98 Jeep Wrangler 4.0- So, I started out to replace the coupler gasket on the exhaust and found out that the exhaust manifold was cracked up pretty bad and had some very bad welds from the previouse owners fix to it. After pulling the intake I noticed that the #6 port was almost clean, absolutly no carbon, but all of the others were pretty well caked. Would this be a bad valve, broken rocker, dead injector ie... clogged or electrical issue? Or am I just LLMF?
Intake
Aug 24, 2006
1 Replies
#6 is the hottest running cyl. Furthest from the air and coolant and usually is clean. Carbon in the exhaust header and ports is fairly normal. Usually the result of an old O2 sensor that's causing the engine to run rich. A broken rocker you would hear from inside. :)
Time to get a drop-in. I went with Banks but it required a bit of grinding to clearance the motor mount.
formatting link
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required