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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Bouncing Tach
My tach has been working fine for the last month or so but now it bounces all over the place. I thought this might be a bad ground but it seems to be fine. I attached it directly to the neg battery terminal and it's doing the same thing. Any ideas?
Thanks.
_________________ Sold: 1970 w/427W Injected Stroker
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Sun Jun 19, 2011 7:00 pm |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Could be a sign of a problem in the distributor. What type of ignition do you have?
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Sun Jun 19, 2011 7:47 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
It's whatever was OEM on the 1970 year. The dizzy is a new Mallory model.... http://www.amazon.com/gp/product/B000FVZHTSIn the last year I've installed: New battery New Flamethrower coil New plugs/wires New solenoid Has the original voltage regulator and alternator. This just started happening about a week ago.
_________________ Sold: 1970 w/427W Injected Stroker
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Sun Jun 19, 2011 8:03 pm |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
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Mon Jun 20, 2011 12:06 am |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
So from those procedures, the point gap for a 27 series should be .022 for the dual-point? I'm not sure how to adjust this but I'll do some research. Thanks. This seems to be a pretty good writeup.... http://thecareandfeedingofponies.blogsp ... butor.html
_________________ Sold: 1970 w/427W Injected Stroker
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Mon Jun 20, 2011 8:40 am |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Yep. You need to get one rubbing block on the peak of the cam then adjust that one only. Then turn the motor slightly to get the other rubbing block on the peak and adjust that one. It's twice as complicated with dual points.
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Mon Jun 20, 2011 1:24 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
So to be clear, I use the feeler gauge between the felt pad and the cam lobe? That's what should be .022? Thanks.
_________________ Sold: 1970 w/427W Injected Stroker
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Thu Jun 23, 2011 9:45 am |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
No. the feeler gauge goes between the point contacts when they are all the way open.
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Thu Jun 23, 2011 3:08 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Ok, so I checked the points, they were right on at .022. Then I checked the timing, it was off so set it back to 11. Then I changed the ground on the tach and also replaced the coil to dizzy wire. The tachometer still bounces.
One more thing now, it's running really rough, stalling and almost impossible to start without flooring the throttle after waiting 10 minutes. I'm going to change the fuel filter again but I'm now thinking it may have something to do with the mixture screws on the carb? It smells of gas horribly but there are no leaks.
Thanks.
_________________ Sold: 1970 w/427W Injected Stroker
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Fri Jun 24, 2011 7:39 pm |
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Moab Mike
Official CCB Member
Joined: Mon Jan 03, 2011 2:59 pm Posts: 1940 Location: Witness Protection Program
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
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Fri Jun 24, 2011 8:05 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
I checked the plugs and they looked ok. They are pretty new.
_________________ Sold: 1970 w/427W Injected Stroker
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Fri Jun 24, 2011 8:21 pm |
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Shawns Fords
Official CCB Member
Joined: Sat Oct 02, 2010 7:36 pm Posts: 779 Images: 0
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
I would say the coil could be going bad. Its nice to have a known good working coil to swap out and verify. Do you have an ignition ballast on the coil circuit or the resister wire? Check all of your wiring connections and verify they are making good connections.
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Fri Jun 24, 2011 8:26 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Well, the coil is 6 months new also...but I guess it could be bad. No ignition ballast that I know of. What would that look like?
_________________ Sold: 1970 w/427W Injected Stroker
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Fri Jun 24, 2011 8:28 pm |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
The hard starting after shutdown is most likely fuel boiling in the carb. Might need a little tweeking on the mixture screws too with this warm weather. Neither of those will affect the tach though.
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Fri Jun 24, 2011 10:51 pm |
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Shawns Fords
Official CCB Member
Joined: Sat Oct 02, 2010 7:36 pm Posts: 779 Images: 0
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
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Sat Jun 25, 2011 10:20 am |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Thanks guys. I'm going to replace the fuel filter again and mess with the mixture screws. Still baffled on the bouncing tach.
