A Bosch MAF was bought on Ebay for $63 including tax and will here next Tuesday. Meanwhile, a Smoke test was done this morning and a small tiny smoke came out from the line connection to the intake manifold adjacent to the PVC nipple connection to the intake manifold. I tried to down load a photo but dont know how to yet.
The question is --is this enough to trigger the MAF code? The MAF code kept throwing itself out. My idle control valve is no longer there. I am thinking maybe it has always been this MAF code that caused the IACV all this time? I wonder what the name of this plastic tubing is so I can get a replacement

 

 

That's a vacuum line. I believe it goes to the brake booster. It's not your IACV.
The IACV is one of the units bolted to the intake plenum over near the brake booster unit.

 

duplicated...

 

TReK,
Any leaks in any engine-vacuum line would affect the balance of air/mixture flow into the engine because air from outside is being sucked into the engine through the loose grommet which holds the vacuum line in place at the intake manifold. The smoke test confirmed this vacuum leak. This inbalance of air/fuel mixture flow into the engine is picked up by the ECU which causes the Idle air control valve to adjust. The ECU will also feed the info to the MAF. When the IACV cannot keep up with the inbalance of fuel mixture (too much air versus fuel because air is being sucked in through the loose grommet), the ECU threw codes of MAF and IACV. Of course you already know that, right? ...It is not always easy for anyone to detect where the vacuum leak is, but I did it with a home made smoke machine.

I have tried to fix the issue with my other OEM IACVs (which were cleaned and tested) and with my four other good used Bosch MAFs, but no success during the last two weeks. I recently bought one new Bosch MAF a couple of days ago for $63 from Ebay and it is coming. I am very glad to have found the vacuum leak a couple of days ago which I now strongly believe it is the culprit that caused the problem. I now dont think the MAF or IACV are the problems. Likely I will return the MAF.

In case you have not experienced with this similar issue, I strongly believe the air sucking vacuum via the loose grommet (on the intake manifold) can really mess up the correct intake air/fuel mixture flow into the engine and triggers a myriad of engine codes, mainly MAF and IACV codes. Today I got sick and could not go to a wrecking yard to pull off a grommet off of another D2. I cannot believe it costs as much as $80 for a rubber grommet at a Landrover dealership)

This is the time I really miss having DIscoMike around. He was from the other Landrover forum. He was a retired factory trained LandRover mechanic and service manager who advised many forum members with practical advices. Mike passed several years ago; but he is still missed by many members who kept on asking for his whereabout, not knowing that he had passed.