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Gas Pedal Has Catch, Must Push Hard

 
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Fallguy
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PostPosted: Wed Jan 13, 2010 2:43 pm    Post subject:  Gas Pedal Has Catch, Must Push Hard Reply with quote

05 Impala. What would be the most likely culprit. Throttle body gunked a bit?

At very low speed idle or from start you have to push on the gas pedal with a more force than typical to get the pedal to move.

Does this only at lower speeds or from stopped position, seams more prevelant when vehicle has been at rest for a while. I have cleaned and greased the pivot end of the gas pedal in the cab where the pedal is attached to the linkage arm but has not helped.

If I clean the throttle body I dont want to get to carried away. would just wiping around the plate of the butterfly edges and the the barrel be enough. Will I likley see any build up or can it be somewhat transparant. Anything exteranal on the butterfly like the spring that can get gunked (my engine is very clean overall though.

Just looking for ideas as want to takle this in the order of most lkely first.

Regards
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wanderson75
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PostPosted: Wed Jan 13, 2010 2:46 pm    Post subject:   Reply with quote

Pull the TB cable off and pull it through and see if it catches. Check for crush spots on the cable sleeve. I had my Cruise Control cable get pinched and it caused the CC to get stuck accelerating. Which was fun. It's possible for the TB cable to get crushed the same way.

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PostPosted: Wed Jan 13, 2010 3:00 pm    Post subject:   Reply with quote

About three years after I got my car I was experiencing something similar to what you are describing. Mine was due to a huge amount of carbon residue on the inside of the throttle body. The dealer cleaned it out and it was as good as new.

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Last edited by IffyG on Wed Jan 13, 2010 4:09 pm; edited 1 time in total
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Sabrewings
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PostPosted: Wed Jan 13, 2010 3:34 pm    Post subject:   Reply with quote

Dirty throttle plate. Clean as necessary.

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Fallguy
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PostPosted: Wed Jan 13, 2010 4:09 pm    Post subject:  Will try Cleaning Throttle Body Reply with quote

Will try cleaning throttle body when I get ready to tackle, then will play with cable if does not resolve.

Air intake just pries off the throttle body correct (as I see no no band or clamp there).

Thanks.
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PostPosted: Wed Jan 13, 2010 4:12 pm    Post subject:   Reply with quote

I don't want to assume anything, but I also had a problem like this when I routed some wires for my stereo and didn't put the carpet back down the right way. The carpet was folded up under the pedal. If you had been in there recently, it couldn't hurt to take the 2 seconds to check.

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Jayme
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PostPosted: Wed Jan 13, 2010 9:18 pm    Post subject:  Re: Will try Cleaning Throttle Body Reply with quote

Fallguy wrote:
Air intake just pries off the throttle body correct (as I see no no band or clamp there).


Yes. Then remove the C clip that holds the screen in, remove the screen, and clean away. Be careful not to damage the MAF sensor.

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PostPosted: Wed Jan 13, 2010 9:35 pm    Post subject:  sticking gas pedal Reply with quote

Yes , go to the auto parts store and buy throttle body cleaner and clean the plate, I have seen that lucas fuel treatment helps prevent future carbon build up
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PostPosted: Wed Jan 13, 2010 10:19 pm    Post subject:  Re: sticking gas pedal Reply with quote

Leeco388 wrote:
Yes , go to the auto parts store and buy throttle body cleaner and clean the plate, I have seen that lucas fuel treatment helps prevent future carbon build up


It won't prevent it at the throttle body since there is no fuel at the throttle plate.

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PostPosted: Wed Jan 13, 2010 10:23 pm    Post subject:  Re: sticking gas pedal Reply with quote

Sabrewings wrote:
Leeco388 wrote:
Yes , go to the auto parts store and buy throttle body cleaner and clean the plate, I have seen that lucas fuel treatment helps prevent future carbon build up


It won't prevent it at the throttle body since there is no fuel at the throttle plate.


Sabre is correct. These cars use a dry intake. Come too think of it, I don't see how it would help a carb or tbi either.

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PostPosted: Wed Jan 13, 2010 11:32 pm    Post subject:   Reply with quote

It's best to remove the tb completely to clean it. Also clean the iac and iac passage with some qtips.

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PostPosted: Thu Jan 14, 2010 1:43 pm    Post subject:   Reply with quote

What year and engine do you have?

Since the old models had mechanical throttle linkages, an easy check is to turn the throttle with your hand in the direction the cable pulls it.

If the cable is jamming, you must replace it. Lubing it only attracts more dirt in the future.

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PostPosted: Fri Jan 15, 2010 12:50 pm    Post subject:   Reply with quote

05 3.8L

When I twist the wheel a throttle body I feel the catch, just at the start,cable feels ok, believe gunked inside.
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PostPosted: Fri Jan 15, 2010 12:52 pm    Post subject:   Reply with quote

Fallguy wrote:
05 3.8L

When I twist the wheel a throttle body I feel the catch, just at the start,cable feels ok, believe gunked inside.


Most likely. When cleaning, use a sensor/electronics safe throttle body cleaner, or find yourself some security torx bits and remove the sensors entirely.

You'll find that the vast majority of carbon buildup is on the intake side of the throttle body

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