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If you have a 4 Cylinders, Then you have a timing belt not a chain. And when the timing belt breaks the car will not run at all and if it was running, Then the car will stall and the engine will be damaged due to the pistons hitting the valves and bend them. So you may want to check it and maybe change it if the car is around 60.000 miles before its too late. Good luck
Putting a r/v cam in sometimes will help a bit. An r/v cam will not really give you more HP, but will move the torque curve of your engine to a more usable rpm range. Believe it or not, most of the gain you will see isn't from the cam but is from changing the timing chain which in a high mile engine is likely worn. Most engines benefit from advancing the cam a few degrees (they actually sell kits for doing that) when installing. As a chain wears, it actually retards cam phasing. Changing anything usually is a trade-off. Moving the rpm range of the cam will add low end response but will take away high end performance. If you do not generally run the engine up to 5,000 rpm, you may not notice that though. Changing the intake, adding headers or adding a "performance chip" all have some benefits but never really give you the "advertised" increase. As far as those chips go, they generally work up around 4-5,000 rpm's and don't add much to everyday driving (read: worthless). In reality, the most reliable way to restore lost power in a high mile engine is to do a total rebuild or find a compatible engine with lower miles. There is no "bolt on" cure for internal wear and though the Jeep engine is a tough reliable old bird, they do wear!
1994 2.2 liter 4 cylinder is a timing belt, it should be changed every 90,000 miles under moderate driving conditions, under severe driving conditions (stop and go traffic, etc.) it should be changed every 60,000 miles
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.
each gear has a mark on it from the factory that line up with a corrrsponding mark on the engine some times they are hard to find but if you look hard enough you will find them they all must line up there is no margin for error or it will not start like now good luck Lindz