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For the TBI guys!

y5mgisi

y5mgisi

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I didn't see it mentioned but did you set minimum air (base idle)? It sounds like the stall saver cutting in. If the idle is set too low, this will cut in to save a stall but is switched off as soon as you touch the throttle. You can't just screw the adjuster in, you have to go through a sequence with the IAC being unplugged.
 
I havnt heard of that. But let me say that i have adjustd both TPS and idle scwer as well with no improvmnet
 
y5mgisi said:
I havnt heard of that. But let me say that i have adjustd both TPS and idle scwer as well with no improvmnet
Click to expand...
You have to follow this procedure when setting base idle:
(courtesy of Ryoken)

heres how you can adjust idle tho if everything looks good..Take a paper clip and jump the ALDL in the 'A' and 'B' pins.

Turn on the ignition, but don't start the engine. Wait 30 seconds. Now, go remove the connector from the IAC.

Start engine. You are now going to adjust "minimum air". There is a Torx screw on the side of the throttle body. This is what needs to be turned to adjust minimum air, or more commonly known as "idle speed". It comes from the factory with a protective metal cap over it. If the cap is still there, use a small punch to knock it out. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. Once the idle rpm is set, turn off the engine.

Re-connect the connector onto the IAC. Start engine. Idle speed is now once again governed by the ECM, but your idle should be smooth and steady, approximately 600 rpm in Drive (for unmodified cars).

If you set an SES light by having the IAC disconnected, then after shutting down the engine disconnect the negative battery terminal. Wait 5 minutes. This will clear the ECM of all trouble codes. Re-connect the battery and drive the car for 20 minutes to allow the ECM to relearn your driving style.
__________________
 
southernspeed said:
You have to follow this procedure when setting base idle:
(courtesy of Ryoken)

heres how you can adjust idle tho if everything looks good..Take a paper clip and jump the ALDL in the 'A' and 'B' pins.

Turn on the ignition, but don't start the engine. Wait 30 seconds. Now, go remove the connector from the IAC.

Start engine. You are now going to adjust "minimum air". There is a Torx screw on the side of the throttle body. This is what needs to be turned to adjust minimum air, or more commonly known as "idle speed". It comes from the factory with a protective metal cap over it. If the cap is still there, use a small punch to knock it out. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. Once the idle rpm is set, turn off the engine.

Re-connect the connector onto the IAC. Start engine. Idle speed is now once again governed by the ECM, but your idle should be smooth and steady, approximately 600 rpm in Drive (for unmodified cars).

If you set an SES light by having the IAC disconnected, then after shutting down the engine disconnect the negative battery terminal. Wait 5 minutes. This will clear the ECM of all trouble codes. Re-connect the battery and drive the car for 20 minutes to allow the ECM to relearn your driving style.
__________________
Click to expand...

Right click, copy. :wink1: Thanks, I'm sure that will come in handy some day.
 
Any up dates on the idle surge problem?
I have an '89 Sub w/ a 383 and TBI that just recently (well, about 8 months) would die when put into drive. It would idle in park. Sometimes after driving it for a while and turning it off, it wouldn't start back up. I solved the problem by just not driving the truck for a few months but I need to get it up and running because it was my most reliable means of transportation.
Good luck.
 
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