Jerry,
The tach pickup goes through the TCU so pull the plug on the TCU and clean the
contacts and put on some dielectric grease also helps.
If you have any issues with the 914 that seem to be TCU related or sender
related
on an old engine, clean the contacts especially if you haven't cleaned them
in years.
You have to be creative on cleaning the plug, the pins in the TCU are easy.
Normally it is something simple.
Best of Luck.
Bud Yerly
-----Original Message-----
From: owner-europa-list-server@matronics.com
<owner-europa-list-server@matronics.com>
On Behalf Of Jerry Rehn
Sent: Wednesday, July 21, 2021 11:40 AM
Subject: Europa-List: GRT EIS rpm issues
My EIS started to give erratic rpm readings last year, it would move around from
to high to low and sometimes zero and then it began to run normal.
This year after a (few months not flying ) it ran normal for first few minutes
then erratic, now I get zero! All other EIS readings are working properly.
I spent a great deal of time checking grounds and the wire running to the ECU.
Ive checked the connection into the EIS, rechecked a number of times. Engine
running
good. I thought about the rpm pick up coil that sends the rpms to the ecu
might be issue but since the turbo is functioning properly, the ecu must be
getting rpm data from the coil?
Ive installed a tiny tach to check rpms and that indicates proper rpms.
Im now looking at pulling the EIS and sending it to GRT to test, reluctant to
send
it, with all the delays Im sure will come with that but running out of options.
The unit has worked perfect for close to 20 years, maybe old age is issue!
EIS and me!
Anyway, thought Id toss this out there, see what Im missing.
Thanks
Jerry
Mono, 914
Sent from my iPad
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