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Ken S
Dodge Dakota
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11/02/2006
00:14:29
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 Subject: Grinding while accelerating
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While I'm accelerating from a stop I hear a grinding noise from the front under the cab. Or at least that's where it sounds like it's coming from. It also does it alot on the highway going up hill when the engine is under a little strain and trying to pick up speed. It also does it traveling on roads at 45mph up hills and even sometimes just driving along. It's like a grinding ping pang noise. It's hard to describe without hearing it. Has anyone had this sound. Could it be something with the driveshaft or gearing somewhere, or ball bearings? Any help would be great.
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Kowalski
GenIII
11/02/2006
07:40:47
|  RE: Grinding while accelerating
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Tell us more about your truck. AWD ?
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Hudson
Dodge Dakota
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11/02/2006
09:15:43
| RE: Grinding while accelerating
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Mostly while under load. Could be pinging? Try higher octane gas
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Ken S
Dodge Dakota
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11/02/2006
11:09:35
| RE: Grinding while accelerating
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Sorry, I meant to leave some info on my truck.
99, CC, 4x4, 69K miles
What is pinging? I'm not sure it is that though because I can feel it under my feet on the floor when it gets really bad. And it doesn't do it as bad when it's colder weather like from 50-70 degrees outside. So I think it's more to deal with gears or bearings. But I'm no expert on cars, thats just from my experience.
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Josh
Dodge Dakota
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11/02/2006
12:16:33
| RE: Grinding while accelerating
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You haven't said yet what engine you have.
Here's some sites with info on pinging/knocking/pre-ignition/detonation (whatever you prefer to call it). Even if this isn't your problem, it's something you should know.
http://en.wikipedia.org/wiki/Engine_knocking
http://www.answers.com/topic/engine-knocking
http://www.type2.com/library/engineg/ping.htm
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Ken S
Dodge Dakota
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11/02/2006
12:47:08
|  RE: Grinding while accelerating
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yeah, sorry I still didn't provide enough info. I'm writing these posts while I'm at work, so I'm distracted as well.
V6 3.9L
Thanks for the links Josh.
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mikesz
*GenIII*
11/02/2006
12:49:26
| RE: Grinding while accelerating
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Ken S
I have very similar problem.You will find my post near by Yours-"irritating engine sound"Definitelly it is not a fuel.Our gas in Europe has even higher octane rate then Yours.Even using 98'doesn't help.Found lately that it happens only on "drive",so I'm affraid it might be tranny problem
mikesz
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Kowalski
GenIII
11/02/2006
13:57:28
| RE: Grinding while accelerating
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Pinging doesn't make a gringing noise. Might want to check fluid level and condition in front differential and transfer case. I'd check CV joints too.
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Ken S
Dodge Dakota
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11/02/2006
14:41:47
|  RE: Grinding while accelerating
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Yeah, I'm going to agree with mikesz, mine only makes the noise in drive driving down the road.
Ok, Kowalski, if I check the front differential wouldn't that be the gearing for the front tires? this maybe a stupid question. I'm not knowledgable in this area. Or are you talking about the section right behind the transmission? thanks for the help. I've been driving around today, and I'm not hearing it, so it's just when it's really warm outside. It's maybe in the mid 70s here in Georgia.
And wouldn't the CV joints only make a noise when you turn, or make it ALL the time, not just when accelerating?
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Kowalski
GenIII
11/02/2006
16:39:16
| RE: Grinding while accelerating
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Yup, that's the gearing for the front end; many might not realize its in motion anytime our trucks are moving - no disconnect. Your questions aren't stupid at all - the more we know about what you know, the more we can help. The section behind the transmission would be the transfer case. Could be transmission too. CV joints could be noisy all the time, or just when stressed when they're starting to go. It could be lots of things - brake related, or wheel bearings - likely something to do with the drive train if it only does it while driving. Also possible something in the front of the motor is contacting when motor moves a bit under load; particularly if there is a problem with one of the motor mounts. Lots of stuff worth checking...
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Ken S
Dodge Dakota
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11/02/2006
23:53:56
| RE: Grinding while accelerating
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Thanks a lot Kowalski, I will look into all those possible problems. I was driving around more and I did hear it, but it's just not loud during colder weather. I'm thinking it's more with the transfer case b/c I can feel it when it gets really bad. It's right under my feet.
