Question about 2009 Toyota Camry

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My 2009 camry has started idling rough only when ac on. You can feel it really bad when braking, stopping, letting off the brake to go or slowing down. It only happens when ac is on. What could this be?

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When the AC is switched on, the engine has to rev up by few hundred RPM to take up the additional load of the compressor.
So the fuel pump will change settings to supply the extra power for the engine.
Hence it is important that you get the engine tuned up as the idiling speed must be adjusted and then the idling while AC come ON.
Tune the Fuel with the AC switched OFF , on activation the engine gets the signal to rev up.

Posted on Aug 22, 2010

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Posted on Jan 02, 2017

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I have 1999Chevy suburban with 6.5 turbo diesel motor.it idles up and down and when driving the gas pedal is real touchy Wat is the problem and were do i locate the problem


Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

Mar 01, 2012 | 1999 GMC Suburban

1 Answer

Car shut down when foot not on the accelerator


For this types of problem,there are few help links.I suggest you to click the link below and go through the troubleshooting procedure :-----Car only starts when gas pedal is pressed? http://technoanswers.blogspot.com/2012/01/car-only-starts-when-gas-pedal-is.html-----------Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
----------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
----------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down? http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html
-------------Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html----------This will help.Thanks.

Feb 02, 2012 | 2002 Toyota Camry

1 Answer

My 95 nissan maxima is idling rough and then stalling when i let off the gas or am stopped at a light or stop sign; i have replaced the coolant temperature sensor, not it. Took it to the nissan dealership...


the problem is fuel related and nowhere else
it indicates a vacuum leak , either at the manifold , brake booster , transmission actuator hose/unit for the transmission or hoses that control under that dash
bad at stopping at light indicates that it is the brake booster
simple test is to put the hand brake on, start the engine and if it idles ok , put your foot on the brake
if still ok move vent controls ,
if with the foot on the brake it plays up , replace the brake booster

Apr 22, 2017 | 1995 Nissan Maxima

1 Answer

1998 4Runner - rough idle, engine light on (blinking, at times), sometimes when I step on the brake it brakes quickly rather than to a slow stop


The first thing I would do is to go and get the service light checked out. You can go up to an auto parts store (Autozone, Advance Auto Parts, or O'Reilly's) and they can scan your truck's computer for the trouble codes. This can really help in shedding some light on why your engine is idling roughly, although sometimes a rough idle can be caused by little things like bad fuel or needing a tuneup. As far as your brakes go, it is a good thing that your brakes stop your truck quickly. It is when your brakes slowly stop your truck, you should start to worry. Just adjust how much pressure you apply to your brake pedal.

May 29, 2011 | Toyota 4Runner Cars & Trucks

1 Answer

Actually it's a 2000 Escort Coupe ZX2 and it's been idling very rough as I slow: several times has died. My oil is clean and replaced new apprpriate spark plugs just prior to this growing condition. I...


as you slow down you have your foot on the brake and that means that the brake booster has a vacuum leak is causing the rough idling and stopping
before you spend a dollar have that checked out by starting the engine ( hand brake on) and if it idles ok , the apply the foot brake and it plays up , it is a brake booster vacuum leak problem
the fix in that case is a replacement brake booster

Apr 25, 2017 | 2000 Ford Escort

1 Answer

My 94 honda accord ex idles rough when i come to a stop with the brakes applied , almost like it dose when the ac is on.


You need to start using high octane gasoline. Yes the 96 or the 93 not the 89. It costs a little more but it is worth it as it is better for your car and it runs better idling. The brake pads sound "rough" they probably need to be replaced or switched/flipped. This is a cheap and easy task. It may shudder from the fact that it is getting force feedback from the brakes.

Mar 15, 2011 | 1994 Honda Accord

1 Answer

I have a 1994 Honda Accord 4 door v6. I have rough idle when in drive and smooth idle when in neutral. Also rough take offs from a stop or slow speeds. If I pump the gas pedal a few time the rough take...


  • does the engine miss? bumps is a rythmic pattern?
  • an engine miss will appear to diminish at higher rpm due to centrifical force.
  • other possible problem broken or flat motor mount.
  • is the idle rough in reverse?
  • if not
  • open hood
  • start engine
  • Left foot on brake (hard)
  • start engine
  • watch engine as you select drive
  • still holding brake with left foot / throttle gas with right foot
  • does engine dramatically move?
  • if so replace motor mount on offending side
  • if not possible engine miss or transmission problems

Jul 10, 2010 | 1994 Honda Accord

1 Answer

I have a 2000 4 cyl. automatic Camry with 52,000. Recently, the car has developed a rough idle and it stalls. This occurs when the engine is hot and I slow the car down at a stop light or it stall as I am...


try disconnecting the hose to the brake booster and plugging it, the take it for a drive, ( you won't have power brakes so do this in a empty area)

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1 Answer

Top speed 20 mph


If this vehicle is a 2009/8 model then whatever is wrong with it will be under warranty.

Dec 20, 2009 | 2009 Chrysler Town and Country

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