Tuning issue or Injector issue? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 11-01-2008, 04:25 AM Thread Starter
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Tuning issue or Injector issue?

After working a few bugs out, ive got about 75 miles or so of drive time on the new motor, and boy am i far from pleased. I dont know if i am just not used to a race truck, but this thing is NOT driver-friendly on the street! It isnt live tuned, i think that may be my problem. It has a very lopey idle, sometimes rolling between 450 and 1100 rpm just to maintain an idle. Sometimes it stalls out, regardless of being in gear or not... The engine will overpower normal brake pedal pressure at a stop and work its way out into the intersection if you aren't careful.. () Also my biggest gripe is when you are barely on the the throttle, just trying to keep speed, the power is either "on" or "off", it is extremely touchy, i feel i need to race it with 1/4 pedal, get 40mph above the speed limit and coast to the next turn. It doesnt matter the speed or engine speed it always does this. Is this something that live tuning will help with, or is it a issue about the nozzles being too big to not let the truck have a semi-decent idle?

Other than that, it kicks ass

Stock
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post #2 of 13 (permalink) Old 11-01-2008, 04:34 AM
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Re: Tuning issue or Injector issue?

Kris, are you still running the same tunes from the old engine?

Haven't you been LIVE tuned before?
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post #3 of 13 (permalink) Old 11-01-2008, 04:50 AM Thread Starter
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Re: Tuning issue or Injector issue?

No, im using Tony's tuning, and if you didnt already know, im running big hybrids with oil and fuel side mods, and pretty big nozzles.

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post #4 of 13 (permalink) Old 11-01-2008, 05:25 AM
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Re: Tuning issue or Injector issue?

i've tamed 200 percent nozzles... how big are yours? the lopey idle is due to the pw and volume fuel desired being out of wack... all tunable..

Matt Robinson
Gearhead Automotive Performance

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If you have nozzles that were Extrude honed over and over and over again. It will look like a porn stars ass.hole where the pintle is supposed to seal.
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post #5 of 13 (permalink) Old 11-01-2008, 05:29 AM
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Re: Tuning issue or Injector issue?

Sounds like you need some tuning adjustments.
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post #6 of 13 (permalink) Old 11-01-2008, 11:26 AM
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Re: Tuning issue or Injector issue?

This sounds EXACTLY how my truck was running as soon as I put the stage 2's in it. All the drivability symptoms you've described were the same as mine. I tried testing and replacing everything that I thought could have been screwed up after the install.... idm, pcm, UVC's, checked all engine wiring, swapped injectors around to different holes, tried 4 different chips from Tony.... it still tan the same. I was about to install stock injectors back in the truck after 3 weeks of mucking around with it because I figured it was my injectors and it was a lost cause, but before I did that I called Jody at DP to see what he thought. I had never done business with him, but thank god I made the call. He knew it was a tuning issue, and when I was describing the truck's symptoms to him, he was basically finishing my sentences, he knew exactly what had to be done with the tuning.

He sent me a chip with a few different tunes on it to try and see which ran the best and the second I plugged the chip in the truck ran MINT. I thought my truck was a lost cause with the stage 2's because of the way it idled and ran and romped and had the "on/off" pedal. Tuning fixed it. I had to go to DP in order to get the right tuning.

Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
SOLD
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New truck:
2009 F-350, 5.4L, 4" lift on 35's
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post #7 of 13 (permalink) Old 11-01-2008, 11:53 AM
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Re: Tuning issue or Injector issue?

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Originally Posted by PSDfan99 View Post
This sounds EXACTLY how my truck was running as soon as I put the stage 2's in it. All the drivability symptoms you've described were the same as mine. I tried testing and replacing everything that I thought could have been screwed up after the install.... idm, pcm, UVC's, checked all engine wiring, swapped injectors around to different holes, tried 4 different chips from Tony.... it still tan the same. I was about to install stock injectors back in the truck after 3 weeks of mucking around with it because I figured it was my injectors and it was a lost cause, but before I did that I called Jody at DP to see what he thought. I had never done business with him, but thank god I made the call. He knew it was a tuning issue, and when I was describing the truck's symptoms to him, he was basically finishing my sentences, he knew exactly what had to be done with the tuning.

He sent me a chip with a few different tunes on it to try and see which ran the best and the second I plugged the chip in the truck ran MINT. I thought my truck was a lost cause with the stage 2's because of the way it idled and ran and romped and had the "on/off" pedal. Tuning fixed it. I had to go to DP in order to get the right tuning.

thanks for sharing this..my DP chip is on its way back to me set up for SS stage 2's makes me feel better about doing the swap for sure..I don't have time for any down time..I need this to work first try..

good luck Kris..sounds like that truck is going to tare up some asphalt when she is running right..

Early 99 7.3 F350 auto,TN T-4 mount with a s467 for air,H-11's stud's SRP 1.1 for oil all supplied by unlimited diesel..beehives, DI push rod's, new alliant 315/200 hybrids,Driven diesel fuel system with a fuel lab 41401. ...tuned by Gearhead..
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88 F250 7.3 IDI plow truck 112k - bone stock.
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post #8 of 13 (permalink) Old 11-01-2008, 11:55 AM Thread Starter
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Re: Tuning issue or Injector issue?

Hmmm, thanks for the info.. Looks like im going to have to be giving tony a call here Monday...

Stock
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post #9 of 13 (permalink) Old 11-01-2008, 12:26 PM
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Re: Tuning issue or Injector issue?

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Originally Posted by PowerstrokeJunkie View Post
Hmmm, thanks for the info.. Looks like im going to have to be giving tony a call here Monday...
He said Jody


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post #10 of 13 (permalink) Old 11-01-2008, 12:29 PM
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Re: Tuning issue or Injector issue?

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He said Jody
I sure did. That phone call was the difference between a truck that runs and one that doesn't.

Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
SOLD
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New truck:
2009 F-350, 5.4L, 4" lift on 35's
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