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1987 350 Tbi High Idle


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#1 haulincats

haulincats

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Posted 11 August 2010 - 11:35 AM

I have an 87 350 TBI and it idles about 2,000 rpm's
I don't see any way to adjust it.
How do I get it to idle down?
Thanks,
van

#2 2001Silverado364

2001Silverado364

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Posted 11 August 2010 - 11:37 AM

I have an 87 350 TBI and it idles about 2,000 rpm's
I don't see any way to adjust it.
How do I get it to idle down?
Thanks,
van


Sounds like your IAC valve is bad.

#3 Cliff883

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Posted 11 August 2010 - 11:57 AM

Check for a vacuum leak. Mine was like that when I bought it and it was the throttle body gasket, or should I say the lack of one.

#4 haulincats

haulincats

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Posted 11 August 2010 - 10:08 PM

I have an 87 350 TBI and it idles about 2,000 rpm's
I don't see any way to adjust it.
How do I get it to idle down?
Thanks,
van


Sounds like your IAC valve is bad.

What is that, where is it and how do I check it?
Thanks,
van



#5 haulincats

haulincats

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Posted 11 August 2010 - 10:10 PM

Check for a vacuum leak. Mine was like that when I bought it and it was the throttle body gasket, or should I say the lack of one.

Do you mean the gasket between the throttle body and the intake manifold?
Thanks,
van

#6 2001Silverado364

2001Silverado364

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  • Name:Tyler
  • Location:Augusta, GA
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  • Drives:The LQ4

Posted 11 August 2010 - 10:15 PM

I have an 87 350 TBI and it idles about 2,000 rpm's
I don't see any way to adjust it.
How do I get it to idle down?
Thanks,
van


Sounds like your IAC valve is bad.

What is that, where is it and how do I check it?
Thanks,
van


It's a valve that sets how much air enters your engine at idle with a solenoid that goes in and out with a rubber tip on the end. If you unplug it and notice no difference, then it's that. It's located on the side of TB and has 4 wire connector hooked to it. The body of the valve is shaped like a big nut for a wrench to turn. If it does make a difference, then it's good. To check, turn the key to the run position then unplug IAC, then start truck and look for differences in idle speed. Plugging it up while running will result in nothing different even if the IAC is good.

#7 Cliff883

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Posted 12 August 2010 - 08:15 AM

Check for a vacuum leak. Mine was like that when I bought it and it was the throttle body gasket, or should I say the lack of one.

Do you mean the gasket between the throttle body and the intake manifold?
Thanks,
van



Yes, Thats the one. You may just want to buy the TBI rebuild kit. its very inexpensive.




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