I added a Procharger D1sc w/twin i/c's. It was running pig rich after Dynotune, and Half way thru the first tank of gas it started missing. Now I have three warm tubes 1,7,2, and five hot.
I've added a Delteq - is it possible I have the coils labeled wrong?, Changed spark plugs, wires otvc's, replaced leaky header gaskets, had pcm programming double checked, changed back to factory injectors on missing cylinders, check valve lift and no bent pushrods, compression 190-210. the plugs spark when engine is cranked. fuel pressure 41, and it holds up for hours after shutdown/no leakage. tried disconnecting maf - no change. Problem is same open loop / closed loop, hard miss all rpm's. 50,000 miles lt1,94z. Check engine light not on. !airpump,!cat, egr diaphram blown and vacuum line disconnected.
I'm out of ideas, any thoughts gentlemen?

 

$50.00 to someone who can put me on the answer. An open loop miss sshould be ezzzz. Spark/valve action/timing/ compression/gas=power.Could my spark timing be goofed up? Any delteq users out there? Could I have mislabeled the coils?

 

burnt plug wires? maybe fouled up a spark plug. just simple stuff just check double check everything

 

I've tried new plugs and wires. Whats strange is when I pull a plug it is black and sooty, the soot is easy to wipe off - not baked/burnt on, like there was no real heat in the cylinder when the plug fired.

 

Pull out all of your plugs and crank the engine over for a fair amount of time to push all of that gas out of the cylinders(Hold throttle wide open). Install fresh plugs and change your oil, since it is most likely saturated with gas. Now try to start the car and see what happens. Hopefully you didn't wash down the cylinders with all that extra fuel(Doubtful). Good luck. Let us know what happens.

 

the coils cant be labeled wrong if only 3 arent running up to par

 

I/m guessing that the three warm cylinders are too rich to burn correctly. Richness would explain missing, soot on plugs, and bad gas mileage 10mpg. I changed two injectors back to stock, but that didn't seem to help.

 

maybe your charger is blowing out the spark? what is your gap on the spark plugs?

 

I am gapped a little wide @ .042.
My miss is at all rpm, including idle, vacuum gauge 18#, where there is no boost. correct?

 

This problem, running rich & missing, started 1/2 tank of gas after I got the car back from dynotuner, who installed 42# lucas green stripe injectors. The car ran fine w/ stock pcm, factory injectors, Prochager.