I have a 1989 Mercedes that has a rebuilt motor in it out of a 1991 model
Been driving fine but this morning I went out to start the car and it will crank and start but it will not stay running after I take my foot off the gas.
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the idle control motor probly worn-on the throttlbody--also the tps sensor - get intake area inspectd--a haynes manual will xplain complete car-partstore hazit--------starter fluid is used for low compression or weak spark
catalytic converter is clogged basically its stopping up your exhaust. Over time the pressure will slowly vent out, allowing your car to start, only to build up the backpressure again, stalling engine.
One thing you can try since it starts good in warm weather, is to ,on a cold morning, take a hair dryer and warm up the suspect part to warm weather condition. Then try and start the car. If it start ok you have probably found the weak part.
Some cars cut off as a fail safe to overheating especially on newer cars. The computer controls the fans and if they are not working the computer is probably telling the car to shut off. Have you replaced the motors already, if not, this is what's happening. Once you replace the motors it should run fine. I wouldn't suggest driving it too much with this problem as it may affect the computer by giving it false info.