Inconsistent Throttle Response - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 05-28-2011, 09:38 PM Thread Starter
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Inconsistent Throttle Response

I keep experiencing inconsistent throttle response, some times it takes very little throttle to make the truck accelerate quickly and sometimes I seem to have to give it much more throttle to accelerate at the same rate. I donít ever get any hesitation, jerking or anything that makes me think thereís a real problem with the truck. Under wide open throttle it seems to always run the same. It seems that itís most always more responsive when cold and the lagging throttle response is mostly noticed once the truck is up to operating temps. but thatís not always the case.

Iím running the SRL+ tune on the truck and have 4Ē straight pipe. I didnít dive the truck long enough stock to remember if it did this before.

What does the throttle directly control? I know like a normally aspirated gas engine you have a throttle plate that regulates air flow then fuel is electronically controlled by the mass air flow sensor and computer but there is no mass air flow sensor or throttle plate here? I have a temp sensor in the intake but no MAF.
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post #2 of 7 Old 05-29-2011, 10:18 AM
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i would guess its the tune but not sure. might try and turn it back to stock and go from there might think of goin with an sct tuner
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post #3 of 7 Old 05-29-2011, 03:47 PM Thread Starter
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Quote:
Originally Posted by Mingof350 View Post
i would guess its the tune but not sure. might try and turn it back to stock and go from there might think of goin with an sct tuner
I'm running a SCT tunner using a custom file from Gearhead automotive, the SRL+ which seems to be one of the top 3 best choices on this forum from what I've gathered. I have some other files I may try for awhile and see though.
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post #4 of 7 Old 05-29-2011, 04:17 PM
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oic well guess you can try the other tunes c what happens
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post #5 of 7 Old 06-08-2011, 12:50 AM Thread Starter
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post #6 of 7 Old 06-08-2011, 01:03 AM
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I doubt its the tunes, and that tune in particular. Could be a number of reasons for the inconsistancy you describe. First and easiest would be to check the fuel filters, then work a C&I on the EGR valve, then turbo (if you think you may have some vanes sticking.) Before we get into those clean and inspects, do you have a FP gauge on the truck, or have you installed the updated FPR spring for good measure. Sometimes FP dropping out could cause it.
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post #7 of 7 Old 06-08-2011, 01:57 AM Thread Starter
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Have the updated fuel pressure regulator spring but no fuel gauge. I cleaned the turbo back in January and got rid of the EGR system at that time as well. Will be changing the fuel filters in the next couple K miles.
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