I just rebuilt, rings - bearings - valve job ect, a 289 motor, installed it into the car and went to start it,
has backfires thru the carb, checked timing with a timing light while engine cranks and timing is good
so i assume that must mean the dist is in the right setting, the points appear correct so its either
the 4100 type 4bl carb that has been sitting for years is screwed up or I somehow got the
cam set up wrong I tried to line a dot on the upper timing gear with the woodruf key pointing up
on the cam shaft, but the "how to rebuild your engine book" showed the eccentric cam that
runs the fuel pump having the detent in it pointing down towards the woodruff key.
mine did not line up that way...Need some help on what to do..thanks Bob
1965 Mustang Convertible - Driver
1966 Mustang Fastback - Shelby Clone Project car
Either your distributor is 180 degrees out or your cam is a 302 late model cam. Sometime around 1983 or so, the firing order on the 302's was changed. My engine was recently rebuilt and the shop ordered the later model cam. I built the engine and once I tried to start it up, it backfired out the carb. Once I went back and saw the part number of the cam they ordered, I relized the firing order was different. I redid the plug wires to the new firing order and it started right up...
You didn't state that you changed the distributor, so it will be assumed that it is the old dizzy you had on the car when you tore it down. Most likely you are 180 degrees out, so take your dizzy out and turn it around. After you get the car started, you can adjust the timing. You can't do that unless the car is running. Then adjust your points, then go back and re-adjust your timingl.
Sorry, I'm not sure I understand how you set your cam? Did you align the the timing marks? Are you just saying the key was off compared to the book? Oh, did you replace any of the cam, timing chain or gears? Its possible the timing is off but you can verify it is the ballpark by removing the valve cover and watching the valves on #1 as you turn the engine (by hand) to TDC . No offense but you might also want to check that the valves are not set too tight and are closing completely.
If you lined up the marks on the timing gears correctly, the position of the fuel pump eccentric makes no difference.
My vote is for something simple, like wrong firing order, or crossed spark plug wires. Easy to check and fix, best to start there.
If you timed it while cranking, I doubt the distributor timing is too far out (for you unbelievers, that's exactly why you would do this. Not to time the engine, just to make sure it's in the ballpark and NOT 180 out-a useful trick).
Of course the trouble may lie in the other stuff mentioned and more besides. Start with the simplest things and go from there. Carb trouble is possible, but considereing what you've been doing to the engine, it would about last on my list. Much more likely you didn't get something back together just right. Happens to everybody.
11. If thou be not absolutely sure of thy facts, thou shalt Google before posting thine answer.
I am with Gene_J on This one, DO the easy thing first MAKE SURE THE WIRES ARE ON COUNTER CLOCKWISE.
I did the same thing on the 429.
I have always been among those who believed that the greatest freedom of speech was the greatest safety, because if a man is a fool, the best thing to do is to encourage him to advertise the fact by speaking.
Woodrow T. Wilson
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.