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idle @ 2000


saldog6's Avatar
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08-14-04, 08:37 PM   #1  
idle @ 2000

moved the cars real quick and now 1993 lumina 3.1 when started revs up to 2000 rpm and wont come down....any hints on this one?

 
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bigguy05641's Avatar
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08-15-04, 04:25 AM   #2  
High TPS voltage with closed throttle blades will result in an elevated idle.

 
Desi501's Avatar
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08-15-04, 08:23 AM   #3  
Posted By: bigguy05641 High TPS voltage with closed throttle blades will result in an elevated idle.
Yeah, among about 20 other possible causes. Before you start throwing parts at it, look for some of the more obvious things like a bad vacuum leak, throttle cable possibly jamming or binding the linkage. There are ways to test the TPS if it comes to that.

 
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08-15-04, 09:08 PM   #4  
tbs was gummed up

took tbs off and was totally black....wiped it down and cleaned the housing, reset the computer and all is well....

 
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08-16-04, 04:54 AM   #5  
Posted By: saldog6 took tbs off and was totally black....wiped it down and cleaned the housing, reset the computer and all is well....
Glad to hear you got it straightened out but, what the heck is a tbs and black with what? I would say that your cure came from resetting the computer and not much else.

 
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08-16-04, 05:30 PM   #6  
throttle body sensor? right at the air intake....was black with carbon or something.....works fine...

 
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08-16-04, 05:55 PM   #7  
Posted By: saldog6 throttle body sensor? right at the air intake....was black with carbon or something.....works fine...
No such sensor.......

There's a TPS(throttle position sensor) but that is totally external and isn't exposed to anything inside to get dirty. Before the throttle body in the intake snorkel you have the IAT (intake air temp) which only see clean intake air or the IAC (idle air control) on the throttle body which isn't a sensor at all but controls your idle through controlling air bleed. Cleaning that is usually the first step in an idle problem. You should also clean all the black gunk from the back of the throttle plate and surrounding housing. That will make it more stable.

 
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