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Post by ronin5573 on Nov 6, 2021 22:32:53 GMT
This is on a 2018 p2008 with a rotax 914. I’m getting erratic oil pressure readings. It goes from 60psi to 150 and off the chart when just blinks red and then backs down to a normal range only to go way up a second later, On the ground it seems to read normal in the 60 psi range. I have replaced the oil pressure sender model number 456180, the crazy reading remain. I have reseated the molex connectors that the sensors plug into which bundle up behind the gear box. I only see one ground wire which bolts to the top of the engine. Was tight and corrosion free. I’ve only had the plane a week so I can’t say if this has been an ok going issue. The engine has 115 hours on it.
The other readings fuel psi oil temp etc read prefect and are stable. It’s just the oil pressure. Anyone with experience with this aircraft have and ideas ?
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Post by LSA Flyer on Nov 6, 2021 23:20:31 GMT
If you have a G3x display, what software version are you running and is the correct sensor selected in setup.
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Post by ronin5573 on Nov 6, 2021 23:50:45 GMT
If you have a G3x display, what software version are you running and is the correct sensor selected in setup. Garmin 8.91. Sensor is Rotax 456180. I was messing around in there and I can’t remember what sensor was selected . It’s the correct one now for sure |
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Post by LSA Flyer on Nov 7, 2021 1:05:20 GMT
Good. If the sender is good and the software is correct then I'd get the multimeter and check the pin connections at the instrument connector: there are 3: 12V+, output and ground. If these are all good its time to put a mechanical gauge in line to see if the spikes are real. That's unlikely, but you certainly want to rule it out. 99% of the time its a bad sensor or connector. If you have high engine vibration that can also cause sensors to fail. Many owners have relocated the oil pressure sensor to the firewall to isolate it. Here is a link: www.leadingedgeairfoils.com/912-914-oil-pressure-sensor-relocation-kit-standard.htmlThere also is a spring and ball bearing pressure relief valve in the engine that could also be checked. The ball has been updated with a $30 mushroom replacement, Rotax part number 857-230, "valve piston". If you have the ball bearing, some owners report replacing it with the new part cured the problem. One other thought: use locktite 648 on the pipe threads, not teflon tape, the sender needs to ground to the engine case. Don't over tighten. |
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Post by grantopperman on Nov 7, 2021 13:49:48 GMT
E-LSA Flyer: What great info. I'm having a similar issue with the fuel PSI readings. Intermittent high but the pump has been checked and seems to operate normally despite the rogue readings. The issue comes on just as ronin5573 described: All systems normal, then 5-10 seconds of spikes above the red line of 5.0, jumping around. Then back to normal. I have noticed this more frequently when flying at higher altitudes and on climb out. My techs (Midwest Panel Builders, SouthTec) haven't been able to identify a cause.I wonder if there's a common root issue. I'll definitely pass your suggestions on to them!
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Post by ronin5573 on Nov 7, 2021 19:41:41 GMT
there are 3: 12V+, output and ground. If these are all good.
There were only 2 wires from the sender that goes into the molex connector that it goes to Not 3 wired . From the molex to the battery with the master on I got 12 volts
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Post by LSA Flyer on Nov 7, 2021 23:19:15 GMT
I was looking at the schematic for the instrument pin connections for a G3x installation. The sender grounds to the case leaving only the signal and 12v. My thinking was to check connections at the GEA 24. I assume the molex connection you are referring to is the intermediate connection to the main harness wire bundle. In order of probability the usual cause is: 1st bad sender, 2nd bad electrical connection or ground, 3rd mechanical.
Please verify the issue is not actual pressure related using a mechanical gauge.
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Post by ronin5573 on Nov 7, 2021 23:23:36 GMT
I will check the GEA 24 . I think it’s mounted right above the passenger rudder pedals. It’s also mounted on an angle. Maybe easier to remove the right side G3X sreeen to get access l
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Post by cole505 on Nov 8, 2021 16:03:43 GMT
I had a Similar issue with my oil temp very erratic. I traced the sensor wire from the engine to the molex connector the female side of the pin had been pulled out off the back side of the connector. I extracted the pin soldered in a new pin good to go……. I had found the spark plug wires had been strapped to the wire going into the molex connector. So when I pulled the spark plug boot for plug change it was also pulling on the wires going into the oil temp connector……. I called Brett at lending edge airfoils he also told me he had spoken to several other pilots with similar issues both temperature and pressure …..
Ray & Lucy ✈️👍🏻✅😊🇺🇸
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Post by ronin5573 on Nov 8, 2021 16:25:46 GMT
I had a Similar issue with my oil temp very erratic. I traced the sensor wire from the engine to the molex connector the female side of the pin had been pulled out off the back side of the connector. I extracted the pin soldered in a new pin good to go……. I had found the spark plug wires had been strapped to the wire going into the molex connector. So when I pulled the spark plug boot for plug change it was also pulling on the wires going into the oil temp connector……. I called Brett at lending edge airfoils he also told me he had spoken to several other pilots with similar issues both temperature and pressure ….. Ray & Lucy ✈️👍🏻✅😊🇺🇸 I will check that as well. I only see this problem in flight. On the ground its perfect which makes troubleshooting a hassle. |
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Post by LSA Flyer on Nov 9, 2021 2:07:54 GMT
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Post by ronin5573 on Nov 10, 2021 16:56:03 GMT
Just put an hour on the plane and oil presssure was rock stable. I think the issue was the harnesses that goes into the GEA24 wasn’t all the way seated.Most of the screws that secure the connectors into the box were not tight. I’m Optimistically hopeful.
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Mike B
Junior Member
Posts: 52
Home Airport: Summer 2P2 Winter KSRQ
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Post by Mike B on Nov 11, 2021 2:39:36 GMT
This is on a 2018 p2008 with a rotax 914. I’m getting erratic oil pressure readings. It goes from 60psi to 150 and off the chart when just blinks red and then backs down to a normal range only to go way up a second later, On the ground it seems to read normal in the 60 psi range. I have replaced the oil pressure sender model number 456180, the crazy reading remain. I have reseated the molex connectors that the sensors plug into which bundle up behind the gear box. I only see one ground wire which bolts to the top of the engine. Was tight and corrosion free. I’ve only had the plane a week so I can’t say if this has been an ok going issue. The engine has 115 hours on it. The other readings fuel psi oil temp etc read prefect and are stable. It’s just the oil pressure. Anyone with experience with this aircraft have and ideas ? The molex connectors on the early Cirrus aircraft were notorious for bad connections causing random engine instrument excursions. Not saying that this is the cause under the current thread but when checking all connectors a shot from a spray can of Deoxit might help solve some gremlin problems. mb |
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Post by LSA Flyer on Nov 12, 2021 1:49:55 GMT
Nice find! Thanks for letting the group know the outcome. Happy landings.
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Post by ronin5573 on Jan 30, 2022 21:27:40 GMT
Anyone removed the GEA 24. Or the engine management computer. It’s on a shelf right above the copilots pedals. I want to check the connectors but can’t really get to it. Any ideas ?
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