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i just bought a 1993 jeep grand cherokee limited with 172k for my wife to drive. she likes it a lot, but i want to make sure she's not going to get stranded.

first, i'm am going to be getting a new fuel pump soon because the pressure bleeds off after about

30 minutes, and takes a bit of key cycling and cranking to get it to start again. :/

i cleaned the throttle body and idle air control as best i could with some carb cleaner, because i thought it might take care of some stumbling at idle, but not while cruising. it seemed to work for a while, but after about an hour of driving, it stumbles about 30 seconds after you return to idle. crank position sensor? throttle position sensor? plugs, wires, cap, rotor look new, 7.6kV on all wires at idle when it's not missing.

finally, she doesn't like to downshift at cruising speed. say i'm going 55 and i want to pass someone, step on the gas, expecting a downshift and subsequent burst in speed, however, stumble stumble stumble, i might as well not have stepped on the gas, total loss of power, and no downshift???

did i screw myself with this purchase?

this is my first experience with a fulltime 4wd. is some scuffing and binding to be expected during parking maneuvers or do i have a problem?

perhaps

Reply to
MudPuppy76
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MudPuppy76 proclaimed:

Have the crankshaft position sensor checked. You probably also want to have the catalyst checked for plugging and the 02 sensor as well.

No, but this vehicle needs someone very familiar with jeeps to check it out. Which *should* have been done before you bought it as there are plenty of cherry Grand Cherokees out there. However, if you are unfamiliar with the machine, get help. Plus you may want to buy the Factory Service Manual, available online at

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It depends. If your Grand has the 4Hi and 4Lo positions for the transfer case, you have a problem if you are getting scuffing and binding. That transfer case does not have a 2 wheel drive option and is designed to allow some slippage. Some models have limited slip which is easy to mess up by simply adding the wrong fluids.

On the other hand, if your transfer case has a 2 wheel Hi and a 4 wheel high, simply shift it into 2 wheel high where it belongs for all but very slippery conditions.

Reply to
Lon

MudPuppy76 did pass the time by typing:

I set the followup to rec.autos.makers.jeep+willys. Multiple groups arn't necissary.

best (and cheapest) guess, plugged fuel filter.

Just remember to releve pressure on the fuel system and wear goggles to avoid taking a shower. A little oil on the filter ends helps them seal. (takes some time or a couple of small screwdrivers to remove the clips from the old fuel filter, don't break them, they are hard to get.)

Fuel filter. And possibly the kickdown linkage, but with the stumble you should do the filter first. If the engine bogs the ECU/TCU will hold gear.

the I6 will feel rough if the motor mounts are shot and need replacing. see if they look like these did.

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is far cheaper to do it yourself. The dealer isa pure ripoff on this repair. Your engine might also have a lot of carbon buildup either do a seafoam (NAPA) yourself or find a shop that uses a system called "motorvac", should run about $100 and will clean everything from the injectors to and including the cat (if it's not plugged)

And speaking of... that's also a possiblity for loss of power on acceleration. Easier to tell if you have a vac gauge to look at.

Reply to
DougW

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