Gas pedal sticks/air sound when idle

[bobbyperu]

When first going from park to reverse or drive the gas pedal somtimes sticks. Any ideas or suggestions? Also you can hear a hissing air sound when in idle but when the gas pedal is applied it goes away. Ive been told the air sound is normal but I dont remember it( ive only had the truck for 2 weeks). Thanks for any help!

 

[X24]

If I had to guess, I would say you have the V6 SOHC. That hissing is normal for them (at least thats what the ford mechanic said).

 

[bobbyperu]

Good Guess! Everyone tells me its normal I just didnt notice it at first. it is not really loud just constant. Thanks for the help. Any ideas on the gas pedal?

 

[X24]

im not really sure what you mean by sticks. do you mean that when you step on it nothing happens or it is stuck down?

 

[Campo]

Mine had a slight hissing sound when I got it, but I got worse when I put the K&N drop in and cut the airbox . it's normal ( from what i've read from this board) .. My throttle cable was sticking, but I just sprayed the area really good with some TB cleaner (while I cleaned the MAF and TB) and I haven't had any problem's since then..

Hope this helps..

 

[Mark Drysdale]

The hissing sound isn't normal, there is a recall on SOHC Xs, to replace the throttle body, with one that doesn't hiss or stick.

 

[Alec]

The hissing is from air passing your throttle body, and the gas pedal is sticking cause the TB is sticking as was mentioned. Sounds like the TB needs to be cleaned or lubed, or taken in for the recall if there is one for your model year.

 

[X24]

I had my TB replaced as part of the recall and I still have that hissing noise. I dont think my pedal has ever stuck before.

 

[Robert]

The hissing sound could be one of two things. One thing that could cause it is leaking lower intake manifold o-rings or a leaking IAC gasket. Back when mine were leaking I had a distinct hiss sound in the engine compartment that could only be heard when idleing with the hood up. Eventually I got a check engine light and had the o-rings replaced. The shop that did the work said that my IAC gasket was leaking as wells so they replaced it also. When I got it back the hiss was gone. I do not know which of the two was the cause for the hiss, but the leaking o-rings caused the CEL. Ford has extended the warranty on the o-rings to 6 years/72K miles. The other thing that can cause it is the shape of the intake/throttle body combination. Ford issued a technical service bulletin regarding it. They described the noise as cosmetic and poses no problems. They did develope a fix however. The fix is to install a 2" long flow straightener between the intake hose and the throttle body. This is supposed to eliminate the hiss. Ford will not do it for free unless you are still under warranty. I haven't had a need to have it done since mine doesn't hiss so I don't know about its affectiveness.

The sticking throttle is due to the throttle body. Ford issued a recall on the throttle body in 10/00 due to them sticking closed on initial application. The throttle body should be of a certain revision. Ford will replace it at no charge if yours is the old style regardless of whether or not you are under warranty. Here is the beginning text from recall # 00V422000: Throttle Body Sticking

"Sport utility vehicles equipped with 4.0L SOHC engines and still retain the original throttle body (Part Numbers 97JF-9E926AB or 97JF-9E926-AC). Some of the original throttle bodies installed allowed a gap between the plate and bore to be built too narrow. This reduced clearance allowed the engine deposits normally present in the throttle body to contact or bridge the gap. If the engine deposits bridged the gap between the throttle plate and bore and then hardened, on the initial application of the accelerator pedal after the engine has cooled, the operator would need to apply additional force to the accelerator pedal to break the bridge."