Rich running 262 head scratcher
I have a 49 with a 262 2 bbl carb. Cyls 2, 4 and 6 appear to be running normal. 1, 3 and 5 however are running very rich and are carbon fouled. Car runs decent but idles just a bit rough when low.
Plugs are Champion J8C gapped at 32. WD-O Carb recently rebuilt. mixture screws are 1 and 1/8 out.
Anyone have any thoughts?
Plugs are Champion J8C gapped at 32. WD-O Carb recently rebuilt. mixture screws are 1 and 1/8 out.
Anyone have any thoughts?
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Comments
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A cyl compression test should be done - a vacuum gage could also be helpful. Good luck.0
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Vacuum leak in manifold? Spray around intake , and underneath.
Be careful around the hot exhaust.0 -
Courtesy Man said:A cyl compression test should be done - a vacuum gage could also be helpful. Good luck.
Thanks0 -
I've had good success with an UN-LIT propane torch. The propane gas will definitely change the idle if sucked into a leaky manifold. Works great on FI cars with hard to access intake runners.0
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Seems strange that only the odd cylinders are impacted. There may be a clue in the firing order 153624 and the affected cylinders. I wonder if one side of the distributor is not firing as strongly ? I would suggest checking that the distributor cap is sitting properly and also checking for a bent dustributor shaft. Or possibly looking fir a crack in the distributor cap near leads 1,5,3. Hope this helps.0
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It's obvious that one throat is delivering more fuel than the other. Nothing to do with ignition. You can't just set the idle mixture screws at a determined position, you have to individually tune them. Check the metering pin actuation and the jets in the bottom of the bowl.0
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Geoff said:It's obvious that one throat is delivering more fuel than the other. Nothing to do with ignition. You can't just set the idle mixture screws at a determined position, you have to individually tune them. Check the metering pin actuation and the jets in the bottom of the bowl.0
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superwasp said:I've had good success with an UN-LIT propane torch. The propane gas will definitely change the idle if sucked into a leaky manifold. Works great on FI cars with hard to access intake runners.
There is one vacuum line from the intake manifold to the passenger side of the wiper motor. On the driver's side of the wiper motor there was no vacuum line either plugged or attached to wherever it goes to. So I ran a short line and stuck a golf tee into it. No change in idle.
BTW what does that driver's side vacuum line connect to ?0 -
There should only be one vacuum hose to the wiper motor.0
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54coupe said:There should only be one vacuum hose to the wiper motor.0
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I’ve never seen a second port, maybe put a rubber plug on the second one if you’re getting a vacuum leak, not sure0
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cheyenne7271 said:I’ve never seen a second port, maybe put a rubber plug on the second one if you’re getting a vacuum leak, not sure0
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I wonder if this second hose goes to the wiper switch for the windshield washer? I've never had a Hudson with that feature, so I'm guessing now.0
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oh oh that makes sense, I guess the washer uses vacuum to move the fluid0
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So with no vacuum issues found looks like I'm back to carburation making 1,3 and 5 run rich and 2,4 and 6 run normal. Back to Geoff's concept of one barrel adjusted richer than the other but does one barrel control the gas flow to 1,3 an5 and the other to 2,4 and 6 ?0
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One side feeds 1,2,3 and the other 4,5,60
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Outside for front and inside for rear.0
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