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Re: engine is jerking when ac starts
Rpm should go up when A/C turned on ,the control for that is built in to the engine management system,sorry back hurting sitting at computer ,take to dealers for the computer to be checked ,might just be something simple
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Sounds like an overheating problem or lubrication problem. If after it dies you can let it sit for a period to cool down it is most likely a cooling issue. Try removing the Thermostat and see if that seems to help. The thermostat may not be the problem as it could be the water pump not circulating radiator fluid. The reason it takes longer with AC off than with it on is because the strain on the motor is greater with the AC in the On position. Since you didn't mention an overheating issue it is probably a combination of a bad sensor and either faulty Thermostat or faulty water pump. Your also going to want to do a compression check on all cylinders to see if your running high compression on 2 or more indicating a crack in the cylinder wall or a blown head gasket. Lastly there is the oil pump, if that is not circulating oil correctly you will have a lubrication issue that will give you this symptom. If you haven't done so of late do and oil and filter change using gunk engine cleaner additive. This is added to the oil then the engine is run for 5 minutes, then drained. You have to change the oil filter when you use this as running the vehicle with this in the engine will damage the seals.