A friend of mine is stuck in aidaho right now with his EDM 900 saying "bad oil pres" with an X through the oil pressure gauge. Has anyone else experienced this? My guess is it's just an indication problem.

Sounds like a bad sensor or wire issue. I've seen this before with other sensors on 900/930 installs.

Bdiazair wrote:Sounds like a bad sensor or wire issue. I've seen this before with other sensors on 900/930 installs.

X2. Look for two wires to the sensor and inspect their condition.

Is the old oil pressure gage still in the plane, and does it back up the EDM? How about oil temp, CHT temps. Do they confirm the message?

I once had oil pressure drop to 0 at night over some really crappy terrain. Temps stayed normal, so I chose to continue to the next airport (about) 1 hr away. It turned out to be the oil pressure regulator was stuck open. Oil was getting to the engine, just no indication.

I was as nervous as a whore in church even though the temps were normal.

Can he get someone to fly in with a real oil pressure gauge for a quick check.
I had a smaller JPI but NEVER got rid of my analog oil pressure gauge.

Oil pressure is the only instrument I will not fly without, and have flown-
ferried a couple with nothing BUT oil pressure.

looks a bit like the old audio days when some stayed with separate components
while others bought ALL IN ONE units. IF, one goes out the whole system
goes to the shop.

Personal view
To each his own

Chris C

wannabe wrote:Can he get someone to fly in with a real oil pressure gauge for a quick check.
I had a smaller JPI but NEVER got rid of my analog oil pressure gauge.

Oil pressure is the only instrument I will not fly without, and have flown-
ferried a couple with nothing BUT oil pressure.

looks a bit like the old audio days when some stayed with separate components
while others bought ALL IN ONE units. IF, one goes out the whole system
goes to the shop.

Personal view
To each his own

Chris C

I'm planning on flying in there when the weather breaks, just don't know what was changed for the oil pressure sense when the edm was installed. No idea what fittings are needed to adapt to a real gauge

Just want to throw this into the thinking machine: when my engine's oil pressure gauge went to zero, the oil temp and CHT were both normal. For a brief time, I was sure it was a problem with the oil pressure gauge. A short time later, the prop suddenly oversped, and seconds later there was the most awful clanking and shaking, followed by oil smoke in the cabin, the prop stopped, and I landed in a field. In other words, the only gauge that showed an anomaly was the oil pressure gauge, and it was right. So for myself, I wouldn't even think of flying an airplane that had only one oil pressure gauge which showed no oil pressure. Now if I had 2 oil pressure gauges, and one of them showed pressure and the other did not, that would be different.

Cary

Cary wrote:Just want to throw this into the thinking machine: when my engine's oil pressure gauge went to zero, the oil temp and CHT were both normal. For a brief time, I was sure it was a problem with the oil pressure gauge. A short time later, the prop suddenly oversped, and seconds later there was the most awful clanking and shaking, followed by oil smoke in the cabin, the prop stopped, and I landed in a field. In other words, the only gauge that showed an anomaly was the oil pressure gauge, and it was right. So for myself, I wouldn't even think of flying an airplane that had only one oil pressure gauge which showed no oil pressure. Now if I had 2 oil pressure gauges, and one of them showed pressure and the other did not, that would be different.

Cary

That's the one in a million scenario why I'm flying in on Wednesday

Jeredp wrote:

Cary wrote:Just want to throw this into the thinking machine: when my engine's oil pressure gauge went to zero, the oil temp and CHT were both normal. For a brief time, I was sure it was a problem with the oil pressure gauge. A short time later, the prop suddenly oversped, and seconds later there was the most awful clanking and shaking, followed by oil smoke in the cabin, the prop stopped, and I landed in a field. In other words, the only gauge that showed an anomaly was the oil pressure gauge, and it was right. So for myself, I wouldn't even think of flying an airplane that had only one oil pressure gauge which showed no oil pressure. Now if I had 2 oil pressure gauges, and one of them showed pressure and the other did not, that would be different.

Cary

That's the one in a million scenario why I'm flying in on Wednesday

I don't know about one in a million, but it's one I don't want to repeat!

Cary

I am planning on installing a 900 in the near future. What did the 900 show with the master on and engine not running before this problem? Did it X out the guage or just show 0 pressure? I would say that would give you a pretty good idea whether it is a monitoring system problem or an actual engine pressure problem. But i agree, I would not fly it until knowing for sure.

A line should be run from the engine to the firewall where the new sensor is mounted. Check the wires. If a continental, pull the pipe plug from the top of the oil cooler base and connect your line there. Run the line through the cowl and out of the oil door to keep it away from the prop. Use a 100 psi guage. Should be able to do it without any oil loss or even pulling the cowl. I believe the plug may be allen head.

Flew into moose creek, diagnosed and replaced a bad oil pressure sensor. After this, I would recommend anyone thinking about and EDM to leave any mechanical gauges that you wouldn't be willing to fly without. All worked out in the end and I had a great 5 1/2 hours of flying in some amazing country!

Good JOB - Glad to hear.
And of course I agreed from the start.

Wannabe relieved

Chris C