 BUCKING, Clutch and throttle |
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| ctc911ctc |
 May 8 2023, 07:32 PM
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#1
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Senior Member  Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States 
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'74, 2.0, 25K miles original (IMG:style_emoticons/default/biggrin.gif)
Spring is here and that means I will return to working on the car instead of looking at this beauty in my garage! The clutch is a bit bucky - may refer to this as chattering. New clutch and plate, HOWEVER, I did not mill the Flywheel - clutch and plate were original so I replaced them. I swear the flywheel looked perfect so I did not have it........... - yea I know, I know.......however, if anyone has other suggestions? As to the bucking from the throttle - I rebuilt: Throttle system throttle position sensor the vacuum plenum - it is tight! All hoses timing - right on plugs valve clearance all injectors near everything with the exception of the wiring harness......... the bucking is when it is in a low power between coast and starting to accelerate Runs great everywhere else on the power band.   |
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| mgphoto |
May 9 2023, 07:22 AM
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#2
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
Bucking at low rpm is usually a distributor problem, I had the same issue, I went to the 123 dizzy problem solved.
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| Lockwodo |
May 9 2023, 07:25 AM
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#3
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Member Group: Members Posts: 200 Joined: 23-December 21 From: Santa Cruz, Californnia Member No.: 26,193 Region Association: Northern California
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If it's bucking on acceleration with the clutch fully engaged, it's probably the trigger points in the stock disty. Second the motion to install a 123 disty.
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| ctc911ctc |
May 9 2023, 08:58 AM
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#4
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Senior Member Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
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QUOTE(Lockwodo @ May 9 2023, 07:25 AM)  If it's bucking on acceleration with the clutch fully engaged, it's probably the trigger points in the stock disty. Second the motion to install a 123 disty. 123 disty it is - however - what is a 123 disty - will ask the answer machine |
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| r_towle |
May 9 2023, 09:00 AM
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#5
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Clean and regrease advance plates in the distributor.
I would also remove and inspect the FI trigger points Rich |
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| mgphoto |
May 9 2023, 09:47 AM
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#6
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
QUOTE(ctc911ctc @ May 9 2023, 06:58 AM) QUOTE(Lockwodo @ May 9 2023, 07:25 AM) If it's bucking on acceleration with the clutch fully engaged, it's probably the trigger points in the stock disty. Second the motion to install a 123 disty. 123 disty it is - however - what is a 123 disty - will ask the answer machine https://123ignitionusa.com/porsche-vw-bt-tu...h-programmable/ |
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| brant |
May 9 2023, 11:06 AM
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#7
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(r_towle @ May 9 2023, 09:00 AM) Clean and regrease advance plates in the distributor. I would also remove and inspect the FI trigger points Rich (IMG:style_emoticons/default/agree.gif) |
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| ctc911ctc |
May 9 2023, 12:10 PM
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#8
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Senior Member Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
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QUOTE(r_towle @ May 9 2023, 09:00 AM) Clean and regrease advance plates in the distributor. I would also remove and inspect the FI trigger points Rich Thank you Rich, will do this and report back ! |
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| StarBear |
May 11 2023, 08:09 AM
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#9
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Senior Member Group: Members Posts: 1,884 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States
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Any luck or progress? (IMG:style_emoticons/default/smile.gif)
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| ctc911ctc |
May 11 2023, 05:09 PM
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#10
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Senior Member Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
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Oh gosh no!!!
I work at a snails pace........ All of the parts on the car are in great shape (except the rusted ones which I replaced........I will most likely take it off in the next few days and rebuild it. Thank you, QUOTE(StarBear @ May 11 2023, 08:09 AM) |
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| r_towle |
May 11 2023, 06:23 PM
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#11
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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I’m lazy and forgetful
Remove distributor cap Take a well lighted picture of the orientation of the distributor. Then pull it out, stick a rag in the hole gently You can only put it in one way, you cannot seat it 180 degrees off. But….getting the timing right is why I take a picture. Btw, I’m lazy Setting points perfectly is easier with the distributor in my bench vice (IMG:style_emoticons/default/smile.gif) |
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| ctc911ctc |
May 11 2023, 06:51 PM
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#12
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Senior Member Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
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Thank you Mr. Towle, the other guy from Taxachusetts
QUOTE(r_towle @ May 11 2023, 06:23 PM) I’m lazy and forgetful Remove distributor cap Take a well lighted picture of the orientation of the distributor. Then pull it out, stick a rag in the hole gently You can only put it in one way, you cannot seat it 180 degrees off. But….getting the timing right is why I take a picture. Btw, I’m lazy Setting points perfectly is easier with the distributor in my bench vice (IMG:style_emoticons/default/smile.gif) |
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| r_towle |
May 11 2023, 07:10 PM
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#13
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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QUOTE(ctc911ctc @ May 11 2023, 08:51 PM) Thank you Mr. Towle, the other guy from Taxachusetts QUOTE(r_towle @ May 11 2023, 06:23 PM) I’m lazy and forgetful Remove distributor cap Take a well lighted picture of the orientation of the distributor. Then pull it out, stick a rag in the hole gently You can only put it in one way, you cannot seat it 180 degrees off. But….getting the timing right is why I take a picture. Btw, I’m lazy Setting points perfectly is easier with the distributor in my bench vice (IMG:style_emoticons/default/smile.gif) Happy to help if you need any parts, tools, etc |
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