Question for all of you- When you stomp on the gas pedal, do you get immediate throttle reponse, or does your engine exhibit a split second of hesitation before winding up? I just noticed this hesitation last night when I was sitting at a red light and was playing around with the throttle.

Sound that I hear during the split second of hesitation is like a 4 barrel sucking air when the throttle plates are snapped wide open....

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1999 F150 4x4, wedgewood blue, 5.4l auto, Manick brush guard, Duraliner, KC Hilites, surf rod holders, tinted windows, K&N air filter without airbox, Velocity air intake tube, Midas Performance muffler with dual pipes, toolbox, Uniden CB with whip and now, enjoying a new reprieve on life with a 2000 series 5.4L (swapped engine due to Piston Slap).

 

Nope.... no delay here stomp my throttle only gets you the sound of my BFG's going up in smoke, and the engine racing towards a wot up shift. Superchips rule

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*2000 blk xlt f150
*5.4 4x4 3.55 ls
*sc orp pkg
*tow pkg, 17 inch wheels
*herculiner,remote start
*flowmaster, air box mod
*bfg ko's A.R.E. cap
*sony 10 disc cd player
*k&n air filter
*superchip

****mods to come*********
harley davison hitch reciver plug.
removing stock cab steps& installing westins.

 

This is a hard one to answer, because it's about "time", and how much is a bit. If you put it in Neutral or Park, you can bang the pedal to WOT and back without the engine picking up many rev's, if you're quick enough!

 

I ahve a superchip, but I can't get my tires to chirp let alone smoke them! I also have a slight hesitation. Wonder why?

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1999 F-250LD 4X4 XLT Supercab, Short Bed, 5.4L, AT, 3.73LS, 33"Wrangler ATS, Custom Dual Exhaust, Custom Air Intake, Superchip, Factory Step Bars, Tinted Windows, Vent Visors, Diamond Tool Box & Bed Rails, Color: Harvest Gold cc "Ready to Farm"

 

Funkster,

That LS doesnt help smoking the tires neither. Mine will do it *when it feels like it*.

 

WJT, The hesitation sounds similar to the problem that I had with my 4.2L. What was causing my truck to hesitate is that the CPS (Cam Position Sensor) had been mounted 180 degrees out from what it should have been. The CPS plays a part in controlling the injector timing. Don't know if this helps you, but it might be something to check on.

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Michael
99f150@pickupman.com
mkrieger@mailcity.com
99 F-150 XLT Supercab, 4x2, Bright Red/Harvest Gold, 4.2L, Automatic, 3.55LS, 255/70R16 Goodyears, Captains Chairs, Keyless Entry, CD Changer, Tow Package, Engine Block Heater

Accessories: SuperChip, Donnelly Compass Mirror, Lariat Wheelwell Moldings and Bumper Cap, Ford Splash Guards, Bug Shield, Bed Mat, WeatherTech Deflectors, Mobil1 Synthetic Oil

Modifications: Painted Tailgate Handle, A/C on/off switch

 

I realize that the limited slip doesn't help. The rear axle has to allow for the slippage and send torque to the other side. With my old truck, It was nothing for it to atleast chirp the tires. Grant it I had a 400M, but I only had 3.54LS with 33" tires. I now have 3.73LS with 33" tires, but not even a chirp! The part I don't understand is if these motors are suppose to have so much torque available at the lower end, then why won't they atleast be able to break traction better? From a dead stop my truck seems alittle doggy, like my dad's Powerstroke, but once it gets going- lookout!!

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1999 F-250LD 4X4 XLT Supercab, Short Bed, 5.4L, AT, 3.73LS, 33"Wrangler ATS, Custom Dual Exhaust, Custom Air Intake, Superchip, Factory Step Bars, Tinted Windows, Vent Visors, Diamond Tool Box & Bed Rails, Color: Harvest Gold cc "Ready to Farm"

 

funkster,
Don't panic about not being able to loose the tires. Those tires are pretty sticky, not to mention the fact that you have a lot more weight on the back than before. Fords aren't light.
My head still snaps back when I punch the accelerator, even though there is little complaint from the tires.

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'99 Lariat Supercab 4x4 SS
5.4L, 3.73 Diff (9.75" LSD Rear, 8.8" Front)
ORP: Skid Plates, LT265/70R17 GY Wrang. AT/S
Group III towing: HD Electrical/Cooling, GVWR 6500# (Extra leaf spring).
Step Bars
4W Disc anti-lock brakes
K&N filter
Stock Items That Differ Across F150s: Steel Driveshaft, Oil filter bolted to engine w/ drip guard, 4R70W transmission.

 

I'd like to point out a flipside of this topic, that my 4.2 hesitates at DEceleration. it matters most when shifting, i had to develop a slow clutch pedal attack after letting up the gas, or the engine was revving too high. the slow-mo makes close situations even closer. it's even more noticeable when i'd get into my wrangler & letting up the gas early caused me to nose-dive. doink...

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'99 F-150 XL 4x4 Sport Silver V6 5spd LS 120wb SS 60/40 ConvGrp Hooks Skids A/C AeroCover LouisvilleSlugger TweetieBirdAirFreshener