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Exploding intake air box/plenum

2K views 0 replies 1 participant last post by  TonyF 
#1 ·
Hi

My Alfa 155 2.0 8v twinspark burst its intake plenum on startup yesterday. The engine seems to have backfired into the plenum igniting fuel/vapour. Quite a spectacular explosion which blew the top panel out of the plenum.

This has happened on this car before, about 3 years ago. On this ocassion I fitted a new plenum and had the car checked by an Alfa dealer - no cause found.

I'm wondering if the fuel vapour recovery system has failled and allowed fuel vapour into the plenum when the engine is not running, then a backfire into the plenum (why???) and bang.

I haven't found any other instances of this on the forum (either 155, or 145 or 146 which I think use a similar setup).

Anyone else had this problem or can offer any insight as to cause or remedy?

Thanks.

Tony
 
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