18 AM Thread Starter
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Re: Need help asap! Truck stumbles at high rpm

ok guys thanks for the input...even though I didn't get to see it all till now haha

I called gary this morning and we talked for about 20 mins doing some theory, with what we came up with I did some testing with a mechanical gauge to see what was happening.

before I had even gotten to test the pressures Gary called me back and told me that if I found the pump to be the issue he would get me a loaner to get me going for this week as I have a pull on Saturday. I must say I am very impressed with stealth and their product support, Gary is an excellent guy to talk to and will do all he can to help you out.

so back on topic, I foung icp to be 3300-3500 when it was "stumbling" so I tried different things to further determine what was happening. finally I unplugged the icp sensor and took it for a drive, truck ran excellent and peak pressure was 2500psi since it was limited to factory default...at 2500 psi the needle held solid no matter what. I am very impressed with this pump and with my diagnostic work I had determined that my tuning is the issue. as before I had stock pump and tunes were set to run a high duty cycle which is now causing this large pump to make too much pressure for the injector to handle. so my next step is sending a chip to get tuned to further get things dialed in. and as of now worst case scenario I can simply unplug my icp to pull as it will hold a steady 2500 psi.

Thanks again guys for the input, im relieved to have found the problem so easily. next will be bigger injectors that will utilize all that oil!!!

2002 F350 Lariat, CrewCab, Short Bed, 6spd
BDP custom chip, afe intake, 4" downpipe-5" exhaust
6.5" lift, 20" wheels with 37x13.50 Toyo Open Country M/T's in the winter and 38x15.50 toyo's on 20" chrome in the summer
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