Guests - If You want access to member only forums on HSO. You will gain access only when you Sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

  • RECEIVE THE GIFTS MEMBERS SHARE WITH YOU HERE...THEN...CREATE SOMETHING TO ENCHANT OTHERS THAT YOU WANT TO SHARE

    You know what we all love...

    When you enchant people, you fill them with delight and yourself in return. Have Fun!!!

Sign in to follow this  
Fishinguy40

Misfire with A/C On

Recommended Posts

2000 Malibu, 3.1 liter. Got home last night and the wife informed me that the last couple days while it was really hot and she had the air conditioner on that the car hesitated/jerked as she was driving and the check engine light began to flash. She turned the A/C off and car drove fine. This happened twice. Both times turning the A/C off corrected the situation, according to her.

The hesitation/jerking along with the check engine light flashing tells me that the car was experieincing a misfire. I haven't had a chance to get up to an auto store and read the codes but figure that I might only get a random misfire, which won't tell me much. Also figure if it was bad enough to cause the car to hesitate/jerk that it was probably more than one cylinder.

Any ideas why it would misfire only when she is running the A/C?

Share this post


Link to post
Share on other sites

It sounds like it could be possibly bad spark plug wires due to the load on the motor with the a/c on.

Share this post


Link to post
Share on other sites

It should give a specific cylinder(s) if the light was flashing. Just to thruohg out some other ideas If it is a specific cylinder and it is fine after the car cools down and only acts up when its hot i'm going to say fuel injector for whatever cylinder is affected. The good thing is that if it is one cylinder and its acting up you can usually hear them not working if you use a long screw driver as a stethascope. If it isn't working a light tap with the screw driver will usually get it working again and/or confirm the bad injector.

Otherwise I am on board with the tune-up suggestions.

Share this post


Link to post
Share on other sites

could be the electric cooling fan not coming on or barely coming on. carefully reach in with engine off and key out of ingition and move the fan. use gloves as the blades are sharp. any side to side movement or if you can shake it could be the cause. there should be a plug ontop of the shroud that you can take apart, and the fan should lock into the on postion. you can then hear if it is dragging without possibly cutting yourself too. good luck.

Share this post


Link to post
Share on other sites

could be the electric cooling fan not coming on or barely coming on. carefully reach in with engine off and key out of ingition and move the fan. use gloves as the blades are sharp. any side to side movement or if you can shake it could be the cause. there should be a plug ontop of the shroud that you can take apart, and the fan should lock into the on postion. you can then hear if it is dragging without possibly cutting yourself too. good luck.

Not sure what that has to do with a missfire? Maybe if the car was overheating. You might be thinking of another problem on a completely different vehicle?

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  



  • Your Responses - Share & Have Fun :)

    • Had 3 long beards come out gobbl8ng and running but not to me.  Had them all fired up but they obviously had another destination in mind.
    • I didn’t know grackles fished either.  Interesting. 
    • Was checking back to see you with a bird pic @Borch
    • So this is not a new thing!  Interesting.  I keep finding more and more complex behavior in so many of these "dumb" animals!  So many of them are anything but dumb.
    • When I was a kid, we used to have a pond in our yard. We would keep fish and minnows in there. The grackles would clean in out! We had to resort to putting a cover over it.
    • Last Thursday on a visit to my sister in Rock Rapids IA, we made a circuit through the Island Park there.  At the low dam just past the former railroad bridge which is now a walking path we saw a group of grackles fishing at the edge of the white water where it ran against the rocks at the shore line.  There probably were a dozen or so all told moving back and forth and some on the rocks at the other shore line.  In something like half an hour or less we saw various of the birds bring out minnows and eat them on the shore to a total of at least 8.  They also contested for the better fishing spots and tried to horn in on other birds' catches;   they would fly out to quite a bit up on shore with a catch to eat it there. I never expected to see grackles fishing.  I never heard of that before, but then it wouldn't be the first time I didn't know about something relatively common.
    • I've seen deer there, too.  I go by there on my way to work about 3:30 am S S & M.
    • Now they're gobbling...  seem to be getting a little closer.
    • Very quiet so far.  Maybe one distant gobble on the roost but couldn't tell for sure. At least the mosquitos seem to have calmed down in the last 10 minutes some.