What is your car? Diesel?

 

Everyone thinks we're psychic.

 

sorry 2.0d, just checked again, 116 kpa with engine not running, 120 kpa at idle, or 34.6 inhg

 

so what is your car...have you helped us to help as asked by updating your profile, or do we have to read back through your posts to help???

 

Given the forum, I'd guess X-type.

 

x type 2.0d 2005

 

Is your MAP sensor located in the middle of the EGR pipe run from the intercooler to the EGR? Or, in simpler terms, is it way down between the engine and radiator on the left hand side when standing in front of the car and a bu88er to get to?

 

yes below egr valve, on other end of big pipe, to map then pipe to intercooler, no holes or splits in hose's

 

OK. It is not uncommon for the wiring going into the MAF plug to corrode giving intermittent connections and fault codes. I had this.

The MAF wiring goes into the big thick wiring loom adjacent to it. From there, inside the loom, it runs up towards the top of the engine.

What I did was to open up the loom on top of the engine (or rather near to the EGR) and identify the MAF wires. Amongst the colours will be two identical wires, white with green stripe. One is the MAF signal,the other is a temperature signal. After identifying and marking, I cut the wires going into the MAF plug, leaving length from the plug to make fresh connections. The wires were pulled up through the loom. From here I could see the corrosion. I cut out the corroded section and made a fresh loom to the plug - soldered and heat shrink sleeved connections, and the 4 wires then inside a fresh sleeve.

So, instead of the MAF wires entering the loom down low, they now run up near to the EGR and enter the main loom there. In future, I can simply detach the EGR pipe run at the intercooler and EGR ends and lift the pipe run out. The MAF loom will slacken as you lift out, and you can then easily detach the MAF plug. This is a vast improvement from trying to detach the MAF plug in situ with minimal access.

 

MAF MAF MAF stupid autocorrect ...

MAP MAP MAP stupid autocorrect...

 

accepted - its late and i'm tired.

 

thanks for the help so far, as any one got a 2.0d x type and a code reader with live data on it, could they plug it in and give me the readings of the map sensor, reading with engine off and one with engine at idle / tick over, thanks/

 

been reading a bit more about atmospheric pressure
Average sea-level pressure is 101.325 kPa or 29.92 inches (inHg) am pretty close to sea level and getting 116 kpa or 34 inhg to high

 

I don't know if this helps but I just found this on a Transit website - I guess the theory is the same (what complicates this is that apparently the f-super shows readings out by a factor of 10...

With f-super, some key bit of information:-

1. BARO is air pressure, and is out by a factor of 10. So 100 is roughly 1000mb. (MAP sensor). Should be roughtly 99-101 depending on the weather and altitude. Note on images mine is 88 - thats because I was up in the Alps!
2. MAP is manifold absolute pressure, and is in effect boost pressure. It is in effect a factor of 100 out! (see MAP sensor). On idle, it should match BARO (x10), and on revving to 2-3000 revs should read up to 14. (Boost pressure in PSI = (( 10xMAP ) - BARO ) x 0.145. So, if BARO = 100, and MAP = 14, then PSI = ( (10 x 14) -100 ) x 0.145 = (140 - 100) x 0.145 = 40 x 0.145 = 5.8 psi boost

Ford Transit TDCi, low power, low boost (p0235) - Fixed!

Jim

 

looks good, think mine is over reading giving over boost, reading high so injecting more fuel ? when it shouldn't hence the black smoke

 

any body know the difference between 4s7q-9f479-aa and 1c1a-9f479-aa, both are listed for x type and mondeo tdci

 

just checked my mates map sensor readings on a 55 mondeo tdci, 101 kpa engine stopped and at idle, revved up hard would only go to 160 kpa, mine is 116 kpa at engine stopped, 120 kpa at idle , revved hard saw 240 kpa, have ordered a new ford map sensor hope it sorts it out.

 

just put in brand new ford map sensor, and the readings are the same 116 kpa with engine off, should be 101 kpa sea level, so no change, can or will the mongoose software recalibrate them ?

 

can or will the mongoose software recalibrate them