How-To MAP Sensor Upgrade (The Hard Way)

This thread was originally created on MSF by @ColonR back in January of 2012:

ok i said i would make this how to since no one seems to have made one before so here it is. Sorry the pictures are attached in the correct order but im not sure how to add them to the thread itself MODS please help ill say where each image goes.

tools needed:

Bosch 3bar map sensor
Bosch 3bar pigtail harness for map sensor
wire strippers
Solder
soldering gun
heat shrink(not required but helpful)
1 zip tie
allan wrenches or size 7mm ratchet head depending on what bolt is holding the oem map sensor in place.

to begin you have to locate the stock map sensor which is located to the immediate left of the dip stick for the oil, it is a small black L shaped plastic piece with one bolt in it going into the intake manifold.
Image 1))

The first thing to do is reach down and unclip the harness from the bottom of the stock map sensor it should be a one side slip and push in and pull down and it should unattach. Next use the allen wrench or ratchet and take out the bolt holding in the stock map sensor and then remove the sensor.

Next you will notice that the harness that the stock pigtail is on is attached to a bracket that is also mounted to the intake manifold. THere are 2 bolts holding this bracket on, i removed them both and pulled the bracket out completely since it is not needed and often times just gets in the way. Once this is removed you will see the harness splits in 2 directions where the pigtail is for the stock MAP sensor. One side leads to the plug and the other leads under the intake manifold which will limit the amoun of space you have to work on soldering.

If you look under the intake manifold past the MAP sensor you will see where the other piece of the harness is attached. THere is an additional plug that you can either unplug, or do what i did which was to simply detach it from where it was clipped. Once this is unclipped you can pull the pigtail up and have some more room to work with.

THIS NEXT PART NEEDS TO BE DONE CAREFULLY! for some reason bosch does not color code the wires on the new pigtail so when you are cutting off the old pigtail make sure you know which way the wires were going so that you dont reattach them incorrectly!!!.

Clip the stock pigtail off as close to the old sensor head as possible which will give you some wire to work with. Next make sure you have the wires in the same position that they were on the original pigtail. THE CLIP ON THE ORIGINAL ONE WILL BE FACING UPWARDS AKA AWAY FROM THE INTAKE MANIFOLD. MAKE SURE THE NEW PIGTAIL IS KEPT FACING THE SAME WAY SO THAT THE WIRES WILL LINE UP CORRECTLY.

THE WIRES ON THE HARNESS (FROM LEFT TO RIGHT) WILL BE YELLOW/BROWN, RED/BLACK, RED/YELLOW, AND BROWN.
Image 2))

the next thing to do is keeping the new bosch pigtail with the clip facing up begin attaching the new pigtail wires to the old harness, preferably one at a time. use the wire strippers to strip off about half an inch of rubber from the end of the haress wires and the end of new bosch pigtail wires. (keep in mind the bosch sensor gives you about 6inch of extra wire so cut off excess accordingly). At this pint if you are using the shrink wrap stuff put some on the wire so that once its soldered you dont suddenly realize its not on there. Take both the old harness and the bosch pigtail wires and twist them together on the exposed wire you just stripped and then apply a little solder.
Image 3))

Once the solder has set bring the shrink wrap stuff over where you soldered and heat it causing it to shrink around the soldered area sealing it well. repeat this process on the other 3 wires but remember TAKE YOUR TIME!!! do one wire at a time and you can avoid mixing up wires.

Once you have soldered all the wires and have the harness attached gather up all 4 wires and hold them tightly and apply heat tape around the wires, bunching them into one coil.

Image 4)))

GOOD JOB your almost done haha Next put the bosch map sensor into the same place that the stock one was located and screw the piece back in to hold it securely. Take the new bosch pigtail and plug it into the sensor and you now have a working 3bar map sensor congrats!

Some people might be wondering what to do with the piece of the original harness that we unplugged or unclipped in order to get more access to the original harness. If you unplugged it just plug it back in but if you unclipped it from the bracket good luck getting it back in. The easiest thing to do is to ziptie the harness piece to the larger wiring harness that is located next to the map sensor that will contain a large grey clip shown in the photo.

Hope this helps let me know if you guys need more info. I do not take repponsibility if one of you guys screws up your cars

mods can you please attach these photos into the areas on the above thread where i put which image should be where? they are in order from left to right

hey guys can you look at attached logs and let me know what you think? 278hp 328lbft on mustang dyno. Getting a little knock but unsure if its all that bad. Also attached VD dyno, look about right for dyno jet? Dp,tp,hpfp,cs tmic,hks bpv,sri.

**UPDATED** New logs. Two pulls in each gear minus 6th. Logs are short and sweet. 57 degrees ambient at 3000ft.