Get stock style spark plugs from the dealer. XJs can be picky about the plugs. It's either champion or ngk depending on your year range. The reason it makes a big deal is because with bad plugs and wire you'll get improper combustion and non efficient ones. And a lack of power. Plus a dirty exhaust system doesn't allow the gases to flow freely out after said combustion. And like this user said above me, yea also do the air filter too if you haven't done so lately. Dirty filter means less air being pulled into engine so less combustion. And seafoam for the gas tank to help clean injectors. Napa has a sale on seafoam right now for 6 and change a can.

 

Yeah, I know about the cheapo spark plugs. I was going to get champion coppers. Fuel system cleaner = Seafoam, right?

Should I just put the Seafoam in the gas tank, or some in the brake booster? How much do I put in the tank and do I need to let it idle for a certain amount of time?

 

And sea foam.is a fuel.system cleaner it helps clean out the gunk in your injectors and.that gives better fuel atomization

 

Gotcha. Should I do just a can in the gas tank? or the whole shebang? IE some in oil and vacuum line?

 

Ill let someone with more experience answer that

 

But I mean I don't think it could hurt

 

Here's how to test it:

CRUISER’S VACUUM TEST FOR EXHAUST RESTRICTION

Your vacuum gauge should come with an instruction booklet outlining the procedure. Hook the vacuum gauge up to a source on the intake manifold. Start the engine and note the vacuum reading. Usually 17 to 21 inches of vacuum. Throttle the engine up to 2,000 to 2,500 RPM for 20 seconds or so and the vacuum reading should stabilize to the same reading you got at idle. Let the throttle snap shut. The vacuum reading should shoot up about 5 inches of vacuum higher for a second and then come quickly down to the original reading. If the vacuum reading stays high and comes down slowly with jerky needle movements, you have an exhaust restriction.

 

I don't have a tach, is it an exact science or should I just guess at it?

 

Guess. Get it up off idle a fair ways and hold it like outlined.

 

Timken hubs for $70+ at ROCKAUTO.

 

https://www.cherokeeforum.com/f59/no...cklist-155216/

 

Put the seafoam right into the gas tank whe you have around a quarter of a tank left. Drive a lil then fill her up. I have a link on my signature about how to seafoam the oil and engine however for you jeep I don't know of Tere is any sludge or such that Kay break lose. I've done it to my oil and engine and it works good.

 

Seriously, do you have a sticky on life ;p

 

Can someone tell me how big the stock tranny cooler is if a jeep were to come with it? It just seems to me like i have 2 radiators or is the main radiator 2 parts? I highly doubt i have the stock tranny cooler because the part immediately in behind the grille is only a small portion smaller than the part behind it. Sorry if i'm just bein stupid, long night at work and i've never really stopped and looked at my radiator til now.

 

Thats called a 2 row radiator. Alot of radiators have a section of them that is actually used as a tranny cooler. If you have lines going to the tranny (easy to tell, look at the bottom left of the radiator, you should see two hard lines going in from the tranny), then you either have a tranny cooler of some sort. If you dont have the lines, you dont got a cooler. Or at least dont have one thats hooked up.