When I turn my AC on the engine act like it wants to stop running, give gas it will run but engine get hot in fact I got a code P0128 (temperature sensor) reset and did not turn on AC and got no code engine did not get hot and the engine ran fine, what could be the cause of this, my AC unit?
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Re: engine wants to stall
You need to Clean the throttle body bore and the throttle valve plate using a clean shop towel and some carb cleaner. The DTC P0128 is Engine Coolant below the minimum thermostat regulating temperature. You need to replace the thermostat, it comes as an outlet housing assembly. You will have to remove the alternator to gain access to this housing.
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The first thing you need to do here is have the computer control system scanned for fault codes and an have a engine running test done to see what is going on in the automatic idle speed control system.
No to the high octane gas. Regular gas is fine. Higher octane gas is more resistant to ignition and is better suited for high compression engines to prevent preignition and detonation. Check or replace your idle air control valve since the car stall at idle when the throttle blade is closed. If the IAC is not working it won't allow for air to bypass the throttle plate. Also have your throttle body cleaned.
by running out of fuel there is damage done to the little plastic gears in the fuel pump. I would say that the misfires are now the result of insufficient fuel supply and pressure to run the injectors. IT would also account for why there is insufficient power to run the ac compressor
does the temperature gauge show engine is very hot? could be a stuck thermostat, did you check for engine codes? this can be checked for free at most chain auto stores and give you insights into the problem.
I suppose you have done the obvious things like clean the battery terminals and make sure they are tight. Check the alternator for output as an intermittent low charge rate will upset the cpu performance. Check the connector for the fuel pump as the wire may be loose and causing a problem in the fuel pump. Is the idle rpm around 900 or a lot slower say 600rpm. Try writing down all the things going on when it happens. slope.- hot day-lights on-noises foot on brake- ac on. For example if the idle speed is low and the ac compressor cuts in then the engine will stall. If the battery has a failing cell and the lights are on then there may not be enough power from the alternator at low idle to supply all the power needed to run the cpu. Think of all that is going on and there will emerge a common area that will point to the fault.
Try disconnecting the battery (both terminals and let set for a few hours) with ALL the accessorries on lights-heater-radio etc. This will draw all power from your system, then recconnect battery, it's worth a try even if it doesn't solve your problem. Bill