As a tech I will give you my opinion. First get those plugs out of the engine. I have had more cars come into the shop with running problems due to the Bosch plugs. How did you use the seafoam? Did it go into the gas tank or did you run it through the intake? Gas mileage is a subjective thing. It depends as much on the condition of the vehicle as how you drive. If it came into my shop with no codes and running fine I would start with an induction service. I am not a fan of Seafoam. I use the AcDelco X-66A carb and tune up spray. I run it through the brake booster hose. It does a much better job cleaning the intake and valves than the Seafoam. Usually if the O2 was suspect you would have some kind of code. The computer is pretty quick about picking up on that. It would still be nice to hook it to a scan tool and see what is going on.

 

naw my check engine light doesn't come on, and might i add i think i may have a leaking head gasket becuase when i first received my jeep from my grandpa who passed i looked and everything was covered in grease/grim/oil something idk but i blasted it off all. Also might i add my idle is rough and the rpm needle moves up and down rapidly like a cm almost not noticeable

" when you said leaking head gasket i was thinking of my valve cover for some reason which also leaks idk why it has so many minor problems is a 2000 with 144,116 mile AHH!!!"

 

i have always ran seafoam through the vacuum like w/e you wanna call it, and once in the tank

 

my book says i have a 20 gallon

 

 

Well, the vehicle is 10 years old. Gaskets go bad over time because they deteriorate. Valve cover gaskets are an easy fix to DIY. Your air filter isn't too dirty, but I would replace it if this was my Jeep. They're cheap (if you go with OEM spec filters). I've got a 2000 Cherokee too and I've replaced the head gasket, upper radiator hose, all four shocks, air filter, front axle u-joints, front hub assemblies. I've replaced transmission and transfer case fluid as well as serviced both differentials and I'm going to replace a downstream O2 sensor. My to do list before I can upgrade is track down my emissions leak, replace brakes all around and replace the window washer solvent resevior. I'm in the same boat you are - a bunch of little things going wrong that need attention.

 

sucking hmmm well engine bay is pretty loud and i wouldn't know what im listening for because i haven't heard a blown gasket sound

Hmmmmmm i found this product proven to work

http://www.autozone.com/autozone/acc...er=908985_0_0_

video that i watched that kind of convinced me

 

You won't hear a blown head gasket. The tell tale signs are water in the crank case oil turning it white or grey and excess pressure in the cooling system. You also may see steam from the tail pipe.

 

If you use a sealant like that you run the risk of plugging up the lines to the heater core, and the heater core itself. That is a pricey, long, frustrating job replacing a heater core. Use at your own risk.

 

try techron or gumout with regain fuel injector cleaner and of course check air filter

 

Sorry after seeing pictures of air filter change it to a fram but buy puralator oil filters or anything other than fram

 

Just what I was going to suggest... the mechanic that replaced both of mine, took her for a spin after replacing them and mileage when up to near 39 mpg... best I've ever had.

 

Really 39 MPG Wow

 

39 mpg? That's a little stretch, I think.....

 

39 mpg? dont think so