Hemi Killer

iTrader: (6)

When I give the gas a little bit at part throttle, it sounds like a rattling or something coming from the driver side of the motor. At steady speed or full throttle I can't hear it. My SES light has been on 75% of the time the last month or so. I had it checked out at auto zone, it was the oxygen sensor and map sensor. First, I changed the map sensor and it was still throwing it. So, I took it back. I thought the noise was a bad O2 sensor, because of the code. So I changed it out, made no difference in the noise. But, I could tell a little bit better performance. I don't know if it's a loose rocker, knock or what. I checked the passanger side for a loose rocker, just haven't got around to doing the driver side yet. What do ya'll think it is???

99LoweredSierra

iTrader: (7)

Could it be the cat? or you have those?

Hemi Killer

iTrader: (6)

I still have them but relocated them to the passanger side to make room for the cut-outs. I made sure that the exhaust wasn't hitting anything. the closest it gets is about 1/4"-3/8" from the engine bay.

budhayes3

iTrader: (19)

Are you sure it's a rattle and not detonation? Other ideas include loose rocker, bad lifter, loose O2 sensor shield...

Hemi Killer

iTrader: (6)

Would a loose rocker be hard to hear at cruising or WOT? When it quits raining I'm gonna double check the heat sheilds and all that.

budhayes3

iTrader: (19)

I'd think so...it's possible that the sound of the engine gets louder than the rocker arm, if that's the problem. My engine has a bunch of valvetrain noise and various ticks that seem to get drowned out by the engine on the highway and under WOT.

If you have access to a scan tool or software, I'd check for knock retard first to see if you have an actual rattle or pinging.