Accelerator Stuck? Whoa Nelly..Help!

[V8killR4U]

Well I was out in my car, doing some tuning last night. I get on it a lil bit and everything is ok. I let off the gas and the car keeps accelerating, well not exactly increasing speed but stuck at around 3000 rpm and im coming onto traffic quick with my foot on the brake and the car still reving at 3000 rpm. I I see the rpm's are not coming down and look for a side street up ahead. I ride the brakes and turn the key off and coast onto the side street, i was a little nervous about that whole deal. I pull over pop the hood and its kinda dark, no flash light :frown: I dont really see anything turn the car over and it fires up and the rpms go up to about 3k, i turn the car off, I toggle the accelerator from the TB get back in the car and start it up and idle is normal I decide to try and make it home and keep the r's under 3 k. I hit it a lil bit when im close to home and sure enough its like its stuck again. Any idea what this could be the car was running fine the hour or so i was driving it and nailing it, accelerator never stuck? I did blow the intercooler hose off at the TB right before my car got starting acting funny. Any idea on what i can check?

 

[SPOT MY 6]

What do you mean "its like its stuck again"? Is the throttle plate stuck or not? Did you look under the hood when you got home to see?

If the throttle plate is in fact not closed all the way, look at the spring that closes the throttle plate. Is it broken? Is there anything obstructing the movement of the throttle cable linkage or throttle plate arm?

 

[BlackBandit]

I would check the hose clamp for the intercooler hose on the throttle body. If it's not positioned correctly the clamp can interfere with the throttle. Just an idea. james

 

[scottyb]

Take off the up-pipe and inspect the TB for debrit and it's operation.
If ok, then unhook the cruise cable. Check travel/binding/operation, etc etc.
Process of elimination.

 

[RUQWKNF]

It sounds like one of your clamps is causing the linkage to stick, partially opening the throttle as BlackBandit mentioned. Properly orientated hose clamps are important in this regard. Pop the hood in a well lit area or outside in the sunshine, with car off, move the throttle by hand and see if you can duplicate the stuck throttle condition, if you can, see if you can tell what is causing it too bind up. It's probably the clamp.
Keep us posted.

Patrick

 

[V8killR4U]

What do you mean "its like its stuck again"? Is the throttle plate stuck or not? Did you look under the hood when you got home to see?

If the throttle plate is in fact not closed all the way, look at the spring that closes the throttle plate. Is it broken? Is there anything obstructing the movement of the throttle cable linkage or throttle plate arm?

When i pressed on the accelerator and let off. The motors RPM's did not come down when i let off. Its was like the pedal was still pressed just at that constant rpm, it didnt increase, it just didnt decrease, if that makes sense.

Ill lok under the hood later this weekend as i wasnt able to really see anything under the hood the when the problem occured and didnt pop the hood when i got home last night, it was kinda late.

 

[Jerryl]

When i pressed on the accelerator and let off. The motors RPM's did not come down when i let off. Its was like the pedal was still pressed just at that constant rpm, it didnt increase, it just didnt decrease, if that makes sense.

Ill lok under the hood later this weekend as i wasnt able to really see anything under the hood the when the problem occured and didnt pop the hood when i got home last night, it was kinda late.

Look at your scantool.
If you TPS (without stepping on the pedal) is at the base setting (around the 0.45V number), I would say your throttle / pedal is mot likely not stuck.
With the base setting "in range", and constant RPM, I could suspect a MASSIVE vacuum leak after the TB ......... worth a try I guess.

 

[mikestertwo]

Check the return spring for binding. I had a problem with a 70mm throttle body on my son's car with the return spring getting compressed between the throttle arm and the throttle body. I had to machine the throttle body to get some clearance.

 

[cruzn57]

check the throttle cable

disconnect it from the TB and work it slowly in and out, feel for snags,
I had same problem, (once at full throttle, once at part throttle)
was a fray in the cable, would catch and scare the poop out of you!:biggrin:
good luck

 

[bison]

I had a problem at one time with my KB TB sticking partially open at part throttle. I had cleaned the TB with some brake parts cleaner and removed all oil and residue. Apparently the seals on the ends of the shafts that keep boost in and prevent vacuum leaks got a little too dry and hung the throttle open only when the engine was running. They must be a small lip seal or else this wouldnt happen. I took off the TB and oiled the shafts with engine oil and havent had a problem since. It took me a day or so to figure this out since it would only stick when there was high vacuum in the engine. Make sure your TB roll pin that pushes on the TPS lever is not too long or it could catch on the tb and keep the throttle open

 

[V8killR4U]

Thans for the responses guys, ill look over it this weekend and let you know what i find.

 

[86 TR]

It sounds like one of your clamps is causing the linkage to stick, partially opening the throttle as BlackBandit mentioned. Properly orientated hose clamps are important in this regard.



I had the same thing happen to me this spring when I put the new I/C and turbo on. I didn't pay attention to the placement of the clamps. I started the car and went to rev it up from under the hood and waaaaaaaa. It stuck on me about 1/2 throttle. Luckily I wasn't driving it. I got it shut down right away. Woulda scared the crap out of me.

Hopefully its something simple like dirt, debris on the throttle blade, frayed throttle cable or a improperly positioned hose clamp.

 

[carlsbadGN]

If you have a fuel pressure gauge mounted at the end of the fuel rail, the linkage may be hanging up on the gauge.

 

[stevemon]

Tagging this thread.

 

[TR Custom Parts]

I'll place my bet on the hose clamp hanging up. Especially since you say it happened after you blew a hose off.

 

[V8killR4U]

Take off the up-pipe and inspect the TB for debrit and it's operation.
If ok, then unhook the cruise cable. Check travel/binding/operation, etc etc.
Process of elimination.

Well that was it! Took off the Up pipe and there was a lil piece of rubber from the Hose stuck in the throttle blade.

Thanks guys!