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Unread 10-15-2008, 01:14 PM   #1
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Default distributor 180 out?


I own a carburated 4.3 v6 and recently swapped my MSD mechanical advance distributor (fuel mileage reasons) to a stock HEI. I'm running an MSD box as well.

I cant get it to idle and I'm wondering if its 180 degrees out. My knee jerk reaction would be that it wouldnt run at all if it was 180 out, REALLY bad.....

I have a feeling its a vacuum leak but wanted to ask the forum first....


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Unread 10-15-2008, 04:33 PM   #2
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sounds like a vacuum leak or the timing is way off.. usually if it's 180 out it wont crank or if it does it runs super rough..

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Unread 10-15-2008, 06:12 PM   #3
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you probably have it 1 tooth off this will cause poor idling but still run. pull the ditributor again and set cylinder one to top dead center then the distributor rotor must face cylinder one on this engine the real trick is identifying compression stroke or exhaust stroke that I couldn't tell you but some one else will probalby chime in soon who can. Oh and remeber to check and recheck when stabbing a distributor it's hard to get the position right sometimes sinse the gear turns the rotor while stabbing.

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Unread 10-15-2008, 06:31 PM   #4
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Compression stroke vs. exhaust stroke can be determined by putting your finger over the spark plug hole while turning the engine over. When the most pressure builds up, that is the compression stroke, and you set your distributor to fire at that point.

I don't know if you tried this already, but you should try playing with the timing while the engine is running.

Oh, and did you plug the vacuum line that used to be connected to the mechanical advance distributor?
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Last edited by apavlov13; 10-15-2008 at 06:35 PM.

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