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My entire original story is at this thread:
http://www.naxja.org/forum/showthread.php?p=243701807#post243701807
After exhaustive diagnostic work on a PO301 DTC code problem I discovered it had low compression on cylinder #1. In fact it had low compression on 3 of 6 cylinders but only after fixing several other causes of the misfire did I discover this. See the original thread for all the details about worn plugs, shot wires...etc.
So in one last desperate attempt at an easy quick fix before pulling the heads, and possibly worse, I tried some real serious duty snake oil additives.
Specifically I used 1 quart of Marvel Mystery oil, plus a large can of a product called "Restore" added to fresh engine oil, 10W30 Chevron. Then I added 2 crushed dry fiber pellets (light brown) that are additives for radiator leaks, head gasket leaks, etc, plus a bottle of the Prestone medium duty head gasket sealer, the one that is compatible with antifreeze, to the engine coolant bottle, closed system. Then I started the car, and while running the engine I sprayed an entire bottle of carburator cleaner into the intake manifold through a vacuum hose near the throttle body. Then I ran the engine for another 10 minutes at various RPMS, then cleared the old OBD-II misfire code, and guess what?
It has made 4 separate 20-30 minute runs and trips now, about 2 hours net time with no engine service lights, no error codes and all the emissions monitors locked in and working saying this car would pass an emissions inspection again today!
I will post more data periodically on this little snake oil experiment with a massive blend of snake oil products as time passes, including some updated compression tests once I have run them. The number 1 cyl was down to 81 psi before all the additives were added. Although I had high hopes and expectations of some improvement using these additives, I must admit even I was :scared: by the rapid results I got. I was also shocked that the rough idle is nearly gone, in fact I walked away and let it idle for 10 minutes and when I came back I thought the engine had died! I had to check the RPM gauge to confirm the engine was in fact still running, and it was!
http://www.naxja.org/forum/showthread.php?p=243701807#post243701807
After exhaustive diagnostic work on a PO301 DTC code problem I discovered it had low compression on cylinder #1. In fact it had low compression on 3 of 6 cylinders but only after fixing several other causes of the misfire did I discover this. See the original thread for all the details about worn plugs, shot wires...etc.
So in one last desperate attempt at an easy quick fix before pulling the heads, and possibly worse, I tried some real serious duty snake oil additives.
Specifically I used 1 quart of Marvel Mystery oil, plus a large can of a product called "Restore" added to fresh engine oil, 10W30 Chevron. Then I added 2 crushed dry fiber pellets (light brown) that are additives for radiator leaks, head gasket leaks, etc, plus a bottle of the Prestone medium duty head gasket sealer, the one that is compatible with antifreeze, to the engine coolant bottle, closed system. Then I started the car, and while running the engine I sprayed an entire bottle of carburator cleaner into the intake manifold through a vacuum hose near the throttle body. Then I ran the engine for another 10 minutes at various RPMS, then cleared the old OBD-II misfire code, and guess what?
It has made 4 separate 20-30 minute runs and trips now, about 2 hours net time with no engine service lights, no error codes and all the emissions monitors locked in and working saying this car would pass an emissions inspection again today!
I will post more data periodically on this little snake oil experiment with a massive blend of snake oil products as time passes, including some updated compression tests once I have run them. The number 1 cyl was down to 81 psi before all the additives were added. Although I had high hopes and expectations of some improvement using these additives, I must admit even I was :scared: by the rapid results I got. I was also shocked that the rough idle is nearly gone, in fact I walked away and let it idle for 10 minutes and when I came back I thought the engine had died! I had to check the RPM gauge to confirm the engine was in fact still running, and it was!
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