Rattling sound up front?

[Pork Soda]

I've been noticing this the last 10 days or so, since the weather has turned nasty.
It's a 2-3 second burst like a jack hammer from somewhere under the hood or in the front drive/ brake area. Notice it within 1-2 minutes after I get moving, but only at a stop. Makes no difference how much it has warmed up. I haven't noticed anything else, just wondering about the noise. Thanks

 

[beantown]

My LC was making a similar sound, mainly on dirt roads. I checked the front bumper, where it meets the quarter panel. I tightened up the one bolt the connects the two and no more rattle. Just thought you might want to rule that out first.

Cheers.

 

[NMuzj100]

Could it be the brake booster. They make noise but not usually jackhammer loud. They also run an ABS test cycle or similar after the truck reaches a certain speed for the first time on a start.

Are you saying 1-2 mins after you start moving. Warm or cold. Or are you saying at every stop.

 

[drmwvr]

I've been noticing this the last 10 days or so, since the weather has turned nasty.
It's a 2-3 second burst like a jack hammer from somewhere under the hood or in the front drive/ brake area. Notice it within 1-2 minutes after I get moving, but only at a stop. Makes no difference how much it has warmed up. I haven't noticed anything else, just wondering about the noise. Thanks

This was happening on my '99 and it turned out to be the plastic engine cover was vibrating. I researched and found a thread on this that recomended that I take it off. I did and have not heard the sound since.

 

[bamachem]

I've also heard Charcoal Canisters "chatter" like what you're describing.

 

[Pork Soda]

Could it be the brake booster. They make noise but not usually jackhammer loud. They also run an ABS test cycle or similar after the truck reaches a certain speed for the first time on a start.

Are you saying 1-2 mins after you start moving. Warm or cold. Or are you saying at every stop.

Not jackhammer volume, but that type of short burst. Tends to happen once after I start rolling. Usually at the stop light down the street. Usually doesn't happen again the rest of the day. Maybe once later in the morning.

Now that i am thinking about it, seems to be only when I come to a hard/full stop due to traffic at the intersection. Could be the ABS test. I have only noticed it when radio is off, so the volume isn't that loud and vibration isn't noticeable.

 

[Pork Soda]

I've also heard Charcoal Canisters "chatter" like what you're describing.

"Chatter" is the perfect description. Is it a sign of trouble with the charcoal cannister?

 

[Pork Soda]

I Will def. check that out. Be great if it was the easy solution. the engine cover, that is.

 

[tnlandcruiser]

Exact same thing here. Jackhammer is a perfect description. Mine happens in the same situation. While checking my oil the other day, I accidentally banged the veal out of the engine cover. Same sound. I'm guessing that's it.

 

[4btfjz80CO93]

Not jackhammer volume, but that type of short burst. Tends to happen once after I start rolling. Usually at the stop light down the street. Usually doesn't happen again the rest of the day. Maybe once later in the morning.

Now that i am thinking about it, seems to be only when I come to a hard/full stop due to traffic at the intersection. Could be the ABS test. I have only noticed it when radio is off, so the volume isn't that loud and vibration isn't noticeable.

Hey,

I have intermittently experienced the same sound with mine. Generally when it is colder, and most often occurring when I stop. What did you figure out with yours?

 

[collk22]

Bumping this thread as it describes what I've been experiencing the last couple of weeks, but I've noticed the "chatter" / jack-hammer burst of noise intermittently while driving at low speeds or coming to a stop. The other day I noticed that it persisted briefly after I stopped the car and I got out to listen to it - appears to be coming from the drivers side.

How do I diagnose if it's the ABS Self-test?

If it's the charcoal canister how do I resolve?

 

[nmatcek]

Check the easy stuff first. I had a clatter that turned out to be a missing bolt on the side flange of the metal under-skid.