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93dak4x4
Dodge Dakota
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3/29/2005
08:15:39
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 Subject: RE: 2003 3.9L Dakota
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i think the 3.9's biggest problem is tuning and technology. everybody is lookin for power and performance and you need to rememeber that the 3.9 is stemming from 60's technology. that being said, do a little work, injector sync, intake, exhaust and the truck runs pretty decent. i have to say that checking my injector sync probably made the biggest improvement in my truck out of anything i have done, 3 mpg and a TON more power. i was sure i was going to sell it, but now im not so sure.
93 CC 4x4 A500
135k mi (2nd tranny)
V8 tb
2k rpm stall converter
Flowmaster
High flow cat
3923's
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ace
Dodge Dakota
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3/29/2005
13:16:09
| RE: 2003 3.9L Dakota
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explain injector sync please
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racerX
Dodge Dakota
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3/30/2005
13:16:12
| RE: 2003 3.9L Dakota
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yes, do explain. i've seen this once or twice but havent really gotten a straightforward explaination as to how.
also see, 93dak4x4, yours is obviously a 93. tbi right? how do i get my injector sync set for an 02 mpi?
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BrandonG
GenIII
4/04/2005
10:00:39
| RE: 2003 3.9L Dakota
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Yes 93Dak4x4 please explain the injector sync. I have a 00' mpi so i am always lookin for a little bit more horses. Just sent out the money for a V8 TB so i would like to get more horses.
TIA-
BrandonG
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J and J Auto
GenII
4/05/2005
01:02:11
| RE: 2003 3.9L Dakota
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http://www.dodgedakota.net/boards/v6/11574.html
They are set at the factory anywhere from -6 to
0 they run a hell of a lot better from +3 to +6
better low end throttle response and gas mileage
will be noticed imeditly by doing this
The dealers are not alowed to go more than 0 and
-6 is normal setting
Larry
J&J Auto
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93dak4x4
Dodge Dakota
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4/05/2005
10:10:23
| RE: 2003 3.9L Dakota
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sorry about takin so long to respond, larry obviously hit the nail on the head for me. as for my truck bein tbi...wrong, its mpi. so its the same as your 02, 00 all of you guys can do it and it made a huge difference for me.
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ace
Dodge Dakota
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4/05/2005
17:37:41
| RE: 2003 3.9L Dakota
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im still kinda confused,
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93dak4x4
Dodge Dakota
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4/06/2005
08:33:38
| RE: 2003 3.9L Dakota
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motor at TDC rotor pointing at or near #1 wire
will be comp stroke will point towards pass side
of truck
damper at 0 always turn clockwise never turn back
or you will get any slop in the chain and dist
gear and be way off
looking from front of truck straight down over
rotor, pickup plat has 1 line marked cyl
with the rotor button centered over line 0
back edge of rotor lined with line towards the
clockwise position +3
most are set from factory at 0 to -6 not good
+3 to +6
1 degree on dist = 2 crank the intake opens 8
degrees before TDC and fireing the injector just
after this opens will catch it when both valves
are open and the scavaging effect will help draw
the fuel in faster while the exhaust and intake
are both open at the same time the exhaust pulse
actualy helps pull in the fuel (overlap) 32
degrees they are both open at the same time
Fireing the injector at 0 TDC you will miss this
and just be drawing with the piston down stroke
improved low end gas mileage and perf will be
noticeable from going to the plus side
They are all the same 3.9V6 5.2V8 5.9V8
92 to 03
Turning the dist counterclockwise moves the sync +
turning clockwise moves towards -
line rotor button 0 -o
line rotor button + side __o
line rotor button - side __
oooooooooooooooooooooooooooo
o being the rotor button
-Posted by larry on a previous board
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wade
Dodge Dakota
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4/07/2005
22:15:44
| RE: 2003 3.9L Dakota
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i have read this over and over and over, and it just isnt making sense to me...do i take off the distributor cap and move the distributor itself?
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93dak4x4
Dodge Dakota
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4/07/2005
23:57:09
| RE: 2003 3.9L Dakota
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ok, i will explain it myself then.
1. Put the motor at TDC on the compression stroke (rotor will be pointing toward the passenger side (cyl number 1))
2. if you havent already pull off the distributor cap and look straight down over the rotor. there will be a line marked "cyl #1"
3. The front rotor should be pointing either directly at this line or slightly toward the cab of your truck. this is 0 to +3
4. if it is not in that position (which it wont be) loosen the distributor and turn it so that the rotor is positioned on that line or a "rotor width" toward the cab.
