Bad distributor cap = backfire (pics)?

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#1 (permalink)

02-15-2011, 08:13 PM

mbeers6

CC Member

Join Date: Mar 2010

Location: East Bay, CA

Cobra Make, Engine: B&B,351w

Posts: 61

Not Ranked

Bad distributor cap = backfire (pics)?

Hello again fellas, tried searching this subforum, didn't find anything.

So my cobra has begun to backfire out the exhaust under acceleration starting around 3,000 rpms. It runs fine at RPM's below that. It didn't do this before and I've tried jetting changes on my eddy 600cfm with no luck.

I took off the cap and I can't tell if this is the problem or not. The area around the contacts look burnt, but the cap/rotor only have 4k miles on them. The prior owner stated he had a problem with the cap and they (meaning Summit) replaced it free. I wonder if it is a defect.

The distributor is a Petronix flame thrower Vaccum Advance on my 351w.

Your thoughts? New cap/rotor is like $40, so I don't want to replace it if I don't have too. Thanks!!

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