305 TBI: correct idle speed?
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Joined: Nov 2015
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Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 4 Speed Automatic
305 TBI: correct idle speed?
I have a 1991 Camaro 305 TBI. It seems like the idle is kind of low to me. When it's in park and warmed up its at about 750 which seems good to me,but when it's in drive and I'm stopped at light or something th idle is 500-525 tops without cooling fan,A/C,radio,or headlights on. The car sputters a little bit while I'm stopped,and if the cooling fan or A/C clutch kicks on the car nearly stalls,and sometimes it has.
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From: Chasing Electrons
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Re: 305 TBI: correct idle speed?
Sounds correct. In P/N there is no set idle RPM, just an upper and lower limit.
In drive the desired idle RPM is set at 525, with a +-25 RPM dead-band (AXKT).
As for the RPM dip when the A/C kicks in, it could be a sticky IAC. The A/C on has an IAC bump to help prevent this. I don't believe that the cooling fan does as it isn't controlled or monitored by the ECM.
RBob.
In drive the desired idle RPM is set at 525, with a +-25 RPM dead-band (AXKT).
As for the RPM dip when the A/C kicks in, it could be a sticky IAC. The A/C on has an IAC bump to help prevent this. I don't believe that the cooling fan does as it isn't controlled or monitored by the ECM.
RBob.
Thread Starter
Member
Joined: Nov 2015
Posts: 152
Likes: 0
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 4 Speed Automatic
Re: 305 TBI: correct idle speed?
Sounds correct. In P/N there is no set idle RPM, just an upper and lower limit.
In drive the desired idle RPM is set at 525, with a +-25 RPM dead-band (AXKT).
As for the RPM dip when the A/C kicks in, it could be a sticky IAC. The A/C on has an IAC bump to help prevent this. I don't believe that the cooling fan does as it isn't controlled or monitored by the ECM.
RBob.
In drive the desired idle RPM is set at 525, with a +-25 RPM dead-band (AXKT).
As for the RPM dip when the A/C kicks in, it could be a sticky IAC. The A/C on has an IAC bump to help prevent this. I don't believe that the cooling fan does as it isn't controlled or monitored by the ECM.
RBob.
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