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#70311 12/19/2006 2:55 AM | Joined: Aug 2006 Posts: 31 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2006 Posts: 31 | Got the 261 in my '53 3/4 T. with T-5, but still have a miss as RPM's increase. Have replaced fuel pump, coil, points, condenser, rotor, fuel filter--also now a new rebuilt carb. Checked fuel lines--I'm beginning to suspect that new fuel pump may be bad??
I've read past posts concerning same kind of problem--any suggestions? | | |
#70312 12/19/2006 2:58 AM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | tk261,
As you troubleshoot, don't forget that the valvetrain figures into this equation too.
Stuart | | |
#70313 12/19/2006 3:45 AM | Joined: Feb 2005 Posts: 199 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2005 Posts: 199 | Make sure the vacuum advance on the distributor is working and that you don't have any vacuum leaks.
I worked on my 261 several hours for the same issue only to discover that the vacuum advance was shot.
Hobert
"The Lord is my shepherd"
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#70314 12/19/2006 3:46 AM | Joined: Oct 2006 Posts: 843 Shop Shark | | Shop Shark Joined: Oct 2006 Posts: 843 | You didn't mention plug leads of plugs.I put AC spark plugs in my 350 once.At least one misfired at freeway speed.Replaced them with the Autolite that I usually ran.Problem solved | | |
#70315 12/19/2006 3:54 AM | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | I once had a Pontiac that did that. Turned out to be a small crack in the distributor cap. | | |
#70316 12/19/2006 9:38 PM | Joined: Apr 2006 Posts: 234 'Bolter | | 'Bolter Joined: Apr 2006 Posts: 234 | Since they're not on your list, vacuum advance and distributor cap. Based on your description, I would lean towards the vacuum advance first, but the distributor cap is easy enough to check/fix, so half a dozen of one six of another.
58 Fleetside, 235, "The Old Buckin' Bronco"
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#70317 12/19/2006 9:58 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Just out of curiosity, how do you suppose a faulty vacuum advance unit would cause the engine to miss as it was brought up in RPM's. If the diaphragm were leaking, the vacuum advance would be "faulty", but it would now be classified as a vacuum leak wouldn't it. Will a vacuum leak make a engine miss at higher speeds? I don't see the correlation between the vacuum advance and a miss. If one were to pull the vacuum line and block it at the carburetor and the miss disappeared, case closed! I don't think this would happen. But as many can attest to, I have eaten my fair share of CROW before!  Stuart | | |
#70318 12/20/2006 1:22 AM | Joined: Feb 2005 Posts: 469 Shop Shark | | Shop Shark Joined: Feb 2005 Posts: 469 | You might give the fuel pump a second chance and check your tank and lines for blockage and make sure the parts store gave you the correct fuel pump. Also check and make sure you have the correct dwell setting on the new points and make sure the coil is not wired backward and the fireing order is correct. | | |
#70319 12/30/2006 4:48 PM | Joined: Feb 2005 Posts: 199 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2005 Posts: 199 | This is a very good explaination of vacuum advance and its relation to correct timing in relation to a correct timed engine under load. HERE- http://www.classicchevytrucks.20m.com/vacuum.htm In my case the vacuum advance had a busted diaphram ( I took it apart) which I theroized caused the engine to be "out of time" under load. Hope this helps.Hobert
"The Lord is my shepherd"
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#70320 12/31/2006 2:45 AM | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | In addition to all the above how about the distributor shaft bearings and gear? A worn out distr. wreaks havoc on timing. Maybe a good time to upgrade to HEI? Good luck. | | |
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