3 Wire Fuel temp Mod, 3406E - TheDieselGarage.com
Thread Details Posted by KET19, this thread has received 35 replies and been viewed 34936 times.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 36 (permalink) Old 03-08-2010, 12:07 AM Thread Starter
Junior Member
 
KET19's Avatar
 
Join Date: Feb 2010
Posts: 71
Points: 22,724
Thanks: 13
Thanked 15 Times in 10 Posts
3 Wire Fuel temp Mod, 3406E

I know,, i have read many times that the fuel temp mod has been written about many times,, however,, i could not find a drop dead way that workrd or did not have a problem.. So.

Here is what i did, using a Prolink 9000 in the data mode i read the fuel temp as it was ,, un modified,, 42deg..

Long story short, here is what i did.
Run to Radio Shack and buy a 5 pac of 150 ohm resistors... Go to the truck and Skin back the oarnge and white wire,,, leave the black wire alone,,, take 3 of the newly purchased 150 ohm resistors out of the packet and hook them together in a Series,, (3 in a row) solder them,, now take one end and wrap it into the oarnge wire,, and the other end on the white wire.. Solder,, wrap it up = Done..

Here is what you have accomplished,, the ECM will see a fuel temp of 160deg with no trouble codes,, this is reading the actual fuel temp readings on the Pro Link !! The changes ar every consistant and i have experimented with the 100 ohm and 150 ohm resistors. Note* if you just unplug the sensor the ECM will see 86deg.

If this has been done before ,, my apologys for wasting your time . The only post i could find was one where *dont quote me on this* cut the one wire and hook the other 2 together and then a resistor,, did not work at all !!
This i figured up.

Best to ya all !!

Last edited by KET19; 03-08-2010 at 12:13 AM. Reason: Type o,, and now i cant find it
KET19 is offline  
The Following 3 Users Say Thank You to KET19 For this addition to TDG:
bojoe (03-09-2010), Les2 (03-08-2010), Lmackattack (03-08-2010)
Sponsored Links
Advertisement
 
post #2 of 36 (permalink) Old 03-08-2010, 12:56 AM
Senior Member
 
Join Date: Dec 2008
Posts: 472
Points: 41,395
Thanks: 70
Thanked 39 Times in 35 Posts
I was wondering how to do that with the 3 wire....Thanks!

Dumb question, thought you wanted the ECM to read the temps as cooler so it would dump more fuel to heat it up?
Les2 is offline  
post #3 of 36 (permalink) Old 03-08-2010, 01:13 AM Thread Starter
Junior Member
Threadstarter
 
KET19's Avatar
 
Join Date: Feb 2010
Posts: 71
Points: 22,724
Thanks: 13
Thanked 15 Times in 10 Posts
I understand what you are saying, but,, your thinking Gas motor. When I started messing with this mod I made the fuel temp read 0, zero. So I polish dyno"d it and got a 21 lb boost read out cause that confused me too, but I read on this site that,, Cats will put more fuel to a Hot, fuel condition, and I know for a fact thata certain % of HP is lost for every deg above 122 ??? I have slept since then and do not know the exact no"s.. When I got the fuel temp to the 160 mark it was 26 on the boost rite quick,,, a marked improvement.
KET19 is offline  
The Following User Says Thank You to KET19 For this addition to TDG:
Lmackattack (03-08-2010)
post #4 of 36 (permalink) Old 03-08-2010, 03:16 AM
The other guy
 
Join Date: Jan 2007
Location: Des Moines, IA
Posts: 3,906
Points: 70,443
Thanks: 31
Thanked 1,319 Times in 832 Posts
More fuel output hot, as the fuel is thinner requiring more delivery (solenoid duration). Max sendor temp is 162*. After fuel reaches that actual temp there is no gain from the shunt stick (theoretically)...
ynot is offline  
The Following 4 Users Say Thank You to ynot For this addition to TDG:
bojoe (03-09-2010), french277 (08-24-2010), Les2 (03-08-2010), Lmackattack (03-08-2010)
post #5 of 36 (permalink) Old 03-08-2010, 07:06 PM
Highway to Hell
 
Lmackattack's Avatar
 
Join Date: Jan 2006
Location: CHICAGO
Posts: 1,022
Points: 52,779
Thanks: 97
Thanked 67 Times in 57 Posts
Garage
QUESTION...CAN We use a single 450 ohm resistor or do we need the three 150 ohms?

