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easyest way to check timming.pull #1 spark plug.#2 pull dist. cap. turn engine over manuely if possible look in spark plug hole see if piston is at TDC.top dead center.then look where rotor button is at. should be at #1 spark plug wire connection if not chain or dist.gear has slipped.
That depends on which engine you have. Both 4.0 and V8 engines have a chain. The chain has no real time limit on how long it's good but from experience I've found that most, when well maintained will stretch to the point that they should be replaced at around 225 thousand miles. Chain and gears are not super expensive and if you buy the best ones you can find, if you replace yours at 225-250 thousand miles the new one should outlast the vehicle.
I BELIEVE THAT IT HAS A TIMING CHAIN. IT SHOULD BE CHANGED AT OR ABOUT 100,000 MILE. BUT IT DOESN'T NECESSARILY NEED TO BE CHANGED THEN, JUST INSPECTED.
Depending upon which engine you have and how hard you run it and how often it's serviced (and what kind of oil you use) Most chains will go about 160-180 thousand miles before they stretch enough to put the valve timing out of phase enough to be very noticeable. I don't remember if Jeep ever used a nylon toothed cam gear except for the older ones with GM v6 engines. If you don't have a nylon gear, I have never seen a chain actually break, usually after it stretches, it rides up on the gear teeth and shears them off. That won't happen with a steel gear.(Check with dealer parts dept...they should know what is in there) Therefore, it's likely that either way you have about twenty thousand miles left before you need to worry much about it.
You will not need to change a timing chain unless you know or suspect it to be bad. Belts and other material that wear down need to be changed but the timing chain itself is a metal similar to that of a bike chain but much shorter and thicker
Thundergod is correct, whoever put the timing chain on did not have the cam and crank in time. With the timing cover off, you need to make sure the mark on the crank is at 12oclock, and the mark on the cam gear is at 6oclock. Then install the timing chain. This will fix the problem. Good luck.
Check for a clogged catalytic conveter or weak fuel pump. Remove the O2 sensor so exhaust can flow out hole and test drive it. If it's better replace the cat or look for kinked or dented section of the exhaust. If it didn't help, have the fuel pressure tested as well as the ignition advance and timing chain.
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