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Nathan Franci
Dodge Dakota
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4/19/2005
00:37:16
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 Subject: 2000 3.9 injector sync completed!!
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Message:
...welp i knocked out the injector sync today...hopfully it bumped my gas mileage up....it wasnt bad at all....i advanced mine till the trailing endge of the rotor was in line or almost in line with the 0 line....seemed to give it a lil more lug....down low....i just hit 50,000 today...its a 00 club cab 2x4 with a auto...been a good truck so far...wonder what my gas could be best possible....for mostly highway...i got 18 b4 this mod...mostly highway.....any thoughts
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FasstDak
Dodge Dakota
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4/22/2005
12:25:06
|  RE: 2000 3.9 injector sync completed!!
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Message:
Setting the fuel sync with a voltmeter will only get you "close". Have a local dealership (or shop that has a DRB-III or SnapOn MT2500) check it for you.
Best range for the Fuel Sync is "6" +/-1. Unless you're way off on the sync, there will be no change in mileage...only throttle response.
The fuel sync controls the injector pulse-width (how long they stay open).
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93dak4x4
Dodge Dakota
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4/23/2005
10:27:47
| RE: 2000 3.9 injector sync completed!!
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i adjusted my sync, picked up 3 mpg and gained a metric $hit ton of pickup. mine should be approximately +3 (1 rotor width toward the cab of the #1 cyl line)
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FasstDak
Dodge Dakota
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4/23/2005
10:34:22
| RE: 2000 3.9 injector sync completed!!
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Message:
It should be at "0" but best performance is at "6" +/-1. Mileage isn't affected that much unless it was really out of adjustment either by the factory or by some other shop checking it.
Checking it with a voltmeter or visually is not the proper, nor the correct way. Dodge got rid of the voltmeter method in '96 as it's not accurate at all. DRB-III or SnapOn MT2500 will check it for you properly as it needs to be set with the engine running and at 1000rpm.
How do I know this? I'm a Chrysler/Dodge certified Technician (MasterTech 2004/2005).
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J and J Auto
GenII
4/24/2005
08:45:06
| RE: 2000 3.9 injector sync completed!!
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Message:
Master tech
Injection sync does not control pulse width but
timming when the injector does pulse
Pulse width is controled by computer, load, rpm
vehicle speed, engine temp and o2 for A/F ratio
closed loop
You need to call mopar tech and get your info
straight
248-969-1690
Larry
J&J Auto
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FasstDak
Dodge Dakota
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4/24/2005
12:21:53
| RE: 2000 3.9 injector sync completed!!
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Message:
The Fuel Sync (aka: Distributor Index) does control the injector pulse width timing (and to an extent on how long). This is determined by the index. Quicker/Shorter (negative) and Later/Longer (positive) settings determine this. Yoiu are correct with the sensors that you listed...but you also forgot gear selection and throttle position.
The O2's don't control A/F, they only sense what's in the pipe (air/oxygen - how much) and the PCM controls this also via other inputs. Open loop is also affected to an extent by O2. It's not just a simple table either.
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N56629
Dodge Dakota
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4/24/2005
13:16:27
| RE: 2000 3.9 injector sync completed!!
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Sounds like a case of - my tech is better then your tech. I wish I had a buck for every time two techs had different opinions or explainations.
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FasstDak
Dodge Dakota
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4/24/2005
13:47:14
| RE: 2000 3.9 injector sync completed!!
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Message:
It really comes down to general wording or technical details. I can post both but don't as it can confuse the average person or is way too technical for some to understand.
Ultimately, you wind up with the same answer though.
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SloowDak
Dodge Dakota
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4/24/2005
23:57:37
| RE: 2000 3.9 injector sync completed!!
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FasstDak= Bernd D. Roush
http://www.dodgetrucks.org/fasstdak/
Check it out!!!!!!
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Sloowdak
Dodge Dakota
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4/24/2005
23:59:03
| RE: 2000 3.9 injector sync completed!!
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Message:
FasstDak= Bernd D. Ratsch
http://www.dodgetrucks.org/fasstdak/
Check it out!!!!!!
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GB2000
GenIII
4/25/2005
04:01:00
| RE: 2000 3.9 injector sync completed!!
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Message:
Oooh shiiiit...all hell's gonna be breaking loose...
Josh Blackshire - Owner, Ohio Dakotas .NET
Red 98 Dakota Sport - Check it out!
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FasstDak
Dodge Dakota
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4/25/2005
07:36:34
|  RE: 2000 3.9 injector sync completed!!
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Message:
All you had to do was ask.
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J and J Auto
GenII
4/28/2005
09:16:07
| RE: 2000 3.9 injector sync completed!!
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Message:
load
engine vac (map sensor)
throttle position (TPS sensor)
computer reading for load
in gear going down the road
Larry
J&J Auto
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FasstDak
Dodge Dakota
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4/28/2005
09:33:57
| RE: 2000 3.9 injector sync completed!!
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Message:
It also varies on gear selection and speed.
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