1978 MACK RS700L
285 HP @2100 RPM 1080 TORQUE. @1200 RPM
2 STICK 6 SPEED, 4.17 REARS ON 34K CAMELBACK SPRINGS,206"WB, 4" STRAIGHT STACKS BLOWING BLACK,

OH...AND A FEW TWISTS OF THE FUEL SCREWS ....THANKS AGAIN... FJH!
Lmackattack is offline  
post #6 of 36 (permalink) Old 03-08-2010, 07:16 PM Thread Starter
Junior Member
Threadstarter
 
KET19's Avatar
 
Join Date: Feb 2010
Posts: 71
Points: 22,724
Thanks: 13
Thanked 15 Times in 10 Posts
Well sir,, good luck finding a 450. But yes you could. The fuel shiming is something I have yet to do and will have to search out the procedure on here somewhere.
KET19 is offline  
post #7 of 36 (permalink) Old 03-09-2010, 12:25 AM
Highway to Hell
 
Lmackattack's Avatar
 
Join Date: Jan 2006
Location: CHICAGO
Posts: 1,022
Points: 52,779
Thanks: 97
Thanked 67 Times in 57 Posts
Garage
sounds like you went looking for one.... I will see if any of my computer geek friends have a lead on them.... thanks for all this good info!

1978 MACK RS700L
285 HP @2100 RPM 1080 TORQUE. @1200 RPM
2 STICK 6 SPEED, 4.17 REARS ON 34K CAMELBACK SPRINGS,206"WB, 4" STRAIGHT STACKS BLOWING BLACK,

OH...AND A FEW TWISTS OF THE FUEL SCREWS ....THANKS AGAIN... FJH!
Lmackattack is offline  
post #8 of 36 (permalink) Old 03-09-2010, 02:45 PM
Member
 
Join Date: Apr 2006
Posts: 533
Points: 36,767
Thanks: 16
Thanked 58 Times in 48 Posts
Quote:
Originally Posted by Lmackattack View Post
sounds like you went looking for one.... I will see if any of my computer geek friends have a lead on them.... thanks for all this good info!
Found one.
Jfaulkner is offline  
The Following User Says Thank You to Jfaulkner For this addition to TDG:
Lmackattack (03-09-2010)
post #9 of 36 (permalink) Old 03-10-2010, 12:46 AM
Junior Member
 
Join Date: Nov 2009
Posts: 3,533
Points: 52,932
Thanks: 69
Thanked 651 Times in 574 Posts
At 42 degrees the ECM sees 160 degree fuel tempature, That gives you an increase in power for how long, and until what outside tempature. On a unit that has driven for say 5 hours how much extra HP do you get. I would think that the ECM would read that fuel tempature as out of range and go to the default setting. I have been wrong before but this seems like a fantasy fix.

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
Johnp3 is offline  
post #10 of 36 (permalink) Old 03-10-2010, 01:05 AM
Member
 
Join Date: Apr 2006
Posts: 533
Points: 36,767
Thanks: 16
Thanked 58 Times in 48 Posts
Quote:
Originally Posted by Johnp3 View Post
At 42 degrees the ECM sees 160 degree fuel tempature, That gives you an increase in power for how long, and until what outside tempature. On a unit that has driven for say 5 hours how much extra HP do you get. I would think that the ECM would read that fuel tempature as out of range and go to the default setting. I have been wrong before but this seems like a fantasy fix.
You see an increase in power until the fuel reaches 160* or above. As far as how long you see the increase that all depends on how big your fuel tanks are and how hot the outside temp is. It does work, that's why the fuel temp sensor is there in the first place, to compensate for the loss of power due to hot fuel. This mod just makes the ECM thing the fuel is always hot. Other resistor values have been tried but I think anything over 170* or so causes a check engine light and no added fuel flow.

I believe someone said this mod adds somewhere around 40-50hp and like 80 ftlb tq, dyno tested.
Jfaulkner is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
3406e restricter fitting in fuel return swaan Medium and Heavy Duty 35 12-29-2009 03:38 AM
Wanted: '96/'97 Fuel Bowl/FPR/Wire Harness hheynow Ford Parts wanted 0 11-16-2009 12:36 AM
fuel temp sensor? ehopp88ss 6.5L Diesel Engine 2 10-24-2009 10:12 PM
3406e fuel starvation CAT379 Medium and Heavy Duty 5 06-02-2009 02:59 AM
wire cut to bottom of fuel filter? highland 1994-2003 7.3L Power Stroke 6 04-16-2008 01:08 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome