Question about GMC S-15
There are lots of possible causes. It could be either of the following:
2. Valves in the transmission
3. The engine
4. The Oil - maybe it needs oil change
5. Broken vacuum hose.
Under the car, look for a missing or broken vacuum hose. It's supposed to connect to the transmission about 2/3 the way back on the right side. This hose may have fallen off, have a hole in it, or be disconnected from the vacuum source in the engine.
Hope these info helps and have a great day!
Posted on Jul 29, 2009
First thing to check and also the least costly when you have this problem is the transmission oil level, as missing just a few onces of oil in an auto transmission can cause some pretty weird problems. If the oil level is OK, then second most common and least costly is what we commonly call the PRNDL switch, or position switch, which is located on the transmission casing and is visible from the outside of the tranny without taking it apart. Basically, the switch tells the car what gear it is supposed to be on considering the shift lever placement. If the PRNDL switch is OK, then unfortunetly the problem resides within the solenoid valves in the tranny and will require costly parts and labor. So if this is your case, depending on the year and mileage of the vehicule, it might be a wise choice to start looking for a newer vehicule.
Posted on Jul 28, 2009
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Posted on Jan 02, 2017
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