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little jer
Dodge Dakota
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11/03/2006
01:20:11
| RE: Grinding while accelerating
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hmmm, if it was something like the transfer case or tranny, it would be all the time, not just at certain temperatures. Same with motor mounts. Though a broken mount may allow the fan to hit something, like radiator, on acceration because the torque raises it up, but it would do it at all temps. However, some type of bearing may make noise when warmer because the oil would be thinner when hot. Time to take it to the dealer because it could be anything. Could even be Kowalski's plow hanging up on your undercarriage.
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Kowalski
GenIII
11/03/2006
08:29:55
|  one good slam deserves another
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So, little one - you don't think transfer case fluid thins out when it heats up too ? Do you realize the post of this thread insinuated this happened more under load, rather than when warm as was just explained after I made the earlier posts ? I'm sure Ken will find your advice to "take it to the dealer" or "could be Kowalski's plow" most inciteful...
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Ken S
Dodge Dakota
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11/03/2006
11:52:30
| RE: Grinding while accelerating
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Thanks Kowalski, but it may be a fan issue. Since it's not as loud in colder weather it may be a bearing on something. But it could be something with the transfer case. Is there some kind of bearing in the TC? And how much would it cost in labor if it's something to do with the TC?
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daddio
Dodge Dakota
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11/03/2006
12:30:33
| RE: Grinding while accelerating
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could the fan clutch have anything to do with that?
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Kowalski
GenIII
11/03/2006
12:55:41
| RE: Grinding while accelerating
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Ken - didn't mean to keep emphasizing the transfer case for you; just wanted little jer to think a bit. Could easily have something to do with the fan. Getting any better idea of just where the sound is coming from ? Problems like this are difficult to trouble shoot behind a computer, maybe take a friend with a bit more mechanical experience for a ride while its making noise ?
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mikesz
*GenIII*
11/03/2006
15:11:51
| RE: Grinding while accelerating
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I do not think that temperature is a real issue.All the rotating parts in the engine and close to it,work after let's say 15 minutes in temps much higher than outside temperature even on Nevada desert.I think ,I have the same problem as Ken S and during last Year sometimes thought ,it happens at low temp.,sometimes at high temp,but one thing is for sure!Always during acceleration!.Have tried many times on "P" or "N".Never appears!First of all,the sound has a very high frequency,so it shouldn't come from halfshafts or wheel bearing.It also sounds not as direct sound, but like resonance...If You know what I mean?
mikesz
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Ken S
Dodge Dakota
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11/03/2006
16:13:43
| RE: Grinding while accelerating
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Yeah, having someone ride with me is about the best way for someone to find out where it's coming from.
Yeah, I've noticed that it still makes the noise in the cold, but it's just not as loud. During the summer when I rode up a hill one time on the interstate going about 65-67, I had the cruise on and it was giving it a little more gas to get up the hill. it wasn't really steep, it was just long and on a turn. The best way I can describe it is that it starts out like a grinding noise(kinda resonating at first), but then when it gets more gas to get up a hill it starts to clang and cling(or ping and pang). Thats the best way I can describe it. And it's not just in the cab that I can hear it, but when I roll the window down I can hear it too. It's like taking a car key and constantly hitting a piece of aluminum foil.But the loudest times I hear it is in hot weather.
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Kowalski
GenIII
11/03/2006
17:54:55
| RE: Grinding while accelerating
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Now its starting to sound more like you are describing pinging. Have you tried higher octane ?
mikesz - I'm not sure you can claim higher octane in Europe by comparing the #'s. How is octane determined in Europe ? Here it is determined by the average of two different methods - one is the "research method", I forget what the other method is that they average in. That could skew the #'s.
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Ken S
Dodge Dakota
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11/03/2006
23:55:19
| RE: Grinding while accelerating
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I don't think it's pinging. It only does it in drive. That wouldn't be pinging would it? I don't know, maybe I'm just causing more trouble than it's worth.
And no, I've never tried higher octane. I didn't know if it was recommended for my truck. But I guess it wouldn't hurt, huh.
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mikesz
*GenIII*
11/04/2006
02:22:42
| RE: Grinding while accelerating
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Kowalski
i know there is a different method .Your 87 regular is equivalent of European 91.the point is that at least in Poland,lowest possible You can buy is '95.I saw 91 in Germany,but it is no popular in other countries
mikesz
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