Honda civic carb query
I have an old Honda Civic Shuttle, still giving good service,
including up and down the forest track that accesses my property here. Recently, it has been cutting out intermittently, (can’t find a constant pattern). I keep engine, plugs, ignition all in good state, and the compression on all cylinders is good and equal. I overhauled the head a year ago. Recently, it is occaisonally not easy to start, again no pattern, but gives the typical symptoms of being too rich. Carburettor was of course blown out and is clear of blockages. I suspect it is something to do with a small solenoid valve which is located at theback of the carb, as it seems to duplicate the symptoms if I take the power off this. Does anyone actually know what this device is and what it does? I can see from the circuit diagram it is switched on by the ignition switch, but I can find no other mention of it in my manual. Any suggestions? -- Posted using the http://www.autoforumz.com interface, at author's request Articles individually checked for conformance to usenet standards Topic URL: http://www.autoforumz.com/Honda-civi...ict104472.html Visit Topic URL to contact author (reg. req'd). Report abuse: http://www.autoforumz.com/eform.php?p=484983 |
Re: Honda civic carb query
"cnc" <UseLinkToEmail@AutoForumz.com> wrote in message
news:421af2b4_5@alt.athenanews.com... >I have an old Honda Civic Shuttle, still giving good service, > including up and down the forest track that accesses my property here. > Recently, it has been cutting out intermittently, (can't find a > constant pattern). I keep engine, plugs, ignition all in good state, > and the compression on all cylinders is good and equal. I overhauled > the head a year ago. Recently, it is occaisonally not easy to start, > again no pattern, but gives the typical symptoms of being too rich. > Carburettor was of course blown out and is clear of blockages. I > suspect it is something to do with a small solenoid valve which is > located at theback of the carb, as it seems to duplicate the symptoms > if I take the power off this. Does anyone actually know what this > device is and what it does? > I can see from the circuit diagram it is switched on by the ignition > switch, but I can find no other mention of it in my manual. Any > suggestions? > > -- The device is a cutoff solenoid, added to more recent carburetors to stop run-on. It could be the problem, but I doubt it. My top suspect is the fuel filter, if it hasn't been changed recently. That bit me so many times when I had carbureted cars it isn't funny. Most of them gave trouble in the way you describe - intermittent, no good reason, cutouts. However, they all refused to restart for several minutes to half an hour as the fuel line pressure bled off past the blockage and the debris in the filter could unplaster itself from the screen. It would be good to determine whether the problem is fuel or ignition. I imagine you pump the accelerator instinctively when the engine starts to die, so the float bowl will be empty if the problem is fuel starvation. When it dies, you can remove the air cleaner and look down the carb throat to see if the accelerator pump squirts gas when you open the throttle. In the other direction, if you find the throat already smelling of gas, I've had trouble with the needle valve on one carb intermittently hanging and flooding the engine. I cleaned at it a couple times without success, then got serious and changed the fuel filter, polished the valve needle and seat with a round toothpick, and had no more trouble. Dunno what the actual problem was, but as long as it worked I didn't care. Mike |
Re: Honda civic carb query
"cnc" <UseLinkToEmail@AutoForumz.com> wrote in message
news:421af2b4_5@alt.athenanews.com... >I have an old Honda Civic Shuttle, still giving good service, > including up and down the forest track that accesses my property here. > Recently, it has been cutting out intermittently, (can't find a > constant pattern). I keep engine, plugs, ignition all in good state, > and the compression on all cylinders is good and equal. I overhauled > the head a year ago. Recently, it is occaisonally not easy to start, > again no pattern, but gives the typical symptoms of being too rich. > Carburettor was of course blown out and is clear of blockages. I > suspect it is something to do with a small solenoid valve which is > located at theback of the carb, as it seems to duplicate the symptoms > if I take the power off this. Does anyone actually know what this > device is and what it does? > I can see from the circuit diagram it is switched on by the ignition > switch, but I can find no other mention of it in my manual. Any > suggestions? > > -- The device is a cutoff solenoid, added to more recent carburetors to stop run-on. It could be the problem, but I doubt it. My top suspect is the fuel filter, if it hasn't been changed recently. That bit me so many times when I had carbureted cars it isn't funny. Most of them gave trouble in the way you describe - intermittent, no good reason, cutouts. However, they all refused to restart for several minutes to half an hour as the fuel line pressure bled off past the blockage and the debris in the filter could unplaster itself from the screen. It would be good to determine whether the problem is fuel or ignition. I imagine you pump the accelerator instinctively when the engine starts to die, so the float bowl will be empty if the problem is fuel starvation. When it dies, you can remove the air cleaner and look down the carb throat to see if the accelerator pump squirts gas when you open the throttle. In the other direction, if you find the throat already smelling of gas, I've had trouble with the needle valve on one carb intermittently hanging and flooding the engine. I cleaned at it a couple times without success, then got serious and changed the fuel filter, polished the valve needle and seat with a round toothpick, and had no more trouble. Dunno what the actual problem was, but as long as it worked I didn't care. Mike |
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