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Sorry to bring this up again, but it looks like I'm getting a backfire thru the carb. When I go to start the car, the engine will kick over with a couple of pumps to the accelerator. While the engine is trying to maintain an idle there is "popping" from the engine, not thru the exhaust. My friend confirmed this as he saw a flash come out of the right hand carb when we took the air cooler off and restarted. I have dual 32 PDSIT carbs. After the car is idling, the popping stops and the car runs normally. Any suggestions? Thanks, Bill Kunz 69 SQBK NYC --- Jim Adney <jadney@vwtype3.org> wrote: > On 9 Oct 2003 at 15:20, William Kunz wrote: > > > Can someone give me an overview about why an > engine > > would backfire? My particular instances have been > when > > the car is first started. I have a 69 SQBK dual > carb > > (FI conversion). What might I start to look at? > Also, > > how dangerous is it? > > True backfires (where you get a blast backwards thru > the carb) are rare. You > probably are getting something I don't know a better > name for, which is an > explosion in the exhaust system. The cause is the > accumulation of unburned fuel > in the exhaust, which is then ignited by the hot > gasses when the exhaust valve > opens. You might want to experiment with different > starting techniques, to see > if you can come up with one which gets the engine > started faster, with less > unburned gas passed to the exhaust. Likewise, it > might also be worthwhile to > check the adjustment of your choke, if you have one. > > It's not at all dangerous to you, but it can destroy > a muffler, if that muffler > has already been weakened by rust. > > -- > ******************************* > Jim Adney, jadney@vwtype3.org > Madison, Wisconsin, USA > ******************************* > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | > mailto:gregm@vwtype3.org > __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com