Cruise Control Surges - PeachParts Mercedes-Benz Forum

BenzDriver · #1 09-29-2004, 10:48 PM

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?

sixto · #2 09-29-2004, 10:50 PM

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

2) No idea.

Sixto
95 S420
87 300SDL

AusMBtech · #3 09-30-2004, 04:55 AM

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.

BenzDriver · #4 09-30-2004, 10:50 PM

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

sixto · #5 09-30-2004, 11:00 PM

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

BenzDriver · #6 09-30-2004, 11:17 PM

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...

sixto · #7 09-30-2004, 11:50 PM

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

Sixto
95 S420
87 300SDL

ebennz · #8 10-01-2004, 12:00 AM

your cruise control amplifier is GOING BAD.

use the "search" feature.

topic has been discussed many times.

only buy re-man if budget is tight or your selling that car. my opinion

peter

BenzDriver · #9 10-01-2004, 12:37 AM

Quote:

Originally Posted by ebennz

only buy re-man if budget is tight or your selling that car. my opinion

What is the preferred fix? New instead of reman?

ebennz · #10 10-01-2004, 01:47 AM

new.

you shouldn't have to pay a core charge.

tom hansen caliber motors mercedes wholesale 1.800.252.6877

best prices on oe stuff, 20% off [real] retail

AusMBtech · #11 10-01-2004, 05:25 PM

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.