Grinding sound when punching the gas?

Kindy · #1 03-13-2011, 07:41 PM

Ok, this is going to be one of those "but it never happens for the mechanic" questions. In the last 5 days I have had this happen about 5 times now and I will try to explain it the best I can.

It first happened when I was turning to the left across two lanes into traffic and had to accelerate to get ahead of oncoming traffic. As I turned nothing happened, but as I was straightening out the turn and hit the gas I heard a loud, but very brief "grinding" noise and a little "jolt", almost as if something was trying to "kick in" or "un-stick" itself. At first I thought it had something to do with the fact that I was both turning AND accelerating, but then...the next two times was when I was accelerating from a dead stop after the light turned green. I was not turning, just going straight. The fourth time was when I was turning and accelerating and straightening out after the turn again and the last time, which was about 2 hours ago while running to the store, I heard and felt it again while accelerating out of a parking lot to get ahead of another car. Please bear in mind that it's not just when I normally accelerate...only when I have to punch it to get going faster.

So, long story short, it appears to only happen when I have to "punch" the gas and it only happens for a brief moment and then the truck runs for miles and miles just fine.

Any thoughts? U-joint perhaps? 4 wheel drive trying to engage without asking it to? Brakes sticking? ????

Kindy · #2 03-13-2011, 08:36 PM

Bump

joshyddog · #3 03-13-2011, 08:55 PM

Sounds bad...

rangerwheelinmike · #4 03-13-2011, 08:59 PM

you got l/s or a locker in the rear end?

Kindy · #5 03-13-2011, 09:10 PM

Quote:

Originally Posted by rangerwheelinmike

you got l/s or a locker in the rear end?

Dumb first time truck owner here...can you explain what these are?

lovemud · #6 03-13-2011, 10:13 PM

sounds to me like the trans but at the same maybe a hub. is there any shaking at the time?

rangerwheelinmike · #7 03-13-2011, 10:22 PM

could be a rear u joint to though

Robertkx250f · #8 03-13-2011, 10:25 PM

Is it a really bad grinding sound or a little pinging noise because mine does that and the manual says it is normal

Kindy · #9 03-13-2011, 10:35 PM

Quote:

Originally Posted by lovemud

sounds to me like the trans but at the same maybe a hub. is there any shaking at the time?

No, there's no shaking. It just makes a grinding noise and sort of "catches" for a brief second and then "releases" immediately. If that makes any sense. It didn't feel like a transmission problem (as in slipping gears) though. I've had a car with transmission problems before and it didn't feel anything like that, but I wasn't paying attention as to whether it was doing it right about the time it would be shifting or not so I can't be 100% sure either.

----------

Quote:

Originally Posted by rangerwheelinmike

could be a rear u joint to though

I was thinking U joint also, but not sure how to check for that.

----------

Quote:

Originally Posted by Robertkx250f

Is it a really bad grinding sound or a little pinging noise because mine does that and the manual says it is normal

It's a really bad noise. Kind of feel it under me sort of loud grind (kind of like when you can feel the beat of the bass from your stereo sort of noise). Hell, I don't even know if "grinding" is the right way to describe it, but it's the best I can come up with.

rangerwheelinmike · #10 03-13-2011, 10:52 PM

do u have l/s or rear locker?

----------

o sorry i dident see your last post loll

Kindy · #11 03-14-2011, 08:46 AM

BUMP please

----------

Ok, I researched it and now know what l/s and rear locker is, but how do I check to see which I have?

----------

From everything I'm reading in other posts now it sounds very much like it may be that I have the l/s locked (rear locker) and when running on pavement like I am it's catching the one tire and causing me to feel the "release" because the other tire is attempting to "catch up", but would that also make the grinding noise I'm hearing?

Rango88 · #12 03-14-2011, 08:49 AM

Quote:

Originally Posted by Kindy

BUMP please

----------

Ok, I researched it and now know what l/s and rear locker is, but how do I check to see which I have?

----------

From everything I'm reading in other posts now it sounds very much like it may be that I have the l/s locked (rear locker) and when running on pavement like I am it's catching the one tire and causing me to feel the "release" because the other tire is attempting to "catch up", but would that also make the grinding noise I'm hearing?

wouldnt running your VIN at your local Dealer tell you if you have a lock on it, just a suggestion, it would be good for your knowledge and to add to your signature

HazardousRanger · #13 03-14-2011, 09:03 AM

Quote:

Originally Posted by Crowd88

wouldnt running your VIN at your local Dealer tell you if you have a lock on it, just a suggestion, it would be good for your knowledge and to add to your signature

http://www.fordrangerforum.com/drive...xle-codes.html

use this to find out

Kindy · #14 03-14-2011, 09:08 AM

Quote:

Originally Posted by Crowd88

wouldnt running your VIN at your local Dealer tell you if you have a lock on it, just a suggestion, it would be good for your knowledge and to add to your signature

I did a VIN decode and under "locking differential" it states: N/A. It was a nice idea though, just didn't give me any more information.

----------

Quote:

Originally Posted by hazardousranger

http://www.fordrangerforum.com/drive...xle-codes.html

use this to find out

Hey thanks! Ok, my axel is F7 which means L/S 7.5' Capacity 2750 Ratio 4.10. Anyone want to tell me exactly what that means? Does that mean it's always locked?

HazardousRanger · #15 03-14-2011, 09:14 AM

Quote:

Originally Posted by Kindy

I did a VIN decode and under "locking differential" it states: N/A. It was a nice idea though, just didn't give me any more information.

----------

Hey thanks! Ok, my axel is F7 which means L/S 7.5' Capacity 2750 Ratio 4.10. Anyone want to tell me exactly what that means? Does that mean it's always locked?

DUDEE...it means ur truck is awesome

)))

okay 4.10 means u have the best gear provided by ford....perfect for running 33s and towing ur engien works less because of the gears....l/s does not mean its locked but yes u will always have l/s you have the 7 foot 5 inch axle..assuming cuz its a stepside (someone will need to explain that) 2750 is ur axle weight load bearing ratio....u shoulsdnt exceed ur trucks payload in the first place lol