well, i finally got back to the dyno, but now im missfiring.
what are the general guidelines to fixing missfireing.
ive searched and people say check the gap in spark plugs, but
they are all at .032.

new distributeR? msd??

 

Try a closer plug gap. At 13psi I would run a .028-.030 gap on ngk 3330 plugs.

 

i was advised to get new igniter in distributer, and just a cheap type msd 6a

thoughts?

 

my 6al just kicked the bucket after 8 years

i got my digital 6 plus coming in, sports 35 more millijoules per spark over the analog 6 series, plus the digial has rotary dial soft rev limits and start retard and single stage retard etc....

 

Plug gap seems fine. The ignitor is okay in the dist. it either works or it doesn't I would suggest to just get a MSD 6A and you should be fine.

 

try smaller gap and make sure your engine has a good ground

 

Stock B series ignitions can hold 400+whp with zero problems.

I have an idea... regap them to a smaller plug gap and see if that helps.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">Stock B series ignitions can hold 400+whp with zero problems.

I have an idea... regap them to a smaller plug gap and see if that helps.</TD></TR></TABLE>


i have even got a stock H series ignition to hold 400whp with a .028 gap but not my car

 

well, at first, when i first got on dyno tuning at 7 psi, it was fine, no misses and gaps in curve, then when we turned it to 13 psi, thats when it began. ill post dyno sheet tonight to show yall the big gap that showed up in my dyno curve.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DLB1994 &raquo;</TD></TR><TR><TD CLASS="quote">
i have even got a stock H series ignition to hold 400whp with a .028 gap but not my car</TD></TR></TABLE>

I've seen another guy pull 400whp on a stock h22a ignition... his dyno chart looked like **** too with a huge peak followed by a valley followed by another peak and a valley and do that about 5 more times.. Crazy amount of misfire up top... it was posted here in the FI forum a few months ago.

Back to the B series guy, go set your plug gap to .028. It takes 5 minutes opposed to purchasing this and that then installing it. I know what I am talking about.

 

here you go




see that big nasty gap? its not a printer error, the dyno wasnt reading anything. at first it was all good, then after a couple of 13psi pulls and missing and then power just kept dropping after each additional pull.

 

I've seen much worse misfires before. Gap them to .028 and take it for a test drive.

also... are you running the 3bar map sensor?

 

just in case you wanted to see

old dyno