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radiator should be drained but if you can't find petcock remove lower hose at the radiator. There is a bracket on top with around 5 to 8 screws. Then lift off bracket. Take the upper hose loose at the radiator to let the rest of the coolant out. the overflow reservoir has a small clamp to remove as well. If this is an automatic with coolant lines take them off from the bottom. Sometimes they are rusty so do small part turns to break loose. You don 't want to replace these because they are hard to get at. A catch bin of 2 gallons should be enough to catch the coolant. It is poison but dogs and cats like the sweet taste. During reassembly keep in mind that there are rubber mounts on most of these usually 4 used as a shock mount.
Thanks for choosing FixYa. You may have an issue with your motor mounts or the suspension on your Jimmy, thus causing the engine to rattle. If it is only doing this during acceleration, it could be a few different things. Since you have 116,000 miles, you are in need of a tune up, if you haven't already. You may need to change your fuel filter or injectors. If the engine is not getting enough gas to the engine, it can cause the engine to miss, causing noises. You will need to check the fuel pressure to determine that though. As far as the tune up, you may need new spark plugs/coils, and wires. There may be internal engine damage but I think it is something simple. If your check engine light is on, you could take it to Autozone and have it scanned. They do it for free and they can tell you why the light is on. This is the best path because you are not guessing what it is. If no light is on, and you haven't changed any of these parts, I would start there. If you have any other questions, just let me know. Thanks for using FixYa and have a great day.
The machine it talking about code P1345 CKP/CMP sensor correlition Do the engines RPMS fluctuate at idle or if you try to hold it at a steady speed if so then check the connection at the CKP make sure it is getting voltage its installed correctly and so on. If no problems are found then you need to check the distributor shaft remove the cap and see if the rotor turns on the dist shaft if it dose then thats the problem and eigther must be replaced or rebuilt thats the distributor it self
THERE IS A WIRE THAT NEEDS TO BE DISCONNECTED UNDER THE DASH ON PASSENGER SIDE JUST BELOW HEATER BEHIND CARPET ON FIRE WALL, SINGLE WIRE WITH PLASTIC DISCONNECT. DISCONNECT WIRE WHILE SETTING TIMEING,RECONNECT AFTER TIMMING SET.
On your engine, you will need to removed the first spark plug on the drivers side of the engine. (if you are looking at the engine from the front, it will be your right side) Next, have someone "bump" the key as if you were trying to start the engine while holding your finger over the spark plug hole. When air is forced out of the spark plug hole, stop and check the crank shaft balancer for a small groove. It should be lined up the the make on the front of the engine. That will have you a tdc and you always use the number one cylinder to set the timing on you truck. If you need more assistance let me know.