Rattling shaking sound

[Low]

1991, 4.0.

Rattling vibrating sound under the hood,, only in low rpms under 2000, and only in 1st and 2nd gear. I can't visibly see anything loose under the hood or below.. Any ideas?

 

[55trucker]

Sounds like somehow Bill Haley & the Comets got under the hood.

*I said, shake, rattle, and roll*




Catalytic converter heat shield?

 

[Uncle Gump]

I always check the belt tensioner and idler pulleys.

 

[Low]

Thanks for the feedback. I'll take a look at it today

 

[rhekman]

1991, 4.0.

Rattling vibrating sound under the hood,, only in low rpms under 2000, and only in 1st and 2nd gear. I can't visibly see anything loose under the hood or below.. Any ideas?

If it's only audible at low speed under load, it could still be something in the accessory drive, or you could also look for loose brackets around the motor or exhaust that contact when the engine twists on the mounts.

If it's the same quality of sound every time, you can search for it while parked by using a long screwdriver or metal rod as a stethoscope to your ear while touching various parts around the engine. Be VERY careful of spinning belts & pulleys, don't wear loose clothing, and be safe. But you'd be surprised how quickly you can narrow down where unusual sounds are coming from.

 

[Low]

Really appreciate the feed back guys, ill try the stethoscope method this morning before work