idle
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
I would check again for vaccum leaks , this sounds like a classic case.If it were just a high idle it could be a few other things... The only other things that I can think of that you may want to check are the IAC, also maybe hook up a fuel pressure gauge to make sure you have steady pressure at around 40-42 pounds... WW
Last edited by WW7; Jan 15, 2014 at 12:28 PM.
Burning Brakes
Joined: Aug 2001
Posts: 1,146
Likes: 9
From: Troy Ohio
Mine was doing same thing......Replaced IAC valve and cleaned throttle body while it was off....Cleared right up!!!!
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Heel & Toe
Joined: Nov 2013
Posts: 20
Likes: 0
From: Bloomington Illinois
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Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
"Idle air control" , it's screwed in under the Throttle body on the passenger side and has a 4 prong plug running to it..It controls your idle by allowing varying amounts of air to go past a pintle run by a small motor, this pintle moves in and out to control the air flow, this keeps the rpms at the correct setting and also adjusts for any changes in the rpms, like when you turn on the air conditioning..The IAC gets it's settings from the ECM ( computer), and the calculations are measured in something called ( steps) ..WW
Last edited by WW7; Jan 15, 2014 at 02:59 PM.
Heel & Toe
Joined: Nov 2013
Posts: 20
Likes: 0
From: Bloomington Illinois
"Idle air control" , it's screwed in under the Throttle body on the passenger side and has a 4 prong plug running to it..It controls your idle by allowing varying amounts of air to go past a pintle run by a small motor, this pintle moves in and out to control the air flow, this keeps the rpms at the correct setting and also adjusts for any changes in the rpms, like when you turn on the air conditioning..The IAC gets it's settings from the ECM ( computer), and the calculations are measured in something called ( steps) ..WW
Pro
Joined: Aug 2000
Posts: 519
Likes: 2
From: South River N.J.
Billy
Last edited by BILLY D; Jan 15, 2014 at 07:44 PM.
Drifting
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
Check co2 sensor mine surged until I relapced it. The computer reads lean and it shoots fuel in thus the surge and then it tries to compensate to get to 600 rpm idle an ongoing process good luck.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
They have Delphi IAC motors at Rockauto.com for $59.97...This is the cheapest I have seen them...Before putting out the money for a new IAC you should check out some of the things mentioned above... One person mentioned "Fuel Injectors", this could possibly be your problem and is one thing I didn't think to suggest.A bad or clogged injector could cause a up and down idle....Use an ohm meter to check the resistence on each injector ( both hot and cold) and if the reading is below 12 ohms then your injectors need to be replaced.. The normal reading for injectors is 14- 16.5 ohms.. WW
http://www.rockauto.com/catalog/more...298&cc=1041242
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http://www.rockauto.com/catalog/more...298&cc=1041242
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Last edited by WW7; Jan 16, 2014 at 07:10 PM.