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00 Chevy cavalier misfires bad when turn on AC but runs fine without AC on

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  • 35 Answers

How long since spark plugs changed?
air conditioner works well? Maybe compressor going bad causing excessive load on engine bad electric clutch on compressor drawing down charging system .
Alternator ok?
battery condition? 13.6v DC or more

Posted on Apr 25, 2017

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Posted on Jan 02, 2017

scott gibson
  • 34 Answers

SOURCE: 1988 chevt chevy cavalier

visually check crank sensor(common problem)
check for fuel pressure on fuel rail there is a shrader valve for that. pull a spark plug wire and confirm spark.
make sure air box isnt plugged.

if all that is good change the control module. good luck hunting

Posted on Jun 30, 2008

  • 1 Answer

SOURCE: 2002 Chevy Cavalier

Most probable cause is a bad BLOWER MOTOR RESISTOR (BMR). This part is located underneath the right side of the dash mounted into the blower motor housing. The BMR has a circuit board that is suseptible to corrosion and moisture damage because it is in an enclosed area with much condensation. After replacing it a couple of times, the 3rd time I dipped the circuit board in TOOL DIP - the stuff you rubber coat screw drivers with - have not had a problem since (3 years).

Chris Musanté

Posted on Mar 27, 2009

soc21610k
  • 215 Answers

SOURCE: 2001 Chevy Cavalier Misfire

Have you made sure your getting spark on every cylinder from the coil pack?

Posted on Jun 04, 2009

  • 55 Answers

SOURCE: 97 Chevy Cavalier misfiring

Sounds like it's you spark plug leads. Depending which engine you have in there, if you have the 2.4L then it is a module.

Posted on Jun 27, 2009

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Molson02536
  • 3854 Answers

SOURCE: 89 Chevy 2.8L #3 & #6 misfire.

The ignition modulator may have to be replaced, you can pick one up at Auto Zone and it's still pretty expensive so you may want to try the Salvage yards. The ignition modulator's are common interchangeable part for the GM line so you can get one from a newer car then your 89 cavalier. Good luck and hope this helps. I believe Auto Zone can also test the ignition modulator too, the modulator is what the coils sit on. 

Posted on Sep 04, 2009

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2004 chevy caviler ,working fine ,then engine light blinking,shaking when stop at red lights,little louder sound smell,tail pipe,i never put oil in the car,would that be a reason ?


Engine light blinking,shaking Has a misfire bad enough that will damage the catalytic converter . Bad coil's , plug's , ignition module going bad . Have the vehicle checked for DTC'S diagnostic trouble codes .

Mar 16, 2017 | 2004 Chevrolet Cavalier

1 Answer

Runs smooth then runs rough & rough back to smooth running.


If your check engine light comes on get it checked. To me it sounds like an engine misfire probably cause by a coil pack or spark plug wire going bad. The misfire should cause the check engine light to come on maybe even flash if the misfire is bad enough

Aug 19, 2015 | 1996 Chevrolet Cavalier

1 Answer

I have an 01 chevy caviler. it has been sitting for about 2 years my son drove it for the first time today. when he turned on the a/c the car went crazy check gauge light came on all gauges started turning...


CODE P0300 refers to random/multiple cylinder/s ---misfire detected===causes--spark plug/s---HT lead/s--injectors/s---ignition coil/s---low compression---wiring-
It appears that the ac compressor had a bit of a spit in the fact that it was probably seized either internally or in the bearing behind the pulley. Not using an ac for such a long period of time leads to problems with the seal drying out. The fact that the engine runs good without the ac indicates that the fault is in the ac wiring and system so I would have it checked out by an accredited ac mechanic.

Jan 18, 2014 | Chevrolet Cavalier Cars & Trucks

1 Answer

I own a 2002 chevy cavalier and my "Check "Gauges" light is on...why is it on ?


you PCM has spot a problem in the engine control system.you have bad sensor or EVAP leak or cylinder misfire.any auto parts store will code scan vechicle see what cause check engine light to flash on.they will code scan vechicle free go by auto zone.

Mar 30, 2013 | 2002 Chevrolet Cavalier

1 Answer

2002 Chevy Cavalier misfire


You may want to check for fuel volume and fuel quality. There may be moisture in the fuel. It would also help to know which cylinders it is misfiring on. Scan tool will show the misfire on live data.

Nov 24, 2012 | Chevrolet Chevy Cars & Trucks

1 Answer

1999 chevy cavalier. wasn,t getting heat to inside. put in new thermostat. heated up fine for a couple of miles, then cool air. shut off when got back home. anitfreeze was bubbling back out of reservoir....


make sure you get ALL the air out run it without cap until you see water circulate turn heater to hot NO FAN ABOUT 5 MIN close cap ,see if that works

Nov 29, 2010 | 1999 Chevrolet Cavalier

1 Answer

When i first start out when driving my 1994 chevy cavalier i step on the gas and it hesitates for a sec but then runs ok.this happens almost everytime i start out i had the fuel pump tested and it tested...


If it is the spark wires you get a misfire code, and probably the CEL.
Read codes, check vacuum system and sensors.

let me know if you need more help with the issue.

Aug 18, 2010 | 1994 Chevrolet Cavalier

1 Answer

I'm getting a code P0300 On my wifes 2003 Chevy Cavalier


That indicates a cylinder misfire. Could be a bad plug or a bad or dirty fuel injector.

Jul 15, 2009 | 2003 Chevrolet Cavalier

1 Answer

2001 Chevy Cavalier Misfire


Have you made sure your getting spark on every cylinder from the coil pack?

Jun 03, 2009 | 2001 Chevrolet Cavalier

1 Answer

1998 Cavalier No Spark in cylinders 1 & 4


ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Jan 13, 2009 | 1998 Chevrolet Cavalier

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