I have a 1993 Volvo 940 GL Regina engine. The car was working fine, but it had the check engine light on. I took the car to the dealership and they said the car was fine and that the computer flashed the code 1-1-1 which means that the car is operating fine. The mechanic at the shop decided to do some cleaning of parts under the hood and I saw him use DW-40. The next day the car's RPMs were too high. I believe that by mistake something was broken or damaged while at the shop. I took the car back to the dealership and as the day went by and they worked with the car the problem got worse. I have been waiting for 3 months and finally they say that the problem with the car is the computer. They say that the problem is in the microship that controls the RPMs. They mentioned something about electrical currents. I would like to know if this sounds right or if they are playing with me? They have lied to me in the past and I don't believe them anymore. All I want is my car fixed and in good working conditions. The same way it was before I took it there. Any ideas?

In fiddling with whatever they did, they might very well have left a connector loose. It is pretty easy to do, I've done it before accidentally.
I do think that many dealerships talk to all their customers, but especially female ones, as if they have no clue. They toss out a few words and hope that you'll pay and go away. This happens a lot when they really don't know what's going on either.
I think another shop would be welcome about now, but try to find one that's a Volvo specialist, or advertises "fuel injection" work. Some shops are Bosch certified, which is a good thing.

I suspect that the throttle switch is either not making contact or they accidentally disconnected it- the electrical connector on the backside of the throttle should be checked. The throttle switch should click audibly if you operate the throttle, under the hood, by hand with the engine off. That's the pulley you'll see at the top of the engine if you look from the driver's side of the car. Turn it clockwise, and listen for a faint click from below. If it clicks, good, if not maybe it's too filthy or out of adjustment. That's an easy remove-and-clean job, and the gasket is just $1.

Also, look for any disconnected hoses under the hood- any air leaks will usually cause a high idle speed as well.
Good luck with it!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 234K, '82 245T/M46-182K, '89 244DL/AW70- 212K Not too distant past: 86 244DL 215K, 87 244DL 239K, 88 744GLE 233K, 88 244GL 147K, 91 244 183K

Computers are expensive, idle air control valves are a lot less. I would take out the IAC and clean it real good with carb or throttle body cleaner. Same thing happened to me and cleaning but didn't solve the high RPM, only made it worse. Problem was solved when I bought a new IAC for $200. Only takes 15 minutes to install. I have a great Volvo dealership who let me try out a brand new IAC off the shelf, plug it in, to see if it fixed the problem before buying it. It fixed the high RPM's immediately so of course I bought it then.
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1990 740GL Wagon 240k AW70L B230F 8 Valve Non-Turbo Rex/Regina Non-EGR R-12 A/C

1-the idle motor is controlled by the injection ecu. by changing the current, it moves the idle motor. it contains the chip you mentioned. the wd-40 was to perhaps lube the idle motor, they can stick.

2-you don't trust them, get a 2nd opinion. you might find a better shop that way. good luck, chuck.