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Re: Re: What makes a gas engine run rich
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Posted by Gene on March 02, 2001 at 21:52:45 from (205.188.200.156):
In Reply to: Re: What makes a gas engine run rich posted by dick on March 02, 2001 at 18:58:59:
I certainly appreciate the feedback. Your list of possibilities sparked a few new ideas. Here is a list of what I have done so far.
-Had carb overhauled and flow tested twice.
-Checked the float level in carb with external hose while tractor was running. Found to be OK.
-Changed out the fuel pump and checked fuel pressure.
-Put in hotter plugs. Running D21's currently.
-Replaced the coil, condenser, points, distributor cap, plug wires, and coil wire.
-Set the timing and checked centrifugal advance.
-Ran carb without air intake hooked up and also checked air intake and filter replaced.
-Went from unleaded regular fuel to super premium unleaded fuel.
-Cleaned fuel line, filter and bowl.
-Disconnected and blew out fuel line with compressed air.
-Checked compression on engine. Found to average about 160 + or - about 8 lbs.
-Put in a lead additive to a tank of fuel and tried that.
May have forgotten some items. If it is of any help, the tractor runs richest at slow idle, and will almost choke you with fumes from unburned gas. When the tractor is run hard with a load, it seems to do better. Has plenty power and doesn't miss. But, when plugs start to foul out, the miss returns. Solution, pull the plugs, sandblast them or replace them, and problem goes away for a little while. But, I haven't really checked to see how "strong" the spark is, and the intake manifold could be a problem I guess. I have sprayed around the manifold with WD-40 to see if I could detect any change in engine sound, but nothing happened. Again, thanks for the list you provided me. Any thoughts are appreciated.
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