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140 Posts
ok so my mechanic pointed out to me today that my idle is way too high is there a way i can adjust it? it is a 1989 chevy suburban 350 5.7 tbi
idle way high
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1,786 Posts
Idle in the TBI is controlled by the computer, and other things. Not real familiar with these newer fuel injection systems so I will leave it for more informed members.
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140 Posts
ok well my mechanic said its most likely the throttle body gasket and if he's not right eh 2.99 from autozone...
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2,934 Posts
It should idle around 700-900. What's it at?
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140 Posts
idk exactly but its really high
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4,163 Posts
My 87 TBI 350 idles high because the main housing gets worn out where the main butterfly shaft runs through it so it hangs up and keeps the throttle cracked open a bit causing the high idle. If I quickly pop my foot on the pedal and let it pop up it will idle down to normal. I have been told you can have it worked over for a couple of hundred clams but I may just go with a aftermarket TBI instead.
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19 Posts
Love The Beast
It could also be the idle air control (iac) motor. When its idleing high shut off truck for ten sec. & restart it if the idle is down good chance thats it (about $50)
It could also be the idle air control (iac) motor. When its idleing high shut off truck for ten sec. & restart it if the idle is down good chance thats it (about $50)
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