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I checked my codes and so far nothing has come up. After the whole new clutch fiasco, I was sure it was the spark plugs because it was so bad the jeep would really stumble, even when I turned on the a/c. I changed out the cheap $0.98 Champians the dealer put in and everything seemed fine. I...

First off, I have a 04 Sport, 5 speed, 4-cylinder. Would a bad mass air flow sensor cause my Liberty to buck/jolt slightly when I accelerate in first gear? It only happens when the engine in warm and the outside air temperature is warm as well. The dealer thought it was the clutch, then after...

Hey thanks i will try that.

Whenever I go over a speed bump the front end makes a grinding noise. I am thinking it might just need to be lubed. Has anyone else had this problem? It is most noticeable when it's cold out or when I am just starting out in the morning.

The 4-way plug is easy. On mine it plugs in behind the rear passenger side stop lights. You can access the plug by removing the panel that covers the cd changer or storage net if you don't have the changer.

As a side note, here is a good website made by a Jeep owner who did actual testing to determine the best mileage. http://www.omninerd.com/2006/07/16/articles/57

Long term update Okay.... I know I am going to get a lot of "I told you so's" But I would rather have that then have someone else waste money on this product. So I tested this CA-40g stuff over two fill ups (I didn't want to go three and Ill explain why in a minute). At first it appeared...

Wow! I didn't realize a faulty battery could do all that. I'm glad to hear you fixed it.

Well I have another "Is this normal" type question. It seems when it rains, it pours. I started using my a/c today and I noticed from the sounds under the hood, that it seemed to kick on then off then on then off about every 10 seconds. Meanwhile it continued to blow cold air with no problem...

I have never heard any beep on mine. They should (at least according to my 2004) all lock at 15mph. Did you hear the beeps and then the locks started locking at a higher speed? Or is it the same speed all the time?

Well, I did a lot of driving this weekend both highway and city and I have noticed a slight improvement, maybe 0.8 -1 mpg. But this is just reading the Evic and going by the mileage I was getting before I put the CA-40 in. I am going to give it 2 more fill ups then stop using it and see what...

I didnt know about acetone increasing mileage. Has anyone actually tried it or is it another myth?

Ha ha, it will last you a long time thats for sure. I bought the 1 quart bottle for $30.00 (41 after shipping and tax). Considering I only have to use 1 ounce per fill up it should last me for approximately 35 (or 39, I did the math and i can't remember what I came up with) trips to the gas...

http://www.ca40g.com I heard about it on a radio talk show and thought I would give it a try. I have the 2.4L and according to the evic I currently get around 19-20 in the city and 23-25 on the hwy. I just put some in yesterday and I'll have to see if it delivers on its claims of better...

I used the platinums.

Well... I think I can finally put this one behind me! I changed out the sparkplugs and put the Autolites in and the thing runs like new. How in the world can one brand of spark plug make such a difference? Same heat range, same gap. It's beyond me. Let this be a lesson for everyone, STAY...

Okay thanks everyone. I just checked my pcv valve and its fine, I will change out the plugs and see if that fixes it.

What you are describing is exactly what I was trying (in so many words) to say. It does sound like a hiss and only lasts for like a second then goes away. I don't remember it ever doing it before, so I don't think that its normal.....

I think I may have to same problem, and I think its the spark plugs, vacuum leak, or something is clogged... like pcv valve. Just don't buy champion spark plugs.

I have a feeling now that its not the spark plugs, although I am going to change those anyway now that i bought autolites. I think I may have a vacuum leak somewhere. Every time I rev the engine I can hear a loud hiss of air for about a second then it stops. (I can't hear it unless I am under...