idle air control??

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  #1  
Old 02-01-05, 04:10 PM
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idle air control??

93 lumina eurosport 3.1... runs like crap, missing when at idle...tapping on the idle air control makes rpms go up and then back to missing...is there a way to check this component or is it probably it? any other hints maybe?

thanx, Sal
 
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  #2  
Old 02-01-05, 04:11 PM
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Originally Posted by saldog6
93 lumina eurosport 3.1... runs like crap, missing when at idle...tapping on the idle air control makes rpms go up and then back to missing...is there a way to check this component or is it probably it? any other hints maybe?

thanx, Sal
runs great when at higher speed...
 
  #3  
Old 02-01-05, 04:28 PM
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Pull the wires off the coils and the plugs and look for black soot or white corrosion or rust.If you have any of these let us know.IAC valves don't go bad very often on GM cars.
 
  #4  
Old 02-01-05, 04:32 PM
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but....

just switched the IAC with one on my 89 calalier 2.8 and it idled fine but with a little higher rpm....changed plug just last month and wires were fine with great ohm readings..no corrosion....what do ya think?
 
  #5  
Old 02-01-05, 04:41 PM
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Turn the car off unplug the IAC connector,start the car if it idles good replace the IAC.Is it a misfire or rough idle?
 
  #6  
Old 02-01-05, 04:54 PM
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ok did it

i went out just now and unplugged it car ran like garbage...now i did put the old one back in...turned car off and plugged it back in and started fine but very low idle and slight miss...with car running i unplugged it and still ran the same...restarted and ran like junk.....
 
  #7  
Old 02-01-05, 10:30 PM
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My experience with GM idle controls (and it has been quite a while since my last personal contact) is that they need to "learn" the position of the pintle. This usually requires driving the car for soe distance.

HTH.
 
  #8  
Old 02-02-05, 05:05 PM
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took care of it.........

well at cold start with the old one in the old dog wouldnt start...put the one in from the 2.8 cav and it started right up....broke down and got pissed and went to autozun,which i call it, its greek..., and bought a new one...put it in and fired right up....drove around and let it learn with no problems.....running great again....the tapping on it and the varience of rpm kind of told me to replace it....thanx for all the advice...my the both of u goto sleep knowing u have helped a doityourselfer...... thanx again, Sal
 
  #9  
Old 02-02-05, 05:08 PM
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Exclamation

Originally Posted by saldog6
well at cold start with the old one in the old dog wouldnt start...put the one in from the 2.8 cav and it started right up....broke down and got pissed and went to autozun,which i call it, its greek..., and bought a new one...put it in and fired right up....drove around and let it learn with no problems.....running great again....the tapping on it and the varience of rpm kind of told me to replace it....thanx for all the advice...my the both of u goto sleep knowing u have helped a doityourselfer...... thanx again, Sal
throttle body sensor was my next target..but no need....
 
  #10  
Old 02-03-05, 11:56 AM
Jkei3207
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THis is a really stupid question, but what is the difference between loping, misfireing, or rough idling?
 
  #11  
Old 02-03-05, 06:38 PM
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Exclamation i would have to say...

that rough idling is that at idle or a stop light the engine surges or sputs, almost like a misfire,but runs smooth when at higher rpm...

a misfire, i would say, is when in park sounds like a dragster and lets say u are in your driveway in drive, place your foot on the brake and the other on gas and rev to 2000 rpm without moving the car and it still doesnt run smooth...

a loping is when u run off to vegas and marry some hottie that doesnt have a rough idle and revs at high rpm....misfire will happen later....
 
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