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Thread: idle way high
07-14-2007, 10:10 PM #1
idle way high
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
07-15-2007, 07:13 AM #2
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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07-16-2007, 05:48 PM #3
ok well my mechanic said its most likely the throttle body gasket and if he's not right eh 2.99 from autozone...
07-16-2007, 07:40 PM #4
It should idle around 700-900. What's it at?Patrick
07-16-2007, 09:50 PM #5
idk exactly but its really high
07-16-2007, 11:04 PM #6
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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.Darcy
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07-16-2007, 11:22 PM #7
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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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