Having problems with your 1997 Chevrolet Express ?
No power and speedometer swings between 0 and 90 mph while van is barely moving
\015 It seems to be on limp mode but no code\015
The engine\012and transmission in this cars drive train are fully\012electronically controlled by a computer called the PCM (Power Train\012Control Module). Whenever a problem like this occurs the computer\012stores a record of the problem (there are of course some exceptions\012to this, like the fuel pump, engine coolant teperature sensor and MAF\012sensor for instance) in the form of a fault code in its memory, to\012read these fault codes you must have the systems memory scanned with\012a special tool. Once the fault code(s) are read you then must perform\012the appropriate diagnostic testing to find and resolve the problem(s)\012DO NOT REPLACE ANY PARTS UNTIL THE DIAGNOSIS & TESTING IS\012COMPLETED.
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