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Missfire under load #2782850
06/08/20 02:25 PM
06/08/20 02:25 PM
Joined: Aug 2007
Posts: 87
ohio
6
69coronetr/t Offline OP
member
69coronetr/t  Offline OP
member
6

Joined: Aug 2007
Posts: 87
ohio
Car was running great and slowly developed a miss under load . Its starts at about 3400 rpm,seems to be one cylinder, plugs look good ,valve lash looks good .Here's the kicker I'm running a early 90s vertex mag and a 650 holley.As I'm typing I think I'll check the fuel filter. But anyhow I want to rule out the mag any ideas? I'm going to put it back together and put a thermal light on each header tube to isolate the cylinder.

Re: Missfire under load [Re: 69coronetr/t] #2782922
06/08/20 04:09 PM
06/08/20 04:09 PM
Joined: Jun 2003
Posts: 19,017
It's a dry heat
gtx6970 Offline
I Live Here
gtx6970  Offline
I Live Here

Joined: Jun 2003
Posts: 19,017
It's a dry heat
misfire under a load sounds like plugs or wires

Re: Missfire under load [Re: gtx6970] #2782927
06/08/20 04:18 PM
06/08/20 04:18 PM
Joined: Jan 2003
Posts: 5,990
JERSEY
RJS Offline
master
RJS  Offline
master

Joined: Jan 2003
Posts: 5,990
JERSEY
I'd look at each wire ( pull out of cap one at a time) Also off each plug and I bet there is a bad crimp or corrosion on one.
Ron

Re: Missfire under load [Re: 69coronetr/t] #2782986
06/08/20 06:15 PM
06/08/20 06:15 PM
Joined: Aug 2007
Posts: 87
ohio
6
69coronetr/t Offline OP
member
69coronetr/t  Offline OP
member
6

Joined: Aug 2007
Posts: 87
ohio
I may have found the problem, the spring loaded contact to the rotor seems to be to loose and sloppy! I have a new cap and rotor coming thanks for the input! Also I checked everything that was mentioned.
Thanks Guys I'll let you know if that's it







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