Ok, when my dad bought this 98 dakota sport club cab, it had a wierd
rattle at about 2,000 rpms. The noise got a lot worse ( well, we
thought it was the same noise) and it started to rattle ALL the friggin
time, it was horrible. After a few months, yesterday, the check engine
light came on. So my dad took our truck to a shop who replaced the CAT
convertor (for $80 because the mech. said it was a knock off brand and
it wont pass smog, compared to the $250 CAT that will pass smog) and
the loud rattling noise is gone! But......... that same rattling noise
that was there when we got it, still rattles around 2,000 rpms. It isnt
that bad, but I am guessing it might be the exaust manifold. Oh, and
about that check engine light, after the mech. replaced the CAT he told
my dad that the CAT wasnt the cause of the light. He said it was some
code P0422, and he just suggested putting the gas cap on tighter.
Does anyone else have that little bugging rattling noise?
And is it an easy fix?
And is there really such a thing as a cheap "knock off" brand of CAT's?