Car Pulls when sitting Ideling at stop light
Thread Starter
Intermediate
Joined: Mar 2012
Posts: 38
Likes: 0
From: Broussard La
Car Pulls when sitting Ideling at stop light
I Have 82 Coup and it has an Automatic Trans and when I Put the car in gear it wants to GO! lol, I found that the Idle was a little high so i idled it down to around 900 RPM when in Neutral and it helped some but you still have to keep your foot on the Pedal pretty hard when setting at a stop light or it will take off with ya. I think from a dead stop if you let off the brake you would be doing around 5 or 7 MPH. Is this normal? and if not where would I adjust this?. Im not a mechanic but in my other vehicles i dont have this problem...If i let off the brake at a stop light they may start creeping up on flat ground but not take off like that. Any Ideas are appreciated
Drifting
Joined: Jul 2008
Posts: 1,873
Likes: 27
From: Sonora CA
too900 is too fast, get it down to 750 in park. if you can't get the idle down due to poor idling, keep tuning. if you can't get the idle down period...... check all moving parts on the carb for proper function, make sure the secondaries are closed/closing all the way...(ask me how I know this) Check for vacuum leaks.
There are a multitude of reasons why an engine idles too fast, just keep looking, you'll get it eventually.
But, in any event, 900 is too high.
Melting Slicks
Joined: Dec 2009
Posts: 3,229
Likes: 656
From: Thunder Bay
My '79 has a 700R4 which should be pretty much the same transmission in your '82. I idle at about 900 in neutral and about 650-700 in gear. I probably have a lot more cam than you, and I have a 3000 stall convertor. Still, I don't think your idle speed alone would explain what you are describing. I wonder if your torque convertor is trying to lock up at idle?
Thread Starter
Intermediate
Joined: Mar 2012
Posts: 38
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From: Broussard La
Yes, Im thinking its something else too. I idled it down and it still does it. When your in Park and go to Drive it jumps real hard and The rearend squats down while you have the brake pedal applied. It also makes a Big Clunk noise (Sounds like that may be a universal joint or Worn bearing in the Diff) After I idled it down it doesnt seem to have as much power now either...Usually when I jump on it from a start it will squeal the tires but now its kinda sluggish Could Idleing it down do that? Im wondering because Im also troubleshooting the Electrical system at the same time for Brake lights and am wondering if i might have unhooked something not knowing it while trying to figure out that problem
Le Mans Master
Joined: Aug 2010
Posts: 9,272
Likes: 17
do you have TBI on that still, if so you need to adjust the TPS and then the IAC.
here's a link
http://api.viglink.com/api/click?for...13333266356091
here's a link
http://api.viglink.com/api/click?for...13333266356091
Last edited by oldalaskaman; Apr 1, 2012 at 08:31 PM.
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Melting Slicks
Joined: Dec 2009
Posts: 3,229
Likes: 656
From: Thunder Bay
I don't know how the torque convertor lockup mechanism works on these cars. My car didn't have a lockup convertor from the factory so I had to build mine from scratch. I would suggest you find out how the lockup is supposed to work, and then check yours to make sure it works properly. I can't think of any other potential reason for the problem you are describing.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,117
From: Crossville TN
If lockup was applied at a idle condition with brakes "ON", the engine would die. I suspect that you or a previous owner (PO) installed a 'shift kit' which allowed hard/fast clutch applies. If so, what you feel now is what you will get.
Burning Brakes
Joined: Aug 2006
Posts: 1,058
Likes: 27
From: Eastern North Carolina
I agree with 7T1vette if the convertor was locked the engine would stall when at a stop.
Melting Slicks
Joined: Dec 2009
Posts: 3,229
Likes: 656
From: Thunder Bay
As I understand it (and I'm by no means an expert) the lockup converter clutch is much like the clutch in a manual transmission, so there is potential for some slippage.
Regardless, I'm sure the problem has to be in the torque convertor, or in the mechanism within the transmission which applies the torque converter clutch.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,117
From: Crossville TN
I misunderstood your compaint. And I agree that with the transmission in gear at idle, it shouldn't be "pulling"....unless the idle speed is such that the torque converter is starting to transfer significant torque to the gear train. And, from your prior posts, 900 rpm is high enough to do that. You also may have some malfunction of the torque converter (stator not working properly with its "friends").
The lockup clutch was mentioned earlier, also. If that clutch was damaged (ie, to the point of slipping) and it really was engaged at idle, I guess it could [theoretically] cause such a problem. To rule that out, disconnect the feed wire that signals the lockup clutch to turn on. Then, if you still have the same problem at idle, the lockup clutch is unlikely to be the cause of that issue.
The lockup clutch was mentioned earlier, also. If that clutch was damaged (ie, to the point of slipping) and it really was engaged at idle, I guess it could [theoretically] cause such a problem. To rule that out, disconnect the feed wire that signals the lockup clutch to turn on. Then, if you still have the same problem at idle, the lockup clutch is unlikely to be the cause of that issue.
Advanced
Joined: Sep 2011
Posts: 57
Likes: 0
From: Midlothian Texas
My 81 has the lockup hooked to a switch.
My kids flipped it ON while it was parked. I could tell that something was wrong immediately. It did not kill the car at idle, and mine is idling at 600RPM.
I believe his converter is staying locked, and with the idle so high it is pulling.
My kids flipped it ON while it was parked. I could tell that something was wrong immediately. It did not kill the car at idle, and mine is idling at 600RPM.
I believe his converter is staying locked, and with the idle so high it is pulling.
Thread Starter
Intermediate
Joined: Mar 2012
Posts: 38
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From: Broussard La
How would I know if it is hooked to a switch? I did find a Toggle switch inside the glove box that I have no idea what it does or what it goes to. I called the PO and of course now i cant get a response from him... is there a certain place they would install such a switch?
thanks guys
thanks guys
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
if you are setting the idle you do not have a throttle body ,you have a carb .on a 82 the idle is set by the computer.it sounds like you have a vac leak .follow the wires from the switch .it may be a alarm or a switch to turn the car off to stop thiefs.show a pic of the motor.
