Hunting Idle When A/C is On..?
solaris=amazing
05-05-2005, 03:29 PM
95 4.6/130k miles.
I recently noticed that when i got my ac on, either max ac or ac, my car will literally rev itself. Basically a hunting idle. It will normally idle at a good 800rpms..no ac, with the ac on it will go from like 800..to850..to 800 etc.
Now, i just changed my plugs and cleaned my throttle body's intake plate, could these 2 things have effected anything..? ANOTHER thing, i recently refilled my ac system, with the normal R134...nice ac, good and cold, but the idle thing is weird.
I can live with it, but i just want to make sure thats not a common problem-if say a plug is misfiring or whatever.
I recently noticed that when i got my ac on, either max ac or ac, my car will literally rev itself. Basically a hunting idle. It will normally idle at a good 800rpms..no ac, with the ac on it will go from like 800..to850..to 800 etc.
Now, i just changed my plugs and cleaned my throttle body's intake plate, could these 2 things have effected anything..? ANOTHER thing, i recently refilled my ac system, with the normal R134...nice ac, good and cold, but the idle thing is weird.
I can live with it, but i just want to make sure thats not a common problem-if say a plug is misfiring or whatever.
likhootch
05-12-2005, 11:43 AM
it is normal for the idle to increase when the AC clutch is engaged. Can you have the car idle with the ac on and see the clutch, and if the clutch is spinning is the idle at 850? If it is then you have your answer.
flewthecoupe
05-12-2005, 03:19 PM
Alot also depends on how often it cycles...
likhootch
05-12-2005, 04:24 PM
Alot also depends on how often it cycles...
I didn't say it was th eall inclusive answer, but is a step down the problem solving path.
Another possibility is to take th ecomputer out of the loop, and see if the idle varies. On my EEC-IV there is a jumper (grey plug) that you can remove which allows the engine to run without the computer changingthe timeing, this lets you check the base timeing and you can see what the base idle speed is. I ithink unplugging the idle air bypass valev will do the same thing. Someone can help me out on this one? Good luck.
I didn't say it was th eall inclusive answer, but is a step down the problem solving path.
Another possibility is to take th ecomputer out of the loop, and see if the idle varies. On my EEC-IV there is a jumper (grey plug) that you can remove which allows the engine to run without the computer changingthe timeing, this lets you check the base timeing and you can see what the base idle speed is. I ithink unplugging the idle air bypass valev will do the same thing. Someone can help me out on this one? Good luck.
flewthecoupe
05-12-2005, 05:18 PM
I was adding on to your post, not detracting, sorry if it was confusing.
Should have come across something like this:
"it is normal for the idle to increase when the AC clutch is engaged. " "Alot also depends on how often it cycles..." (as to whether or not you have normal operation.)
Should have come across something like this:
"it is normal for the idle to increase when the AC clutch is engaged. " "Alot also depends on how often it cycles..." (as to whether or not you have normal operation.)
likhootch
05-19-2005, 10:41 AM
I was adding on to your post, not detracting, sorry if it was confusing.
Should have come across something like this:
"it is normal for the idle to increase when the AC clutch is engaged. " "Alot also depends on how often it cycles..." (as to whether or not you have normal operation.)
Sorry If I sounded touchy, didn't intend it to come across that way either. Thanks for the help, and should help me diagnose mine in the future. Thanks.
Should have come across something like this:
"it is normal for the idle to increase when the AC clutch is engaged. " "Alot also depends on how often it cycles..." (as to whether or not you have normal operation.)
Sorry If I sounded touchy, didn't intend it to come across that way either. Thanks for the help, and should help me diagnose mine in the future. Thanks.
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