D2 MAF sensor-cross reference

L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Hi Everyone,

Just letting you know I haven't fogotten about you :)

In short, I am now corresponding with Pierburg Germany instead of their Sydney branch. I am awaiting an answer from Germany to see if their MAF Sensor has an in-built temp sensor. Whether it corresponds to the Bosch resistance curve is a different story...so:

I did about 4 hours research once again doing cross-referencing etc etc and I have found a Intake Air Temperature (IAT) sensor that can be used in conjunction with the Pierburg MAF (if the Pierbug MAF sensor's temp curve is wrong or it doesn't come with one).

The details of the Bosch units to get (in order of priority) are:

Best: 0 280 130 085 (quickest temp responce and most accurate)
Second Choice: 0 280 130 039 (slowest temp responce but OK and not as accurate)

When I talk about accuracy, I am talking about how well it's matched to the original Bosch MAF unit that goes into the D2's.

If you want to ahve a look at the specs of these babies:

http://apps.bosch.com.au/motorsport/downloads/sensors_temperature.pdf

I'm ordering a Pierbug MAF sensor tomorrow (7.22684.07.0) and will prob. be ordering a 0 280 130 085 and then doing a mod to my MAF housing an then splicing the 0 280 130 085 into the harness.

The benefit to this is:

1) If your MAF sensor bums out, you don't need to replace the temp sensor.
2) Also applies the other way around :)

If anyone can source the best price for these units then we can have the best solution for the best price too.

Cheers

Erron
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Hi Everyone,

I'm just letting everyone know that I'm very very happy with my disco at the moment :)

I have power I haven't experienced before, smoothness I haven't experienced before, better acceleration response, better gear changes and I now have a system whereby I have a modular Pierburg/Bosch solution that apparently lasts longer (so I have read).

Here's the info to fix your D2 MAF (ie rough idling and loss in fuel economy):

1) Purchase a Pierburg MAF Sensor. Part Number: 7.22684.07.0
2) Purchase a Bosch Intake Air Temperature Sensor (IAT). Part Number 0 280 130 085. This uses the same thermistor as the original Bosch MAF sensor.
3) Purchase a connector for the Bosch IAT. In Australia; ACA Part Number: BK402, Bosch Part Number 1 237 000 036 (I purchased an ACA connector).
4) Remove the existing Bosch MAF Sensor, take you anger out on it and then throw it in the bin. You will need a hollow security torx bit for the screws.
5) Mount the Bosch IAT Sensor into the MAF housing. Details:

i) Relative to the centre of the original sensor, you need to be at least 60 degrees away due to a ridge on the Pierburg MAF Sensor. Mark a line that is in parallel with the airflow. I mounted the IAT so it sits pretty well vertial in the MAF housing after it's all put back together. Don't mount it too far so the IAT connector wires don't reach the original MAF harness.

ii) With a small drill bit come in 4mm from the ridge closest to the engine and make a mark with it by spinning it in your hand. Info:

....................drill bit
......................|
......................|
Engine _____| |_______________________| |_____Air Cleaner

..................>| |<
...................4mm

Ignore the dots as I needed to use these to line everything up.

iii) Mark another hole, 15mm from the first hole and closer to the Air Cleaner (this is for the securing screw)

iv) Drill a SMALL hole at both points (about 1.5mm)

v) With a small cone shaped grinder on a drill, remove part of the ridge near the small hole closest to the ridge (as indicated above). You want to drill a hole slightly larger that the diameter of the IAT and you need to get rid of most of this ridge so that your original centre point doesn't move. The diameter of the IAT is 12.5mm, so you probably want to drill a 10-12mm hole.

vi) Drill a hole so it PARTLY goes into the ridge.

vii) Use a round file and file the hole out so the IAT fits TIGHTLY into the hole. Be VERY careful here as a couple of quick agressive files and you can get rid of a lot of plastic and stuff up your MAF housing. I left about 1mm of the ridge in place for support when the IAT was screwed in place.

viii) Find three washers (or one) that is the height of the ridge (about 3-4mm).

ix) Fit the IAT into the MAF housing and use a screw with a wide spiral (for plastic) and secure the IAT in place.

6) Use the same cone shaped grinder (or file) and shave off the outside square edge of the Pierbug sensor as this needs to be round like the Bosch sensor. After you're ground off the edge, check to make sure it fits with the MAF harness connector going to the ECU.

7) Screw the Pierburb sensor into the MAF housing and take note of the arrows indicating the flow of air (look from the top as they are there). Make sure they are in the same direction as the MAF housing arrows.

8) Wire the IAT connector that you purchased in item 3) above. Details:

i) Cut the wire on the original MAF harness that goes to pin 1 (mine was green) as close as you want to the actual connector. Remove around 10mm of the plastic.

ii) Cut 10mm from the red wire on the IAT connector (from 3 above), twist this together with the wire you just cut and then solder it and tape it up.

iii) Get a razor blade or equivalent and cut a 10mm gap into the wire connected to pin 3. Cut it at around 30mm from the connector. Be VERY CAREFUL not to cut all or any of the wires. You need to remove all the plastic in a 10mm area. Once you have done this, twist the black wire from the IAT connector onto this and then solder it and then tape it.

