TheSamba.com :: View topic

Sat Jul 05, 2003 4:16 pm

my 69 bus has developed a nasty backfire today.
i took it out earlier to the store and it was running fine, but a little sluggish. when i took it out again later in the afternoon, i had no power, and it was running oftly hot. i checked the dwell, and reset the timing at TDC. when i would rev the engine it would backfire eradically. often shooting out a huge cloud of black smoke. i tried readjusting the timing but the back fire is still there. could this mean there is a stuck valve ot what?

i have had exaust driven back fires before, but they are only on the overrev during down shifting. so this is a new one.

any input is apreciated.

thanks

Mon Jul 07, 2003 8:30 pm

Sometimes loss of power can be a loss of a valve, so do a compression test to check. If thats not it I would suggest running through a tune up, more specifically doing a valve adjustment and checking the spark plugs.

Mon Jul 07, 2003 8:34 pm

Make sure all the plugs are firing, Plug wire loose or off? exhaust leak near the heads?

Tue Jul 08, 2003 6:08 am

Also could be leaky exhaust fittings. However since this happened suddenly, I agree with 71Adventure and Cook91 and would start there. In my case I had the backfiring, then "boom", and next found the #1 plug sitting on the tin. The plug (and part of a helicoil from a prior repair) had blown all the way out. No power and lots of backfiring.