mystery intermittent noise between 25 and 35 mph.
#1
mystery intermittent noise between 25 and 35 mph.
Hello all,
I've got a mystery noise that I can't figure out what it is.
Here's what I can tell you:
1. The sound seems to coming from the left (drivers side) front quadrant
2. Only happens between 25 and 35 mph.
3. The sound is most noticable at the 25 and 35 mph thresholds (accelerating and decelerating).
4. Noise sounds like a muffled "rumble strip" that lasts between less than a second and a few seconds.
5. Noise is of low enough volume, that it would drowned out by the noise of the heater fan or radio if not paying attention. Noise not immediately obvious to passengers unless pointed out to them etc.
6. The sound happens intermittently but repeatedly. It is not constant.
7. There is no vibration felt. (at least not that I can feel from the drivers seat etc)
8. Happens whether or not vehicle is accelerating or decelerating.
9. Makes noise regardless of whether I'm coasting, braking, or pressing the accelerator.
10. Makes noise regardless of whether the transmission is in gear or coasting in neutral.
11. I've looked unnderneath for anything really obvious but I'm obviously limited by my own limited experience and expertise. (a good manual is never a substitute for expertise gained by hands on experience etc (no matter how smart I think I am etc))
12. Steering/turning, and going up or down hill make no difference and have no impact to frequency or quility of the noise.
13. Noise happened before and after new tires. new tires different type than the old one. same noise etc.
Any suggestions, ideas, thoughts, advice, counseling, etc etc etc.. would be greatly appreciated.
Thanks,
Thomas
I've got a mystery noise that I can't figure out what it is.
Here's what I can tell you:
1. The sound seems to coming from the left (drivers side) front quadrant
2. Only happens between 25 and 35 mph.
3. The sound is most noticable at the 25 and 35 mph thresholds (accelerating and decelerating).
4. Noise sounds like a muffled "rumble strip" that lasts between less than a second and a few seconds.
5. Noise is of low enough volume, that it would drowned out by the noise of the heater fan or radio if not paying attention. Noise not immediately obvious to passengers unless pointed out to them etc.
6. The sound happens intermittently but repeatedly. It is not constant.
7. There is no vibration felt. (at least not that I can feel from the drivers seat etc)
8. Happens whether or not vehicle is accelerating or decelerating.
9. Makes noise regardless of whether I'm coasting, braking, or pressing the accelerator.
10. Makes noise regardless of whether the transmission is in gear or coasting in neutral.
11. I've looked unnderneath for anything really obvious but I'm obviously limited by my own limited experience and expertise. (a good manual is never a substitute for expertise gained by hands on experience etc (no matter how smart I think I am etc))
12. Steering/turning, and going up or down hill make no difference and have no impact to frequency or quility of the noise.
13. Noise happened before and after new tires. new tires different type than the old one. same noise etc.
Any suggestions, ideas, thoughts, advice, counseling, etc etc etc.. would be greatly appreciated.
Thanks,
Thomas
#3
Is it from inside the cabin or under the truck?
I'm not sure what a rumble strip sounds like, but maybe that ambient air temperature sensor inside the dash.
Its a little fan (behind those slots) next to the dimmer rheostat (for controlling the brightness of the interior lights).
You can open the access panel, and stick your finger in the fan or some other small object. Its not spinning fast so it won't hurt you.
Mine makes this annoying ticking sound..
Just a suggestion
I'm not sure what a rumble strip sounds like, but maybe that ambient air temperature sensor inside the dash.
Its a little fan (behind those slots) next to the dimmer rheostat (for controlling the brightness of the interior lights).
You can open the access panel, and stick your finger in the fan or some other small object. Its not spinning fast so it won't hurt you.
Mine makes this annoying ticking sound..
Just a suggestion
#4
a rumble strip are the ridges that they sometimes put on the side of the road, or before you get to a pay toll, to wake you up. When your tires go over them they make a noise and makes the whole car vibrate.
the noise is coming from under the truck...
how would I check the ABS sensor? just see if it's loose?
Thanks for the suggestions so far....
THX,
Thomas
the noise is coming from under the truck...
how would I check the ABS sensor? just see if it's loose?
Thanks for the suggestions so far....
THX,
Thomas
#5
anyone else have any ideas or suggestions?
a rumble strip are the ridges that they sometimes put on the side of the road, or before you get to a pay toll, to wake you up. When your tires go over them they make a noise and makes the whole car vibrate.
the noise is coming from under the truck...
how would I check the ABS sensor? just see if it's loose?
Thanks for the suggestions so far....
THX,
Thomas
the noise is coming from under the truck...
how would I check the ABS sensor? just see if it's loose?
Thanks for the suggestions so far....
THX,
Thomas
#6
#7
I don't have Secondary Air Injection / SAI....
I don't know much about how they test wheel alignment in a shop etc.
I'm really spit-balling here, but I'm picturing they put all four wheels on rollers and run the vehicle at a moderate speed to test and adjust etc.
If that's the case, I wonder if listening while standing next to the vehicle, while they're running it on the rollers, might help isolate/locate the source of the noise?
Sanity check please....
I don't know much about how they test wheel alignment in a shop etc.
I'm really spit-balling here, but I'm picturing they put all four wheels on rollers and run the vehicle at a moderate speed to test and adjust etc.
If that's the case, I wonder if listening while standing next to the vehicle, while they're running it on the rollers, might help isolate/locate the source of the noise?
Sanity check please....
#8
sanity check please
I don't have Secondary Air Injection / SAI....
I don't know much about how they test wheel alignment in a shop etc.
I'm really spit-balling here, but I'm picturing they put all four wheels on rollers and run the vehicle at a moderate speed to test and adjust etc.
If that's the case, I wonder if listening while standing next to the vehicle, while they're running it on the rollers, might help isolate/locate the source of the noise?
Sanity check please....
I don't know much about how they test wheel alignment in a shop etc.
I'm really spit-balling here, but I'm picturing they put all four wheels on rollers and run the vehicle at a moderate speed to test and adjust etc.
If that's the case, I wonder if listening while standing next to the vehicle, while they're running it on the rollers, might help isolate/locate the source of the noise?
Sanity check please....
#9
#10
The alignment process does not use rollers and does not require the vehicle to run at all. Targets are mounted to each wheel and cameras pick up these targets. The targets have precise geometric reflective shapes imprinted on them which the cameras track the position of. All of this is done on a rack after initial calibration (runout compensation and caster swing).