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Re: trying to time 2001 gmc jimmy 4.3
Ground coil or remove plug wife away from number one spark plug. Place finger in fron of spark plug hole while some bumps the starter. When the air for the copression pushes finger off hole stop started . Align the timing marks,or insure that they are close. Place distribiator back into hole with the cap off pointing to where the wire for number one plug is going to go. bolt down dist. and replace cap.
Your timing wil be now close enough to start or if not rotate it slightly and try again.
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Remove number, one spark plug , turn engine over till compression is felt, turn engine over till TDC marks on crank pulley and timing cover marks line up, fit distributor to motor with rotor pointing to number one distributor cap tower, start and set final timing with timing light.
There will be one in each exhaust manifold or in the exhaust pipes right after the manifolds. these are referred to as the upstream sensors or "sensor 1". there is one after the catalytic converter. This is referred to as the downstream or "sensor 2"
Loosen the bolt at the base of the distributer on the passenger's side. If you don't have a timing light, mark the dist and intake manifold so you can put it back exactly where it was in the event of a problem. Turn the dist counter-clockwise just a tiny bit and the idle should raise a little.
You said the problem happened right after the engine was replaced correct? If so bring number cylinder to top dead center on the compression stroke. Remove the distributor cap and see if the rotor is lined up with the number one spark plug wire. It's possible the distributor was installed 180 degrees out.
My GMC Jimmy '01 would slip from 2-wheel to 4-wheel drive while I was driving. First time it happened my mechanic replaced a small part. This last time, he couldn't find anything wrong so he popped the 2-4 out and disconnected the 4-wheel drive. Now I don't have the problem.
Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.