Question about Air Conditioning and Heat for Pontiac G6

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Engine revs up and down when airconditioning is on

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The ac compressor takes around 5 hp to drive so when the clutch engages the idle speed will drop around 250rpm amd when the clutch dis-engages the rpm will rise 250 rpm If you have a efi computer controlled vehicle the computer should automatically adjust the rev difference to maintain a constant rpm. If you have a carby vehicle there is a electric over vacuum control that you can fit to the accelerator lever that when the clutch activates the power to the switch from the clutch opens a valve that allows vacuum to pull the throttle open and maintain a constant rpm

Posted on Aug 02, 2013

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Posted on Jan 02, 2017

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I have a 96 1200 bandit.when cold it revs up and down as it shud do but once warm when u let off the throttle and change gear the revs take few seconds to go down the engine still revs on etc. carbs av...


When a engine is cold the revs should be higher ( choke on ) but nit going up and down. If you release the accelerator and the engine still rev's up maybe the accelerator cables are not properly installed on the carbs. Also a air leak is possible. Check the cables and air leaks at manifold including the holes from manifold where vacuum gauges should insert when carb calibration is necessary. Those holes should have some caps on.

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2003 ford escape V6 idles 1000rpm, then drops over 5 seconds and then cycles back to 1000rpm...i recently had alternator replaced. I have regular oil changes. New gas filter. It sounds like something...


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Hi there,

This sounds like an electrical issue.

You will need to extract the diagnostic codes from your vehicle's computer.

This can be done in the following manner:

** Firstly, attempt the first part of the procedure with engine running **

- With gear lever in PARK, start engine and rev up to 2,500rpm, then gradually reduce revs down to idle speed (ie take foot off accelerator).
- Cycle gear lever through the gears (ie down to 1st, then back up to PARK)
- Turn Airconditioning to ON, then OFF
- Turn engine OFF

- Within 5 seconds, turn the Ignition Key in this sequence: ON - OFF, ON - OFF, ON (leave key in ON position)
- If done correctly, a series of 4-digit codes will appear in your ODOMETER display

** Remember, you must complete the ignition key sequence, within 5 seconds.

Please advise which codes appear and I will assist you futher.


Cheers,

Scott

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I have a Dodge intrepid that keeps leaving me stranded. My car just cuts off on me. While I'm driving. Sometimes while my car is in park. It just CUTS OFF! I've noticed lately that as my temp gage...


Hi there,

If you're willing, we can try checking your computer for trouble codes - this will help identify any electrical issues.

Note: there's a 50/50 chance this procedure will work (as this does work on the 1997 model):

- With gear in Neutral, start engine and rev the car to 2,500 rpm, then 'gradually' reduce revs down to idle speed.
- with park brake secure, slowly cycle the gear lever through each position (down to 1st, then back up, ending in Park)
- turn Airconditioning ON, then OFF - turn engine OFF - Within 5 seconds, perform the following Ignition Key sequence (without starting): ON, OFF, ON, OFF, ON (if done correctly, your ODOMETER should display a series of 4-digit codes). Please reply back once you have your codes..... Cheers,

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Check to ensure that the overdrive is on or you will be running at high revs in top gear.
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radiator partially blocked.
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Fan not coming on with or without aircondition and


Engine fan will only kick in when engine is hot and needs extra help in cooling down, If it doesn't come on so long as engine temp remains ok i shouldn't worry about it too much..

Jun 22, 2010 | 2001 Volkswagen Golf

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Revs up and down at low revs


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Why when i turn on air condition it is slow down


some of the energy of your engine is used to run the airconditioning (pump etc). Mine does the same, its normal on smaller cars

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