M3 not starting, now working - suspicious...

[dan101smith]

My M3 Evo decided it didn't want to start/run last week after sitting outside in the heavy rain. I got it recovered home, left it for a bit to see if it would dry out, but 4 days later still no joy.

I plugged it into a diagnostic reader last night, and it came up with some error codes - air supply meter, control unit power supply and some undefined ones. I cleared those, tried it again, and lo and behold the bloody thing ran perfectly!

Now, call me cynical ("you're cynical") but I find this too easy and too cheap to be a permanent fix. I'll use it as much as possible over the next few days, and read any fault codes again to see if they come back, but anyone got a view on whether I've been very lucky, or whether it's likely to pack up again?

[E30M3SE]

Heavy rain, some water got where it's not supposed to now dried out, Run it and see, I'm sure you know tracing an intermitent fault can be like lookin for a needle in a haystack......... keep your finger crossed.

[dan101smith]

So, this evening's little update:

Went out, tried to start it, the starter turned over but it wouldn't catch. Also couldn't hear the fuel pump prime, but on reflection not 100% sure I ever do...

Anyway, hooked up the laptop again and...it now won't connect to the DDE/DME module, so I can't tell if there are any fault codes (unless it not connecting is a fault in itself? It doesn't seem to be reliable enough software to trust that).

I had a feeling it had been too easy. Any thoughts, chaps?

[teabagger]

water leaking into ecu?