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Morris
Yoda
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This is an update to my Blew another head gasket thread.
I pulled the head and measured my compression ration. I am around 10.1:1-10.3-1. That's a little higher than I set out to create when I decked the head, but not extreme enough for me to worry too much about it. I cleaned my combustion chambers (I think that probably dropped my compression ratio .2-.3. They were pretty coked up!), cleaned my valves and lapped them. Put it all back together, and it fired right up...
But it is still running poorly with a wildly fluctuating manifold vacuum. It runs waaay lean at idle or cruise, but runs great under acceleration with an appropriate AFR. (I have a wide band 02 sensor). These are the symptoms that lead me to pull the head in the first place.
In the process of diagnosing the blown head gasket, I checked compression, pulled the exhaust (to check for exhaust obstruction), and ran a leak down test. None of those tests gave any clues as to the problem I am having... except for the leak down test which identified a leak between 1 and 2.
I am at a loss as to what to check next. Any ideas or advice will be greatly appreciated.
I pulled the head and measured my compression ration. I am around 10.1:1-10.3-1. That's a little higher than I set out to create when I decked the head, but not extreme enough for me to worry too much about it. I cleaned my combustion chambers (I think that probably dropped my compression ratio .2-.3. They were pretty coked up!), cleaned my valves and lapped them. Put it all back together, and it fired right up...
But it is still running poorly with a wildly fluctuating manifold vacuum. It runs waaay lean at idle or cruise, but runs great under acceleration with an appropriate AFR. (I have a wide band 02 sensor). These are the symptoms that lead me to pull the head in the first place.
In the process of diagnosing the blown head gasket, I checked compression, pulled the exhaust (to check for exhaust obstruction), and ran a leak down test. None of those tests gave any clues as to the problem I am having... except for the leak down test which identified a leak between 1 and 2.
I am at a loss as to what to check next. Any ideas or advice will be greatly appreciated.
