I have been experiencing an issue with sensing manifold pressure. RV-8A with IO-360-M1B Lycoming, constant speed prop, Garmin G3X display configured by SteinAir with the appropriate Garmin engine display feed. Airplane has 6.4 hours in flight with about 13 total hours on the engine. Shortly after takeoff and during climb out my manifold pressure stopped indicating. At the time I was trying to set climb throttle/prop setting. I started to return to the field. During return, the manifold pressure indication returned, but stopped a short time later. As you can tell I was able to return safely.
When I removed the cowling, to check on the pressure line from the engine to the sensor and the wiring, all checked out. I turned on the G3X and I had pressure indication. I started the engine and ran through power changes and the indication worked as expected. I replaced the cowling and started the engine to do a taxi test. The indication quit mid taxi and I returned to my hanger.
My next thought was to replace the sensor which I did. I continued to have the same issue; pressure indications with the cowling off and no indications with the cowling on. I am at the end of my thoughts and possible fixes to this problem. I am reaching out to see if anybody has any suggestions as to what to check next. Any suggestions will be greatly appreciated. Would it be worth a call to Lycoming?
When I removed the cowling, to check on the pressure line from the engine to the sensor and the wiring, all checked out. I turned on the G3X and I had pressure indication. I started the engine and ran through power changes and the indication worked as expected. I replaced the cowling and started the engine to do a taxi test. The indication quit mid taxi and I returned to my hanger.
My next thought was to replace the sensor which I did. I continued to have the same issue; pressure indications with the cowling off and no indications with the cowling on. I am at the end of my thoughts and possible fixes to this problem. I am reaching out to see if anybody has any suggestions as to what to check next. Any suggestions will be greatly appreciated. Would it be worth a call to Lycoming?