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#1 |
Registered User
![]() Join Date: Dec 2010
Location: Grantsville, Ut
Posts: 164
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Another TBI question, High Idle
I have a 88 Suburban, my first TBI motor. It idles high right now. It does not have a tach but I would guess about 1,300 rpm. Where should a TBI motor idle? How do I idle it down? Is there an adjuster screw or does the TBI idle run off a sensor?
This may sound basic for some of you but I am unfamiliar with the TBI. I will say that I have been very impressed. It is very responsive and runs smooth. Last edited by ryanmcb; 04-06-2011 at 02:13 PM. |
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#2 |
Registered User
Join Date: Aug 2010
Location: Las Vegas,NV
Posts: 118
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Re: Another TBI question, High Idle
there is a idle screw but check coolant temp sensor first man i had that same issue...you can look through my previous post and check out all the answers and pictures of the stuff... but i say check that first then go from there...
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#3 |
Registered User
![]() Join Date: Dec 2010
Location: Grantsville, Ut
Posts: 164
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Re: Another TBI question, High Idle
thanks TruAggression. That may be the cause. I did not know those two things are related. I am just going to replace that sensor and eliminate that possiblity.
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#4 |
Registered User
Join Date: Apr 2006
Location: Huntington Beach, CA
Posts: 492
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Re: Another TBI question, High Idle
Threre's a TBI conversion thread that has a ton of awesome info in it. Was a huge help to me getting my truck running right. Vac leak is a big source of high idle issues as well. I replaced the base gaskets on mine and it made a world of difference.
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'87 R30 Crew Cab Dually It's 11 PM, do you know where your IAC pintle is? |
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#5 |
Registered User
Join Date: Aug 2010
Location: Las Vegas,NV
Posts: 118
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Re: Another TBI question, High Idle
Yeah base gasket is another possible that I changed as well even the iac as well... Tbi is a fun motor to play with and yes I love how smooth it runs when it does run good...
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#6 |
18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: Another TBI question, High Idle
yup base gasket first thing Id check
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2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home... ![]() |
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#7 |
Registered User
![]() Join Date: Dec 2010
Location: Grantsville, Ut
Posts: 164
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Re: Another TBI question, High Idle
Ok, I will do the base gasket as well. I actually found the thread you guys are talking about. That has some awesome information, thank you. I have enough to keep me busy for an entire weekend. I will let you all know what happens.
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#8 |
Registered User
Join Date: Jul 2010
Location: Georgetown, KY
Posts: 183
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Re: Another TBI question, High Idle
Check your O2 sensor, if it is faulty then the truck will run in a limp mode with a preset idle (like when you first start the truck in the morning).
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Andrew 1987 V20 Scottsdale 383 TBI, SM465, NP208, 14FF, 4.10 1988 C1500 Scottsdale 305, 700R4, 3.08 1986 K30 Custom Deluxe 6.2, SM465, NP205, 14FF, 4.10 |
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#9 |
'82 GMC Sierra Classic
Join Date: Aug 2005
Location: Oklahoma City
Posts: 82
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Re: Another TBI question, High Idle
You can use some WD40 and spray the base of your throttle body to check for the gasket leaking, if the idle drops when you spray the base, then replace the gasket... just a quick way to check it before pulling it...
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#10 |
Registered User
Join Date: Feb 2009
Location: washington the state
Posts: 730
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Re: Another TBI question, High Idle
the coolent temp will kinda act like a choke it will add fuel when its cold
and its the one right below the thermostat the one that in the side of the head is only for the gauge the way I understand it
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my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG |
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