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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Bwn_us on February 23, 2017, 06:08:33 pm

Title: 79 350 timing anomaly
Post by: Bwn_us on February 23, 2017, 06:08:33 pm

I am restoring a 1979 C10 with a 350 4bl quadrajet. The timing has been off since I got it. Tried setting to timing line... When on timing line spit and sputtering. Upgraded distributor, same thing. Broke open and replaced timing gears(which the timing marks where on by the way just a tad bit of slacking chain) same thing. Harmonic balancer looks fine..... I'm lost.

Title: Re: 79 350 timing anomaly
Post by: Captkaos on February 23, 2017, 07:03:48 pm

Find TDC and check the marks on the balancer.  They have been known to slip.

Title: Re: 79 350 timing anomaly
Post by: Irish_Alley on February 24, 2017, 07:22:02 am

Quote from: Captkaos on February 23, 2017, 07:03:48 pm

Find TDC and check the marks on the balancer.  They have been known to slip.

this

if youre not sure where to start when it comes to timing its best to start at the beginning remove all your plug wires and find tdc put wires on then double check your wires


http://forum.73-87chevytrucks.com/smforum/index.php?topic=32085.0

Title: Re: 79 350 timing anomaly
Post by: 78BIG-TEN on February 24, 2017, 03:19:47 pm

Some timing tabs were off to the side by p\s pump and some were staight up where you had to look behind water
punp.

Title: Re: 79 350 timing anomaly
Post by: Bwn_us on March 11, 2017, 08:15:15 pm

Thanks for the suggestions. I did timing job done . and new water pump while I was in it, adjusted valves,  and new wires..... Runs better but when 4 barrel kicks in its like a horrible miss. Checked plug colors and they look great. The plugs are only 6 months old but I guess I'm gonna change them. 2 plugs on the right bank and 1 on left blank are flashing blue, not exactly arcing but flashing.

Title: Re: 79 350 timing anomaly
Post by: Bwn_us on March 16, 2017, 03:49:08 pm

So I changed plugs.... Added an additional ground.(there was only one ground strap to passenger side head so I put 00 gauge wire to frame from driver side head) still won't take fuel when 4 barrel opens and even with new plugs and wire still have a plug on each side flashing not arcing like bad plug wires but flashing

Title: Re: 79 350 timing anomaly
Post by: roundhouse on March 21, 2017, 03:32:05 am

Set the timing by a vacuum gauge or just by ear
Drive it hard up a hill
Advance the timing 2 degrees
Run it hard up a hill again
Keep doing that till it starts knocking at full throttle up hill
Then retard timing 2 or 3 degrees


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Title: Re: 79 350 timing anomaly
Post by: gunrac on March 21, 2017, 07:44:33 am

Quote from: roundhouse on March 21, 2017, 03:32:05 am

Set the timing by a vacuum gauge or just by ear
Drive it hard up a hill
Advance the timing 2 degrees
Run it hard up a hill again
Keep doing that till it starts knocking at full throttle up hill
Then retard timing 2 or 3 degrees


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Never heard that before...........but kinda makes since.

Title: Re: 79 350 timing anomaly
Post by: gunrac on March 21, 2017, 07:52:33 am

More I think about this, I have done it similarly, I just didn't have a hill.....lol

Title: Re: 79 350 timing anomaly
Post by: carlnelson on March 21, 2017, 01:46:07 pm

Sounds like all the times it ended up being the distrib cap, would work fine low speeds but upon accel crap out... my cap looked fine but replaced it and miracle! :-/


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