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Author Topic: Gas pedal stiff on TBI  (Read 11147 times)

Offline chevytruknut

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Gas pedal stiff on TBI
« on: June 21, 2011, 12:04:44 pm »
Hey guys, I have an 87 silverado with a 350 tbi eng. and 700R trans.  My gas pedal is hard to push. I've tried two different tbi units and the last one I rebuilt. I have a brand new throttle cable and the trans cable is adjusted correctly. Am I missing something? I've had other TBI trucks and the gas pedal was normal. I am doiing jackrabbit starts every time I take off. Anyone else have this problem?
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Offline VileZambonie

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Re: Gas pedal stiff on TBI
« Reply #1 on: June 21, 2011, 10:09:23 pm »
Nope. Is the cable binding?
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Offline chevytruknut

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Re: Gas pedal stiff on TBI
« Reply #2 on: June 22, 2011, 10:17:21 am »
Nope, new cable
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Offline 1979C20

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Re: Gas pedal stiff on TBI
« Reply #3 on: June 22, 2011, 10:45:32 am »
It could still be binding. Did you lube the sleve around the cable that comes out of the firewall?
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Grim 82

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Re: Gas pedal stiff on TBI
« Reply #4 on: June 22, 2011, 10:49:22 am »
Disconnect the cables and turn it by hand. Hook up one cable at a time and see which one is giving resistance.
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Offline topp

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Re: Gas pedal stiff on TBI
« Reply #5 on: June 22, 2011, 12:17:03 pm »
Check the pedal in the truck....

Unhook cable and see if the pedal is binding...
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'90 Suburban TBI 350

Offline Captkaos

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Re: Gas pedal stiff on TBI
« Reply #6 on: June 22, 2011, 01:27:18 pm »
Do you have a return spring hooked to it?
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Offline chevytruknut

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Re: Gas pedal stiff on TBI
« Reply #7 on: June 25, 2011, 06:33:27 pm »
Thanks for the help. Soon as I figure this out I'll post the fix.
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Offline 1979C20

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Re: Gas pedal stiff on TBI
« Reply #8 on: June 25, 2011, 06:42:37 pm »
How stiff is your throttle return spring? That could be a culprit as well.
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Captkaos

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Re: Gas pedal stiff on TBI
« Reply #9 on: June 27, 2011, 03:26:00 pm »
If you have a spring on a TBI THAT is the problem.  The return spring is built into the Throttle body.
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Offline 1979C20

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Re: Gas pedal stiff on TBI
« Reply #10 on: June 27, 2011, 04:31:17 pm »
Quote from: Captkaos on June 27, 2011, 03:26:00 pm
If you have a spring on a TBI THAT is the problem.  The return spring is built into the Throttle body.
i didnt know that capt. Pretty interesting. I figured that when you asked if it had one that it was supposed to.
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline VileZambonie

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Re: Gas pedal stiff on TBI
« Reply #11 on: June 27, 2011, 10:00:19 pm »
post a pic of what you have
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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