|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
10-01-2020, 04:03 PM | #1 |
Senior Member
Join Date: Aug 2017
Location: St. Maries, Idaho
Posts: 162
|
Slight high speed miss
Ok, so my 30 coupe starts very easily and runs smooth until I reach road speed, about 45 mph. At that time it seems to develop a slight miss.I have the more modern points set up installed, timing is set with a light, point gap is set with a dial indicator, spark plug gap is correct and the plugs look good. What should I be checking next? Thanks
|
10-01-2020, 04:08 PM | #2 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: Slight high speed miss
How does it change with changes in fuel adjustment or spark lever settings ?
|
Sponsored Links (Register now to hide all advertisements) |
|
10-01-2020, 04:26 PM | #3 |
Senior Member
Join Date: May 2010
Location: Southern California
Posts: 3,122
|
Re: Slight high speed miss
If you have a modern wireless lower plate installed in the distributor check to see if there is a burn mark on the slider at the position you have the spark advance set to when traveling at 45 mph.
Tom Endy |
10-01-2020, 04:32 PM | #4 |
Senior Member
Join Date: Aug 2017
Location: St. Maries, Idaho
Posts: 162
|
Re: Slight high speed miss
The GAV nor the spark lever position seem to have any effect on it. When I say "slight" miss I mean you really have to pay attention to notice it but it is there.
|
10-01-2020, 04:33 PM | #5 |
Senior Member
Join Date: Aug 2017
Location: St. Maries, Idaho
Posts: 162
|
Re: Slight high speed miss
Thanks I will have a look for that. What would cause the burn mark if it is there?
|
10-01-2020, 04:58 PM | #6 |
Senior Member
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,114
|
Re: Slight high speed miss
Sponsored Links (Register now to hide all advertisements)
__________________
Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done |
10-01-2020, 05:08 PM | #7 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: Slight high speed miss
|
10-02-2020, 07:29 AM | #8 |
Senior Member
Join Date: Aug 2011
Location: Eagle Bend, MN
Posts: 2,025
|
Re: Slight high speed miss
Put some marvel mystery oil in the gas. ATF works too.
__________________
"There are some that can destroy an anvil with a teaspoon and shouldn't be allowed to touch anything resembling a tool." |
10-02-2020, 07:33 AM | #9 | |
Senior Member
Join Date: Aug 2018
Posts: 2,332
|
Re: Slight high speed miss
Quote:
X2. Personal experience, had Nu Rex wireless plates, after a while had some odd issues including the original poster's issue. Spent weeks tracking it down. Tried a jumper for troubleshooting which cured the issues. Went back to non wireless, no more problems. |
|
10-02-2020, 09:21 AM | #10 |
Senior Member
Join Date: Sep 2017
Location: Mint Hill, North Carolina
Posts: 386
|
Re: Slight high speed miss
Check your points. Open them up slightly.
|
10-02-2020, 10:14 AM | #11 |
Senior Member
|
Re: Slight high speed miss
Check ferrule at end of fuel line. Must right at end of tube. Tube hits screen and restricts flow.
|
10-02-2020, 10:17 AM | #12 |
Senior Member
Join Date: Jun 2013
Location: Marana Arizona
Posts: 1,771
|
Re: Slight high speed miss
"Slight high speed miss", same thing my cardiologist told me... HUH!
Couldn't resist... Chap |
10-02-2020, 01:05 PM | #13 |
Senior Member
Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,066
|
Re: Slight high speed miss
Close the plug gap slightly, say to .025", and go for a test drive. This will tell you if it a weak spark, or not. I sincerely doubt it is a fuel problem. Good luck!
|
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|