Idle hang with a/c on?
Thread Starter
Staging Lane
Joined: Jan 2015
Posts: 81
Likes: 0
From: Portland, TX
Idle hang with a/c on? Hey guys ,2002 m6 camaro with 233 239 cam,I've been having idle hang
when a/c is turned on,I can be sitting at idle and turn the a/c on then rpms jump up to 1800-2000, turn a/c off and it goes away, replaced i.a.c ,still does it,I do have hp tuners but,I'm very new to using it? Can yall help me out,I don't really know what I should be lookin for in the tune to fix this issue,?
Thanx
when a/c is turned on,I can be sitting at idle and turn the a/c on then rpms jump up to 1800-2000, turn a/c off and it goes away, replaced i.a.c ,still does it,I do have hp tuners but,I'm very new to using it? Can yall help me out,I don't really know what I should be lookin for in the tune to fix this issue,?
Thanx
Go to hptuners.com/forum and do some reading in the getting started threads. Don't just come on here and ask to be spoon fed. There are folks on here that can help with specific questions, but we also get paid for tuning cars. I don't mind helping people that are trying to learn, but a comment like how do I post a tune shows that you haven't put in any effort yet.
That's a big overlap-y cam and has probably really bent
your real motor VE, the VE table has probably not been
trued up and the model for motor torque vs added air
is also way off. This latter comes into play via the A/C
drag torque -> "add air to compensate" mechanism.
The A/C drag torque is unchanged but the motor
response to it, has. You are evidently adding more
than it needs and more than the closed loop idle RPM
control can pull back out (though, do you give it the
time it might need, to do so? Let it sit, and see?).
This can also be aggravated by manifold air (vacuum)
leaks, skewing the entire controlled-air-mass vs IAC
relation beyond the control range when adder-air is
pushed (maybe just barely in control when A/C off).
Look to your IAC counts, if they are bottomed out
then look for a gross air leak. If hovering in the control
range (100-200-ish) then this idle RPM pedestal is
wilful (just jacked).
your real motor VE, the VE table has probably not been
trued up and the model for motor torque vs added air
is also way off. This latter comes into play via the A/C
drag torque -> "add air to compensate" mechanism.
The A/C drag torque is unchanged but the motor
response to it, has. You are evidently adding more
than it needs and more than the closed loop idle RPM
control can pull back out (though, do you give it the
time it might need, to do so? Let it sit, and see?).
This can also be aggravated by manifold air (vacuum)
leaks, skewing the entire controlled-air-mass vs IAC
relation beyond the control range when adder-air is
pushed (maybe just barely in control when A/C off).
Look to your IAC counts, if they are bottomed out
then look for a gross air leak. If hovering in the control
range (100-200-ish) then this idle RPM pedestal is
wilful (just jacked).
Go to hptuners.com/forum and do some reading in the getting started threads. Don't just come on here and ask to be spoon fed. There are folks on here that can help with specific questions, but we also get paid for tuning cars. I don't mind helping people that are trying to learn, but a comment like how do I post a tune shows that you haven't put in any effort yet.
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