Hi, All:
I've searched the forums and haven't been able to find a solution to my problem - hoping for some insight.
I purchased an RV-7A about a year ago. O360 with dual Lightspeed ignition. Normally it starts up and runs beautifully, and if it does it runs like a top for the duration of the flight.
Occasionally it starts rough, and CHT on #1 doesn't come up, so appears to be that cylinder. If I do a hot start procedure to clear the cylinders and let it sit for a minute, it will usually start up w/o problems. If it starts rough, it never switches to clean. If it's running rough, isolating the 'mags' (it's Lightspeed electronic ignition) has zero effect on how it runs, so I don't think it can be a bad coil.
During the hot months here in Texas (500' MSL), if I go full power with full mixture on the initial takeoff roll, then it can switch from clean to rough but never on touch and go's. Last weekend I forgot to enrich the mixture before doing a runup, and it switched to rough. Again, if it's rough, I have to do a shutdown and wait a bit to restart for it to start clean.
I've replaced the spark plug wires, the plugs, and intake hoses. The builder completed the plane in about 2010, and it has 400 hours since then. He said it did do this occasionally before I purchased it (I knew this was an issue when I bought it).
It's only sometimes a problem, and so far it's never switched to rough running when I'm in the air, but that of course is my worry.
Best regards,
I've searched the forums and haven't been able to find a solution to my problem - hoping for some insight.
I purchased an RV-7A about a year ago. O360 with dual Lightspeed ignition. Normally it starts up and runs beautifully, and if it does it runs like a top for the duration of the flight.
Occasionally it starts rough, and CHT on #1 doesn't come up, so appears to be that cylinder. If I do a hot start procedure to clear the cylinders and let it sit for a minute, it will usually start up w/o problems. If it starts rough, it never switches to clean. If it's running rough, isolating the 'mags' (it's Lightspeed electronic ignition) has zero effect on how it runs, so I don't think it can be a bad coil.
During the hot months here in Texas (500' MSL), if I go full power with full mixture on the initial takeoff roll, then it can switch from clean to rough but never on touch and go's. Last weekend I forgot to enrich the mixture before doing a runup, and it switched to rough. Again, if it's rough, I have to do a shutdown and wait a bit to restart for it to start clean.
I've replaced the spark plug wires, the plugs, and intake hoses. The builder completed the plane in about 2010, and it has 400 hours since then. He said it did do this occasionally before I purchased it (I knew this was an issue when I bought it).
It's only sometimes a problem, and so far it's never switched to rough running when I'm in the air, but that of course is my worry.
Best regards,