Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #1  
Old 07-18-2018, 02:04 AM
DarrenX33's Avatar
DarrenX33 DarrenX33 is offline
Senior Member
 
Join Date: Sep 2002
Location: St Charles, Illinois
Posts: 5,472
Thanks: 1
Thanked 4 Times in 4 Posts
Default Crappy idle, misfire on one cylinder.

Anyone one have any thoughts on this?

Plug 2 is not firing. All others look fine. I tried the following to get 2 to work..

1) plug swap 1 to 2, no change
2) new plug wire, no change
3) tighten up plug, no change
4) change cap, no change
5) change rotor, no change
6) change timing, no variation of timing brings 2 back.
7) change capacitor, no change
8) watched for spark on plug while grounding it. no spark until you hit about 1500 rpm, then spark is there but looks weak. Perhaps my spark is weak all around.

Distributor was just rebuild/restored by Jerry MacNeish. I have new plugs, wires, coil, engine harnesses. Totally stumped.
__________________
1969 Z28
1972 Corvette
Reply With Quote
  #2  
Old 07-18-2018, 03:59 AM
Mr. Chevy's Avatar
Mr. Chevy Mr. Chevy is online now
Yenko Paid Member
 
Join Date: Feb 2007
Location: Northern Ohio
Posts: 3,976
Thanks: 57
Thanked 183 Times in 139 Posts
Default

Maybe you have a faulty coil even though its new... Are the points ok??

Rich
__________________
"This is Sheriff Buford T. Justice, I'm in pursuit of a black Trans Am, he is all mine so stay out of the way"
Reply With Quote
  #3  
Old 07-18-2018, 10:56 AM
Woj's Avatar
Woj Woj is offline
Yenko Paid Member
 
Join Date: Nov 2005
Location: Cleveland, OH
Posts: 1,618
Thanks: 13
Thanked 103 Times in 62 Posts
Default

It seems like the coil is the only thing you have left to change. Maybe swap out the coil for a known good coil? One thing I have found in the past is that most point sets, even the later GM are junk. I was told to give Echlin points a try, I did and really do like the quality of their points. I bought these at NAPA.

Good luck and let us know what you find.
Reply With Quote
  #4  
Old 07-18-2018, 10:58 AM
1967 4K 1967 4K is offline
Senior Member
 
Join Date: Jul 2012
Location: Ky.
Posts: 177
Thanks: 6
Thanked 16 Times in 8 Posts
Default

Do a cylinder compression check. Could be in the valve train, hope not.
__________________
1967 Camaro SS 396/375 4K
Reply With Quote
  #5  
Old 07-18-2018, 11:12 AM
Postsedan Postsedan is offline
Yenko Paid Member
 
Join Date: Aug 2003
Location: Chicago Suburbs
Posts: 11,345
Thanks: 2
Thanked 233 Times in 193 Posts
Default

This is what I use on all my cars. As Phil said, today's points are junk.
Your very first tow ride home and you will throw away them points.

https://www.lectriclimited.com/break...nversion-85309

Dan
__________________
69 300 Deluxe Post Sedan Frost Green
69 SS396 300 Deluxe Post Sedan Lemans Blue SOLD
70 Buick Skylark Post Sedan Gulfstream Blue
70 Buick Skylark Post Sedan Burnished Saddle

http://m.youtube.com/watch?v=PM3DE8qI2NY

https://m.youtube.com/watch?v=Yn4xEmGypUw
Reply With Quote
  #6  
Old 07-18-2018, 11:38 AM
cook_dw cook_dw is offline
Yenko Paid Member
 
Join Date: Oct 2003
Posts: 2,736
Thanks: 144
Thanked 291 Times in 167 Posts
Default

Was it running fine before the distributor rebuild? Swap distributors would be the first thing I'd do if the previous statement was true. If it cleared up then I would send it back. But FWIW its more than likely the points. Local autoparts store used to have points/condenser kit where the condenser was made onto the point plate and they were great. Never had an issue with them. Blue Streak was the name but I wanna say it was owned by Standard Motor Ignition or Products..
__________________
Darrell Cook

If you have a 65 - 70 Solid Lifter GM vehicle please email me at cook_dw@hotmail.com so I can add your vehicle to my database.

Last edited by cook_dw; 07-18-2018 at 11:45 AM.
Reply With Quote
  #7  
Old 07-19-2018, 12:29 AM
L78steve L78steve is offline
Yenko Paid Member
 
Join Date: May 2006
Location: Hendersonville NC
Posts: 919
Thanks: 6
Thanked 22 Times in 22 Posts
Default

If the distributor was run on a Sun machine and it tested good you can rule the Dist. out as being the problem, points included.
__________________
"Knowledge is good" Emil Fabor
67 L/78 Camaro SS/RS H-H,1W,2LGSR,3SL,4K,5BY. (Sold)
70 L/78 Nova M-21,Black Cherry,Sandalwood Int.
09 Pontiac G8 GT Premium,Sport,Roof. Liquid Red.
Reply With Quote
  #8  
Old 07-19-2018, 12:36 AM
cook_dw cook_dw is offline
Yenko Paid Member
 
Join Date: Oct 2003
Posts: 2,736
Thanks: 144
Thanked 291 Times in 167 Posts
Default

Never assume.. You will make an ass out of....... Well you get the point.


As the great President Reagan once said. Trust but verify.
__________________
Darrell Cook

If you have a 65 - 70 Solid Lifter GM vehicle please email me at cook_dw@hotmail.com so I can add your vehicle to my database.
Reply With Quote
  #9  
Old 07-19-2018, 12:44 AM
tunes's Avatar
tunes tunes is offline
Senior Member
 
Join Date: Jun 2014
Location: SW Missouri
Posts: 132
Thanks: 32
Thanked 32 Times in 22 Posts
Default

Change the coil. This sounds like a friend's car last year that suddenly wouldn't run. It had a weak spark and would try to start. The culprit was the coil.
__________________
Robert
_______________
1969 L78 Chevelle
Reply With Quote
  #10  
Old 07-19-2018, 01:27 AM
Lee Stewart's Avatar
Lee Stewart Lee Stewart is offline
Senior Member
 
Join Date: Mar 2017
Location: ABQ, New Mexico
Posts: 9,932
Thanks: 315
Thanked 2,139 Times in 1,547 Posts
Default

Would the engine experience the same symptoms if either the lifter got stuck or a valve spring broke?
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 05:13 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.