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Correct 82 idle RPM
Thread Starter
Heel & Toe
Joined: Sep 2007
Posts: 24
Likes: 0
From: Fort Thomas KY
Correct 82 idle RPM
What should the RPM idle be once the car is warm? My current idle RPM is at 10 once warm, but seems to be high. I say high because when I put it into reverse to back out of the garage the rear end lifts as if it is ready to go. It goes into gear smoothy, but seems like I have my foot on gas, which I don't.
My only comparison is to my Jeep GC, which is not noticable at all. Granted there are many years difference between a 96 and an 82, but I want to get other 82 owners opinion.
My only comparison is to my Jeep GC, which is not noticable at all. Granted there are many years difference between a 96 and an 82, but I want to get other 82 owners opinion.
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Instructor
Joined: May 2006
Posts: 178
Likes: 0
From: peachtree city
Hopefully it's just a vacuum leak. I had poor idle and bad throttle responce. Ended up bringing my 82 to someone experienced with crossfire engines. It cost about sixty bucks to fix. Good luck.
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Heel & Toe
Joined: Jan 2008
Posts: 23
Likes: 0
From: Lumberton TX
I have the same problem with my 78 L-82. Will not idle below 1000 even when warm. I have adjusted the timing per one of the tech papers on the forum and that helped somewhat, but still idles rough and will kill if I turn the idle screw so it idles below 1000. Think this is vacuum leak? I just bought this car and am still working through all of the issues under the hood. Picture is intake manifold gasket?
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
I have the same problem with my 78 L-82. Will not idle below 1000 even when warm. I have adjusted the timing per one of the tech papers on the forum and that helped somewhat, but still idles rough and will kill if I turn the idle screw so it idles below 1000. Think this is vacuum leak? I just bought this car and am still working through all of the issues under the hood. Picture is intake manifold gasket?
The other cause of high idle on the 82 is the CTS (Coolant temp sensor),O2 or MAP. Leaks also in in the EGR,PCV or headlights system.
Your problem is something else. Not to say its not vaccum related. You can test for leaks. I'm not entirely familiar with your car. But common sources are the lines that go to the headlights. The PCV valve and the EGR. Unplug and cap all those things momentarily see if it makes a difference.
Chock is also a cause on the carb cars...are the plates in the carb closed? Do they look closed all the way. is the choke working? More open the plates are the higher the idle.
Lastly you have the advance to deal with. Not sure how that works on yours. If the advance isn't working right it will cause a high idle.
Time for a new thread. I'm sure someone will be along with answers.
Jim
Pro
Joined: Oct 2006
Posts: 594
Likes: 3
From: Peoria IL
As stated most likely vac leaks - Cross - Fire is very sensitive to leaks . Check all of the bolts around the TB plate and make sure they are torqued to spec , also as stated go over the vac lines looking for any disconnection / leaks.Also check out the Cross fire Vault http://www.crossfire.homeip.net/cftest/default.asp
Lots of very experienced cross fire specific guys over there who will work through your issues with you
Good luck
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
too. I don't have an 82 but my 84 is basically the same engine. It idled all over the place when I got it. Mine had most of the the upper manifold bolts loose, several so much so that I could turn them w/my fingers. Also found a couple minor vacuum leaks too. Then I removed the IAC motors from the TB's and cleaned those and the passages w/carb cleaner as they were pretty dirty. After all that it has idled and run fine for several years now.
As an additional note, I also had another driveability issue occur a few months after I got the car. Turned out the O2 sensor was crudded up and reacting so slowly that is was causing the computer to fall back into the open loop, "pre-canned programming" normally used while the engine is cold and until the O2 sensor is heated and ready to go. The O2 sensor was only $20 and after replacing it the computer stayed closed loop and car responded and smelled much better because it wasn't running sloppy rich all the time.
FWIW Good Luck!
Last edited by ACECO; Feb 20, 2008 at 08:16 PM.
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
I'm sure if I keep the 84 long enough, I'll have to cross this bridge too. TIA.
Heel & Toe
Joined: Jan 2008
Posts: 23
Likes: 0
From: Lumberton TX
That big gasket is only on the 82 and up. Our intakes are two pieces. That gasket is the number one problem on the 82 when it comes to vaccum leaks and higher idle. Thats a must change gasket if you have never done it. No silicon either.
The other cause of high idle on the 82 is the CTS (Coolant temp sensor),O2 or MAP. Leaks also in in the EGR,PCV or headlights system.
Your problem is something else. Not to say its not vaccum related. You can test for leaks. I'm not entirely familiar with your car. But common sources are the lines that go to the headlights. The PCV valve and the EGR. Unplug and cap all those things momentarily see if it makes a difference.
Chock is also a cause on the carb cars...are the plates in the carb closed? Do they look closed all the way. is the choke working? More open the plates are the higher the idle.
Lastly you have the advance to deal with. Not sure how that works on yours. If the advance isn't working right it will cause a high idle.
Time for a new thread. I'm sure someone will be along with answers.
Jim
The other cause of high idle on the 82 is the CTS (Coolant temp sensor),O2 or MAP. Leaks also in in the EGR,PCV or headlights system.
Your problem is something else. Not to say its not vaccum related. You can test for leaks. I'm not entirely familiar with your car. But common sources are the lines that go to the headlights. The PCV valve and the EGR. Unplug and cap all those things momentarily see if it makes a difference.
Chock is also a cause on the carb cars...are the plates in the carb closed? Do they look closed all the way. is the choke working? More open the plates are the higher the idle.
Lastly you have the advance to deal with. Not sure how that works on yours. If the advance isn't working right it will cause a high idle.
Time for a new thread. I'm sure someone will be along with answers.
Jim
