cherokee4.0
NAXJA Forum User
- Location
- California
Well work was
Well work was slow today so I thought I’d make my contribution to this and the other Jeep forums I’m a member of.
I know many of you have been waiting for something like this. I apologize in advance for no photos as a digital camera is not available. Also, DO NOT DO THIS MOD IF YOU HAVE A CHIP OR ANY COMPUTER MODS!
First off, a little background…
What you will be building is a device that has a constant 12-volt input and puts out a constant 5+ volts output.
The output from this device will take the place of the existing source of 5-volt input power to your map sensor.
On my 98 4.0 (and probably on the 96 – 01 XJ 4.0’s) the map sensor is a black, flat rectangular device that is bolted into the driver’s side of your throttle body. It has a 3-wire connector that plugs into the front of it. It is the passenger side wire of the connector that you’ll need to splice into. This happens to be orange on my rig.
I followed this wire back a few inches and lifted it out of the black plastic 3-wire cover. I then snipped it and put a small female crimp-down connector on one of the snipped ends and a male crimp-down connector on the other snipped end. You should do the same cause when smog time comes you can just plug these 2 back into each other and hide them back in the plastic loom where they came from. Bend out of the way the end that no longer goes to your map sensor and see that it does not contact anything metal. This end is not used again until smog time.
Now the device itself takes (only a little) more skill and effort. Click on the link below and focus on the photo that is next to the text that reads “This shows how you would hook it together using the terminal strip.”
http://www.jeepbarracks.com/modules.php?name=News&file=article&sid=18
My device is much simpler looking than the photo. I simply grabbed a piece of ½ inch pine that I cut into a 2.5” X 3.5” rectangle. On this I screwed down the “terminal block” and wrote on the wood 12v input, 5v output and ground.
There’s no need for that “heat sink” thingee.
Yes, there’s only 3 wires involved in this guy. You’ll need to solder and assemble as their photo shows.
Now what no write-up tells you is the following…
Get a left hand finger under the left lowest corner of the radio/climate-control dash cover and a right-hand finger under the right lowest corner and pull STRAIGHT backwards. Have no fear because the 97+ years have metal clips that allow you to pull the thing on and off a thousand times without wear.
Pull the connector out of your cigarette lighter and use its positive for your 12v source and its black wire for your ground. The remaining wire you will punch through your firewall rubber grommet and connect to the spliced wire the goes to your map sensor. DO NOT TRY TO USE YOUR NOW-DEAD LIGHTER ANY MORE.
Before you connect to your map sensor, turn your ignition to the on position (not start position) and check that you’re putting out about 5 volts.
After connecting to your map sensor, start it up. You will now appreciate the fact that you’re locating your little wood-base adjuster next to your gear shift. Meaning, you can turn the screw thereby adjusting it while you drive! After you get the setting you want, you just rest the device at the bottom of your dash panel and snap it back on! Cool huh…
The cigarette lighter is your power source cause you only get power with the key in the on position.
If done and adjusted correctly, you will feel improvements in all pedal positions.
This is only for rigs that already have many flow improvements – exhaust, bored-TB, high-flow intake.
DISCLAIMER – THE AUTHOR TAKES NO RESPONSIBILITY FOR ANY DAMAGES TO YOUR VEHICLE.
DO THIS AT YOUR OWN RISK!
I’ve had this on my rig for several hundred miles and had to adjust it leaner (counter-clockwise) from my original setting about 5 times. The parts cost $17 at Radio Shack.
Good Luck!
Well work was slow today so I thought I’d make my contribution to this and the other Jeep forums I’m a member of.
I know many of you have been waiting for something like this. I apologize in advance for no photos as a digital camera is not available. Also, DO NOT DO THIS MOD IF YOU HAVE A CHIP OR ANY COMPUTER MODS!
First off, a little background…
What you will be building is a device that has a constant 12-volt input and puts out a constant 5+ volts output.
The output from this device will take the place of the existing source of 5-volt input power to your map sensor.
On my 98 4.0 (and probably on the 96 – 01 XJ 4.0’s) the map sensor is a black, flat rectangular device that is bolted into the driver’s side of your throttle body. It has a 3-wire connector that plugs into the front of it. It is the passenger side wire of the connector that you’ll need to splice into. This happens to be orange on my rig.
I followed this wire back a few inches and lifted it out of the black plastic 3-wire cover. I then snipped it and put a small female crimp-down connector on one of the snipped ends and a male crimp-down connector on the other snipped end. You should do the same cause when smog time comes you can just plug these 2 back into each other and hide them back in the plastic loom where they came from. Bend out of the way the end that no longer goes to your map sensor and see that it does not contact anything metal. This end is not used again until smog time.
Now the device itself takes (only a little) more skill and effort. Click on the link below and focus on the photo that is next to the text that reads “This shows how you would hook it together using the terminal strip.”
http://www.jeepbarracks.com/modules.php?name=News&file=article&sid=18
My device is much simpler looking than the photo. I simply grabbed a piece of ½ inch pine that I cut into a 2.5” X 3.5” rectangle. On this I screwed down the “terminal block” and wrote on the wood 12v input, 5v output and ground.
There’s no need for that “heat sink” thingee.
Yes, there’s only 3 wires involved in this guy. You’ll need to solder and assemble as their photo shows.
Now what no write-up tells you is the following…
Get a left hand finger under the left lowest corner of the radio/climate-control dash cover and a right-hand finger under the right lowest corner and pull STRAIGHT backwards. Have no fear because the 97+ years have metal clips that allow you to pull the thing on and off a thousand times without wear.
Pull the connector out of your cigarette lighter and use its positive for your 12v source and its black wire for your ground. The remaining wire you will punch through your firewall rubber grommet and connect to the spliced wire the goes to your map sensor. DO NOT TRY TO USE YOUR NOW-DEAD LIGHTER ANY MORE.
Before you connect to your map sensor, turn your ignition to the on position (not start position) and check that you’re putting out about 5 volts.
After connecting to your map sensor, start it up. You will now appreciate the fact that you’re locating your little wood-base adjuster next to your gear shift. Meaning, you can turn the screw thereby adjusting it while you drive! After you get the setting you want, you just rest the device at the bottom of your dash panel and snap it back on! Cool huh…
The cigarette lighter is your power source cause you only get power with the key in the on position.
If done and adjusted correctly, you will feel improvements in all pedal positions.
This is only for rigs that already have many flow improvements – exhaust, bored-TB, high-flow intake.
DISCLAIMER – THE AUTHOR TAKES NO RESPONSIBILITY FOR ANY DAMAGES TO YOUR VEHICLE.
DO THIS AT YOUR OWN RISK!
I’ve had this on my rig for several hundred miles and had to adjust it leaner (counter-clockwise) from my original setting about 5 times. The parts cost $17 at Radio Shack.
Good Luck!
