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Just came back from two auto zone locations. They both had code readers only I was like nope, thanks. I can read those with a paper clip. I have no clue if it has been bent. Can anyone tell from these pics?
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Incorrect, and you of all people should know this. The throttleblade screw is only about changing the relationship with the IAC and the ECM will always call for the programmed idle. While opening the throttleblade may cause a lean condition and higher idle the ECM will still be attempting programmed idle.
That is true for normal conditions. In my case I was trying to increase the idle to about 2000 RPM to "pack" the cooling system. I jammed a large screwdriver into the throttle stop to do this.
Incorrect, and you of all people should know this. The throttleblade screw is only about changing the relationship with the IAC and the ECM will always call for the programmed idle. While opening the throttleblade may cause a lean condition and higher idle the ECM will still be attempting programmed idle.
If you lug the engine while it's idling such as by turning on the A/C or maybe by rotating the steering wheel in park, I would think the counts would increase..
Secondly if you suspect the Data logger isn't registering the data, and you do in fact have proper idle control, try disconnecting the IAC and perform the above test's.. I would think the idle would fall off drastically.
If you lug the engine while it's idling such as by turning on the A/C or maybe by rotating the steering wheel in park, I would think the counts would increase..
Secondly if you suspect the Data logger isn't registering the data, and you do in fact have proper idle control, try disconnecting the IAC and perform the above test's.. I would think the idle would fall off drastically.
If you lug the engine while it's idling such as by turning on the A/C or maybe by rotating the steering wheel in park, I would think the counts would increase..
Secondly if you suspect the Data logger isn't registering the data, and you do in fact have proper idle control, try disconnecting the IAC and perform the above test's.. I would think the idle would fall off drastically.
Just a thought
Honestly, I think I am getting correct info from the scan tool. IAC counts go up to 20 with AC running.
Honestly, I think I am getting correct info from the scan tool. IAC counts go up to 20 with AC running.
thats great. good testing in changes with ac.
the hinge, eerrrrr, the pin that that butterflies rotate on. they go through the tb and sometimes if old enough they can egg shape or versize and air can get in between the shaft and the tb housing.
spray something flammable , be cautions, and see if u notice any rpm increase at all.
do u have any holes top or bottom sides of the Accordian intake tube behind the maf?
the hinge, eerrrrr, the pin that that butterflies rotate on. they go through the tb and sometimes if old enough they can egg shape or versize and air can get in between the shaft and the tb housing.
spray something flammable , be cautions, and see if u notice any rpm increase at all.
do u have any holes top or bottom sides of the Accordian intake tube behind the maf?
Funny you mention that, as I just checked for that. Nothing there. This IAC at zero is preventing me from doing long tubes and 1.6 roller rockers, and tune I'll figure it out one day. OK, will check for that later today. If not today, tomorrow no doubt. Where the air filter goes, it doesn't look like it's flush. Filter is in fine, just where it sits. Hopefully I'm making sense. But I doubt my problem will be that easy to find I did take it to a Vette shop middle of March, they couldn't find the problem either.
Last edited by 1993C4LT1; May 15, 2016 at 02:54 PM.
Honestly, I think I am getting correct info from the scan tool. IAC counts go up to 20 with AC running.
IF that is the case and it is at 0 without the AC, I would run it without the AC and turn the screw out then rev and see what is settles down to. Your target is 20-30, at least that is what I have done on mine.
If you can confirm that your scanner is accurate in terms of IAC counts (I personally wouldn't consider the A/C thing as 100% solid proof) then the next step you should do is check for vacuum leaks. I recommend a smoke test.
There are only so many hoses. Pull one off, block it, Rev and see if it settles back to 0.if it does, put hose back and go to the next. If it increases, that hose or something down the line might be a problem. When done with the hoses, I'd like to spray propane around the gaskets and see RPM change.
That is true for normal conditions. In my case I was trying to increase the idle to about 2000 RPM to "pack" the cooling system. I jammed a large screwdriver into the throttle stop to do this.
Correct, by opening it you created a lean condition the ECM and IAC could not make up for!
I was like nope, thanks. I can read those with a paper clip. I have no clue if it has been bent. Can anyone tell from these pics?
I'll figure it out one day. OK, will check for that later today. If not today, tomorrow no doubt. Where the air filter goes, it doesn't look like it's flush. Filter is in fine, just where it sits. Hopefully I'm making sense. But I doubt my problem will be that easy to find
