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#17656 06/12/2004 6:30 PM | Joined: Sep 2000 Posts: 390 Shop Shark | | Shop Shark Joined: Sep 2000 Posts: 390 | Iput new points in my 235,changed the wires,check the gap 3 times.Its set at .019.It starts right up andsounds good at idle but runs rough at high rpms.What have i done wrong.i checked and rechecked the fireing order.Ive sinse lowered the points to .018,still rough at high revs.Also tried a different rotor.
1942 1\2 Ton 1951 1\2 Ton 55 willys cj-5 1954 and 59 Cushman Scooter 1960 Biscayne Sedan 1965 G/10 panel van 1966 C/30 Grizzly Motorhome You know you're a 'Bolter when your daily driver is older than you are... My progress pics | | |
#17657 06/12/2004 8:09 PM | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | Check the ignition timing. a 1 degree change in dwell (determined by the point gap) changes ignition timing 2 degrees. You might have it over-advanced at high RPM.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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#17658 06/12/2004 9:25 PM | Joined: Mar 2001 Posts: 316 Member | | Member Joined: Mar 2001 Posts: 316 | Bushings may be "gone" in your dizzy, causing your dwell to vary wildly.........check with engine running and meter connected. Idle dwell may look okay, but increase RPM's to see if the meter starts to fluctuate. This is a common problem on old or highmileage engines. If you don't have a dwell meter, borrow one..........either that, or pull the dizzy out, put it in a "soft-jaw" vise and check for lateral play and excessive run-out in the bushings. Distributor can be rebuilt or just find one that isn't as worn. Also, how worn down is the cam that opens the points? If it's worn down enough it will not run well above an idle. Lack of coil saturation. These are only suggestions and are only worth what you paid for them   .
*** GMC ***
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#17659 06/12/2004 9:43 PM | Joined: Sep 2000 Posts: 390 Shop Shark | | Shop Shark Joined: Sep 2000 Posts: 390 | All of the problems started after i fixed it :DThis engine has run great for the last year.I had the distributor out and it seems ok.The advance is working.After it didnt start a week ago i checked all electrical conections and put in new points.Moveing the distributor doesnt get rid of the problem.
1942 1\2 Ton 1951 1\2 Ton 55 willys cj-5 1954 and 59 Cushman Scooter 1960 Biscayne Sedan 1965 G/10 panel van 1966 C/30 Grizzly Motorhome You know you're a 'Bolter when your daily driver is older than you are... My progress pics | | |
#17660 06/12/2004 11:36 PM | Joined: May 2001 Posts: 1,904 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,904 | My old 235 starting missing at higher RPM's such as just before shifting to the next gear. I cleaned out the hardened grease in the grease cup on the distributor and put new grease in it. That solved my problem.
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
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#17661 06/13/2004 1:24 AM | Joined: Sep 2000 Posts: 390 Shop Shark | | Shop Shark Joined: Sep 2000 Posts: 390 | Turns out the spare part...was the spring and with out it the points were floating. :rolleyes: Back to running smooth.
1942 1\2 Ton 1951 1\2 Ton 55 willys cj-5 1954 and 59 Cushman Scooter 1960 Biscayne Sedan 1965 G/10 panel van 1966 C/30 Grizzly Motorhome You know you're a 'Bolter when your daily driver is older than you are... My progress pics | | |
#17662 06/13/2004 2:03 AM | Joined: Mar 2004 Posts: 313 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 313 | Hey Slow rider,
I recently placed a new 235 into my 49 Chevy truck, and when we got it running, it did the same thing. I did all the same things you did, and just couldn't figure out why it missed when we reved up the engine. The coil was the only thing I hadn't replaced. I put a new coil on it, and it solved the problem. Just a thought!
KT
1949 5 window 3/4 ton
1953 3100 with 1957 235, T5 and 12 bolt 373 rear
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