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Running Rough where to check next?

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Mr Comet
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Running Rough where to check next?

Post #1 by Mr Comet » Mon Aug 10, 2015 2:18 pm

I took my comet for it's first long road trip since my rebuild this weekend. Round trip was over 500 mi. On the return it started to run and idle rough about 35 miles from home. Temp, oil pressure and amp seemed to remain the same as before rough running. This morning I could not find any thing which appeared out of order so I am looking for suggestions which test to try to ascertain the cause. Any suggestions would be appreciated.

Thanks
Denny

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JackFish
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Re: Running Rough where to check next?

Post #2 by JackFish » Mon Aug 10, 2015 2:20 pm

Maybe hook up a vacuum guage and see where that's at.

Points or DS2??
1978 Ford Fairmont station wagon
1978 Ford Fairmont station wagon
Yup, I bought another one.
1996 Chevy Caprice 9C1 (3)
1999 Dodge Ram 2500

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ludwig
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Re: Running Rough where to check next?

Post #3 by ludwig » Mon Aug 10, 2015 2:26 pm

All the air hoses. Are they new? Might be brittle and cracked.
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bubba22349
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Re: Running Rough where to check next?

Post #4 by bubba22349 » Mon Aug 10, 2015 3:24 pm

Denny, one of the first things is to check is the fuel filter isn't plugged up. On many older cars the old fuel tank and it's original steel fuel line can have crude and or rust inside it, that then loosens up with use. Good luck :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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65coupei6
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Re: Running Rough where to check next?

Post #5 by 65coupei6 » Mon Aug 10, 2015 7:54 pm

Did you pull the plugs? Maybe they got fouled.
...Marco

'65 Mustang Inline 200. VI (CI) Aluminum Head, Holley 350, Schneider 264/274 cam,
Headers, DSII, MSD 6A, and a whole lotta other stuff!

Build That Six With Parts From VintageInlines.com

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Mr Comet
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Re: Running Rough where to check next?

Post #6 by Mr Comet » Tue Aug 11, 2015 11:00 am

65coupei6

Followed your advice and the plugs are fouled especially 6 has no noticeable gap.

ludwig

Hoses all appear good two are new this last summer the other one has no cracks.

jackfish

after the plugs get replaced I will check both the vacuum and the timing again with the new plugs. I have the DSII

Bubba

Thanks I sent you a e mail about the plug gap.

Thanks to all. This is surprising because I averaged 26-27 mpg on the highway this trip.

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Re: Running Rough where to check next?

Post #7 by CZLN6 » Tue Aug 11, 2015 1:15 pm

Howdy Denny:

What you've done looks like a good start in solving the rough running. What carb are you using? I'm still suspicious of a vacuum leak somewhere.

Your mileage sounds great!

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

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Mr Comet
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Re: Running Rough where to check next?

Post #8 by Mr Comet » Tue Aug 11, 2015 2:12 pm

David

I am using a Carter RBS carb. I have replaced the plugs gapping them to .045 because I have a DSII Ignition with a Pertronix flamethrower coil. The engine is now idling nicely at 750rpm when warm. I have still to check the vacuum and timing.

Thanks Denny

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bubba22349
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Re: Running Rough where to check next?

Post #9 by bubba22349 » Tue Aug 11, 2015 2:16 pm

Ok found it and email sent! :thumbup:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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