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Old 02-24-2010, 10:15 PM
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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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Old 02-24-2010, 11:16 PM
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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.

Last edited by westcoaststrokin; 02-24-2010 at 11:19 PM.
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Old 02-25-2010, 05:12 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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Old 02-25-2010, 07:46 AM
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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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Old 02-25-2010, 02:10 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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Old 02-25-2010, 02:31 PM
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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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Old 02-25-2010, 02:34 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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Old 02-25-2010, 02:53 PM
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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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Old 02-25-2010, 09:44 PM
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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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