I have a 93 jeep cherokee and just today i was driving down the road and it felt like i hit something, but there was nothing in the road. now i have a nock coming from the rear end. what could b the problem?
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If the 4wd was engaged on dry pavement you would have a difficult time making a turn because the front tires would be turning at the same time. If the bump or vibration is felt when you are driving down a straight road I would agree with the ball joint or other suspension theory. I will note here that Jeep Cherokee came with two different kinds of 4wd, one version can be driven on dry roads when engaged.
You have two unrelated problems. the power loss can be from a variety of things. What you first need to do with that is have a scan done (many parts stores do that free)...then if you have codes stored, you at least have some direction to go in with that. The shaking is called death wobble and also has many causes. The most common are bad ball joints or tires that are worn sufficiently so as to not have enough foreward momentum to not react to side loading from bumps. The same tire can still generally pass inspection but is no longer useful on your vehicle (usually with around two thirty seconds of remaining tread measured at the wear bars). Any wear in any of the front end steering components or bushings can also cause wobble...sometimes it is a cumulative effect of slight wear in several places totaling an unacceptable amount of overall play. If you just had brake work or new tires installed, sometimes improper torquing of the wheels can also cause that. If you don't see anything obvious have an experienced jeep tech look at it. It can be dangerous and is nothing to ignore or wait on.
check the wires to the fuel pump if they have rubbed against something and the insulation wore through hitting bumps or rain could cause it to short and kick the relay and resets again and will start
If you can gear the fuel pump running It may be OK but if you spray carb cleaner into the throttle body and it briefly starts, change the fuel filter (on frame rail on left side near the tank). If it does not start with spray, check for spark. Most common problem is crank position sensor, but, do not change it without testing first. (fairly expensive and difficult to change). There are numerous other tests you can do listed in inexpensive manuals such as haynes. (if replacing filter gets it running do a fuel pressure test to make sure pump is still OK)
try the front differential link bushings, check them for wear, you can buy new arms with the bushing in them from the dealer its much easier then pressing out and in all 8 bushings -jeff please rate
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