Being proactive?????

Happy Friday everyone!!!!!!:sunglasse I just want to say that this forum rocks and I visit once a day. My question is this the parts and sensors that wear out should I replace those before they fail especially the hard to get at ones. What would you suggest i have a 99xj 4.0

Only two problems with that line of thinking. If you replace a sensor that's still working what happens if the "new" one from the parts store is bad and have to swap them back out again taking alot of time that's not needed. Second is purely the cost of the sensors. Best thing that I would do if I had the money to get new sensors is I would buy the sensors and put the receipts with them and then hang on to them until one of the sensors actually does give out so if you don't have the money right then to buy a new one it won't matter as you'll already have it.

I agree.. Having spares is a very good idea, but not the most practical approach. Doing regular maintenance like fluid changes and tune ups is quite important of course. I say keep a spare of the CPS at all times. You never know when that gremlin will strike. And clean your NSS. The usual suspects.. etc, etc...

The one sensor I would replace is the CPS (although mine is original). The later the model Jeep, the more reliable the engine electronics is going to be.

The Nss should be cleaned when needed.

I keep a brand new spare serpentine belt on hand though.

Change the radiator cap, $7, and the gas cap, $12.

We have parts stores all over the place here in California, so I don't need to keep spares for an XJ. Jeep parts are easy to get. My other vehicles though, I order online from dealers.

Be proactive in keeping your engine internal parts clean of oil gunk that builds up over time. you'll save yourself alot of headaches down the road.
www.auto-rx.com

Consider replacing the oxygen sensor every 50k miles or so.
IMO all the other sensors can be left until they fail although the CPS does seem to be a bit temperamental.

Thanks for the input I agree that regular tuneups and fluids will help keep it on the road and I know that cps is kinda a pain to change so might look into just that sensor for now..funny thing I have only rolled down my windows a handfull of times or less because of the postings on the window regulators going bad but since its winter now no big deal keeping the windows up :screwy:

FWIW, I just changed my CPS and fuel pump at 166k on my '95. The fuel pump wouldn't hold pressure for even a few minutes after shutdown (now it holds pressure like a champ), and the CPS was getting flakey.

I had the classic symptoms, and just bit the bullet and fixed them both at once. Beats walking.

I'm not a big fan of throwing money at parts that "might be going bad", but I was well on the edges of life expectancy for those items. I carry a spare serp. belt, and assorted fluids all the time.