I have been struggling to make my A4 reliable. The tow guys are getting to know me on a first name basis. Since I purchased my boat last fall I have been suffering from random engine failure and some excessive smoke when it has been running for a while. I have been reading this form religiously for months trying to diagnose my (I mean my engines) problem. I have been tearing things apart one by one and have found things wrong each time. Water in the fuel, emptied the water separator. Moisture in the distributor, new cap and rotor. Carburetor, cleaned and rebuilt. Fuel tank, cleaned that out and got the piece of tape floating around the pickup tube out. Coil getting too hot, replaced that. New plugs. New fuel lines and polishing filter.
The problem happens after the engine has run for a half hour or so and then it sputters out and dies. The compression is good on all cylinders and the plugs all look the same a little soot but nothing excessive. I looked into exhaust back pressure and thought well I haven't looked into that yet.
Now I have opened up a can of worms and I guess I should go fishing. I checked the exhaust hose after the riser and found the hose to be in great shape. I did find some crud in the water mixing riser thing and attempted to take it off as to no avail. So I tried to pull off the manifold which I can not get off all the way due to the riser hitting some framing member and now will go back with a hack saw to finish the job and get things all cleaned up.
Sorry for the rambling, venting a bit. Here is the question. Once I get the manifold off I figured I might as well check into the valve adjustments. Could poorly gaped valves cause the engine to die once it comes up to operating temperature? Or am I just chasing ghosts. What all could cause an engine that fires right up when cold and runs like a champ to die once it warms up.
One more thing does anyone know anything about this? I don't have space for a lift muffler or a standpipe and don't know if this is replaceable.
Thanks everyone
Chad
The problem happens after the engine has run for a half hour or so and then it sputters out and dies. The compression is good on all cylinders and the plugs all look the same a little soot but nothing excessive. I looked into exhaust back pressure and thought well I haven't looked into that yet.
Now I have opened up a can of worms and I guess I should go fishing. I checked the exhaust hose after the riser and found the hose to be in great shape. I did find some crud in the water mixing riser thing and attempted to take it off as to no avail. So I tried to pull off the manifold which I can not get off all the way due to the riser hitting some framing member and now will go back with a hack saw to finish the job and get things all cleaned up.
Sorry for the rambling, venting a bit. Here is the question. Once I get the manifold off I figured I might as well check into the valve adjustments. Could poorly gaped valves cause the engine to die once it comes up to operating temperature? Or am I just chasing ghosts. What all could cause an engine that fires right up when cold and runs like a champ to die once it warms up.
One more thing does anyone know anything about this? I don't have space for a lift muffler or a standpipe and don't know if this is replaceable.
Thanks everyone
Chad
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