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914World.com _ 914World Garage _ BUCKING

Posted by: ctc911ctc May 8 2023, 07:32 PM

'74, 2.0, 25K miles original 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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Posted by: mgphoto May 9 2023, 07:22 AM

Bucking at low rpm is usually a distributor problem, I had the same issue, I went to the 123 dizzy problem solved.

Posted by: 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.

Posted by: ctc911ctc May 9 2023, 08:58 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

Posted by: 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

Posted by: mgphoto May 9 2023, 09:47 AM

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-tune-4-cyl-naturally-aspirated-and-1-8-l-jet-includes-spacer-bluetooth-programmable/

Posted by: brant May 9 2023, 11:06 AM

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

agree.gif

Posted by: ctc911ctc May 9 2023, 12:10 PM

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 !

Posted by: StarBear May 11 2023, 08:09 AM

Any luck or progress? smile.gif

Posted by: ctc911ctc May 11 2023, 05:09 PM

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) *

Any luck or progress? smile.gif


Posted by: 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 smile.gif

Posted by: ctc911ctc May 11 2023, 06:51 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 smile.gif


Posted by: r_towle May 11 2023, 07:10 PM

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 smile.gif


Happy to help if you need any parts, tools, etc

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