cruse controle

[rmcriley2001]

sometimes my cruse control works, usley it doesn't, when it dose work it evetuley fails sometimes it serge's a few times then shuts off or it runs away and I have to shut it off.

[This message has been edited by rmcriley2001 (edited 09-23-2001).]

[Lawrence Coppari]

Sometimes the solder connections on the board go bad. You might try to resolder all connections on the board. Also, clean the contacts where it plugs in. The fact that it works sometimes indicates a bad connection or an overheating component on the board. I'd try the resoldering solution. Use a small soldering iron.

Clean where board plugs in first. If that does not work, then I'd do the resoldering.

I once had a Mercedes HVAC board that would suddenly turn the heat on in the summertime. It turned out to be an overheating transistor that would break down when it reached a certain temperature. I found it by spraying refrigerant on it while holding the board in my hand hooked up by a bunch of wires instead of being plugged in. When sprayed with refrigerant, the heat would turn off and AC would start. As it heated up, the heat would come back on. Replaced transistors.

[idopps]

I have the same problem. I cleaned the adapter contacts, and that helped a bit. When you say resolder, do you mean EVERY little thing on the board, or just a certain part?

[Charles]

Originally posted by idopps:
When you say resolder, do you mean EVERY little thing on the board, or just a certain part?

After perusing a handful of posts and web pages on the subject, I'm beginning to doubt that there is one single chip at fault. The word from the lab at work was that most of the solder joints looked suspect, and that the conformal coating had all of the outward appearances of varnish (which is probably worse than leaving the board uncoated).

Resolder the passive components first (resistors, capacitors) and then work up to the larger ones. If you're not used to solder reworking techniques, you can cook some of the semiconductor parts. But hey, it's broken already, right?

-C
'85 944 NA

[rmcriley2001]

Where is the board located? is it the box right under my steering coulomb?

[Lawrence Coppari]

I would resolder everything.

Get a small pair of needle nose pliers and hold the wire to the component between the component and the soldering. The soldering is done on the back of the board. The pliers hold the wire on the other side of the board and serve as a heat sink that soaks up some of the heat traveling up the wire that can damage the component.

There were over 100 joints on my Mercedes. Needless to say, use a small soldering iron.

On my 86 951, the board is in an aluminum box above my left leg about over the clutch pedal.

[This message has been edited by Lawrence Coppari (edited 09-26-2001).]

[Charles]

Originally posted by rmcriley2001:
Where is the board located?

On pre-85/2 944s, it is to the right of the accelerator pedal behind a kick panel (right over the torque tube hump)

-C