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Noah
Dodge Dakota
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10/07/2002
21:02:44
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 Subject: Engine Roar on startup?
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Message:
Mabey 10 times since I've owned the truck, when I start up the engine and press the gas pedal the engine is loud like a roaring sound. It does this as I slowly take off thru the parking lot and until I get out on the street and accelerate up to the speed limit. Weather plays no part.
Anyone ever experienced this?
2001 4.7 Auto 2wd 25,000
Thanks.
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Bob W
GenIII
10/07/2002
21:13:34
|  RE: Engine Roar on startup?
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Clutch on your Fan.
Gibson headers, Gibson Cat-back, Edelbrock IAS shocks, K & N drop in, 180 stat, Jet stage II chip, ARE Lid
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Noah
Dodge Dakota
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10/07/2002
21:20:05
|  RE: Engine Roar on startup?
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Is this anything to worry about? Does something need to be fixed? Thanks.
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Andy
Dodge Dakota
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10/07/2002
21:26:45
|  RE: Engine Roar on startup?
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mine does that also its like it revs up real high before it shifts right its not a big deal
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alex
Dodge Dakota
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10/07/2002
21:27:15
| RE: Engine Roar on startup?
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Message:
normal. nothing needs fixing.
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Bob W
GenIII
10/07/2002
21:28:10
| RE: Engine Roar on startup?
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Message:
No most of the 4.7s do it once in a while. Mine always slows down before I get to the corner.
Gibson headers, Gibson Cat-back, Edelbrock IAS shocks, K & N drop in, 180 stat, Jet stage II chip, ARE Lid
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Noah
Dodge Dakota
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10/07/2002
21:30:26
| RE: Engine Roar on startup?
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Great. Thanks all!
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Fe_Ring
Dodge Dakota
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10/09/2002
22:35:36
| RE: Engine Roar on startup?
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Message:
I talked to the dealer that I've always dealt with and it's normal. Apparently it's a fan forcing air into the engine faster to help the engine get up to temperature faster. It's supposed to be on for approx. 40seconds at start up. He said all the v8's in the Dodge Line up will do it.
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Noah
Dodge Dakota
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10/09/2002
23:30:01
| RE: Engine Roar on startup?
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Fe_Ring,
Did the dealer say what conditions must exist for the fan to do that? It happens so infrequently?
I've had it happen in cold and warm weather, and with rain. Like I said, mabey 10 times in 25,000 miles.
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D_ManOH
Dodge Dakota
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10/10/2002
01:42:55
| RE: Engine Roar on startup?
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Message:
Noah, your fan diagnosis is wrong. If the engine ran properly, you wouldn't have the "fan" problem. The engine "roar" isn't the fan. Go to the dealer.
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Free_Dakz
Dodge Dakota
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10/10/2002
06:32:32
|  RE: Engine Roar on startup?
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The fan clutch only comes into play if the fan belt is loose. It probably squeeks bad. You need to have the timing chain replaces ASAP.
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alex
Dodge Dakota
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10/10/2002
09:03:19
| RE: Engine Roar on startup?
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Message:
Okay... I really didnt' want to have to explain this whole damn thing, but now that there's BS floating thru the air, I guess I have to explain it.
The radiator fan on the Dodge trucks is coupled to the engine with a viscous clutch unit. This allows the fan to "slip" and not turn as fast as the engine's rpm at all times. Otherwise it would roar liek that all day every day. This helps you get better mileage and keeps things quiet.
But overnight, the fluid in the clutch unit leaks into the passages in the unit that cause the clutch to lock up. So, until the fluid warms up in the morning and seeps back into the passages that make the clutch disengage, the fan is spinning at the same speed as the engine. It makes a loud roar. Once the fluid seeps back into the correct passages (usually only takes a second or two in the morning), it disengages and the fan is once again turning, but not at the saem speed as the engine.
The only other time you will get this roar is when the air temperatures are insanely hot in the dead of summer when it's 100+ degrees outside. These temps cause the fluid in the clutch to lock the unit up and spin the fan up to the speed of the engine and it roars in the middle of summer.
It's just the viscous clutch on the radiator fan doing its job properly.
It is normal. Noah, relax. It's okay.
The rest of you morons, shut the F up.
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Texas Todd
Dodge Dakota
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10/10/2002
10:24:45
| RE: Engine Roar on startup?
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Message:
Alex, Right On!!
Can you believe this BS, 'take it to the dealer'
c'mon guys, if your not sure-keep it to ur self.
Now, GET RID of the Belt fan and clutch. You DON'T need it!!!!!!!!!!!!!
You free up several horses!
I'm not going into it here, search the archives, please.
Mines been off for a year, EASY to do, 1 bolt, temp gauge never reaches 1/2 way.
I'm in the Houston area-it's hot here, towing, etc.
01, QC, 4.7, 5spd, Trailer Towing, tire and handling pack, home brew air, AIT adjuster, perted 68mm TB, no stink'n belt fan/clutch
SLT, infinity sound, spray on bed liner, Leer custom shell(looks like a stretched Durango), fender flares, 2 tone paint, etc.
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Noah
Dodge Dakota
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10/10/2002
14:40:22
| RE: Engine Roar on startup?
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Message:
Thanks Alex for explaining that. I appreciate it.
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mswanda
Dodge Dakota
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11/14/2005
08:59:27
| RE: Engine Roar on startup?
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Message:
I have a 2002 dodge durango the enigine has started to be loud when i start it up. It doesn't matter if it is early in the morning or not. Can anyone help me?
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toolfan
Dodge Dakota
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11/14/2005
18:56:12
| RE: Engine Roar on startup?
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Message:
my truck is loud too, but i have a fuking Flowmaster!!!!!!
i hate the damn fan its sound like a Ford v8.
noah that is normal and mine does it often as well. "its when its not spinning" then you have a problem.
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not noah
Dodge Dakota
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11/15/2005
12:05:25
| RE: Engine Roar on startup?
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tool, i'm sure noah would have appreciated the time you took to reply to his three year old post....hahaha
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Lawrence
Dodge Dakota
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11/15/2005
20:40:01
| RE: Engine Roar on startup?
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Message:
My 05 Dakota V8, QC, Auto, 3.92 does the exact same thing, usually when the truck has been sitting over night. But not always. Maybe 2 or 3 times in a week.
The roaring sound usually goes away (fan clutch dissengages) by the time I accelerate and the trans shifts into second.
Truck runs great, happy customer.
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dough041
Dodge Dakota
JOIN HERE
11/16/2005
08:38:00
| RE: Engine Roar on startup?
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Message:
My 4.7 initially didn't have the "roar" when first starting, then when I went to tow my boat it started to overheat upon completing a trip. Found out it was the fan clutch, when fixed I got the "roar" and the fan clutch was working. Just recently, noticed the "roar" gone, found it to be the fan again... On mine, as long as I hear that "roar" upon start up I know the fan is operating properly- and cooler..
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