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abemiami (guest)
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I feel misfiring or rough engine at low rpm, when I go over 1500 rpm it feels normal. When I check compression with all plugs out, Cyl 3 only 25 PSI all other 150PSI, but when I check compression with all other plugs in 1, 2 & 4 and I start the engine with compressor tester on Cyl 3, and I accelerate the car above 1500rpm, cyl 3 gets the 150 PSI as the others. Is this caused by carbón build up or by valves or piston? Thanks in advance.

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This post was auto-generated based upon a question asked on our tech article page here: MINI Cooper R56 Turbocharged Engine Carbon Cleaning (2007-2011) | Pelican Parts DIY Maintenance Article
Old 10-29-2017, 07:19 AM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
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Cyl 3 is faulty. perform a leak down test to find out if it is valve or piston related.

- Nick
Old 10-29-2017, 07:19 AM
  Pelican Parts Technical Article Directory    Reply With Quote #2 (permalink)
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If you need the proper tools to do a leak down test, we have it here: Cylinder Leak-Down Test Kit - PelicanParts.com. Definitely not a bad idea to perform one.
Old 11-15-2017, 09:19 AM
  Pelican Parts Technical Article Directory    Reply With Quote #3 (permalink)
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