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Mac1978
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Joined: June 25, 2009
Posts: 20
Location: Winchester , KY
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 Posted: Thu Apr 12, 2012 10:48 am Post subject: Thing running poorly |
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| Hopefully one of you knows exactly whats wrong... After approx 10 miles, the thing began to stumble under a load and pop and backfire a bit. It seemed like it was worse going up hills etc. where it was pulling more vacuum. Now, its hard to start and you have to work to keep it running. Nothing was changed, and its never acted up before. It has a pertronix ignition, and maybe 500 miles since tuneup. Ignition? air leak? fuel? Any help would be greatly appreciated! |
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[email protected]
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Joined: July 06, 2011
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GI Joe
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Joined: April 28, 2005
Posts: 779
Location: E.TN
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| Posted: Thu Apr 12, 2012 1:55 pm Post subject: |
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Maybe some crap in the idle jet? Or the idle cutoff solenoid gone bad.
I'd start there, then check the intake boots for an air leak.
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wbrown45
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Joined: July 08, 2008
Posts: 1100
Location: ada, ok
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| Posted: Thu Apr 12, 2012 2:17 pm Post subject: |
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| GI Joe wrote: | Maybe some crap in the idle jet? Or the idle cutoff solenoid gone bad.
I'd start there, then check the intake boots for an air leak. |
These are two very good possibilities. What kind of carburetor do you have?
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Mac1978
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Joined: June 25, 2009
Posts: 20
Location: Winchester , KY
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| Posted: Thu Apr 12, 2012 3:43 pm Post subject: |
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| Its a Weber. I tried a little carb spray around the intake boots. |
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Pandion
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Joined: April 05, 2012
Posts: 23
Location: Panama City Beach, FL
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| Posted: Fri Apr 13, 2012 6:20 am Post subject: |
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| I would look at everything that was touched at the tuneup. Particularly plugs and plug wires. It seems like something left off at the tuneup would have shown itself by now, but something like an improperly torqued spark plug could take a little while to present itself. |
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ethierbach
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Joined: November 07, 2010
Posts: 19
Location: Ann Arbor, MI, USA
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| Posted: Fri Apr 13, 2012 8:27 pm Post subject: |
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| Pandion wrote: | | I would look at everything that was touched at the tuneup. Particularly plugs and plug wires. It seems like something left off at the tuneup would have shown itself by now, but something like an improperly torqued spark plug could take a little while to present itself. |
Maybe check the timing as well. If the clamp worked a bit loose, the distributor might have rotated a little. |
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MikeinTN
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Joined: April 13, 2012
Posts: 14
Location: Lebanon, TN
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| Posted: Fri Apr 13, 2012 9:18 pm Post subject: |
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| I'd lean toward fuel. Unless you changed something with spark (timing, plug dwell/gap, wire deviations). Filter, bad gas, etc... Fill er up with good gas, wait a minute, and go. |
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Wildthings
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Joined: March 13, 2005
Posts: 19983
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| Posted: Fri Apr 13, 2012 11:08 pm Post subject: |
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When the engine is warm and you pop the air cleaner off is the choke closed or partially closed?
How warm or cold is the manifold below the carb? Spring is prime icing season in the dank southeast. Do you have the tubes that connect the bottom of your intake manifold to the exhaust on each side? Carburetors need base heat to work well. Preheated intake air is a plus as well, I bet you have neither. |
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lukesky
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Joined: July 12, 2006
Posts: 245
Location: See The Rabbits, IA
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| Posted: Sat Apr 14, 2012 10:12 am Post subject: |
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I always have trouble with the automatic fuel cutoff switch coming loose. That causes some air bypass and it dies a lot. Unlike yours, though, it always started right away, but it was hard to keep it going. I would make sure everything's nice and tight.
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Mac1978
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Joined: June 25, 2009
Posts: 20
Location: Winchester , KY
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| Posted: Sun Apr 15, 2012 11:27 am Post subject: |
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| Its not carb ice. Im leaning towards coil/pertronix failure |
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doublecanister
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Joined: September 23, 2008
Posts: 528
Location: Richmond, Va
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| Posted: Mon Apr 16, 2012 11:04 am Post subject: |
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| Mac1978 wrote: | | Its not carb ice. Im leaning towards coil/pertronix failure |
Hey Mac1978, I too had a "Pertronix II" module fail on me, was on my 66 Mustang, but it never ran poorly, the sign I was seeing was hard to start, once started, ran great, just wouldnt start every time, just crank and crank and spit and crank. Then nothing. almost left me brokedown at a car show!
I believe I Killed it by leaving the key on for a extended period of time working on interror lights. (which ironicly the pertrox II was supposed to be protected against).
Just my 2 cents here, It very well could be the pertronix, the only way to really tell is process of elimination.
Replace it back to points and test,
or
put in a spare pertronix. (which most folks dont have).
Unfortunatly all the suggestions could be the culprit, as I've recently revived a 51 ford pickup that sat for 20 years, it's gotten better on each test run, but it ran like crap when it first fired, pleanty of good gas, some seafoam, some marvel mystery oil and a good cleaning of the spark plugs, points, dwell reset, have all helped.
keep at it you'll find the culprit.
Other suggestions, try a vaccume guage, it may help with diagnosis, I got a 1man brake bleeder kit from Pepboys, for brake bleeding, it also doubles as a vaccume guage, used it for setting the 51's carb and identifying it's other issues, you can info on how to read a vac guage online (I googled it).
Good luck and stay at it you'll fix it and these Samba guru's will help!
T
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