Question about 1999 Dodge Ram

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I have a 2001 Dodge Ram 1500 5.2L, 197000km/120000miles. The cat was plugged up with no engine power. It occasionally smoked upon ignition. It occasionally smoked out an oily soot from the exhaust. The cat was replaced with a new one. Idled roughly. Engine chugged at lower vehicle and engine speeds. Engine light came on solid. At 120km/hr, 70mph the engine light started flashing, also at high rpms low speed. Engine codes are P0300, P0303, P0306. Oil at air filter, replaced. Plugs were all changed. Ran smoothly for short time, then roughened up again and smoked throughout. Oil was changed. Oily soot still from exhaust. Used 1 bottle engine flush revive. Ran through. Ran though 1 bottle of fuel system cleaner. Going to check plugs again, compression, and fuel system presser. Do I have a leaky valve or bad ring?

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  • s_warriner May 19, 2009

    I checked the compression. 140-150psi throughout except #8 only had 75psi, #6 had 0psi, didn't even move the needle. Double checked the guage on a previously checked cylinder to make sure it didn't get bumped.. #8 spark plug had carbon deposits on it, #6 had oily soot on it. All plugs replace just last week. I heard that the gasket under the plenum was known to have problems with the paper getting sucked in, and that replacing with the metal one would solve it if that was the problem.

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The plenum problem should not affect compression tests. It allows oil to get sucked into the intake and will cause carbon buildup, plug fouling, and pinging. If you have zero compression on a cylinder, it is usually a valve problem. Even a burned piston will make some compression, unless it has a big hole in the middle.
Sorry, but if your compression results are to be trusted (and it seems they are), then you have to tear a head off to find the problem, or at least get a borescope in it.

Posted on May 20, 2009

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