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Agree. No history because I purchased the care in its current condition. I have done a visual inspection of the plugs and they seem good. When revving, there are no obvious misfires, so I'm assuming the coil packs are ok.

Fuel pressure is ok. It stayed around 55 PSI at the fuel rail even when revving the engine. This is my first time to trobule shoot an engine with a super charger. I expect a vacuum leak to be a little different. e.x. a leak between the MAF and the super charger would "suck" in air causing...

Perhaps the "it runs ok above 1500 RPMs" is not really true. Actually it dies if you don't keep the RPMs up, but it has issues at higher RPMs as well, it is not really responsive when pressing on the accelerator, but it catches up and with the higher RPM it does not die. I'm thinking low fuel...

Thank you all for your responses. I agree, the leakdown test is good and I don't think the compression test is the problem. I originally thought that perhaps valve timing was off causing the low compression, but timing marks are spot on. It seems like a large vacuum leak, but a smoke test...

I repeated the cylinder leakdown test with all plugs removed. The result is a consistent 5% on all cylinders. Almost less than the leakdown tester measures.

No. That is an interesting question. I assume you are thinking that maybe there is a head gasket leak between cylinders. Correct?

i need help diagnosing a 2005 C230 Kompressor (M271 Engine) that is hard to start and will not idle. It runs ok with reasonable power when the RPMs are over 1500. It dies if you let it idle when cold. Will idle but very rough when warm. Starting requires a shot or stater fluid spray. It is...

I agree. I have found photos of new pistons for this engine and they look the same. So no evidence of valve-piston contact. So its unknown what is causing the low compression readings. I pulled the valve covers, positioned the crank shaft to cylinder 1 TDC, and observed the cam timing marks...

I removed the valve cover, checked the timing chain which is tight and looks like it has been changed. I used a small inspection camera to examine the piston tops and they have suspicious indentations at areas where the valve might contact the piston. The suspicious area is covered with carbon...

i need help diagnosing a 2005 C230 Kompressor (M271 Engine) that is hard to start and will not idle. It runs smooth with reasonable power when the RPMs are over 1500. It dies if you let it idle when cold. Will idle but very rough when warm. Starts easy after a stater fluid spray. It is...