Re: '86 Silverado [305 ci] distributor/timing problem

Sounds like the timing is off. When you put the dist. back in the block you were a notch or two off. Pull the dist. again and put no. 1 cyl. on Top Dead Center (TDC). Put dist. back in with rotor pointing
at no. 1 plug wire on cap. Should then be able to start engine and set timing with a timing light or advance it until you get a spark knock on acceleration or kickback when starting, then retard timing until knock or kickback goes away.
Robbie.
On Mon, 4 Aug 2003 17:19:20 -0400 (EDT), snipped-for-privacy@webtv.net (GC) wrote:

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Did it at least start and run before you removed the distributor?? If it did, odds are you put the distributor close, but incorrectly. The spitting through the carb is a sign of a secondary ignition issue. If you HADN'T had the distributor out, I'd say look for a full tune up, vacuum advance being stuck, or possibly the lobes of the cam shaft went flat. Do you have a timing light?? If you do, crank it over and see if your mark on the crank is at least in the neighborhood of Top Dead Center + or - maybe 4 degrees.
Keep in mind if you've done a lot of cranking on a carb'd engine with out starting it, the plugs may be so gas soaked it won't start properly either..
Hope this Helps
Nick

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'86 Silverado [305 ci] distributor/timing problem

Sounds like the timing is waaaaaay off or you may have gotten the wrong distributor module.
****************************************** I would rather be exposed to the inconveninces attending too much liberty than to those attending too small a degree of it. ~ Thomas Jefferson ~
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Thanks a bunch, the info is greatly appreciated... After spendin' half-a-day, of each of the last two days; something dawned on me: the distributor gear isn't symmetrical as I first thought (assumed)... After foolin' around tryin' to figure what I was doin' wrong (or what else the previous owner screwed up), I realized the gear was on 180 backwards... so out came the pin-flipped it 180, pin back in-lined up the OP shaft-dropped 'er in---BINGO, started right up! Now if I can figure out why the computer is retarding the timing, I'll be set!
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Thanks Doc, I never thought about telling the guy how to re-install the distributor. I always line up #1 cylinder before pulling the distributor (provided that I'm not planning to rotate the engine later. To re-install, I use a topless distributor cap, that has #1 marked on it, to line everything up. that way, it should start on the first try.
****************************************** I would rather be exposed to the inconveninces attending too much liberty than to those attending too small a degree of it. ~ Thomas Jefferson ~
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I use an air hammer (operating @ 35psi, thin chisel, one quick blip on the trigger) to etch a notch in both the dizzy base and intake manifold so they line up perfect every time. Has worked thus far and haven't cracked an intake yet! <bfg>
Doc
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Not too familiar with the CCC systems (you do have a Rochester computerized carb right?). Do they utilize an ESC module and/or knock sensor?
Doc
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Thanks Doc... Yes, it has the -dual capacity pump- in the carb, high/low/delay ESC controller/module, Knock sensor, Tip In vacuum switch, and some kinda sensor in the lower left side of block [that I've not figured out yet]. Also haven't figured out what/how controls the carb dual capacity pump... Lucky for me, [as far as I know] it doesn't have a OS, MAP, TPS, etc.
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GC,
If the CCC ECM is anything like the early TBI ECM's, it will retard timing if the ESC module fails the diagnostic self-test (happens each time you start the vehix).
After the engine has reached 195*, the first time you really open her up, the ECM advances the spark curve until it detects knock to "test" the EST system (ESC/KS). If knock is detected, it backs her off a little and all is well. If no knock is detected, it defaults to full retard and sets a code 43.
This can happen for a few reasons. ESC shot, KS shot, or base timing set such that knock cannot be induced. Had this happen to me once; was blowing code 43's left and right, engine ran like shit (full retard, no power), base timing set at spec, which was TDC. Advanced base timing to 4* BTDC (after replacing the ESC and KS didn't help), 43's went away, engine ran like a dream.
Doc
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