I have a very jumpy cruise control and I have replaced it w/ another cc actuator and I have also swithced out the cc amplifier twice, it is still jumpy.

Could it be that the bowden cable has gone bad??
Or, loose linkage??

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http://www.libertyagrifuels.com
1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike

Not bowden cable, doubt if it is linkage unless it needs greased. The only thing left that you didn't replace is the speedometer pickup.

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C

I have noticed when my speedometer jumps around the cruise control is not steady. My speedometer only jumps when the car gets really cold below 25 deg F. After the interior warms up the speedometer stops jumping and cruise works fine. I need to pull the speedometer and clean and lube it. My ride is a 1985 300D with 240,000 miles.

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1985 300D Turbo Diesel 268,000 miles
1998 F150 4x4
2004 Honda Van
1970 Olds 455

http://www.peachparts.com/shopforum/...ine=1198976376

How much "jumpy" do you have? Can you actually feel the jumps or is it more of a "wander," a failure to hold constant speed?

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

It is steady ever? My surges on declines (down hills), works great on flats and inclines (up hills). It was loose linkage in my case. I had some play in the Cruise Control Actuator linkage to throttle. Did a temp fix using polymer film and improved conditions greatly. I still have a little play in the throttle linkage that needs to be adjusted. The Ball and Cup linkage (The cups tend to wear).

Hope that helps. Good luck.

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92 300D 2.5L OM602 OBK #59

What and where is a speedometer pickup??

It is a very very noticable jump, so much that it throws my neck back and forth.

I have another acceleration related problem that I think has to do w/ loose linkages.

How do I know that my linkages are tight enough?? Is there any precision involved??

__________________
http://www.libertyagrifuels.com
1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike

does the speedo needle jump? Mine has a kink in the cable and causes the needle to jump, since the CC uses a pickup on the speedo I assume the CC will try to adjust for the needle jump causing a cyclic throttle response from the CC actuator. my cruise is not very smooth but it is about the same as the needle jump. I hope it will be smooth once I pull another pickandpull cable

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)

Mine used to jump until I tightened the nut on the actuator linkage. It was loose causing the rod to move and the actuator to try to correct it.

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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

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