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Well...figured out my rough idle issue. Low compression in #4.
Well, I finally got around to doing some more troubleshooting on my rough idle issue that popped up a while back. Did a compression test...all are 160-165psi.....except #4. It's only 55psi 😕 what's the best way to figure out if it's a ring/piston issue...or possibly a valve/spring issue? The plug for #4 looks pretty dark and sooty.
I guess that either way, the head needs to come off first. Right?
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph  |