sometimes “rumbles” or vibrates
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#4
Actually, now that mine did that to me today, it jogged my memory about this post. Mine has that same thing going on sometimes. I've got almost 67K on mine. It never does it when I'm actually going any kind of speed at all, but it will do it occasionally at red lights.
I have found out that, at least for me, it's just some kind of synergistic thing going on with the A/C. Whenever I turn off my A/C, the rumble goes IMMEDIATELY away. However, it'll go away all by itself as soon as the fan kicks into higher gear, so I don't worry much about it. Just one of those things.
So, see if this rumble is connected to your A/C unit.
I see you're in CT, so I guess I should say "See if this rumble is connected in some way to your heater." At least you'll know.
I have found out that, at least for me, it's just some kind of synergistic thing going on with the A/C. Whenever I turn off my A/C, the rumble goes IMMEDIATELY away. However, it'll go away all by itself as soon as the fan kicks into higher gear, so I don't worry much about it. Just one of those things.
So, see if this rumble is connected to your A/C unit.
I see you're in CT, so I guess I should say "See if this rumble is connected in some way to your heater." At least you'll know.
#6
vacuum leak.
Check the following list of suspects (don't ask):
The elbow on the bottom side of the intake plenum just aft of the throttle body
The elbow at the PCV valve (passenger side valve cover, aft)
The plastic tube that sneaks between the 2 items above
The 3/8" hose/elbow on the back side of the intake plenum (I didn't even know it was there until I took the plenum off). It's actuator vacuum for a valve and tees off of the PCV line.
Good Luck
Jim
Check the following list of suspects (don't ask):
The elbow on the bottom side of the intake plenum just aft of the throttle body
The elbow at the PCV valve (passenger side valve cover, aft)
The plastic tube that sneaks between the 2 items above
The 3/8" hose/elbow on the back side of the intake plenum (I didn't even know it was there until I took the plenum off). It's actuator vacuum for a valve and tees off of the PCV line.
Good Luck
Jim
#7
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#8
The slayer may very well be correct - those are good things to do anyway.
The distinctive symptom of a vacuum leak in this engine (in sadly vast experience) is that it runs OK under load, but idles badly - just like every other engine with a small vacuum leak. When stopping at a light, if it idles OK for 10 to 20 seconds and THEN starts to get crappy, it is probably vacuum. My guess is that the computer starts messing with IAC and EGR positions at 'extended' idle. The computer starts chasing it's own tail and the idle oscillates all over the place. Whatever it does, vacuum leaks really show up at that point.
Jim
p.s. if it gets worse when the outside air temp is low, that also points to vacuum.
The distinctive symptom of a vacuum leak in this engine (in sadly vast experience) is that it runs OK under load, but idles badly - just like every other engine with a small vacuum leak. When stopping at a light, if it idles OK for 10 to 20 seconds and THEN starts to get crappy, it is probably vacuum. My guess is that the computer starts messing with IAC and EGR positions at 'extended' idle. The computer starts chasing it's own tail and the idle oscillates all over the place. Whatever it does, vacuum leaks really show up at that point.
Jim
p.s. if it gets worse when the outside air temp is low, that also points to vacuum.
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