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Discussion Starter · #1 ·
Sometimes my 89 isuzu trooper's 2.6 4 cyl "lopes" when it idles or idles high , like at 1500-2000
by lopes i means is goes up to 2000 then back down to a grand
it also has a had time starting

some guy told me it could be some idle air control thingy

PLEASE any help would be gratly appreciated
 

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Hi John,
Are you looking at your temp guage when it does this? If its running warm at idle, it will do this in an attempt to cool itself. Also, check for a loose vaccum line, and check the timing.

HTH,
Adam
 

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Mine (89 2.6l) does the same thing, but only with the O2 sensor plugged in. The temp is perfect when it happens, nice and cool. If I unplug the sensor the loping will stop and not happen at all. I dont like a motor that is acting possesed! Try unpluggin your o2 sensor and see what happens. I am going to get a new o2 sensor and see what happens with a new one plugged in, Its my ECM is running DOS or FORTRAN or somethng :lol: . Let me know what you get if its till an issue....
PEACE
 

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Hey, im new to the forum, but i know exactly what ur talking about. I am having the same issues, i have had 2 different ppl look at it both times for 3 weeks. They always say its some sensor, from tps to 02, or one said it was an intake leak. They have still not fixed it, when i start out, i turn on the max ac, and tap the gas til it warms up, then it idles right...when it wants, then sometimes as i am pulling up to a light, it will start the lopeing thing, to stop it i hit the gas to 2k, and let off, it quits most of the time. I dont know what to do,b/c i am not flashing any codes and no light s are on or nething. I love my troop, and i want to get that fixed.
 
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