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Gregg
Dodge Dakota
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6/08/2005
18:37:43
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 Subject: Noise has Stumped the Pros
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'99 3.9, 70K mi. When warm - idle - only in drive I hear a cyclic da…da, da low tone like exhaust pulses. Had the trans fully serviced thinking only in drive might be a tranny issue. Nope, trans good. Did the mechanics stethoscope trick listening to many points on the engine including the pan - no identified hot spot.
The odd thing is, it only duplicates when fully warm (180 T-stat), at idle and in drive or reverse. Slip it into neutral or park - noise is gone. I thought the slight load from the trans was causing the engine noise to appear. After going nutty chasing it I rolled into the dealer. Two mechanics poked and scratched their heads. "Don't worry unless it gets worse" was the collective answer. The sound is heard in the cab and in the firewall area behind the engine and is the same level above the engine and below.
Any guesses?
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bigdave
Dodge Dakota
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6/08/2005
19:40:51
|  RE: Noise has Stumped the Pros
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My 97 did that too, it was the torque converter.
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Dan M
Dodge Dakota
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6/08/2005
20:15:00
| RE: Noise has Stumped the Pros
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I was going to say torque converted. Had something similar to on my old ranger.
- Dan M
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93dak4x4
Dodge Dakota
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6/08/2005
20:55:22
| RE: Noise has Stumped the Pros
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dont wait if its the torque converter, my converter took a crap and took the tranny with it. fried it good. so beware
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Gregg
Dodge Dakota
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6/09/2005
01:58:04
| RE: Noise has Stumped the Pros
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Torque Converter, right, I thought that may the bugger as well. The trans service was only visual and if they road tested doubt it reached op temp.
Thanks for the input gents! Wish I had a way to verify the converter. The trans shop crooks will say "oh yeah that's it" and you know their response when it isn't.
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Gregg
Dodge Dakota
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6/09/2005
17:35:13
| RE: Noise has Stumped the Pros
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Doh!, not the T-converter or the flex plate just pulled it off the rack at the trans shop. The sound seems local to the front of the oil pan under the hamonic balancer. I used a real stethescope this time. The sound still could be telegraphing from somewhere else but this is the loudest point.
Sounds to all like a smog pump "thunk thunk thunk". Uh, it doesn't have a smog pump or even an EGR as far as I can tell. Go thunk.
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Bob Lincoln
Dodge Dakota
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6/09/2005
20:32:15
| RE: Noise has Stumped the Pros
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Take a look at the harmonic balancer. It's the disk behind the crankshaft pulley. It's metal with a hard rubber core, and the rubber gives out. Mine had a wobble about 1/8" out of its plane. Left untreated for a long time, it can kill the crank bearings. There should be virtually no wobble to it with engine running. I think it's about $80 plus labor. I had it done with the timing chain.
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