ScottinSSMd

Drilling the hole is pointless. I did it a couple of months ago and today, I officially have a constant shutter now. P0305 misfire #5. Mechanic is reading up on the TSB's I have fed him this afternoon. ALong with an SCT flasher and custom tunes, we plan to wipe this issue once and for all so I can get back to enjoying the ride again.

NASSTY

That sounds more like a spark plug/coil issue than a intercooler/condensation issue.

engineermike

What he said. If its constant then its not condensate related. Probably a bad plug. I had a misfire that got worse and worse over time. Regapping the plugs made it go away completely.

brucesears

What Mike said, you have a bad plug or coil. Or maybe more than one. Until you get that fixed the tune will only make it worse.

ScottinSSMd

Yeah, heading out for new plugs this morning. Then I'll do a coil test if its still occurring.

jayandsam09

Have you ever had the total loss of power? Of just the shudder?

engineermike

You absolutely MUST gap the new plugs or replacing them will be fruitless. Gap the new ones at .030". Let us know what gap the old ones had.

brucesears

I would say 'maximum' gap at .030. Many of us with tuned trucks are at
.028 and some (myself included) are even running them at .025. Best gap with the SSI tunes seems to vary with each individual truck.

ScottinSSMd

Plugs cleaned up my issue. Of course I gapped them. .030 per my tuner for my other vehicles. Factory plugs came out at .044-.046 WTF?

NGK TR6 plugs. $15.

Never stalled out, just shuddered reeel bad.

911/996

You don't really have to reach the point of "stalling out" in order for short term/brief but multiple instances of intake condensate to damage the individual coils, plugs, and or the catalyst.

Ingestion of water droplets will ALWAYS raise the effective compression ratio as the droplets vaporize and break down into the components parts, hydrogen and oxygen. Quite possibly well above the point wherein the coil's HV can jump the spark plug gap.

Which is why narrowing the gap sometimes helps but is NOT the proper fix....

Over time the resultant sparking inside the COP will form a permanent path/track and the COP, if not the plug itself, will fail.

Pure oxygen, unburned oxygen, reaching the catalyst will soon compromise it's functionality.