idling high
idling high so i have a 1997 camaro z28, it's a pretty much stock lt1 but it's idling way too high.
1500rpms at idle when warm and cold.
I've replaced the tps sensor thinking that was my problem because it was throwing a code, but it made no difference once installed.
i can't find a single vacuum leak on it, and I've searched everywhere i know to search. i've also replaced the tb gasket,maf sensor, and cleaned the IAC valve with carb cleaner.
the only things modification wise that are done to it are:
tb coolant bypass.
cut-out.
descreened maf sensor.
i need help, i don't know what else it could be.
any ideas?
1500rpms at idle when warm and cold.
I've replaced the tps sensor thinking that was my problem because it was throwing a code, but it made no difference once installed.
i can't find a single vacuum leak on it, and I've searched everywhere i know to search. i've also replaced the tb gasket,maf sensor, and cleaned the IAC valve with carb cleaner.
the only things modification wise that are done to it are:
tb coolant bypass.
cut-out.
descreened maf sensor.
i need help, i don't know what else it could be.
any ideas?
the only thing weird i find about that is that in most cases that i've heard of an IAC valve being bad the car wouldn't even idle.
my car idles fine, just way too high.
i just don't want to go blow money on parts that arn't going to do anything for me.
how much did you end up getting one from a junk yard for?
my car idles fine, just way too high.
i just don't want to go blow money on parts that arn't going to do anything for me.
how much did you end up getting one from a junk yard for?
Did the car start idling high when the code was thrown? What was the code? When you put the new one on did you make sure it is reading the correct voltage? Have you ever adjusted the throttle blade stop screw?
Last edited by SS RRR; Apr 11, 2009 at 03:13 AM.
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You can do two things:
Check the voltage on the TPS. You can do this by tapping the blue wire on the TPS harness which plugs into the TPS. Turn the key to the "on" position and read the voltage. With the blades closed it should read around .7 volts. With the blades fully open it should read 4.5 volts. If this is off for any reason it can cause the engine to idle higher than normal.
You can also try to reset your IAC:
http://shbox.com/1/4th_gen_tech2.html#iac_reset
Whenever you get your car scanned you need to find out what code it is. It can be real helpful in the diagnosing process.
Check the voltage on the TPS. You can do this by tapping the blue wire on the TPS harness which plugs into the TPS. Turn the key to the "on" position and read the voltage. With the blades closed it should read around .7 volts. With the blades fully open it should read 4.5 volts. If this is off for any reason it can cause the engine to idle higher than normal.
You can also try to reset your IAC:
http://shbox.com/1/4th_gen_tech2.html#iac_reset
Whenever you get your car scanned you need to find out what code it is. It can be real helpful in the diagnosing process.
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Staging Lane
Joined: May 2008
Posts: 50
Likes: 0
From: Omaha,Ne
I say you need to figure out what trouble code you have for sure and then go from there. No need to look in the wrong direction if the code tells you where to look. Fix the obvious problem the move on if that doesn't fix the problem
what do you mean by turning the key on and reading the voltage?
next time i take it to get codes read on it, i'll write them down..
i'm thinking it's my IAC valve because whenever i took it off to clean it, it wouldn't budge when i tried to push on it or pull on it.
next time i take it to get codes read on it, i'll write them down..
i'm thinking it's my IAC valve because whenever i took it off to clean it, it wouldn't budge when i tried to push on it or pull on it.
Read what I said again. You need a volt meter. You need to tap into the blue wire on the TPS harness with red lead from volt meter. You need to ground black lead on volt meter. Turn meter on. Make sure volt meter is on a DC reading. Turn ignition key to ON position. Read voltage. Voltage with throttle blades closed should read approx .7 volts. Throttle blades at wide open position should read around 4.5 volts.
