Had some arcing... replaced the wires. Backfire is still there - #6 cylinder it seems. When it pops, too, I can see some smoke drift up from where the egr blockoff plate is, and near the exhaust. Would an exhaust leak cause a backfire? I know the car is running a bit rich as it is...

 

Exhaust leaks will cause backfires and misfires, depending...

 

I would say try adjusting the timing a few degrees, clamp it back down and take if for a drive. See if that changes anything. I know my car would not run great at at 10*, but would run better adjusted some. I see you have adjusted, but maybe you need to set it back or up some.

Second, EGR it can cause a lot of problems, I would really check into that.

Third, your exhaust leak and running rich could be a bad combination get those checked out.

 

I don't have EGR. What I have, is a bad case of working on PMD engines too damn much!

I set the #1 cylinder as the driver's side front. Needless to say, IT'S ALL WRONG. Jesus freaking ..... grrr!!

Tomorrow I'll tear it all apart, and do it the right way - #1 cylinder is the front passanger side, for anyone that wants to know.

 

PMD and Chevy are not the same. All fixed. She's rev-happy again!

 

What does PMD stand for? Never heard that abbreviation before..

 

Pontiac Motor Division.

Basically, the REAL Pontiac motors (pre '81 - or pre '79 for you 301 haters out there )

 

Gotcha... Not too familiar with the old-school stuff....

 

Good to see you figured out your problem. So let me get this straight you were timing your car from your #2 plug, but you thought it was the #1 right.

I can see why your car would problems running.

Anyway great to hear its fixed.

 

check your egr valve. mine had a broken screw and it would backfire between the egr tube and the valve. also saw a puff of smoke when it happened. feel all around the egr, if theres a leak you'll feel air pulsing out.

 

lol, sorry, problem fixed. And... I have no EGR anymore

Yeah, I was timing off #2. Jeebus! Wow she's a rev happy little engine now