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Slick_Willy
Dodge Dakota
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2/02/2006
14:23:28
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 Subject: Bad things happen at 1500 RPM's
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First the facts, and only the facts :
'99 Dakota 3.9l manual trans. 119k on the clock. Daily driver with only
work done in the last 3 months being 4 new tires.
Minor tidbits before I get to the crux of my problem. When I'm slowing for
a stop sign or red light, my truck will idle right at 1000 RPM's until my
truck comes to a complete stop. Once I completely stop the RPM's drop to
about 650ish which is where it should be. It has done this consistently
for about 1 month, but didn't think much of it since it hasn't cause any
problems. It was a little annoying, but I figured since the MIL didn't
come on it wasn't anything to stop me from using my truck like normal. No
problems with drivability or fuel mileage.
My issue...
After about 10 miles in the truck this morning, the sound of the clutch hub
fan (I believe that's the name of the fan I hear when I first pull my truck
out of the driveway) was VERY loud. The sound was based on RPM's, as when
I pushed in the clutch, the sound went away. All internal gauges read
normal and no issues with drivability. I pulled over to the side of the
road and check underneath the hood. Nothing out of the ordinary.
Serpentine belt was tight and I haven't heard any slipping sounds in the AM
when it is damp out. No visible leaks or noises to draw my attention. I
revved the engine a little while listening and could hear the fan
"spooling" up, but it didn't decrease as it normally does when I first
drive the truck. I continued down the road and again, the fan noise
increased as my RPM's increased. The sweet spot seemed to be 1500 RPM's.
If I kept the truck below that it ran and sounded like it normally does,
but if I went over that, there were minor changes in performance of the
truck. There was a tapping noise (kind of like someone hitting a hollow
piece of aluminum tube with a ball peen hammer very lightly.) It was
coming from the passenger side of the engine, but I could not pinpoint
exactly where it was coming from. The fan continued to increase in noise
in relation to the RPM's. Once I was near my house, I increased my RPM's
to 2000, and the fan noise continued to climb. I didn't want to push it
and as it was I could drive 45MPH, so I got back home and drove my other
vehicle into work.
Any ideas? I didn't get a chance to look at anything as I was already late
for work, but will be looking at it tonight. Is there a sensor that
control's this fan and if so, what is it ? Also, any idea what the tapping
sound was. Any relationship with 1500 RPM's
Thanks and regards
Slick_Willy
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daddio
Dodge Dakota
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2/02/2006
16:17:28
|  RE: Bad things happen at 1500 RPM's
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Message:
it's probably time for a new clutch for the fan. with the engine off and cool grab that rad fan and check to see if you can wobble it from side to side.
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Slick_Willy
Dodge Dakota
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2/02/2006
16:27:05
| RE: Bad things happen at 1500 RPM's
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Is it hard to change out? Any idea's on price?
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daddio
Dodge Dakota
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2/02/2006
16:49:50
| RE: Bad things happen at 1500 RPM's
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not hard to change at all. use something to hold the pulley, a big wrench for that nut and a hammer and your done. probably about 25 bucks. i have an '00 w/3.9 and i have the aux electric fan so i dumped that clutch fan and mine runs practically the same temps w/o out it.
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slick_Willy
Dodge Dakota
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2/02/2006
17:04:37
| RE: Bad things happen at 1500 RPM's
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Thanks for the follow-up. I have a Haynes manual, so if I run into any problems, that should be of some help.
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slick_willy
Dodge Dakota
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2/03/2006
13:32:56
|  RE: Bad things happen at 1500 RPM's
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Just wanted to follow-up with the group, and specifically to daddio...
The fan clutch was the problem. Part price was ~$50 and nobody including AutoZone) had the specialty tool. AutoZone does have a fan clutch tool, but not for my specific truck. It mostly fits Ford's. Anyhow, ended up taking truck and part to my mechanic buddy and he swapped out the part for $40 ... Under $100 so that's cool with me.
Again, thanks daddio for the info.
Regards
Slick_Willy
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DJ
Dodge Dakota
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2/14/2006
22:33:15
| RE: Bad things happen at 1500 RPM's
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Message:
So, the bad fan clutch was causing the tapping noise too? That's got me thinking- maybe I should replace the clutch before suspecting my ticking noise is coming from the timing chain. My noise seems to come around when the truck warms up, which is when the fan clutch is supposed to kick in.
My truck is not running hot either.
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OBIO3
Dodge Dakota
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2/15/2006
21:17:47
| RE: Bad things happen at 1500 RPM's
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DJ...... go slow here lol. at what ever temp you start to hear the ticking noise, losen the belt and start her up for a half minute or so. Ticking gone? you need a cluch. Still there? You saved 50 bucks
So many problems .... So little time
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papa54
Dodge Dakota
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8/25/2007
20:35:57
| RE: Bad things happen at 1500 RPM's
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Message:
i cant seem to keep my dodge dakota at 1500rpm... it was a 2006 still at the dealers and about 2 months ago i bought it.. it rides so smoot but once in a while there is a trembling through out the truck when i begin to slow down . thought it was brakes at first but it doesnt happen all the time..it had 123 miles on it with a auto tranny.. which has factory towing pkg on it and fact. class 4 hitch. the mpg is directly related to rpm i think and the darned thing down shifts to quickly and upshifts to fast. a soon as you put the slighest pressure on gas feed it down shifts.if that makes any sence. mpg is killing me. any ideas ..as maybe an electric fan etc ...\
help...
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dodge dakota
Dodge Dakota
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8/29/2010
15:11:18
| RE: Bad things happen at 1500 RPM's
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Message:
i bought a dodge Dakota used and found out it had this issue.
found out the solenoid to the smog pump was bad
so the smog pump was not working. So the converter in the exhaust got part way plugged.
found out all of this after it blew out the Y in the exhaust.
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Carlinda
Dodge Dakota
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7/22/2011
10:49:58
| HtQJtuPQtQTo
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I really wish there were more acrtiles like this on the web.
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