The OBDII system is used in 1995 and later model vehicles. An OBDII scanner must be used to retrieve the trouble codes.
Below the dashboard, just left of the steering column.
yes it will.
If V* it is: 1,8,4,3,6,5,7,2
If your 1995 Chevy 2500 truck won't go in reverse, you got some transmission problems.
To the left of the steering wheel, below it. It is vertical, not at an angle like most plugs.
That would be the 4L80E transmission.
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Check the module under the distributor cap.
Chevy 8 lug is Chevy 8 lug
Why would you want to unhook the Electronic Spark Timing?
Could be in need of a tune up.
It will be inside the glove box to the right. You will have to remove the glove box.