Have a '87 300DT. On the highway, the cruise control holds speed, but feels as if it is going on and off the pedal about two times per second. Any ideas?

Also, the cruise control stalk switch is pretty ragged out, as if the internal springs are shot. How hard are these switches to replace?

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'87 300D 183K
'06 E320 CDI 10K

1) Do a search on ARV or air recirculation valve.

2) No idea.

Sixto
95 S420
87 300SDL

Does your speedo needle fluctuate? The cruise control speed pickup is in the back of the speedo head. If your speedo is fluctuating then your cruise control will also.

The cruise control stalk isn't hard to replace. Remove your steering wheel and then you'll see the remainder of the trims and screws from there.

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Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32

How hard is it to remove the airbag and steering wheel?

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'87 300D 183K
'06 E320 CDI 10K

If your car has a telesoping steering wheel, see if you can pull the cluster without pulling the steering wheel.

Sixto
95 S420
87 300SDL

Why would I need to pull the cluster? In any case, I can pull the cluster without removing the wheel.

I'm guessing the need to remove the wheel is to replace the cruise control switch - which needs to be done...

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'87 300D 183K
'06 E320 CDI 10K

Sorry. I thought you were going for the speed sensor.

Sixto
95 S420
87 300SDL

I only said to fix the speedo cable IF you're speedo needle is jumping, it's the cheapest fix before heading for the control unit which is the next most likely cause of your fault.

__________________
Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32