My 2005 F150 5.4 doesn't like when I'm trying to pass someone @ highway speed. I press the accelerator and the engine feels like it shuts off for about 3 seconds then 'catches up' and I'm able to pass. Response time just stinks. I know it's a truck, not a sports car... would a custom tune correct this?

 

Any properly written tune can fix this .. IF it's simply the conservative OEM calibration for the ETC and TQ Management.

IF it's mechanical or electrical in nature, and/or a maintenance issue, then no.

 

Thanks MGD. As far as I know there are no underlying problems mechanical or electrical.

 

Hey.

For best results, for little or no additional cost, over generic canned device, consider a custom-tuned X3 from www.vmptuning.com.

Good luck.


MGD

 

I had a bad hesitation with my 2005 and the tuner eliminated it.

 

Even if it doesnt fix the hesitation, and there is another issue, you will not be dissapointed with the feel of a custom tune, made a world of difference on my 01

 

That is an issue.....check the TPS, IAC, etc.

 

This is an issue, but it's resident with the PCM software, for the ETC system. Hence the need for a tune calibration revision to address it.

BTW - a 2005 5.4 does not have an IAC. However, it does have Three (3) 'TPS' sensors (APPS 1, APPS 2, APPS3)

 

I don't know if TPS and IAC etc would produce a code, but my scan gaugeII isn't showing any codes.

 

Hi.

As I said, you have no discrete hardware IAC - the ETC system incorporates this function in software.

As for TPS errors, it almost always results in a Failsafe condition ( PCM is constantly sanity-checking the output of the three APPS sensors)- and believe me, you'd know it as there will be no power, AND a CEL

 

I have an 06, it has never driven with any hesitation at any speed...... with an ECM EFI system, there should never, ever be any hesitation, missing, etc at any speed.......
I can go back to my 1990 F150/5 speed (EFI) that had a part throttle hesitation upon delivery...it took the dealer, Ford and AAA dyno in Long Beach to ID the issue.and secondly, I built an EGR restrictor plate which absolutelt eliminated 100% of the hesitation.

 

Keep in mind ( in addition to what was posted above about the IAC ) the 2005 MY truck does not have the same TPS as used with the IAC.

There is a solid state Electronic TPS ( TP1 & TP2 ) in addition to the Electronic Throttle Control Module ( APP1, APP2, and APP3 ) ( 2005 EVTM cell 24-6 ), so no more DVM TPS adjustment BS.
Any clown suggesting you look for an IAC on a 2005 My truck might be the same clown that would tell you to look for a GEM also.

Dumb question, when was the last time your cleaned you MAFS / IAT module ?
The only reason I ask, is I have seen several symptom descriptions with this solution. Not too sure if it really as the fix or not.

Depending on the PCM code revision you have on your truck, there could be several software fixes from 2005 to 2006, let alone to current.

 

Just cleaned MAF with CRC cleaner. Holy Cow! Could not reproduce the hesitation/missing issue! I almost didnt spray down the MAF because it looked clean.. but figured what the heck I have it out... glad I did. Thanks Sscully

 

Thank BlueJay, he is one I first saw this from.

As far as I know, he is the source of this little nugget of info

 

Having same issue again..... 25 mph 'roll' and then accelerating it misses and sputters....

http://youtu.be/LXYXzHFELrw