Question about 2002 Jeep Liberty

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Hello, I am writing to hopefully find someone whom may be able to help me with my Jeep. I have a Jeep liberty 2003. I have had to bring it to the mechanic about 10 times since March. I originally brought it in because when I try to accelerate on a highway or after driving it a while I noticed it was not accelerating and actually becoming hard to stop. I brought it in first in March and got all 4 tires replaced and My brakes were all replaced. Then I stalled out on the highway again after that in April and thought from the smell it may have been transmission brought it in to mechanic and they said transmission was ok but found out my AC failed (I did have AC on when car stalled out) I got a brand new AC put in and new fans. It worked for a while and then again a few weeks ago on my way to work started having trouble accelerating again and trouble braking the car. No Engine Check or lights came on this time but definately could smell something again. So I had it towed to a mechanic near my work so they could look at it while I was working. They were able to drive it around and could not mimic what was happening. I took it from there and on my way home the same thing happened. We brought it to the Jeep Dealer. It seems when the car cools down it works its not till its been on the road a while or after trying to accelerate on a highway or hill. Jeep ran the car through their computers and found nothing wrong and they as well drove it around and told us the same thing. Saturday it Happened again at a friends house whos husband knows a bit about cars and he said it smelt like a burnt clutch which he said is weird because its an automatic. He called a friend down the street who works on transmissions to see what he thinks and after looking at and driving it around the block they told me it seems like the brakes are locking up in the front. I took it to Monro tires and brakes and they told me the Calipers were leaking and that is probably what was causing this. I paid to have those replaced and now again today I am on my way to work and the SAME thing happened again. I really want help. My Jeep only has 60,000 miles on it and I have payments left till October of this year on it.. All the money I put in to fix it so far I could of paid it off and got a new one. When I google Jeep liberty and troubles with acceleration on Highway I have come accross a lot of people having this issue and none of them have mentioned any fixes for it. Do you have any idea what it could be or what my next step at this point should be?

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I can't offer a definite fix there but I can offer some thoughts. First, Leaking calipers are extremely rare and I seriously doubt the validity of that repair.
The first thing I'd look at is the brake booster. If it has an internal leak or the check valve is bad, it can affect the way the brakes are applying. A vacuum leak can also cause the engine to stall from a lean condition. I'd also look at the vacuum supply line to make sure it is firmly attached and intact as well as having adequate vacuum present. Low vacuum can also cause the a/c to malfunction as many of the controls are vacuum operated. Other items worth looking at are the brake flex hoses to the front wheels. If internally blocked, it can cause the calipers to remain applied. I'd also have the catalytic converter checked for flow. If it is partially obstructed it can cause low engine vacuum and many other symptoms. There is an outside chance that the abs controller may also be acting up, but I don't think so. And, no...many of these items will not set a code.
As I said, this isn't a "cure" but may point you in a better direction for testing.
Good luck.

Posted on Jul 06, 2010

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