1991 Ford Escort Malfunction - General

Question: Hi: I have a 1991 Ford Escort, 1.9L engine, o/d auto transmission, with numerous problems. When starting in cold weather, engine chugs bad, and black debree comes outs of the exhaust. Engine will die after a few momemts if accelerator is not used to keep it running. Once engine has warmed, it runs. However, when very cold outside, it seems that the engine does not fully warm up, the fast idle does not come off until engine is shut off and let stand for a few minutes, then idles at proper speed. At this point I often have fluctuating rpms (no matter when the season)when at stop signs/lights with some surging involved. On to the transmission. It shifts very harshly. Mostly from low to second, however all the shift levels shift harshly. Sometimes even down shift is harsh. So far I have replaced the thermostat, o2 sensor, egr valve and both senors/controllers, head and intake gaskets, timimg belt and gears. I have looked for a MAP sensor, but can't find one. I replaced the transmissiom fluid, seals, and screen. It does not have a normal shift modulator, but is there an electronic one tied into the computer?

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Technican: Have you checked for troublecodes? Do an internet search for- 'Ford Trouble Code Diagnostics' for instructions. Some auto parts stores will pull the codes for free. Try calling Autozone, Advance auto, Partsamerica, etc and see if they will pull the codes for you. Let us know what you find.

Technican: Your car uses a MAF (mass airflow sensor) instead of a map sensor. Info on all the sensors is available at the link below. If the engine is not running right it can cause the shifting problems you are having. Fix the running problem with the engine first. You may have a problem with the TPS (throttle position sensor), these gave some trouble. Highlight, edit, copy, and paste this link into your address bar to for instructions- autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/13/c0/0e/0900823d8013c00e.jsp You may also have a problem with coolant or air temp sensors. To test these visit this link from the same site and click on the sensor in the list- autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/13/bf/57/0900823d8013bf57.jsp Also make sure the thermostat is working okay, a bad thermostat can cause an array of engine and transmission problems that can allude mechanics.

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