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AnswerTurning on the air conditioner causes increased engine load. This load can trigger a faulty ignition part to cease operating, resulting in a misfire and vibration. If there is an internal problem with the catalytic converter or the heat shield is loose it will vibrate. Note that misfires greatly accelerate the death of a catalytic converter. More likely (if this is a GM truck) is bad valving internal to the Air Conditioning Compressor. It varies load so quickly that the belt tensioner shakes violently and that creates both a noise and a vibration.another answerIt could be the clutch on ur a/c that is rattling have it checked
Check to see that your catalytic converter is not full. Otherwise get your engine tuned up.
Maybe fuel filter Maybe plugged catalytic converter
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loss of power under a load is a great indicator of a clogged catalytic converter
A clogged converter will cause the engine to loose power and act as though you are pulling a heavy load. The engine will not miss as if you have a bad cylinder. You will basically have no power.
TL stands for truck load like LTL is less than truck load. It means it a complete truck load by either weight or volume.
TL stands for truck load like LTL is less than truck load. It means it a complete truck load by either weight or volume.
It's possible that the catalytic converter is restricted. A good repair shop should be able to find out.
This is when the load has no connection to the ground.
Clogged catalytic converter or y-pipe. I had the same problem. Also, if you smell rotten eggs or have lack of power under load as symptoms as well, I can almost guarentee it.
Depends on the truck