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Old 11/16/10, 04:04 PM   #1
br0nc0xrapt0r
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Engine losing power cutting out **fixed**

Yesterday it was fine today it starts and idle's/revs fine. but as soon as you put it in gear and take off it cuts out and then surges forward like it's catching up. Its a 351M C6 in a 78 bronco, I changed the fuel filter and tried running it with no air cleaner and no change at all. I want to check the hei dizzy but don't have enough time I gotta go back to work.

any ideas?

Last edited by br0nc0xrapt0r; 11/30/10 at 03:33 PM..

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Old 11/16/10, 06:11 PM   #2
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Check for a loose coil wire... Had one of the factory friction connectors get loose on me, and just the wire moving under accel/decel would cause it to stall/start. Felt like the float levels were low, and it was sloshing /starving. Good luck
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Old 11/16/10, 11:19 PM   #3
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Check to see if the accelerator pump is working. Also check the vacuum line to the modulator and the tranny.

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Old 11/17/10, 10:46 PM   #4
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Working in the dark still. I may have found about 40 vacuum leaks but no massive improvement, hopefully I'll get the weekend off and I can fix it.

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WTB pulley cover for 1959 Homelite 9-23
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Old 11/18/10, 06:56 AM   #5
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Quote:
Originally Posted by cwcorbin View Post
Check for a loose coil wire... Had one of the factory friction connectors get loose on me, and just the wire moving under accel/decel would cause it to stall/start. Felt like the float levels were low, and it was sloshing /starving. Good luck
HEI has no coil Well not the kind I think your talking about?

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Old 11/19/10, 11:10 AM   #6
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Is it possible that the mech fuel pump is dying? it now doesnt even want to rev but still idles fine.

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69 Exxon Valdez, 37" locked front and rear, Daily driver.
http://classicbroncos.com/forums/sho...d.php?t=163762

WTB pulley cover for 1959 Homelite 9-23
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Old 11/19/10, 11:34 AM   #7
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Entirely possible. Most compression testers will read fuel pressure too.

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Old 11/21/10, 07:18 AM   #8
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I just had a similar issue...I went through and replaced all the plugs and wires and it's disappeared for now. Sounds like you've already covered that though.

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Old 11/21/10, 12:49 PM   #9
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Quote:
Originally Posted by br0nc0xrapt0r View Post
Is it possible that the mech fuel pump is dying? it now doesnt even want to rev but still idles fine.
I've seen symptoms where it idles but won't rev, turned out to be a bad coil. The coil had enough strength to idle but couldn't handle the demand of current for increasing RPM's. Coils are cheap, good to carry a spare also.
Mark

EFI, OBDII, 5.0
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Old 11/21/10, 04:10 PM   #10
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Quote:
Originally Posted by garberz View Post
I've seen symptoms where it idles but won't rev, turned out to be a bad coil. The coil had enough strength to idle but couldn't handle the demand of current for increasing RPM's. Coils are cheap, good to carry a spare also.
Mark
I'm really scared of that since it's an HEI unit. I replaced the fuel pump with little to no improvement and also checked cap and rotor things seem to be in order.

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WTB pulley cover for 1959 Homelite 9-23
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Old 11/21/10, 05:13 PM   #11
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is there a way to have the coil tested?

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69 Exxon Valdez, 37" locked front and rear, Daily driver.
http://classicbroncos.com/forums/sho...d.php?t=163762

WTB pulley cover for 1959 Homelite 9-23
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Old 11/21/10, 08:35 PM   #12
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Quote:
Originally Posted by br0nc0xrapt0r View Post
is there a way to have the coil tested?
At this point, I would just buy another one and see if it solves your problem. If it doesn't, at least now you have a spare.

EFI, OBDII, 5.0
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Old 11/21/10, 09:02 PM   #13
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Quote:
Originally Posted by garberz View Post
At this point, I would just buy another one and see if it solves your problem. If it doesn't, at least now you have a spare.
Touche but I am trying to sell said bronco, it eats up too much funding for the 69. I don't really want to but another dizzy and find out thats not the problem. what else could it be?

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69 Exxon Valdez, 37" locked front and rear, Daily driver.
http://classicbroncos.com/forums/sho...d.php?t=163762

WTB pulley cover for 1959 Homelite 9-23
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Old 11/21/10, 09:16 PM   #14
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Should be a spec for testing the coil with an ohm meter. Maybe someone here knows what the GM spec is?
Is it a standard coil as far as you know, or is it an updated aftermarket one? What brand is the distributor?

Paul
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Old 11/21/10, 09:36 PM   #15
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No clear markings on it, this is what it looks like. Perhaps it's an ebay special.
Attached Images
File Type: jpg IMG_2293.jpg (95.4 KB, 18 views)
File Type: jpg IMG_2292.jpg (88.2 KB, 16 views)
File Type: jpg IMG_2291.jpg (90.7 KB, 16 views)

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69 Exxon Valdez, 37" locked front and rear, Daily driver.
http://classicbroncos.com/forums/sho...d.php?t=163762

WTB pulley cover for 1959 Homelite 9-23
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