OK, just did both hoses by taking the MAF out. It would be crazy to do it any other way!


Taking the MAF out means moving the main two fuel lines, fuel distributor fuel lines, moving the fuel pressure regulator, loosening the band collar at the rubber MAF boot, unplugging the potentiometer, and un-bolting the three 10mm bolts that holds the MAF in place. Takes 15-20 minutes.


Once the MAF is out of the way. It's a clear shot to the tube from the head. 1st unbolt the Cold Start Valve and lift it out of the way. Squeeze the clamp holding the tube while you pull it out of the way with a pick tool. Add some rubber sliding paste and slide the new one back on (I switched to a hose clamp with the adjustment facing up since I found it too difficult to get it back on with the original spring clamp).


The hose from the MAF boot was even easier. I first cleaned as much of the MAF as I could, inside and out. As suggested, this was a good opportunity to inspect and clean all the areas around and below the MAF. I also opened the butterfly on the intake manifold to clean out anything in there. I have a long forceps that was excellent in being able to hold a piece of shop towel to spray and wipe down what I could reach.


For the hose at the MAF, I just pulled it off the old hose, reinserted the collar insert into the new tube and pushed it back in.


Re-installed everything. Easy. 1 hour and Done!

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio