Jump to content

Sticky throttle

kc5deb

Recommended Posts

kc5deb Enthusiast

kc5deb

Posted
Posted

I know on my last truck (98 Ford F150), my throttle was sticking. It'd take a bit to move the accelerator, and once it "un-stuck", it was fine. I figured out the problem was that Ford directs the burned exhaust through a hose back into the throttle body. All that did for it was put a bunch of sticky carbon buildup in there, and cause the butterfly to stick after it had sit for a few hours. After taking off the throttle body and cleaning it good with Berrymans, it never stuck again, and seemed to pick up some pep. Good design there, ford :P

 

I'm wondering if the same thing is true with the GM motors. Do they pass some of the exhaust gas back through the throttle body too?

 

If not, what are some of the possibilities of what's causing it to stick then release suddenly from a standstill after it's set?

 

I know it's not a drive by wire from the cab to the engine; I can trace the physical throttle cable up to the cowling covering the intake; just haven't taken off that covering yet.

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted

Almost all throttle bodys build up gunk over time. Yeah get a can of throttle body cleaner and a toothbrush and it's done.

 

Vernon

HDGMC Enthusiast

HDGMC

Posted
Posted

On my last GMC which was a 2000 2500 Ext Cab 4x4 with the 6.0 I developed the same problem. Took it to the local dealer who showed me the service bulletin on it. There was a hole in the plate inside my throttlebody that needed to be plugged with a rubber plunger. The throttlebody had to be removed first and cleaned with throttle body cleaner spray. After I bought the plug(Pocket change), cleaned the throttle body, and inserted the plug, I took it back to the dealership and the mechanic recalibrated something and problem was fixed. Not sure what year trucks would be affected. I would say go to a dealership that you trust and ask to see the service bulletin. Mine was done at no charge but pulling and cleaning the throttlebody was kind of a pain. Good Luck! :P

kc5deb Enthusiast

kc5deb

Posted
  • Author
Posted

Just cleaned the throttle body and butterfly; man, was it nasty. Sad that they feel the need to run dirty exhaust through a system that they spend so much time trying to keep clean...

 

But, no more sticky throttle.

 

I was going to get the plug, but, the dealer here told me the plug was free, but, it was going to cost to have it hooked up to the computer to have it re-adjusted.

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
Posted
Just cleaned the throttle body and butterfly; man, was it nasty.  Sad that they feel the need to run dirty exhaust through a system that they spend so much time trying to keep clean...

 

But, no more sticky throttle.

 

I was going to get the plug, but, the dealer here told me the plug was free, but, it was going to cost to have it hooked up to the computer to have it re-adjusted.

 

 

 

 

Change your PCV valve if you dont have the orificed type valve. Trust me, it helps. PCV system on these engines suck.

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted

What the plug does is block of the idle air passage so that the throttle plate can be cranked open a few more degress without jacking up the idle speed. Doing that give the throttle plate just a little more clearance from the bore so that it's less likely to stick again. They wanted to charge you to adjust the throttle stop screw for base idle speed (without the computer making constant adjustments).

 

Vernon

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,840
    Total Members
    8,960
    Most Online
    appletrav
    Newest Member
    appletrav
    Joined

  • Who's Online   4 Members, 0 Anonymous, 330 Guests (See full list)

  • Latest Articles

  • Posts

    • PhilB
      No 12v outlets in 2026 gmc Sierra

      By PhilB · Posted

      It is possible to add your own 12v outlet to your truck.  Check out this video:   I verified via GM Upfitters that pin 31 is the same on the 1500 trucks.  The wire is GM part number 84779405.   You can get the GM 12v outlet from Amazon  https://www.amazon.com/Genuine-Accessory-Receptacle-25774623-13549530/dp/B0F1H9YRGF EWAY 12 Volt Power Adapter for GM   https://www.amazon.com/EWAY-Chevrolet-Silverado-Cigarette-Ignition/dp/B0915RRW6Q/ref=sr_1_1?   I just haven't figured out a good place to put the 12v outlet in my truck.   Some people are getting USB-C to 12V adapters  https://www.amazon.com/WYMECT-Cigarette-Lighter-Socket-Adapter/dp/B0F87WNQKB/ref=sr_1_1_sspa? Not sure if they provide the correct amperage that a device like a tire inflator would need.  
    • Core-Lokt
      Wiring Help, Please

      By Core-Lokt · Posted

      Thanks; I looked there a few minutes, and I think I can find something. I really never looked there, as I thought it was stuff like PTO/aftermarket bodies/accessories like snow plows.
    • newdude
      2 speed transfer case optional now?

      By newdude · Posted

      This is a 1/2 ton thing ONLY.  All HDs 2020-2026 have the two speed transfer case, with Autotrac as an option.     1/2 tons 2019-2026, regular 4x4s come with a single speed case (no 4LO!), and trucks with Z71 ordered, or all Trail Boss trucks come with the 2 speed case.  2 speed case is also an option on WT, and is also standard on High Country.  
    • newdude
      Different requirements for oil filters?

      By newdude · Posted

      2013 5.3 still to this day calls for the PF48 filter.  Which as a 15psi bypass pressure.     There is a TSB, 17-NA-157 that talks about the PF-63 and PF-64 filters which have a higher bypass rating of 22psi.    TSB HERE - temp.xml   "Beginning in 2012, the oil pumps began to regulate main gallery feedback instead of pump out pressure. This means that the oil pump now does not begin to regulate until pressure is built up to the main gallery. This change reduces the amount of time it takes to provide oil to the engine bearing and lifters during extreme cold start conditions.  Main gallery feedback oil pump control systems are present on the following engine families which use Spin-on oil filters: Small Gas Engine (SGE), Large Gas Engine (LGE), High Feature (HFV6) Gen2 and Small Block Gen5 gasoline engines. These engines with the main gallery feedback oil pump control systems are factory built with an ACDelco® oil filters"   It also calls out what engines use those filters.  The gen 4 small blocks were not on that list (LMG, LC9, L9H, L92, L94, L20, L96).  Gen 5 small blocks use the higher pressure filter.          That all said...   Your 7045 Napa filter is the PF63 equivalent, with 22psi bypass.  You are already using the higher bypass pressure filter.  You CAN keep using it, you don't technically have to use it though.  
    • Grumpy Bear
      Different requirements for oil filters?

      By Grumpy Bear · Posted

      Do you know WHY the filter relief setting was increased to 22 psig?    When the new system goes into the second stage the pump volume ramps up considerably. It was found that the 15 psi filter bypass setting put the filter in bypass on a warm engine when the second stage was activated. Raising the filter bypass setting forced the filter to do what it designed to do. Filter. Preventing debris from circulating during high load, high rpm operation.    So next question is how did GM find this out? VLOM/lifter failures and a deep dive by Melling Corp.    Last question. Is it required? Look at it like this; a motor may be equipped with a rev limiter. But it only works if the set point in reached. That 22 psig setting only matters if the pressure differential across the filter media exceeds 15 psig during normal warm operation. Second stage kicks in around 3000-3500 rpm.    I can't answer your question because I don't know you and how you use the truck. But I think there is enough information here to let you decide for yourself. 😉

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...