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Posted by: xperu Nov 25 2010, 12:11 PM

Recently my dual Webber carb'd 914 is popping and back firing during acceleration and letting off the accelerator, they have been on my car for a year or so and I haven’t them and the gas is new and clean. Anyone have any ideas to the solution. Thanks Mike

Posted by: ppetion Nov 25 2010, 12:23 PM

QUOTE(xperu @ Nov 25 2010, 01:11 PM)

Recently my dual Webber carb'd 914 is popping and back firing during acceleration and letting off the accelerator, they have been on my car for a year or so and I haven’t them and the gas is new and clean. Anyone have any ideas to the solution. Thanks Mike

Posted by: NORD Nov 25 2010, 12:36 PM

I use to have popping through the carb and ehaust and found out that the

carb linkage had gotten out of abjustment so one side opened before the

the other and also closed before the other. after setting linkage the

same I now don't get the popping. Might ckeck and see if you have the

same problem with linkage to the carbs.

Posted by: Cap'n Krusty Nov 25 2010, 01:07 PM

Popping through the intakes is a sign of a lean condition, not a rich one. The Cap'n

Posted by: Jake Raby Nov 25 2010, 02:26 PM

Yep, lean causes this.. So will tight intake valves.

Posted by: BarberDave Nov 26 2010, 05:37 AM

Gosh my ans. follows the Capt'n and Jake I feel intimadated ( sp)

but I would pull the idle jets & blow them out. Watch out for the little O-rings.

drop one of those in the engine bay , not fun finding it. My 2 cents!

Dave

Posted by: xperu Nov 26 2010, 10:17 AM

Thanks to all of you for your expertise, I have a few days of so I am going to follow your advice. Thanks Mike and Maria

Posted by: flylarry Nov 30 2010, 12:21 AM

10 years running IDF 44 webers, Lean mis-fire. Check your idle jets and clean-em.

Posted by: flylarry Nov 30 2010, 12:35 AM

Should have qualified that statement:

• good voltage
• good compression
• no vacuum leaks
• properly tuned
  [list]
• then check the idle jets-and don't cut the o-ring!, its will cause a clogged jet.

Posted by: r_towle Nov 30 2010, 04:34 PM

agreed, Idle jets.
You have driven it for a year and you have not found the idle jets yet? you must not drive much...they tend to get clogged up often...just a simple thing to remove, blow out and reinstall.

Rich