Hesitation when flooring the throttle
08-01-2011, 06:43 PM
#1
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Hesitation when flooring the throttle
Hey there. Ive got a 2007 fx4 screw. In general I love the truck. But there has been a few issues that are starting to pick at me. First, when flooring the gas pedal crusing at 30 to approx. 60 km there is a complete hesitation for a second and then the throttle pics up. Sometimes it happens a second time. Dealer said mas sensor may need to be cleaned. Not too sure. Almost feels like it hesitates to shift. Only happens with full throttle. 5.4 l engine. Second, the doors rattle.
Last edited by chrisbaxter; 08-01-2011 at 06:45 PM. Reason: not finished
08-01-2011, 07:00 PM
#2
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The issue of lag is caused by having the 5.4 under your hood… But seriously; mine felt that way too. I put exhaust, CAI and a Gryphon in and it completely changed the way the truck drives. I had a 6 speed BMW before this truck, so the throttle response of the 5.4 was really hard to get used to. I know there was a pretty good MAS airflow write up on here a couple of weeks ago if you want to look into the issues that he was having.
08-01-2011, 07:02 PM
#3
Hey there. Ive got a 2007 fx4 screw. In general I love the truck. But there has been a few issues that are starting to pick at me. First, when flooring the gas pedal crusing at 30 to approx. 60 km there is a complete hesitation for a second and then the throttle pics up. Sometimes it happens a second time. Dealer said mas sensor may need to be cleaned. Not too sure. Almost feels like it hesitates to shift. Only happens with full throttle. 5.4 l engine. Second, the doors rattle.
08-02-2011, 06:36 AM
#4
Uberhater,Troll,Whatever
A Gryphon fixed my 4.6L throttle response issues and helped with transmission shifting as well. The factory settings were rather lethargic. I have some door rattles but only on bumpy roads. I think it's just a drawback of not having a centerpost (SCAB).
08-02-2011, 06:37 AM
#5
Mark
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So...in short Chris $500 will fix that problem.
08-02-2011, 06:56 AM
#6
Moderator (Ret.)
Some have reported that they got rid of the lag by removing and cleaning the back throttle plate of the throttle body, using throttle body cleaner. This is a one hour weekend project.
Also, try the throttle adjustment trick. It's also been reported here that folks removed lag buy pressing the gas pedal to the floor, then letting it release. This is done several times with the ignition key in the "on" (engine not running) I believe.
Both of these are worth a try. A can of throttle body cleaner would set you back under $10.00, and the throttle adjustment trick is a freeby.
A whole lot less than a tuner, exhaust, and CAI.
Also, try the throttle adjustment trick. It's also been reported here that folks removed lag buy pressing the gas pedal to the floor, then letting it release. This is done several times with the ignition key in the "on" (engine not running) I believe.
Both of these are worth a try. A can of throttle body cleaner would set you back under $10.00, and the throttle adjustment trick is a freeby.
A whole lot less than a tuner, exhaust, and CAI.
08-02-2011, 07:24 AM
#7
'08f150stx
Also, try the throttle adjustment trick. It's also been reported here that folks removed lag buy pressing the gas pedal to the floor, then letting it release. This is done several times with the ignition key in the "on" (engine not running) I believe.
The throttle calibration; Start with the truck off. Turn the key on, do not start just have the key in the ignition on position. Slowly depress the gas pedal all the way to the floor (remember I said slowly, real slow). When you press the throttle all the way to the floor, take you foot off the pedal. Then turn your truck off. Repeat this procedure 2 more times. Then start her up and drive normally for a few miles. That should have calibrated the throttle. Freebie like Bucko mentioned above!
Clean your MAF too. That will cost you the price of a can of MAF cleaner. Don't use anything else!
The throttle calibration; Start with the truck off. Turn the key on, do not start just have the key in the ignition on position. Slowly depress the gas pedal all the way to the floor (remember I said slowly, real slow). When you press the throttle all the way to the floor, take you foot off the pedal. Then turn your truck off. Repeat this procedure 2 more times. Then start her up and drive normally for a few miles. That should have calibrated the throttle. Freebie like Bucko mentioned above!
Clean your MAF too. That will cost you the price of a can of MAF cleaner. Don't use anything else!
