pop pop pop, what the heck happend? Help..

I am noit sure what happend. Everything was going great, the car was running and driving good then all of a sudden it started running crappy. At idle it pops in the driver side bank of carbs but when I rev on it it pops and backfires on both sides. If you really get into it it runs ok but at lower rpms it pretty much sucks. This was an all of a sudden thing. Any ideas? Suggestions? Someone want a set of 40`s? If this is obvious Im sorry, I came from a 87 carrera and know squat about carbs...

Tom
73T (maybe not for long

It sounds like your points closed up. Have the dwell checked. If you still have points, I would change to a point-less set-up.

Good Luck,
Lee

If you don't already have one, get a Haynes manual, and a new set of BOSCH points (assuming it's a BOSCH distributor) and read up on changing and setting points with feeler gauges, forget the dwell reading! Mark the base of the distributor and block with paint or fingernail polish, then rotate engine to the firing point for cyl. 1. Mark Cyl. 1 position on distributor, where cap fits clearly! Remove distributor, leave cap and ignition wires in place. Change points, and set gap. Clean area around dist. base on block, and clean distributor, oil area around O-ring seal. Rotate rotor to cyl. 1 position, and replace distributor into engine block, making sure marks line up precisely! Replace cap and CDI ignition lead. Start engine and set timing at idle to specs with timing lamp. After engine has warmed up, check maximum advance at 6000 rpm, very briefly at high revs! Drive and enjoy ...

Note: the point-triggered BOSCH CDI has very long point life, but does need to have them replaced every 3-5 years, in my experience, and, along with changing spark plugs and oil, and adjusting valves, are basic tasks MOST 911 owners should be able to perform without fear! The basic skills are identical for working on your own VW beetle, without exception, and the Porsche owner's manual gives you the proper specs. The Haynes manual has plenty of pictures, but not all are correct for any one particular vehicle! So, be careful!!! Good Luck!

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Warren Hall
1973 911S Targa

I have no feeler gauges or anything but I went out and made a small adjustment and it seemed to make a diff. i will pick up a new one and a feeler gauge and fix it right. Thanks for the info you guys are life savers...

Tom
73T (maybe a keeper )