Mystery Engine Light
December 15th, 2010, 12:41 AM
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Mystery Engine Light
I have a 95 3/4 tonne Sierra w350 under it.
My engine light comes on after driving for 10-15 min or so in the city. 30 min to an hour on the highway with no noticeable difference in performance but my computer will not store a code. All It reads is code 12 (all systems normal)
Also if Im driving for more than an hour sometimes the engine light will go out on its own.
Recently tuned up right from coil, plugs, wires, and cap/rotor, air filter, oil & tranni flush and filter change.
Any Ideas?
My engine light comes on after driving for 10-15 min or so in the city. 30 min to an hour on the highway with no noticeable difference in performance but my computer will not store a code. All It reads is code 12 (all systems normal)
Also if Im driving for more than an hour sometimes the engine light will go out on its own.
Recently tuned up right from coil, plugs, wires, and cap/rotor, air filter, oil & tranni flush and filter change.
Any Ideas?
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