First off, I just signed up here, but I use this site all the time, and have used lots of info, so thank you all. Now on to my problem. I have a 2006 Nissan Titan SE KC 4x4 and I am hearing a grinding/whirring sound with vibration in the floor boards and gas pedal. It happens at low speeds (5-35 mph) about every 15-60 seconds, and it lasts for about 5-10 seconds. When I am completely stopped, but in Drive, the gear shifter and console vibrate a lot for 5-10 seconds. I took it to a shop, and they replaced the front driveshaft U-joint and pinion seal. This did nothing. I took it back to the shop and they told me to keep driving it until it gets worse. It doesn't seem to be getting worse. I have a slight loss of power, and I am getting poor MPG's. And I mean poor for a Titan, 9-10 mpg, mostly city driving. The noise goes away if I put the truck in neutral. I do need a new exhaust, the muffler and tips rusted and fell off. I dont think this would cause the grinding, maybe the vibration though. The grinding/whirring is guaranteed to happen after I go over a speed hump. Not a speed bump or a pothole, a speed hump (like a wider speed bump, in case those are just a Maryland thing). Best guess I have would be a bearing or the front diff, but I'm not a mechanic. The sound does not get worse when turning, and it seems to be coming more from the driver's side. The grinding/whirring sound almost sounds like an old airplane flying overhead, with a more metallic sound to it. The vibration in the floor boards feels like I'm driving over rumblestrips at a high rate of speed. Also, this may be unrelated, but I pressed on my E-Brake pedal today and it barely did anything. Literally I would still drift forward, on a flat surface, without even hitting the gas. Thank you for reading, and thanks in advance for any and all input.
stsvt07
Check your emergency brake shoes cause they will come unglued and drag in the drum. IJS
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Never had a starter problem thank goodness and knock on wood,but I think that if it was that you would hear some kind of hellish noise upon startup.
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If the noise goes away in neutral, there is something duffed downstream of the flex plate or flywheel.
Check the exhaust... depending on the mileage and hearing how bad the rest of your exhaust has been, I would check the catalytic converter; could be pluged. Are there any dash lights on? A differential or universals shouldn't make any noise when the truck is stopped... these are mechanic components that rotate and spin with the truck. The drive shaft spins the axles so it won't spin when the truck isn't moving. Same goes for the E-brake ... brakes won't grind or make noise when the truck is stopped and moving from park or drive has no bearing when the truck isn't moving. However, moving it from neutral or drive could make a difference on idle RPM... the rpms will drop in drive as compared to park or neutral. The higher RPM could have influence on the noise which could be coming from a bad catalytic converter. This would normally affect idle a bit and it should throw a code for O2 sensors. If there are no dash lights on... you got problems. This would more so indicate a transmission problem. I say the trans because of the differences you hear between neutral and drive and the tran's behavior is different in each gear. The fact that you hear it consistently could indicate trans as well as it could be a noise based on rotation. Sorry bro!
Thanks for the input. Just to give an update, I raised the idle using my BDGT, and this stopped the vibration at idle. I then replaced the exhaust with a Magnaflow 17110. I can now leave the idle in it's stock position, and the vibration/whirring is barely audible. However, I can still feel a vibration in the gas pedal and floorboards when driving, especially after going over potholes, bumps, speed humps, etc. Also, just to clarify, the noise and vibration does not happen constantly, it is only on occasion, even when idling. The slight vibration still continues when I put the truck in neutral, but it is extremely faint. I am thinking the vibration in the gas pedal is either an engine or transmission mount, a bad bearing, or possibly (but hopefully not) the front differential. I believe the vibration at idle is just a loose heat shield. Another thing to add, the truck drives the same in 4x4 as it does in 2wd, there is no grinding of any kind. Although, the 4x4 indicator light blinks for about 10 seconds, after it is taken out of 4wd. This may be normal, but I don't recall it ever taking that long. Hopefully I can figure this out, and as always, any input you all can add is greatly appreciated.
By the way, I'm sure you may be wondering why I don't just bring it to a repair shop. Well, I have. The problem is that it's one of those things that I can feel and hear, and I know something is wrong, but it's not loud enough for a mechanic to think of it as out of the ordinary. So, I'm hoping if I can get some ideas as to what it is, I can just tell my mechanic to check that specific part, and see if it is that. Also, I have an aftermarket warranty, so I want to get this fixed before the warranty expires.
Thanks.
By the way, I'm sure you may be wondering why I don't just bring it to a repair shop. Well, I have. The problem is that it's one of those things that I can feel and hear, and I know something is wrong, but it's not loud enough for a mechanic to think of it as out of the ordinary. So, I'm hoping if I can get some ideas as to what it is, I can just tell my mechanic to check that specific part, and see if it is that. Also, I have an aftermarket warranty, so I want to get this fixed before the warranty expires.
Thanks.
My truck had the same "grinding thing" at certains speed like you all said... The problem is called -VIBRATION- this happens when you're running you're car, not when is in parking, so this "grinding thing is the laminate cover that protects you're catalyc converter that vibrates, you just need to get a long screwdriver or what ever is better for you and move the laminate just a little bit far from you're catalyc converter and that's it you're done, if you have two, check the two of them ???
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