The 940 has been on the road for a few months now and she has been running fine. Thought I would post an update of a few things I've been doing.
I sorted out the fast warm idle problem where it was idling at around 1200rpm. It was a dirty connection to the idle valve. I had checked and re-checked the throttle body adjustment to no avail so I started poking around elsewhere. That's when I discovered the plug had some minor corrosion in it. A shot with some contact cleaner and some di-electric grease for good measure and she idles normal again.
While I had the throttle body out I replaced the little o-ring on the end of the throttle plate spindle. This little known seal is on the end opposite to the throttle body behind the spring. It can harden with age and heat like any other seal. In this case part of was missing:
It broke into several pieces when I removed it. I had a new one I had bought from FCP a while ago so I threw that on. Whether it made any difference to the running of the car I don't know. It does sound a little smoother but it could be my imagination.
Next job was the faulty air conditioning. The AC wouldn't work when it was hot which, ironically, is when I want it most...
I was pretty sure I knew the cause of the problem having experienced it on my 91 940 many years ago. Sure enough there was a cracked solder under the small black relay (centre of photo below).
I reflowed the solder and reassembled and now I have working AC. This control unit is not the car's original. The cover has "93 940" in pink pen written on it. So I suspect this problem may have occurred before and rather than fix the solder someone simply replaced the unit.
Last weekend I re-attached the badges to the boot lid after having it repainted back in February. Something I didn't know was that early 940s had metal badges while later models, like this one, had plastic badges. The silver colouring was wearing away showing the black underneath. Fortunately I had a pair of the correct metal badges from a 940GLE I stripped for parts a few years ago. I used some 3M double sided adhesive tape meant for automotive use. It was fiddly cutting bits small enough to fit the various shapes on the back of the badge but I got there and I'm happy with the result. I think it looks much better with the badges.
This weekend I gave her an engine oil and filter change. Nothing much else mechanically needed to be done since it had all been covered during the restoration process. I did, however, have to tighten the bolts on the transmission sump as they had worked loose and there was a small leak. If that doesn't work I'll need to replace the gasket.
I also added the first accessory to the 940. A digital ambient temperature display which sits in the instrument panel. I bought it from a bloke off Turbobricks. On this model the wiring is already in place and it's reasonably simple matter of plugging in the sensor and the display.
The plug for the sensor is tied up next to the horns under the front bumper:
The sensor clips into this hole in the eggcrate grille under the bumper:
The accuracy of the sensor in this position is questionable as it'll be copping all the air flow at speed but I'll see how it goes.
Remove the instrument cluster from the car then remove the 2 screws on the cover plate on the bottom left of the cluster and screw in the digital display:
Attach the plug to it's mate in the car:
Late 940s (from 1995 or 1996?) have a black plug instead of a white plug. They are not interchangeable. If your car has a black plug you need a display with a black plug too.
Put it all back together and enjoy:
That's it for now.
