Hello dear forum members and greetings from Norway where its 20 degrees below zero!
I have had a lot of use of this forum as a "passive" member, which have solved several problems I've had with my Omega.
Now, however, I have a problem where I've come to a dead end after reading the forum all evening and spending the last week trying to fix the car. I hope with all my heart that some of you with all your knowledge could shed some light on how to proceed to solve the problem.
This is the case:
The car is a 1996 Omega Estate 2,5 Auto. About a month ago I replaced the AR25 gearbox with an AR35 gearbox, from a newer donor car. After the replacement, the car had new life to it, it ran better and geared a lot smoother.
This past week the gearbox suddenly went into limp mode (stuck in third gear while in drive), with no warning light or anything. I can gear manually to 1st and 2nd gear but in 'Drive' its always stuck in third gear.
To solve the problem, I started with thoroughly cleaning all the contacts on the gearbox (I have just had the entire underside of the car sprayed with oil to stop rust, and there's been a lot of snow) so I thought there was a bad connection. This didn't help.
After reading more on this forum, my guess was the selector switch. The selector switch looked really bad inside so I decided to replace it with the selector switch from the old AR25-gearbox which used to work nicely and also looked nice inside. This didn't help either..
I have no problems with the LED's in the selector inside the car, they all work like they should.
I also have a cheap "tech2" diagnostic tool, "My Naff Code Reader"/Lonelec. When I first tried, I managed to connect to the gear box and there was a lot of error codes (unfortunately I didn't write them down. I cleared all the error codes, but one remained: "Power relay voltage low".
After that, I haven't been able to connect to the gearbox with the diagnostic tool. Today, I went to a friend of a friend that works in an Opel-dealer, and he tried to connect with both TECH2 and TECH1 but he was also unable to connect to the gearbox.
So now I'm pretty clueless where to look next. I don't have a clue where the relay's are, and the Opel-guy was too busy to provide me with any more assistance or wiring diagrams.
Does anybody have any tip on what to check for? I feel a bit desperate right now, I spent so many hours upgrading the car and now this happens.
Thank you for reading and I'm very thankful for every tip!