 Throttle body supplemental spring / stiff gas pedal |
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| sfrenck |
 Dec 5 2010, 07:00 PM
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#1
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Member  Group: Members Posts: 492 Joined: 28-February 10 From: Wilmington, DE Member No.: 11,411 Region Association: MidAtlantic Region 
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Just started driving my "project" ('73 2.0L with 74' F.I. setup) up and down the block for my preliminary road test. One thing I noticed, and my 79 yr. old father really noticed, was the gas pedal was very stiff.
I have already replaced the plastic bushings in the pedal cluster with the brass rebuild kit. Tonight, I disconnected the throttle cable from the throttle body and confirmed the cable / pedal was not the issue. It seems that the supplemental spring on the throttle body is the culprit. Is there a different, easier spring that I can install or is a stiff gas pedal just part of the normal Porsche engineering? Or, should I look for a '73 throttle body without the supplemental spring? Thanks - Scott |
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| sfrenck |
Dec 7 2010, 04:28 PM
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#2
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Member Group: Members Posts: 492 Joined: 28-February 10 From: Wilmington, DE Member No.: 11,411 Region Association: MidAtlantic Region
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Well... started with what I thought was the easiest- the TB. Removed it and checked the spring everything seems to move very easily with the #4 spring off of the axle - pretty hard to move with the spring connected. The spring doesn't look like someone put an extra turn on it to make it stiffer (or if they did, it has permanently deformed to the new "setting").
Now for the new question: I took of the TPS cover to see what was going on in there. Luckily I was over my workbench so when the little rubber stop piece fell out (see orange box below), I caught it. Will super glue reattach the stop to the metal arm?  Still don't really understand what the #4 spring does. Have to play around with it some more after dinner (IMG:style_emoticons/default/chowtime.gif) . |
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| realred914 |
Dec 7 2010, 04:32 PM
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#3
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Senior Member Group: Retired Members Posts: 1,086 Joined: 1-April 10 From: california Member No.: 11,541 Region Association: None |
QUOTE(sfrenck @ Dec 7 2010, 02:28 PM)  Well... started with what I thought was the easiest- the TB. Removed it and checked the spring everything seems to move very easily with the #4 spring off of the axle - pretty hard to move with the spring connected. The spring doesn't look like someone put an extra turn on it to make it stiffer (or if they did, it has permanently deformed to the new "setting"). Now for the new question: I took of the TPS cover to see what was going on in there. Luckily I was over my workbench so when the little rubber stop piece fell out (see orange box below), I caught it. Will super glue reattach the stop to the metal arm? Still don't really understand what the #4 spring does. Have to play around with it some more after dinner (IMG:style_emoticons/default/chowtime.gif) . yeah super glue, but clean both surfaces real well first. |
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Posts in this topic
sfrenck Throttle body supplemental spring / stiff gas pedal Dec 5 2010, 07:00 PM
1988Hawk
Just started driving my "project" (... Dec 5 2010, 07:10 PM
sfrenck
Just started driving my "project" (... Dec 5 2010, 08:08 PM okieflyr
[quote name='1988Hawk' post='1402366' date='Dec 5... Dec 5 2010, 08:55 PM Mikey914 There is a steel piano hinge in the OEM pedal that... Dec 5 2010, 09:21 PM sfrenck Not anything to do with the pedal cluster... actio... Dec 6 2010, 07:40 AM benalishhero When you move the TB, with the cable disconnected,... Dec 6 2010, 10:30 AM sfrenck TB movement is smooth with and without the cable a... Dec 6 2010, 01:25 PM Drums66 ...Sometimes the bushing's in the TB
wear out?... Dec 6 2010, 04:55 PM pete000 I am in this same boat. I am replacing the cable, ... Dec 6 2010, 05:05 PM SLITS Most any FLAPS will have throttle return springs. ... Dec 6 2010, 06:44 PM sfrenck Just to make sure that I'm asking about what e... Dec 6 2010, 07:20 PM okieflyr If the the throttle body is lubed and smooth as we... Dec 6 2010, 07:53 PM SLITS The spring you are showing was not called the ... Dec 6 2010, 09:01 PM sfrenck Well, I poached this image from PP and they list #... Dec 6 2010, 09:40 PM SLITS Probably a bit stiffer than modern day cars, but t... Dec 6 2010, 09:52 PM championgt1 It should not be that stiff. Maybe a little stiffe... Dec 6 2010, 10:14 PM vsg914 Isn't it amazing that most everyone misread yo... Dec 7 2010, 06:27 AM Gint Just because the cable moves freely when disconnec... Dec 7 2010, 06:41 AM sfrenck Well, I do have a spare throttle cable to replace ... Dec 7 2010, 01:55 PM geniusanthony Perhaps the spring was wound an extra turn tighter... Dec 7 2010, 03:35 PM r_towle the cable also comes into contact with the coil if... Dec 7 2010, 04:15 PM sfrenck OK - TPS "bumper" fixed. Back to the in... Dec 7 2010, 06:10 PM r_towle initial pedal resistance goes back to the throttle... Dec 7 2010, 06:26 PM sfrenck It flops freely when it's down to just the fla... Dec 7 2010, 06:55 PM r_towle well, the supplemental spring does not always exis... Dec 7 2010, 07:08 PM sfrenck Cleaned TB back in car and hooked up. The action ... Dec 8 2010, 01:03 PM r_towle Set it like the pic below when closed.
If you look... Dec 8 2010, 10:52 PM |
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