Question about 1991 Geo Tracker

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I have a 97 tracker that lopes at idle bad any ideas what it is

Even after the truck warms up it still lopes any ideas what it could be?

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Could be a vacume leak. Need a vacume gauge. Hook up to a vacume port should be around 17-20 inch pounds of mercury (steady). If not this check your emissions system

Posted on May 01, 2009

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Car lopes as soon as it warms up


idle air control is looking for base idle. throttle body base idle plate is dirty with carbon. cleaned out throttle plate with carb cleaner and tooth brush. use rags to catch black carbon.open plate.by some one hold throttle plate open with gas pedal. engine not running. after completed, start engine. run 1500 prm for a short time to clean out excess fluid. that should fix your problem..

Jan 18, 2013 | 1991 Chevrolet Corvette

1 Answer

I have a 1990 Tracker. When cold it idles very high, 2300 RPM, then goes to a surging idle as it warms up< 1400 to 2000RPM, then after it is warm it idles nicely. How do I reduce the idle when cold...


sounds like the idle air control sensor is bad or it could be the idle speed control sensor(module) both can be found on the throttlebody. but to be sure you can take the car to auto-zone and they will run a free diagnostic even if you dont have a check engine light there still may be a code stored.

Aug 22, 2010 | 1998 Chevrolet Tracker

1 Answer

Engine lopes at stedy rpms almost cutting out, 97 t bird 3.8


im having the same problem w my 97 bird... lopey or rough idle. no luck yet changed or tested many sensors already... if you have any tips let me know and ill do the same, michaelcdx@yahoo.com Thanks

Jun 16, 2010 | 1997 Ford Thunderbird LX

1 Answer

My 01 grand am lopes like its cammed out or something when idling i had the timing chain replaiced compression checked and tps replaced im out of ideas


So did you do all this to fix the loping or the loping came after the repairs? you have a 4cyl or v6??? Find someone with a scanner to check the PIDS.(scanner data)

Mar 11, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Loping idle with a '98 Subauru 2.5


This usually happens when the fuel pump is loosing pressure.

I will just advice you make a replacement on the fuel pump. It is located in the fuel tank beneath the back seat.

Be sure to consider the rating on the fuel pump when replacing.

Good luck and rate my solution.

Dec 03, 2009 | 1998 Subaru Legacy

3 Answers

94 isuzu pickup loping idle problem


I have a 91 pickup with the 2.3 engine. The problem that you are having is likely the same problem I have - and it is caused by the Mixture Control Valve. It is a white plastic barbell shaped device in a holder on the inside fender wall. There are two vacuum hoses going to it - one small diameter and a larger one. Air enters the bottom of the valve and is drawn through the larger hose. The amount of vacuum on the small hose regulates the amount allowed through the large hose. I haven't found one at a parts store nor have I found one in a junk yard just yet. The Isuzu dealer can order one, but as the parts guy said, "Isuzu is very proud of their part". It costs about $150. If you want to check yours, there are several things you can do: first, run the vehicle and put your hand under the valve - it will **** a lot of air all the time. You can pull the valve off the truck and pry the bottom off the housing. You will probably see the same thing I did - broken pieces that used to stop the air flow through the valve. Until you get a replacement, you can try what I did: 1. Pull the small vacuum hose off and let it lay loose, or 2. Pull the small vacuum hose off and let it lay loose AND block the large hose (or the bottom of the valve). In either case, you have to adjust the fast idle screw and/or mixture screw on the side of the carburator. If you adjust either screw, write down what you did, in case you get a new valve later. The diference between 1 and 2 is that 1 will run good once it is warmed up but will want to stall until it warms; 2 runs good both when cold and warm, but will idle faster than it should. Neither of these will make the truck run like it should, but it is a 100 times better than trying to drive it with the loping.

Nov 15, 2009 | 1994 Isuzu Pickup

1 Answer

Car idles high after its warmed up but when its not warmed up it idles really low and kinda lopes 1995 mitsubishi eclipse GST


you have to check on the fast idle control valve or pcv if it needs cleaning or replacement. Also check on vacuum leaks.

Jun 25, 2009 | 1995 Mitsubishi Eclipse

2 Answers

89 Toyota pickup erratic idle when warmed up


its a vacumm guys check all your hoses with a carb cleaner while engine on be carefull not to let it catch on fire with the spray ok give it a slight of puff of it with the spray ok!! remember truck hoses are old and cracking ..

Dec 29, 2008 | 1989 Toyota Pickup SR5

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