So previously the mdx was not getting the mpg's it used to and also it threw a code. I took it to a local guy in my small town and he adjusted the valves and reset the cpu. It ran great and the mpgs came back for about a week. All of the sudden while driving it one day I stopped to get a drink at the local circle k then went back out and started it and it wouldn't hardly start. I finally got it to start and drove it another 45 miles because I had to and it had lost power and was missing. I took it to the parts house and ran codes and it threw 12 codes and they were all about misfiring on all cylinders. I took it back to my mechanic and he's saying that 1/2 the motor is calling for more fuel than the other. he thinks the timing belt jumped a tooth or something. I did not think that was the case because the belt only has about 30k on it and the dealer did the swap. Any suggestions???

 

Check the timing. Just because the dealer did it doesnt mean its good. I've seen some people with no experiance doing stuff they should not have been allowed to do. If it started doing this all of a sudden, it does sound like a timing issue