A 1997 model should have the cam sensor mounted in the distributor with the plug on the side. Its held in with two screws. The older models were in the bottom of the distributor, and the distributor shaft had to be removed to take the pickup-coil out.
The job of the pickup coil was transferred to the cam sensor, then moved to the camshaft when the distributor was discontinued.
SOURCE: How do I change out a heater core on a 1997 GMC 1500 Pickup truck
you need to remove the glove box disconect the heater hoses look behind the glove box some heater boxes are two pieces and you can remove the heater half some you need to remove the whole piece if that is the case let a garage do it because they need to disconect the a/c so it needs to be evacuated and recharged if it is a two piece box just remove the bolts that hold the heater core under the dash and pull the box strait back good luck
SOURCE: Replace starter on 1992 GMC Sierra pickup truck
First thing unhook positive battery cable, unhook main cable on starter selanoid and small wire on selanoid (there may be 2 small wires) There may be a bracket on front of starter that has to be removed, and then the 2 main bolts that hold it to engine block and it should come out.
SOURCE: 1997 GMC Sierra Ignition Switch Replacement
take off the cover on the top and bottom of the steering column just behind the wheel. pop the tilt lever out simply just by grabbing it and give it a good tug. then once you have the new switch and you get in there your going to need an inverted torx socket to remove the small bolts that hold the switch to the column. do not move the gear on the new switch make sure it lines up exactly as the old one did!!!!!!!!!!!!
SOURCE: 1992 dodge 318 engine turns over, but no start. No
if truck has a ceramic ballist resistor near and connected to coil this could be problem or the crk posistion sensor could be too, i would change ballast first if you have on your truck appx cost $10
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