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Old 12-09-2008, 12:00 PM   #1 (permalink)
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Timing issues

Hello all,
Thought I'd see if there is any advice to be given on this one.

78 K10 350

My truck ran great when I first got it a few years back. About a year ago when I took it off the road it ran like total crap.
I replaced the extremely worn timing chain and cogs.
Timed it and it still bogs under load and back fires.
I figured I had better replace the vacuum advance as well as it doesn't seem to be advancing when it should so that what I did today. Then timed it again. I checked the vacuum port on the Q-Jet as well and it pull vacuum when it needs to.
Its much better but far from perfect/the condition it was in when I got it. I can get it up to 4K without much problem but still get some hesitation and the occasional backfire. The last thing I can really think or would be the cap and rotor. I replaced them close to a year and a half ago. When I popped them off the brass was somewhat corroded.
Its just about 0 degrees here... I wish the truck would fit in the garage
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Old 12-09-2008, 12:35 PM   #2 (permalink)
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Replace the cap & rotor. At the very least,
you'll eliminate them as the cause.

Keep us posted.
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Old 12-09-2008, 02:11 PM   #3 (permalink)
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Check/replace all the usual. Plugs, wires, cap, rotor.

If this motor is old(er) I'm gonna bet you got a burnt exhaust valve or flat cam lobe.

Or both.
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Old 12-09-2008, 04:12 PM   #4 (permalink)
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Thanks for the info guys, I'll give it a whirl. I hope its an easy fix now but what can you do
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Old 12-09-2008, 10:47 PM   #5 (permalink)
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As far as timing goes, check your harmonic balancer and make sure the outter ring hasn't slipped. This would cause the timing marks to be off. It sounds like a strange thing to happen but this is exactly what happened to a friend of mines truck.
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Old 12-11-2008, 06:56 PM   #6 (permalink)
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Well a small update,
It's currently 7degrees advanced. I replaced the cap and rotor. It ran much better. I'm going to pick up a coil, plugs and wires tomorrow and check the harmonic balancer... Good call I would have never thought of that.

I dragged something home today for $100.00 tonight though
1990 Suburban 10bolt/Corp14SF 350/Turbo 400

Tranny is blown as well as the rear axle but hell for $100.00..... steal

Here's some pics
http://s463.photobucket.com/albums/q...rdferguson184/
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Old 12-11-2008, 11:08 PM   #7 (permalink)
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another thing to check is the springs on the advance weights in the distributor. I had them break/rust away on me before.
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