Posted by Sparks on January 25, 1999 at 11:01:32:
In Reply to: Re: And, as added insurance... posted by Ron S. on January 22, 1999 at 22:37:20:
I must be making this hard on myself.
I used the "one at a time" method when changing the plugs and wires, but that doesen't mean they were right to begin with.
I appreciate the firing order info. Now, how are the cylinders numbered? I want to make sure I get this info from the Maverick board.
May seem like a stupid question, but my last mav was a straight 6, and the only other engine I work on is a 2 cyl bike.
: Route the #7 and #8 plug wires as far away from each other as possible (not side by side). This will ensure there is no "crossfire" between these consecutively firing cylinders! (1-5-4-2-6-3-7-8, and YES I do know it by heart!!! ;-)
: : A '73 Maverick 302 uses a Motorcraft BRF-42 plug, although other brands may use a different part number. These should be easy to cross-reference in the book at the parts store. Are you SURE you have the correct firing order. Check it again, it shouldn't be backfiring...
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: : : I decided to start over again from the beginning and retrace my steps. Spark plugs are cheap so I went to buy 6 more(had 2 new). I had just bought a straight replacement for the one in my hand last time. It never occured to me to do what I always do in carpentry NEVER trust the last worker's measurements. The ones I bought today (all 8) are autolite 45's.
: : : The ones in the engine now are 46's. I hope that this has been my problem all along. It seems the last mechanic used what he had and then decreased the gap. I'll post an update on Monday.
: : : 1973 302 V8 2bbl. Any further comments on the plug situation? T.L. what do you think? Could this be the culprit(s)?
: : : BTW, I did cap off the EGR valve and its related vacuum hose.Removing the valve is a little more involved that I can do right now. I did not notice any change, but I'm hoping the plug change will allow me to move on to better things.