Hmmm...trying to decipher your question....gimme a minute ok-




So you got this 4Runner with an engine that was running but poorly? Since acquiring you have done some this and that for repairs and when you went to start it up again the thing backfired and blew the airtube off of the AirFlowMeter?

WOW. How well did it run when acquiring it? Have you had the distributor out of the head by chance? Done anything on the engine itself? Was the clamp on the air intake tube tight so that it couldnt be removed by just pulling on it? The only way for a 22R-E to backfire really is if an intake valve wasnt shutting properly, or not opening properly...and fuel was puddling in the runner. Guess if the timing were grossly off then of course it would backfire if the plug sparked as the intake/injector shot its 1/2 load. Need more info! When starting it with screwdriver wedging AFM open...was the air tube connected at both ends?

Gotta ponder this more, maybe decode some more of your message.

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />