I recently purchased a 2007 H3 with 217k miles, the dealer said it sat for a year before I purchased it. So far I have changed spark plugs and oil. I'm considering flushing all fluids, transmission, fuel system and engine flush. There was oil on the threads of my plugs. Am I going overboard? I'm looking for recommendations on what I should do to get her back to peak performance. Thank you for any advice.

 

It isn't throwing any codes other than usual O2 sensors and of course service TPM lol

 

Since you do not know its service history, it is a good idea to drain and refill Engine oil with new filter, Transmission with new filter, T Case, front and rear diffs and possibly brake fluid. I would just fill up the tank with new quality top tier gas and let that work its way through.

 

"No codes... other than usual O2 sensors"?
My '07 O2's are still original/factory installed, STILL NO CODES!

 

Thanks that's what I was figuring would be best.

 

The O2 sensor code is saying the same thing as the code my Maserati threw. It ended up being a wire that came lose and I was easily able to solder it back no replacement needed. I am at work and have my notes at home with the exact code, but I'm hoping when I get in there and look it will be an easy fix like the mazi was. Lol I've only owned the H3 about a month now and I already love it very much. I can't wait to get her completely sorted so I can start my customizations. Lol ❤️ hope everyone has a great day! I appreciate the help.

 

That H3 was parked in the back lot for a reason...
Check the compression, check for head gasket issues, etc.

 

This, since plugs are going to be out might as well and easy to do. Fuse box has a fuse for fuel pump, I disconnect mine when I did the test. There's also a block tester they sell that detects exhaust gas in coolant.

 

Yea I figured that would need to be checked also. Just wanted to be sure I wasn't going overboard with it. Thanks so much!!

 

Sounds like you pretty much got it covered. If sun roof clear drain tube. Make sure your battery posts are clean and tight. Check air filter.