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Cadillac Repair/1993 deville tranny
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Question
I have a 93 deville 4.9 with 120k miles. When cold, tranny runs fine, after 20 minutes or so, service engine lite comes on then if I am cruising (55mph or more) the tranny shifts down to 3rd. If I stop after the ses lite comes on, starting up forward shudders a few seconds. A friend said it might be the solenoid(s) in tranny. Fluid full, not burnt. Engine well maintained, all filters and fuel system recently replaced and cleaned out, only use superunleaded. Please help! Thanx!
Hi,
Your engine and transmission work together with the computer.
Even though the service engine light is off now, the computer saves a diagnostic code.
These are easy to get the diagnostic code by crossing 2 wires with a paper clip under the steering column under the dash. I just don't remember the 2 terminals. The computer diagnostic port is on the black hush panel directly under the column. You will see a outward bulge. You pull down that plastic and you will see the terminal.
If you are going to keep the car, code readers are at Auto Zone pretty cheap and make sure you tell the parts guy its for a 1993 because 1994 is different on up called OBD II. You have U guess an OBD I.
The service engine soon tells you there is an emissions issue which means the computer is not in closed loop. This can affect transmission shifting, engine running all depending on the cad you find.
http:;;www.autotheftexpert.com
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Rob Painter
Expertise
Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?
Experience
Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.
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