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Richard
Dodge Dakota
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2/13/2010
23:46:46
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 Subject: Engine Repair/Mods
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Message:
first off i would like to know if the 3.9L magnums have a knock sensor and EGR valve, and if so, where are they located?
Secondly, does putting a V8 throttle body on the 6 Cyl decrease fuel economy?
thirdly, When my engine is cold (during winter) it makes a whistling noise until you hit the gas a bit. what is cuasing this?
How many oxygen sensors are there and where are they hidden?
thanks for time!!
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psssssst
Dodge Dakota
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2/14/2010
08:13:58
|  RE: Engine Repair/Mods
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We need to know the year
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Richard
Dodge Dakota
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2/14/2010
09:55:37
| Engine Repair/Mods
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its a 1999 Dodge Dakota
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psssst
Dodge Dakota
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2/14/2010
12:12:56
| RE: Engine Repair/Mods
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Message:
Me again
OK 1999 3.9's do not have an EGR or knock sensor.
I don't even think they used the knock sensor
untill they went to the 3.7's & 4.7's
"Secondly, does putting a V8 throttle body on the
6 Cyl decrease fuel economy? "
Yes & NO
Drive normal like you have been you'll be ok
infact might even see a slight increase in MPG's.
However
You will get a slight increase in HP & TRQ.
and more then likely you'll went to have fun with
it.
You'll need a TB from a non EGR motor
one of the other guys will have to help you with
years. (If memory serves me right I think 96 was
the last year for EGR) But I'm not positive.
Also you may need the throttle cable from the
donor truck/van.
"How many oxygen sensors are there and where are
they hidden"
You will have 1 before and 1 after the Cat/Cats.\
Rather easy to find just look for the wires/Plugs.
Hope this helped
need anymore just ask. & welcome to
dodgedakotas.com
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Richard
Dodge Dakota
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2/14/2010
13:26:50
| RE: Engine Repair/Mods
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do throttle body spacers really do anything?
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psssst
Dodge Dakota
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2/14/2010
13:34:57
|  RE: Engine Repair/Mods
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"do throttle body spacers really do anything?"
Yes
They make awsome paper weights!
Pick your favorite color.
As for performance & MPG's NO
Swirling the air before the gas is mixed in
does nothing.
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Richard
Dodge Dakota
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2/14/2010
14:21:27
| RE: Engine Repair/Mods
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Message:
do those magnet things really help for fuel economy or no?
thanks
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Richard
Dodge Dakota
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2/14/2010
14:23:42
| RE: Engine Repair/Mods
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Message:
on cold days when i start my 1999 dakota it has a whistle to it untill i press the gas down a bit. what causes that?
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dakownr
Dodge Dakota
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2/14/2010
20:12:50
| RE: Engine Repair/Mods
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'96 model-year was the FIRST year for OBD-II, so the last year for EGR would have been '95.
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Richard
Dodge Dakota
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2/15/2010
14:15:39
| RE: Engine Repair/Mods
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Message:
If the PCM doesn't register speed until 60km/hr would that
affect my air/fuel ratio to be higher then normal at slower
speeds? (1999 Dakota )
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daddio
Dodge Dakota
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2/15/2010
15:24:26
| RE: Engine Repair/Mods
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Message:
Richard, your speedometer doesn't register until 60km/hr? Another question, Are your ABS and BRAKE lights on? If you have all 3 of those your RWSS(Rear Wheel Speed Sensor) maybe out.
Now to answer your question, No. The air fuel ratio is determined by a few things but I don't think speed is taken into account for that. Engine speed but not vehicle speed.
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Richard
Dodge Dakota
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2/15/2010
15:44:22
| RE: Engine Repair/Mods
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Message:
My mechanic plugged his OBDII device into my truck and the
PCM wouldn't show speed until about 60km/hr. He thinks it's
a PCM problem. What do you think?
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daddio
Dodge Dakota
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2/15/2010
16:57:39
| RE: Engine Repair/Mods
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Message:
Richard, again,
your speedometer doesn't register until 60km/hr? Another question, Are your ABS and BRAKE lights on? If you have all 3 of those your RWSS(Rear Wheel Speed Sensor) maybe out.
If you could answer my questions I may be able to answer yours.
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Richard
Dodge Dakota
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2/15/2010
20:38:19
| RE: Engine Repair/Mods
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Message:
Yes my PCM and speedometer do it. But tranny sensor and
wire are good. But no ABS and brake light are off.
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daddio
Dodge Dakota
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2/16/2010
10:02:53
| RE: Engine Repair/Mods
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Message:
It is very rare that a problem with a PCM comes up. I have never seen a post on here with a problem like yours. I would think it's more a sensor problem than a PCM problem.
How did you check the tranny sensor?
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Richard
Dodge Dakota
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2/16/2010
10:47:00
| RE: Engine Repair/Mods
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Message:
I replaced that sensor completely. Where is that other
sensor? In the differential ?
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daddio
Dodge Dakota
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2/16/2010
11:02:10
| RE: Engine Repair/Mods
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Yes, the RWSS in in the rear diff. at the topof the center section.
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Richard
Dodge Dakota
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2/16/2010
16:40:46
| RE: Engine Repair/Mods
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Message:
well i getting another PCM for dirt cheap so i will try that.
what would cause whistling on cold cold winter days at idle?
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Richard
Dodge Dakota
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2/17/2010
16:39:06
| RE: Engine Repair/Mods
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Message:
how much are those MOPAR ECU's?
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