Rough Idle
JK Enthusiast
Joined: May 2009
Posts: 111
Likes: 0
From: San Diego, Ca
This is very true. I ran 20w50 in my previous vehicle (it was old) and I could always tell if a mechanic put the cheap oil in it because my oil pressure would drop and it would run rough.
JK Jedi Master
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
Regarding the dirty mass air flow sensor referenced on page two:
The 3.8 has no mass air flow sensor. The sensor in question is the intake air temperature sensor.
If the computer even needs mass air flow data, it can extrapolate it from rpm, manifold absolute pressure, and throttle position.
The 3.8 has no mass air flow sensor. The sensor in question is the intake air temperature sensor.
If the computer even needs mass air flow data, it can extrapolate it from rpm, manifold absolute pressure, and throttle position.
Last edited by ronjenx; Nov 7, 2009 at 02:03 PM.