98 ITR having idle issues...Please help!
03-11-2009, 09:45 AM
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98 ITR having idle issues...Please help!
Hello, I am having idle issues with my 1998 Acura Integra Type R. I’ve been reading every single blog related to idle issues and can’t seem to find out what is wrong with my car.
ISSUE = When driving around with my car fully warm and coming to a complete stop, the idle on my car surges up to 2000 rpm, sticks for about 4 seconds then drops to 1100 – 1300 rpm when I’m in neutral. Basically my idle is HIGH. Typically, base idle should be at 750 rpm however my car is at 1100 rpm. Let me note that my idle screw is screwed all the way in so there must be an issue somewhere.
ITEMS THAT I HAVE ADDRESSED = I went ahead and assumed that it was the IACV (Intake Air Control Valve) due to many blogs claiming it can be a dirty/clogged IACV. I went ahead and gave the IACV a thorough cleaning where this did not solve my problem. I went ahead and purchased a used IACV from a recycling yard thinking that my original IACV was bad. This also did NOT solve the problem. I also replaced the throttle body gasket with a new OEM throttle body gasket. This did not solve my problem as well.
ITEMS I HAVE NOT ADDRESSED = I noticed that I have an aftermarket intake manifold gasket. It is way thicker than the usual OEM gasket. Can it be the aftermarket gasket? I have not bled my coolant yet. Can this be the issue? Should I just purchase a brand NEW IACV? Both IACV’s that I have are pretty dirty however I don’t think 2 IACV’s would be faulty.
As I have been troubleshooting this problem, I noticed when I unplug the IACV when the vehicle is warm my idle is perfect with no STICKING idle at all. When I drive with the IACV unplugged I also get no sticking idle. When I plug the IACV back in it jumps from 750 rpm to roughly 1100 rpm. To my understanding, something is telling my IACV that my car is cold so please suck more air in till warming temperature.
My question is…do you think I have a vacuum leak somewhere? Is there a sensor that is telling my IACV to suck in more air to cause the idle to be higher? Does the thermostat have any relation to the IACV?
Any suggestions would greatly be appreciated! Thanks!
ISSUE = When driving around with my car fully warm and coming to a complete stop, the idle on my car surges up to 2000 rpm, sticks for about 4 seconds then drops to 1100 – 1300 rpm when I’m in neutral. Basically my idle is HIGH. Typically, base idle should be at 750 rpm however my car is at 1100 rpm. Let me note that my idle screw is screwed all the way in so there must be an issue somewhere.
ITEMS THAT I HAVE ADDRESSED = I went ahead and assumed that it was the IACV (Intake Air Control Valve) due to many blogs claiming it can be a dirty/clogged IACV. I went ahead and gave the IACV a thorough cleaning where this did not solve my problem. I went ahead and purchased a used IACV from a recycling yard thinking that my original IACV was bad. This also did NOT solve the problem. I also replaced the throttle body gasket with a new OEM throttle body gasket. This did not solve my problem as well.
ITEMS I HAVE NOT ADDRESSED = I noticed that I have an aftermarket intake manifold gasket. It is way thicker than the usual OEM gasket. Can it be the aftermarket gasket? I have not bled my coolant yet. Can this be the issue? Should I just purchase a brand NEW IACV? Both IACV’s that I have are pretty dirty however I don’t think 2 IACV’s would be faulty.
As I have been troubleshooting this problem, I noticed when I unplug the IACV when the vehicle is warm my idle is perfect with no STICKING idle at all. When I drive with the IACV unplugged I also get no sticking idle. When I plug the IACV back in it jumps from 750 rpm to roughly 1100 rpm. To my understanding, something is telling my IACV that my car is cold so please suck more air in till warming temperature.
My question is…do you think I have a vacuum leak somewhere? Is there a sensor that is telling my IACV to suck in more air to cause the idle to be higher? Does the thermostat have any relation to the IACV?
Any suggestions would greatly be appreciated! Thanks!
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