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Old 05-24-2000, 09:33 PM
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My 1975 230 4 cylinder is supposed to be set at +10 degrees. At that setting it backfires out the intake when I first start up. At +25 degrees it starts up without backfire. What is the highest setting I can use and what will this cause?
I have switched to a electronic ignition setup.
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Old 05-24-2000, 09:55 PM
Larry Delor's Avatar
What, Me Worry?
Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,112
Upon reading your post, the first thing that came to my mind is that maybe your valve timing is a little late. (experts will surely tell me and you if I am completely off track). But, as far as iginition timing goes, if your not sure...listen to what your engine tells you...does it ping even upon light acceleration? if so, retard. If it pings just a hair upon heavy acceleration, leave it be. How does your new ignition determine when to advance the timing anyway? vacuum? if so, maybe a thermally motivated vacuum valve could be the culprit.
-just taking an amateur stab at it

03/83 300D 184k
07/73 280 160k
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