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Fed
Dodge Dakota
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10/19/2005
12:05:03

Subject: weird grinding noise @ 1800 RPMs...
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'93 Dak 3.9l CC auto w/ 3.55s if it helps any

but whenever im cruising with barely any throttle around 40
mph with the O/D off this strange grinding noise comes on and
off as the RPM meter is in the neighborhood of 1800...

any replys would be greatly appreciated

thanks
fed



Fed
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10/20/2005
11:38:13

RE: weird grinding noise @ 1800 RPMs...
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...anyone?



jimmyu
Dodge Dakota
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10/21/2005
15:18:36

RE: weird grinding noise @ 1800 RPMs...
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detonation



DaveT
Dodge Dakota
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10/22/2005
13:04:23

RE: weird grinding noise @ 1800 RPMs...
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Mine does that sometimes and I'm wondering if the fan has anything to do with it.



Fed
Dodge Dakota
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10/23/2005
16:26:13

RE: weird grinding noise @ 1800 RPMs...
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hmm i have no idea thanks a lot though

could u please explain detonation jimmyu?

thanks again
fed



jimmyu
Dodge Dakota
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10/23/2005
17:49:25

RE: weird grinding noise @ 1800 RPMs...
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detontation in a nutshell is when your motor runs at a higher tempurature than normal (combustion chamber) and the exhaust valve gets so hot that it actually causes the fuel-air mixture to ignite before the piston gets to TDC.



toolfan
Dodge Dakota
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10/23/2005
19:03:32

RE: weird grinding noise @ 1800 RPMs...
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if your engine makes a pinging noise than it could be detonating at the wrong time. if it was detonating wrong than i dont think it would do it at 1800rpm more like at 3000rpm and above.

it could have to do with the tranny if it only happens with the O/D off. i would have the tranny drain and looked at by a trans guy you trust. have the rear end fluid changed.



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