Plug your newly spliced IAT connector onto your new IAT sensor and the original MAF connector onto the Pierburg sensor and you have a brand new hybrid system that kicks ass.

Total cost to me, including delivery etc: AU$201.26 (US$145)

The last decent milage I got was 635km to the tank (120 litre). I'll let you know if there's any improvement from fitting this system.

I don't think I've forgotten anything.

Cheers

Erron
 
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robertofollia

robertofollia

Well-known member
Aug 3, 2005
555
2
My home is where my Disco is
Erron, this is GREAT!!!!
Thanks for the info. It is the most comprehensive MAF study ever seen!
Then.. according to the data you give it is necessary to drill the hole for the IAT in the sensor housing and not modifying the sensor itself. If you could please post some picture.

So finally the pierburg is a valuable and better alternative to the Bosch unit..

congratulations and regards,
Robert
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Robert,

Yes, a hole needs to be drilled into the MAF housing.

I'll take a photo and post it here over the next week.

From what I read, the Pierburg responds quicker than Bosch MAF sensors and provides a more responsive acceleration. I think I read it in some turbo forum somewhere...can't remember exactly.

Cheers

Erron
 
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robertofollia

robertofollia

Well-known member
Aug 3, 2005
555
2
My home is where my Disco is
Erron, thanks a lot for the pics and the info. This shows that a picture is worth more than a thousand words.

The pics are really valuable, specially the last one, as it shows the exact location of the temp probe from the inside.

Already saved in my computer and diagrams done for the MAF swapping time
Best regards and thank you again for such a valuable post. It has been of great help for me and I'm sure for other members as well
 
scottjal

scottjal

Well-known member
Mar 16, 2006
1,484
0
Nashua, NH
scottjal.ath.cx
What was the cost of the individual parts verses just getting the $125 OEM job? Where could I source these in the US? A web search for that part number didn't turn up much so I guess I would have to find one of their distributors here?
 
robertofollia

robertofollia

Well-known member
Aug 3, 2005
555
2
My home is where my Disco is
scottial,
The MAF sensor is the pierburg for Merc C, E- class and vito, I think. You can get them for about 60 bucks in the US, or in Ebay, and last twice as much. But please note this is the MAF sensor probe only, so you must re-use your housing.

The temp sensor is a bosch part. With the part #s Erron gave, just contact any Bosch retailer who will confirm you supplies, availability and price.

Good luck!
 
Robert Page

Robert Page

Well-known member
Dec 8, 2007
102
0
Avalon Beach, FL
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B

bazzle

Guest
A couple of things
1. Remove the sensor screws with pliers, throw away and replace with standard self tappers.
1. ONLY purchase GENUINE Bosch or Pierburg, be VERY wary os Ebay sensors, lots are copies of Bosch, NOT original Bosch and DONT work !

Adds say "same as Bosch xxx" this means NOT the same part.
weve been bitten here afew times, no more :ack:

Bazzle
 
Robert Page

Robert Page

Well-known member
Dec 8, 2007
102
0
Avalon Beach, FL
I agree, AVOID ebay crap sensors!! In order to retain the warranty on the Cardone 86-10059, order the 5 point sercurity torx from tdiparts.com or roverparts.com and then you can swap a bad sensor back into the VW housing and enforce the warranty. The Cardone MAF has a Bosch Sensor in it without the temp sensor installed. Has anyone found a source for the themistors(?) used as the sensor?

I also cleaned the OE MAF that was covered with red mud water in 100% simple green and an acid brush, and then CRC MAF Cleaner, now working great again. We did 700 miles in the D2 last week to Mountainside Offroad Park and Little River Canyon in north Alabama on the cleaned OE MAF. The "leak" was around the air filter in the air box.
 
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Robert Page

Robert Page

Well-known member
Dec 8, 2007
102
0
Avalon Beach, FL
Continued to get codes P0150 and P0174 after 30 minutes of operation. Passenger side exhaust manifold and down pipe found loose. Replaced down pipe gasket, tightened manifold bolts. No more codes!

Exhaust leaks triggered O2 sensor failure codes. MAF continuing to run well.
 
N

ninjzx998

Well-known member
Mar 24, 2005
114
0
I'd like to know why the vw mafs are so popular for swaps. For my M5 the MAF swap is from a VW as well, M5 has two Mafs aftermarket supplied is around $550 USD each. VW MAFs with same internals can be had for $60. VW. FYI the VW MAFS especially Jetta types are known for their short lifespan some had suggested that reason they were so cheap was they were offered at cost to avoid a potential class action. In any case the price difference warrants using them. My M5 loves them.
 
T

tempestv8

New member
May 22, 2006
4
0
Just a note on the price of the Land Rover Discovery Series II V8 MAF. They used to be AUD$500+ when the vehicle was current, but now the prices have dropped significantly. I just bought one for AUD$320 from my local Land Rover dealer in Melbourne.

I was getting P0171, P1171 and P1174 error codes. Seems like the new MAF has resolved these problems.
 
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