is this too lean?

**CHB** · 13-01-2008, 12:29 AM

just fired up my engine again after 5 months of resting it.. after a short drive under boost (10psi).. unscrew the spark plugs and this is what i've found

is this signs of too lean mixtures?

the last time i tuned my MS2 Ver3 was 5 months back and i haven't install the WB02 bung for my LC-1.. any one have ideas?

**thechuckster** · 13-01-2008, 01:04 AM

slightly lean? but were you cruising or giving the engine a lot of load?

http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html

**CHB** · 13-01-2008, 01:11 AM

yeah i revv it hard before it start to missed at 5000RPM. it is 3TC turbo, 20BTDC static ignition timing, Megasquirt 2 Fuel only and SARD RRFPR.

**3BarSuperstar** · 13-01-2008, 08:58 AM

It looks like the plugs aren't that old. Doesn't look that lean. Have you ever had it dynoed?

Your miss fire could be plug gap too big? What's the gap at? If your concerned take it to a dyno and have it checked!

**thechuckster** · 13-01-2008, 12:27 PM

20 degree timing - is that locked or are you running vacuum or mechanical advance on the dizzi?

why no spark control from the MS?

**CHB** · 13-01-2008, 01:02 PM

no advance nor retard.. just fixed at any RPM and boost.

**oldcorollas** · 14-01-2008, 01:53 AM

can you still tell rich/lean from the recent fuels?

did you give it a boot and then cut ignition, coast to stop and take the plugs out? or it was driven home slowly and idled in driveway etc??

**CHB** · 14-01-2008, 09:38 AM

ya it was driven home before the plugs was taken out. if i just give it boost till it missed, then cut the ignition immediately, the turbo still spooling at its fastest speed, will shut the engine off will harm the turbo?

**Draven** · 14-01-2008, 06:57 PM

no need to cut ignition immediately... just stop at the side of the road immiately post WOT and kill ignition... it's hard to tell if you drive home afterwards, because a bity of a drive will clean the plugs, assuming your light throttle tune is in the normal range.