If the tach to coil wire is in close proximity to any other wires....battery, plugs, alt. etc. could this cause issue?
Thanks
_________________ Sold: 1970 w/427W Injected Stroker
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Sat Jun 25, 2011 10:38 am |
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Shawns Fords
Official CCB Member
Joined: Sat Oct 02, 2010 7:36 pm Posts: 779 Images: 0
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
you could be getting a cross signal if there is enough amps going through the other wires. Or if there is a fray in one of the wires.
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Sat Jun 25, 2011 11:31 am |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Or if it was running parallel to a plug wire.
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Sat Jun 25, 2011 10:44 pm |
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Booger
Official CCB Member
Joined: Thu Dec 23, 2010 6:55 pm Posts: 809 Location: Broomfield
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
What about a condenser problem?
_________________ Bob - Turning hydrocarbons into noise since 1970
Spiritual owner of the now Zoso mobile (1974 Bronco Ranger - EFI 351W-4R70W-ARB front and rear-STC softtop- High Country hood-3 1/2" WH lift- Cross inboard rear shock mnt- Duffs bumpers- Warn 8274- 33's- Cheby disc conversion)
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Sat Jul 02, 2011 7:45 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
The condenser I'd that cylinder on the outside of the dizzy right? It's new.....but it could be bad I imagine.
_________________ Sold: 1970 w/427W Injected Stroker
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Sat Jul 02, 2011 9:48 pm |
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Booger
Official CCB Member
Joined: Thu Dec 23, 2010 6:55 pm Posts: 809 Location: Broomfield
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
_________________ Bob - Turning hydrocarbons into noise since 1970
Spiritual owner of the now Zoso mobile (1974 Bronco Ranger - EFI 351W-4R70W-ARB front and rear-STC softtop- High Country hood-3 1/2" WH lift- Cross inboard rear shock mnt- Duffs bumpers- Warn 8274- 33's- Cheby disc conversion)
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Sun Jul 03, 2011 8:49 am |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
How else would a bad condenser show itself?
_________________ Sold: 1970 w/427W Injected Stroker
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Sun Jul 03, 2011 8:54 am |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
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Sun Jul 03, 2011 11:21 am |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Sounds good....will pick one up at Advance soon. Thanks guys.
_________________ Sold: 1970 w/427W Injected Stroker
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Sun Jul 03, 2011 12:48 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
New coil fixed both the bouncing tach and the stalling/stumbling problems! My old coil was only 1 year old.
_________________ Sold: 1970 w/427W Injected Stroker
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Fri Jul 15, 2011 8:45 pm |
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cobshane
Official CCB Member
Joined: Sat Nov 13, 2010 12:31 am Posts: 516 Images: 1 Location: littleton
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
You never know what's going to happen with aftermarket junk!
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Fri Jul 15, 2011 10:35 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Well, the bouncing tach is back again. I can't figure it out. It was fine for about 3 days after I put the new coil in, then all of a sudden it starts bouncing again and the bad performance is back. The new condenser should be here today so I'll try that. It's getting annoying.
_________________ Sold: 1970 w/427W Injected Stroker
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Tue Jul 19, 2011 11:52 am |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
_________________ Sold: 1970 w/427W Injected Stroker
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Tue Jul 19, 2011 12:16 pm |
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ZOSO
Moderator
Joined: Mon Nov 15, 2010 5:58 pm Posts: 3906 Location: Henderson, Co
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
Ditch the points and go with a oem electronic ignition.
_________________ Rob
74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.
04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine
New project: 77 Bronco Ranger, body work and more body work.
Very little left of a 72 durango tan explorer sport
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Tue Jul 19, 2011 12:20 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Bouncing Tach
_________________ Sold: 1970 w/427W Injected Stroker
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Tue Jul 19, 2011 12:35 pm |
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