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Originally Posted by edwardmk
This prompted me to follow all of Steve's links to his historic posts on this  . I added my thanks and then got stuck in. Someone had already done the drain tube mods. There was a good amount of leaf and mud debris present. The drain tube lumens were open but narrowed to the point that a winter deluge might indeed have filled the plenum chamber and damaged the ecu. The pollen filter looked pretty good, but I vacuumed out all the loose debris on the intake side anyway. For good measure, I also very carefully disconnected and re-connected the ecu. My thinking was to refresh any contacts that might be oxidised. I pulled out the small drain tube and cleaned up and replaced it. I left the one at the bottom of the plenum but cleaned it out with a (very)long screw driver.
I didn't manage to do the spy hole mod. When I get a suitable moment that will be followed up. I just need to find some aquarium foam now. Luckily we have no overhanging foliage here dropping leaves etc, but I could see that you'd only have to park once under the wrong tree in the autumn for it to be an expensive mistake!
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Then I had a sudden doubt. Should I have disconnected the battery before disconnecting the ecu ? Fortunately she fired up first time, so I guess I got away with it
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Hi Martin.
No need to have a doubt or worry, i have unplugged quite a few ECM/ECU without disconnecting the battery, what is important is it's always best to maybe do it after the ignition has been turned off for at least 30 minutes or more, that way most items will be asleep
any garden centre with a fish part added to it will sell the aquarium foam.
You can even get it online
https://www.ebay.co.uk/itm/133514651...r=432974251048