Thread: How to completely get rid of MAF on de-EGR'd TD5

Originally Posted by NWTASD2

Tutorial....... Tutorial...............

Do I cut the blue wire or the green one.......Or was it the red one.??

JOKE.........

Seriously though .any chance of some instructions for this mod?


Cheers

read carefully the first post of this thread...you dont have to cut any wire, cut carefully with a sharp cutter as to not hurt the wiring 1cm of the insulation on the two pointed wires and bridge them with a 10cm piece of same gauge wire then insulate...if you are not happy with it or if you have an EGT gauge and mr. Dougal is right and the temperature will grow more than normal just remove the bridge, insulate back and that's all

dont forget, if you do that LEAVE THE MAF UNPLUGGED

Originally Posted by clubagreenie

Seriously?

1. There's a big table comparing temps, air mass, ambient pressure & temps etc etc.

This is used to calculate fuel delivery.

Fuel make the engine turn.

2. Screw with what calculates the fuel/air ratio by screwing with "only" the black box...

3. Question. If the MAF is so unessential why is replacement one of the first suggestions AND fixes when they run like crap.

All bad running is caused by EGR issues.

4 Remind me to remove the EGR on my V8 and the MAF issues will go away.

Got a solution for 38L/100 economy when EVERY sensor and ECU have been replaced and the engine overhauled and stripped back down to check cam timing etc?

so:

1. completely agree with those statements

2. from my point of view i'm not screwing with what calculates the fuel/air ratio cos i'm not screwing with the MAP sensor, cos according to the simplified but as already admitted correct RAVE this one's signal is used by the Td5 ECM for engine management...i'm quoting it for the third time so you dont contradict me on this you contradict the book:
"The ECM uses the signal from the MAP/IAT sensor for the following
functions:
l To calculate the delivered fuel limits.
l To calculate the air mass in the cylinder.
l To calculate the air speed density.
l To calculate air temperature."

3. did you expect a manufacturer to admit it's useless as long as they dont recommend to get rid of the EGR neither... and as long as the EGR is on off course that the MAF which is there for it's management must be changed if it's faulty... read some builders theories about de-EGR-ing and you'll think that your engine fill fall apart in no time if you get rid of the EGR....i have more than 150000 km without EGR and no problems with the engine

4. i'm not gonna say anybody to get rid of the MAF nor on a V8 nor on a Td4 nor any other car for which the MAF is important according to the official data, cos yes, that blamed RAVE which seems that it's contested only for Td5 inforces the theory about MAF's importance where it's the case, cos for V8 the contested book sais:
....(the MAF signal) supplied to the ECM as a voltage between 0 and 5V, where it is processed by the ECM's internal mapping to interpret
the data as a measure of the mass of air flow.
The measured air mass flow is used by the ECM to determine the fuel quantity to be injected in order to maintain the
stoiciometric air:fuel mixture for optimum engine performance and low emissions.
and as i believe the book in all it's chapters i couldnt mess with such thing off course

why is so unbeliavable for some of you guys that for the Td5 the MAP do this job... i'm not gonna dig after other types of engine managements but i know from memory that on majority of systems i saw(not many though) where the MAF is used in this fueling/injection management it's combined with the IAT, so is on V8 and Td4, both have MAF/IAT but the Td5 has MAP/IAT and it's also clearely stated like for the other's MAF that the MAP signal is used for air mass calculations... imo all these things have some logic though.