Lag from dead stop - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 02-24-2010, 11:15 PM Thread Starter
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Lag from dead stop

I am having bad throttle response. Earlier today, I put it to the floor to get out in traffic, and the truck simply would not move. It was like this for about 3-4 seconds and then picked up. It seems like there is about a 1-2 second lag from a dead stop to actually accelerating according the the pedal position.

I do know that the truck was chipped before. I also know that Ford put the truck ECU back to factory specs. I dont know how long ago it was.

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post #2 of 9 Old 02-25-2010, 12:16 AM
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to a turbo diesel.

They are dogs until the blow dryer lights off. The best is to roll into the throttle.

Josh

04 F350 CC SB DRW IT HAS SOME STUFF

"Idiopathic, from the Latin meaning we're idiots cause we can't figure out what's causing it." House M.D.

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post #3 of 9 Old 02-25-2010, 06:12 AM
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it is also possible your turbo might be starting to stick internally. you will have some lag but 4 seconds is excessive. pull codes and see if you have any stored. if you have any codes relateed to the turbocharger (P0299 most common) then I would start there
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post #4 of 9 Old 02-25-2010, 08:46 AM Thread Starter
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Quote:
Originally Posted by fordmasterdieseltech View Post
it is also possible your turbo might be starting to stick internally. you will have some lag but 4 seconds is excessive. pull codes and see if you have any stored. if you have any codes relateed to the turbocharger (P0299 most common) then I would start there
I'll see if I have anything pending. I doubt the previous owner cleared the entire monitor history, so there may be something there.

When I drove my buddies 06, it seemed to have much better throttle response. Granted he has a turboback exhaust (similar to mine but no high flow muffler), and a tuner on it. Would putting a tuner on it help with the throttle response, or is this lack of response just a nature of the beast?

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post #5 of 9 Old 02-25-2010, 03:10 PM
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That much lag indicates a problem... what fordmasterdieseltech said or perhaps a sensor issue (MAP sensor, perhaps). The trouble codes will point you in the right direction.


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post #6 of 9 Old 02-25-2010, 03:31 PM Thread Starter
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Its not throwing any DTC's right now. It may have in the past but not now.

I just realized that it lags the most when in the morning at first startup. Once it heats up and has been driven for a while, the lag will go to almost nothing. Still there a little bit, but only from a dead stop to a WOT position.

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post #7 of 9 Old 02-25-2010, 03:34 PM
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cold it will have some lag, these diesel engines are cold blooded animals. if it clears up when the engine warms a bit, then I wouldnt worry about it. keep an eye on it. the dealer can run diag on it, perform a turbo boost test and vvt test, also check over your map, maf sensors to make sure they are running fine. just an option
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post #8 of 9 Old 02-25-2010, 03:53 PM Thread Starter
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I'll take a look at them. I recently got the ford manufacturer books with wiring diagrams. So I should be able to perform the tests on it w/o a problem (Assuming I have the right tools)

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post #9 of 9 Old 02-25-2010, 10:44 PM Thread Starter
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Today I noticed that when she got warm, or at least when the turbo warmed up, it spooled quicker. Much quicker and had a better response.

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