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It is almost certainly a faulty oil pressure sender.
We had the same problem which affected a number of the other readings. We
have one of the older Grand Rapids units but the circuitry is likely to be
similar.
Once we changed the oil pressure sender the problem went away.
Its also worth checking the connection to the temperature sender as this can
work its way loose and vibrate. Best soultion is to solder the sender wire
to the brass connector on top of the sensor - make sure the wires are well
supported or the solder joint will eventually break - a coating of silicone
bath sealant will fix this. If you need to disconnect the sender in future
just leave the solder joint and cut the wire 3 inches upstream and make a
repair to reconnect (or use a bullet connector).
Carl Pattinson
G-LABS
----- Original Message -----
From: "Martin Tuck" <MJKTuck@cs.com>
Sent: Friday, January 23, 2009 3:52 AM
Subject: Europa-List: Grand Rapids EIS-2004 Question
>
>
> Hi Folks,
>
> I have had my Grand Rapids EIS (Model 4000) installed for a year now and
> it really performs well - ah, until recently. While I was taking a cursory
> look during one flight I noticed my oil pressure was down in the 20 psi
> range and fluctuating. Then it went back up to the normal 40 psi or so.
> Then down it went again. Meanwhile the other indications were fluctuating,
> EGTs were varying 10-20 degrees up and down, the oil temperature was
> increasing and decreasing up and down in line with the oil pressure
> fluctuations. Then the warning lamp triggered and the error appeared to be
> low voltage at 6 volts, then 3 then back up to around a more normal 13-14
> volts. As I continued I would see indications from normal to warnings of
> low oil pressure, high oil temperature, low voltage, etc. then back to
> normal. Occasionally the indications were as if the unit had shut off then
> immediately restarted taking me back to the default display page. I
> decided the unit had probably developed a fault so I continued back to
> base - a long 10 minutes away.
>
> I called Grand Rapids support and they doubted the unit was at fault but
> more likely that a sender was on the fritz. What surprised me is that
> according to them, one dodgy sender affects all the readings and you have
> to basically disconnect each sender until the problem disappears. Any one
> else had any problems like this?
>
> I have to say, I would rather have a system which has independent displays
> such that one sender does not affect the others, any suggestions?
>
> Over winter I have pulled the panel and checked all the wiring which
> appears normal, no shorts, all the spare wires on the EIS have been capped
> off with heatshrink, and I flew it again today with the same sporadic
> indications occurring in the first 5-10 minutes and continuing throughout
> most - but not all, the flight. I guess I will try to track down the dodgy
> sender.
>
> Thoughts anyone?
>
> Regards,
> Martin Tuck
> Europa N152MT
> Wichita, Kansas
>
>
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