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have a 92 5.0 hundred fifty thousand miles exhaust coming up through the intake just a bad valve or bad rings what's an easy diagnosis
Last edited by Jack Dressler; Jun 10, 2016 at 10:42 PM. Reason: spelling
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Joined: Mar 2015
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From: Merchantville, NJ 08109
If you have exhaust coming up through the intake, it will be a valve issue. It sounds like either the valve is sticking open, or jammed open. Perhaps something got inside the valve cover, and worked its way into the guide. In any case, do a compression check of the engine- preferably a bleed down (Engine static, and you feed line pressure in through a calibrated gauge set) and look for the low cylinder. This will tell you which valve to look at. Additionally, you can pull the valve covers off, and motor the engine, and look for the one which does not fully close, or appears not to move, although the rocker arm moves freely... Most likely you will need to pull the head to repair the valve: It could also be a bent valve stem causing a bind.
Your rings should have nothing to do with this: If they are leaking, the exhaust would be pressurizing the crankcase, and you would see it coming out the oil fill (among other places) if you removed the cap while the engine is running.
Scott
Your rings should have nothing to do with this: If they are leaking, the exhaust would be pressurizing the crankcase, and you would see it coming out the oil fill (among other places) if you removed the cap while the engine is running.
Scott
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You don't want tips from me unless you have a lust for power and have some money you'd like to get rid of....
Not so fast though, check compression and pcv valve first before you jump to the rebuild conclusion, clogged pcv will cause gasses to go back through the intake (oil in intake/airbox) and excessive smoke out of the oil fill.
Not so fast though, check compression and pcv valve first before you jump to the rebuild conclusion, clogged pcv will cause gasses to go back through the intake (oil in intake/airbox) and excessive smoke out of the oil fill.
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Freshman User
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You don't want tips from me unless you have a lust for power and have some money you'd like to get rid of....
Not so fast though, check compression and pcv valve first before you jump to the rebuild conclusion, clogged pcv will cause gasses to go back through the intake (oil in intake/airbox) and excessive smoke out of the oil fill.
Not so fast though, check compression and pcv valve first before you jump to the rebuild conclusion, clogged pcv will cause gasses to go back through the intake (oil in intake/airbox) and excessive smoke out of the oil fill.
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From: Merchantville, NJ 08109
DEFINITELY NOT a valve issue- That would be "blow by": again, do a leakdown type of compression test to find which cylinder it is. This will require at least a partial teardown: If you are going to do it anyway, may as well go whole hog & rebuild the engine.
Scott
Scott
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