O____ = +3
as if O was the rotor and _____ was the cyl line.
O---- = 0
______
O = Bad
5. Tighten the distributor (1/2" bolt), put the cap and wires back on and go for a drive.
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cj
Dodge Dakota
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4/08/2005
03:14:59
| RE: 2003 3.9L Dakota
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so why then does dodge usually set it at -6?
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93dak4x4
Dodge Dakota
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4/08/2005
08:28:10
| RE: 2003 3.9L Dakota
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who really knows why they set it negative. maybe because they have stock in oil companies and want your money? maybe because machine tolerances and/or un-skilled workers are incapable of making it set to +3 or +6. you would have to ask dodge that question, we can only speculate, all i know is that my truck runs ALOT better.
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cj
Dodge Dakota
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4/08/2005
13:46:38
| RE: 2003 3.9L Dakota
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by the way your detail (larry and 93dak4x4) is really good and I plan on doing this and giving you guys results too. I have a 99 dakota 4x4 w/ 3.9. only thing I ask is what do you mean when you say "1. Put the motor at TDC on the compression stroke"? everything else is clear.
I don't know much about messing with the distributer caps on these trucks at all, and i guess i heard ur not suppose to turn it a certain direction or it will mess it up?
The only time ive messed with dist caps is on my Dad's 1969 restored Camaro conv. w/ 350. Obviously he taught me how to work on it and its easy as pie compared to todays vehicles. Thanks
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Bob Lincoln
Dodge Dakota
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4/08/2005
14:30:17
| RE: 2003 3.9L Dakota
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Nice, clear explanation. Two questions:
1) I have read that you have to crawl on top of the motor to look straight down at the index mark on the dist. I know the dist is buried back there, is the best access point to crawl in and sit on the fenderwell?
2) What is the best access point for turning the crankshaft? Underneath? The clutch fan seems to be in the way from above.
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racerX
Dodge Dakota
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4/08/2005
18:47:19
| RE: 2003 3.9L Dakota
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alright, i'm at TDC, got the cap off, see the cyl 1 line, distributor is pointing a little bit toward the front of truck (in the negative a few degrees.)
now, how do i actually loosen the distributor to turn it toward the cab to the + side?
kind of a bitch to get back there, tihs woulda been great to do when i had the manifold off doing the belly pan/gasket match lol
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wade
Dodge Dakota
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4/08/2005
19:53:10
| RE: 2003 3.9L Dakota
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Thank you very much, i understood that interpretation much better!!!!! now out to the garage i go!!
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racerX
Dodge Dakota
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4/08/2005
20:00:10
| RE: 2003 3.9L Dakota
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alright i found it, the 1/2" under the dist on the passenger side. tight squeeze back there.
just got back from a quick spin. notice a little low end response, just kinda ran around the block though, idle seemed slightly smoother. i only gave it a nudge counterclockwise though, maybe it needs a tad more. guess i'll see driving to work tonight and with checking my mileage, maybe i'll give it a little bit more of a turn when i get back from work tonight. thanks a bunch larry & 93dak!
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wade
Dodge Dakota
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4/08/2005
20:55:35
| RE: 2003 3.9L Dakota
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ok, got the TDC I think!?!?
here is whgat it looks like...
_____ <--line marked #1
o pointer...
it almost like my pointer is 90 degrees before it reaches the line......but on my dampner it is at TDC
please post and help me fix this, i dont want to leave my truck torn apart all night....also where exactly is the 1/2" bolt located, i have 2 square looking bolts 180 degrees from eachother on either side right below the distributor
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ben
Dodge Dakota
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4/08/2005
22:01:07
| RE: 2003 3.9L Dakota
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What does TDC mean?! and whats it do?
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wade
Dodge Dakota
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4/08/2005
22:06:36
| RE: 2003 3.9L Dakota
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Ok guys, i feel like a complete idiot, im sorry for all the questions on this matter, but i like to be very thorough when doing a task i have failed in the past, non-theless, i found i was not quite at TDC yet, with a small turn, VIOLA!!! and then i found the 1/2" bolt with ease and done deal, took it for a spin and noticed a HUGE!! pick-up in low end, and as for the gas milage we will see..
I appreciate all of your help and patience...
and for those of you wanting to do this, but still a little confused, write me at cstmdak@aol.com (i took pics of step by step)
soon as i can get them all up i will post it for the rest of the people here...
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