|
Register | Album Gallery | Thread Gallery | FAQ | Members List | Calendar | Become a Paid Member | Search | Today's Posts | Mark Forums Read |
|
Thread Tools | Display Modes |
#1
|
||||
|
||||
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 |
#2
|
||||
|
||||
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" |
#3
|
||||
|
||||
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. |
#4
|
||||
|
||||
Do a cylinder compression check. Could be in the valve train, hope not.
__________________
Richard 1967 Camaro SS 396/375 4K 2002 Camaro 35 Anniversay Z4C-WU8 |
#5
|
|||
|
|||
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 |
#6
|
||||
|
||||
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..
Last edited by cook_dw; 07-18-2018 at 11:45 AM. |
#7
|
|||
|
|||
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. |
#8
|
||||
|
||||
Never assume.. You will make an ass out of....... Well you get the point.
As the great President Reagan once said. Trust but verify. |
#9
|
||||
|
||||
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 Chevelle SS396 L78 M21 4.10 2023 Stingray Coupe Z51 |
#10
|
||||
|
||||
Would the engine experience the same symptoms if either the lifter got stuck or a valve spring broke?
|
Thread Tools | |
Display Modes | |
|
|