Stutter (?)
Thread Starter
Instructor
Joined: Mar 2011
Posts: 248
Likes: 10
From: Schererville IN
Stutter (?)
'65 L76, orig motor, 69k orig miles.
"Stutter" began suddenly 2 weeks ago. Prior to that car has been running great. But 2 weeks ago I drove the car to dinner and all good on the way there. As I pulled out of the parking lot to go home it started to stutter. Never enough to stall, made it home fine.
3 weeks before this stutter, I adjusted my lifters, changed plugs, checked dwell, checked/ adjusted timing and idle, and adjusted mixture screws to get 8-9" vacuum. Car ran great after all that, until the above incident.
I read the numerous prior posts on the topic of stutter. Seems like it could be a timing issue, so I re-checked timing and it's 12 initial, 36 all in at approx 3000 rpm. Plugged vacuum at can and carb, took a drive and no change - still stutters. Wire from breaker plate on distributor is good. Distributor is bolted down tight.
Puzzled what caused the sudden change in performance. I have a B28 vac can, which is the correct one for my car. It's been on for 2 yrs and always been fine. Could it be the vac can?
Am I correct in assuming it's not "missing" since it's happening at low RPM, or could it be a bad plug wire?
What else should i check?
Thanks in advance for your help and suggestions.
"Stutter" began suddenly 2 weeks ago. Prior to that car has been running great. But 2 weeks ago I drove the car to dinner and all good on the way there. As I pulled out of the parking lot to go home it started to stutter. Never enough to stall, made it home fine.
3 weeks before this stutter, I adjusted my lifters, changed plugs, checked dwell, checked/ adjusted timing and idle, and adjusted mixture screws to get 8-9" vacuum. Car ran great after all that, until the above incident.
I read the numerous prior posts on the topic of stutter. Seems like it could be a timing issue, so I re-checked timing and it's 12 initial, 36 all in at approx 3000 rpm. Plugged vacuum at can and carb, took a drive and no change - still stutters. Wire from breaker plate on distributor is good. Distributor is bolted down tight.
Puzzled what caused the sudden change in performance. I have a B28 vac can, which is the correct one for my car. It's been on for 2 yrs and always been fine. Could it be the vac can?
Am I correct in assuming it's not "missing" since it's happening at low RPM, or could it be a bad plug wire?
What else should i check?
Thanks in advance for your help and suggestions.
Safety Car
Joined: Jan 2004
Posts: 4,270
Likes: 561
From: Macedonia Ohio
Since you changed the wires I would check them to see if one might have been damaged. Usually due to heat. Maybe it is just loose on the plug.
Also, could it be a clutch problem? If it happens at low RPMs that is where it would show up first.
Good Luck
Also, could it be a clutch problem? If it happens at low RPMs that is where it would show up first.
Good Luck
Racer
Joined: Feb 2013
Posts: 477
Likes: 15
From: Long Beach Ca
I would recheck the spark plug gaps and make sure the wires have a tight fit. If that doesn't help then try another ignition coil.
I had a similar experience with mt 327/350. # 8 plug had a gap of about the thickness of a piece of paper. The only thing I could
think of is I must have dropped it and just picked it up and reinstalled it. That combined with a very loose fitting wire. New wires
and regapped plug made a huge difference.
I had a similar experience with mt 327/350. # 8 plug had a gap of about the thickness of a piece of paper. The only thing I could
think of is I must have dropped it and just picked it up and reinstalled it. That combined with a very loose fitting wire. New wires
and regapped plug made a huge difference.
Last edited by SS409; Aug 4, 2013 at 11:12 AM.
