I've been working on my 2004 Jeep Grand Cherokee Overland w/ 4.7L HO (Getting ready to sell)
FWIW: My daughter drove it for the last 2 years, I never really did. Just fixed a p/s and coolant leak. Still has a very small oil drip (Burns/Drips ~1 qt/ 2k miles), no visible smoke and VERY strong.
Getting it cleaned up, today I pulled the air box and as suspected the throttle body was pretty dirty on the outside and visible lip. I sprayed and wiped it off with Throttle Body cleaner, then opened the butterfly... Backside was covered in black. Just inside was an oily greasy mess. I sprayed and wiped several times as far in as I could reach with my fingers. THEN with the engine running hosed it down with some more TB cleaner, then about 1/3 can of the AMSOIL Power Foam intake cleaning spray. (Similar to the Sea Foam stuff, used it on my lawn mower with no problems).
Then I pulled the PVC valve, it was super gross, almost completely clogged and tons of crap in the tube. Cleaned them out also with TB spray and q-tips.
So I put everything back together. Start-up was a little rough and smoke as expected. Check Engine like blinked for 2 seconds only. Now runs rough as heck. No power at 1/2 throttle, when I floor it it stumbles. Little misfire at idle. I can get it up to 5k RPMs, but power is way down. No check engine light.
Obviously this is opposite of what I was hoping to achieve. What do you all think? Replace the PCV I cleaned? No idea how old the plugs are, at least 50k... Do you think I screwed up the TB or MAF?
FWIW: My daughter drove it for the last 2 years, I never really did. Just fixed a p/s and coolant leak. Still has a very small oil drip (Burns/Drips ~1 qt/ 2k miles), no visible smoke and VERY strong.
Getting it cleaned up, today I pulled the air box and as suspected the throttle body was pretty dirty on the outside and visible lip. I sprayed and wiped it off with Throttle Body cleaner, then opened the butterfly... Backside was covered in black. Just inside was an oily greasy mess. I sprayed and wiped several times as far in as I could reach with my fingers. THEN with the engine running hosed it down with some more TB cleaner, then about 1/3 can of the AMSOIL Power Foam intake cleaning spray. (Similar to the Sea Foam stuff, used it on my lawn mower with no problems).
Then I pulled the PVC valve, it was super gross, almost completely clogged and tons of crap in the tube. Cleaned them out also with TB spray and q-tips.
So I put everything back together. Start-up was a little rough and smoke as expected. Check Engine like blinked for 2 seconds only. Now runs rough as heck. No power at 1/2 throttle, when I floor it it stumbles. Little misfire at idle. I can get it up to 5k RPMs, but power is way down. No check engine light.
Obviously this is opposite of what I was hoping to achieve. What do you all think? Replace the PCV I cleaned? No idea how old the plugs are, at least 50k... Do you think I screwed up the TB or MAF?