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  #1  
Old 05-02-2009, 01:58 PM
1/4 German Sucker
 
Join Date: Sep 2005
Location: Lake Camanche, CA
Posts: 78
'72 280SE 4.5 Sticky Throttle

Well, the cruise control I've always wanted has now become an unfortunate reality.

As I press down on the pedal - normal operation. When I let off - it'll come back about 1/3 of the way but I have to reach behind it with my toe to pluck it back. I have already removed the pedal.

Removed the air filter/cleaner and checked for obstructions, and don't see any. One of the springs looks to be a little worn, and where it connects back to the intake, the small plate is loose. I manually held the plate back a little bit and had my wife hit the throttle. Situation improves, but not by much. This is a relatively new problem - the car sat garaged for about 2-3 months (through the worst of winter) and gets driven about 4-5 times per month on a regular basis.

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Brad

Current Headaches:
'72 280SE 4.5 - 120k (Rebuilt Motor, now just a weekend driver)
'06 F-250 Crew Cab 4x4 (102k in 2.25yrs)
'06 F-150 SuperCrew Lariat 4x4 (My wife's S-Class)
'85 GMC Suburban 2500 (Lifted, Built 350) The new camping rig.

Former MB Headaches:
'66 250SE 4-spd Black w/vinyl top
'67 250SE Auto British Racing Green
'71 220D Family project car, now in lucky hands of my sister and brother-in-law. Finally someone's DD again!
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  #2  
Old 05-04-2009, 01:15 PM
Tomguy's Avatar
Vintage Moderator
 
Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,397
The return spring is mounted on the firewall. If the throttle is sticking open it sounds like either this spring is broken/disconnected, or your main linkage shaft that the spring attaches to is "sticky" inside the plastic bushings.

I've seen the plastic bushings missing and resulting in no throttle operation when hit, but not vice-versa.
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Current:
2021 Charger Scat Pack Widebody
1999 Chrysler 300M - 219,000+ miles

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
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  #3  
Old 05-04-2009, 11:55 PM
1/4 German Sucker
 
Join Date: Sep 2005
Location: Lake Camanche, CA
Posts: 78
Tom,

Thank you! Looked up some of the old pictures of Quicksilver you had in an old thread, and spring looked like it was within tolerances. All the joints were reasonably lubricated...

Low and behold- the easiest things fix themselves quickly with some hand manipulation and some WD-40. Was the plastic bushings- it was binding up there. The blue beast is back on the road once again (sans the new seat that I need to still figure out.
__________________
Brad

Current Headaches:
'72 280SE 4.5 - 120k (Rebuilt Motor, now just a weekend driver)
'06 F-250 Crew Cab 4x4 (102k in 2.25yrs)
'06 F-150 SuperCrew Lariat 4x4 (My wife's S-Class)
'85 GMC Suburban 2500 (Lifted, Built 350) The new camping rig.

Former MB Headaches:
'66 250SE 4-spd Black w/vinyl top
'67 250SE Auto British Racing Green
'71 220D Family project car, now in lucky hands of my sister and brother-in-law. Finally someone's DD again!
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  #4  
Old 05-05-2009, 05:52 AM
Registered User
 
Join Date: Jan 2006
Location: Tucson, AZ
Posts: 5,345
If you have the plastic bushings then spraying them with WD40 was the worst thing you could do!

Clean them with de-natured alcohol and then give them a shot of a silicone lube or pull them apart, clean them and re-assemble using some petroleum jelly. Spray White grease will work also. WD40 will eat the plastic. It works "okay" until it dries but it attracts dirt and will act as an abrasive.

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