Idle speed varies
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Tuned
Joined: Jan 2004
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From: B.C.Canada, EH?
Idle speed varies
'93 Aero*,4.0L,auto,AWD. Whenever the A/C compressor kicks in, the idle speed actually increases. When the compressor kicks out the idle drops. Is there an adjustment somewhere to equalize out the A/C on and A/c off idle speeds?
Thanks all.
Thanks all.
Thread Starter
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Tuned
Joined: Jan 2004
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Likes: 1
From: B.C.Canada, EH?
Ok. I thought there might be a solenoid or "kicker" to just increase the idle speed enough to compensate for the compressor coming on, not making the engine actually idle at a higher speed. When the A/C kicks in at a light, it physically jerks the van forward.
Last edited by AerostarDad; Apr 18, 2007 at 01:32 AM.
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Tuned
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From: B.C.Canada, EH?
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Post Fiend
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From: Washington state
How The Circuit Works
The Electronic Engine Control (EEC) System uses a Powertrain Control Module (PCM) to control fuel flow, exhaust gas recirculation (EGR), ignition system functions, evaporative emission, idle speed, engine cooling, and transmission controls.
The A/C Signal is received from the A/C system at pin 10, which informs the PCM when the A/C clutch has been turned on. Under certain conditions, such as heavy engine load, the PCM will ground pin 54 to energize the WOT Cutout Relay. This deenergizes the A/C Clutch Field Coil and disengages the A/C Compressor, reducing engine load.
The Electronic Engine Control (EEC) System uses a Powertrain Control Module (PCM) to control fuel flow, exhaust gas recirculation (EGR), ignition system functions, evaporative emission, idle speed, engine cooling, and transmission controls.
The A/C Signal is received from the A/C system at pin 10, which informs the PCM when the A/C clutch has been turned on. Under certain conditions, such as heavy engine load, the PCM will ground pin 54 to energize the WOT Cutout Relay. This deenergizes the A/C Clutch Field Coil and disengages the A/C Compressor, reducing engine load.
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Thread Starter
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Tuned
Joined: Jan 2004
Posts: 325
Likes: 1
From: B.C.Canada, EH?
96...thanks for the explanation, but, this is happening at idle,not WOT. in my case,does the PCM tell the IAC module to let more air through to increase the idle speed when the compressor goes on?
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