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10-02-2015, 07:51 AM | #1 |
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'36 running bad then good
'36 21 stud stock, dual Fenton with 94's, rebuilt with 3.5 PV and 48 jets. Distributor redone by Skip in Fla., no thermostats. Coil done by Skip a few years ago. At first start up, idles OK...driving runs very rough....like the choke is on, the more acceleration, the worse it runs. I barely make it around the block, shut it off, wait a minute or two....starts right up and runs and drives great. Any thoughts?
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10-02-2015, 09:01 AM | #2 |
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Re: '36 running bad then good
When you indicate "sounds like choke is on" does it smell that way as well ( as it would if choke was on and running very rich?
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10-02-2015, 10:47 AM | #3 |
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Re: '36 running bad then good
How long does the car sit between drives???
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10-02-2015, 01:53 PM | #4 |
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Re: '36 running bad then good
No gas smell when running rough. I checked the plugs...nice tan color. The car will sit for a week....sometimes more, that doesn't seem to make a difference. I went to the So. Cal. open house some time ago...usual scenario as described above. Parked it there, looked around for a few hours, got in to drive home, no problem. It happens only when it sits for a few days...
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10-02-2015, 02:55 PM | #5 |
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Re: '36 running bad then good
I'm NO 94 expert, I can tell you on our 32, every time before we run it we "lightly" tap the carb bowl on the DL carb because the float sticks!!! If you don't it can gush gas out the accelerator pump rod or won't crank at all, if you don't tap the bowl.. Just a thought....again no carb or 94 expert.
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10-02-2015, 02:56 PM | #6 |
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Re: '36 running bad then good
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10-02-2015, 06:31 PM | #7 |
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Re: '36 running bad then good
Just a guess but it sounds like you may have crud in the carb that gets dislodged from the holes it is clogging once it warms up. Taking the carb off and checking all the orifices is not that hard to do. That's where I would start. Good Luck
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10-02-2015, 06:49 PM | #8 |
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Re: '36 running bad then good
X2 what 39topless said. Check inside the hole where the needle valve the float operates. If there's dirt in there your symtoms could occur also if your needle is the type with rubber tip and is breaking down (replace with all metal one with no rubber as alchdohol in fuel breaks down rubber).
If that doesn't do it change your coil. Some times when they are going bad they can give your symtoms until warmed up after sitting a while. Eventually will not run right even after warming up. Coils are weird critters and frequently are bad rebuilt or new.
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10-02-2015, 06:55 PM | #9 |
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Re: '36 running bad then good
Sounds like not enough choke when motor is cold.
do you use choke until motor warms up?
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10-02-2015, 08:48 PM | #10 |
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Re: '36 running bad then good
Are you running progressive or direct throttle linkage?
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10-02-2015, 09:04 PM | #11 |
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Re: '36 running bad then good
Too much gas for the engine. What kind of vacuum are you getting? Is this a stock motor?
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10-03-2015, 11:57 PM | #12 |
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Re: '36 running bad then good
Thanks for all the help....blew out carbs when I rebuilt them....I'll do it again....all metal needle, polished it with 2000 grit, plus, I use MMO in the tank, I don't think it's sticking....I'll check....Direct linkage....When first start, I use the choke, doesn't seem to make a difference when I drive....Stock engine....I'm sending Skip another coil...
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10-03-2015, 11:59 PM | #13 |
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Re: '36 running bad then good
Vacuum at idle bounces between 15-17.....
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10-04-2015, 02:25 PM | #14 |
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Re: '36 running bad then good
Voltage drop .Set up a wire with alligator clips and run it direct to resistor trial (1) .next test ruin it direct to the coil ,if things improve then look for a voltage drop in the ING switch, bad join etc. .Ted
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10-04-2015, 09:21 PM | #15 |
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Re: '36 running bad then good
How old is your gasoline? I had some year old gasoline in my tank which was causing symptoms similar to what you describe. I got rid of the old gasoline put in new, and treated the system for moisture. Problem gone!
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10-05-2015, 07:19 AM | #16 |
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Re: '36 running bad then good
Fresh gas... I drive it once a week...I need time to try all the suggestions and I'll report back....Thanks to all!
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10-05-2015, 01:28 PM | #17 |
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Re: '36 running bad then good
Highly fluctuation of the vacuum gauge needle maybe indicates a valve sticking.
Then, after running frees up? Just a thought |
05-23-2016, 11:30 AM | #18 |
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Re: '36 running bad then good
Found the issue and wanted to report back. Bad condenser. When the condenser got hot, it ran better. Thanks for all the tips, found in an old thread someone had a similar problem......
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05-23-2016, 11:54 AM | #19 | |
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Re: '36 running bad then good
Quote:
Phil |
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05-23-2016, 03:07 PM | #20 | |
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Re: '36 running bad then good
Quote:
when the condenser got hot??? if that's the case it's the first one I ever heard of. They all break down when hot. G.M.
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