Driving in parking lot is the worst. Tap gas peddle then let go while in gear to move, then let go,it will stall(when hot),or moving slowly with lite application,spudders like its fully choked. Clears when more throttle is used. Did full tune-up (plugs,cap/roter,filters), fuel pressure is 10psi,and even changed temp.sensor(for computor) . EGR holds vaccum ,and scaned ecm,....no codes.any ideas while be helpful.
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Re: wants to stall with lite gas peddle application
You could check and clean throttle body and iac control, see if it helps? Check the throttle position sensor. Does the fuel injector spray pattern look ok?
I would want to check fuel trims, to see if running rich or lean? Any more the 02 sensor is part of a tune-up.
Do you have good engine vacuum at idle? If this a high mileage engine, I'm not sure it will ever run perfect?
I don't know litre size of engine?
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Well this could be a number of things. A rusty gas tank. A bad fuel filter or pump. A short in the brake light system. I would try this. In a parking lot Empty parking lot . While moving Try just lightly touching the brake pedal just enough to engage the Brake lights and see if it does want to stall. If it does i would check the brake light system. Was there an alarm system installed? The lights are connect to it. That's the first thing i would check. Most alarm installers tend to tap into wires for power under the dash that they really shouldn't. This could cause all sorts of problems.
At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.
Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.
If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?
It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.
Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.
Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..
The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.
Are you driving an automatic? It sounds like the clutch plates inside your transmission may be slipping. Yes, automatics have small clutch plates between each gear whereas a standard has one big clutch plate