BeemerBob wrote:My '06 patrol was crapping out after the engine got hot at high altitudes.
The right cylinder would backfire, fart and sputter until the engine died. After cool down, I could go again.
BeemerBob wrote:Got the ol' girl home and did a compression test.
Left cyclinder = 72 psi
right cyclinder = 110 psi
URAL CT wrote:Hey Bob,
Do the easy checks first, like what rugaroo said. Just because you gapped the valves doesn't mean there is not a problem with 'em. Had a small metal chip lodge onto one of the valves of my 72 Beemer, same symptoms. If you pull the heads out do the leak test on it. Pull side that's showing a defect first. Also I'm concerned about the piston not matching the original letter stamp. Dunno if that has any bearing on the issue. I've always replaced pistons with the same size designation. Or I have the cylinder machined to fit the piston per spec. Dunno!
Call me if you have any questions. Good luck, bud.
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