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My 1983 Alfa Spider started backfiring driving down the road the stopped and will not crank. The car has been completely restored including an fresh engine rebuild with about 60 miles on it. All hoses have been replaced during the build minus the big hose to the MAF. It has been smelling running a little rich so yesterday I replaced the fuel regulator. Could I have a bad MAF?
 

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When you say 'it will not crank' do you mean you turn the key to 'start' and there is no response - the starter does not activate & the engine does not turn over? Or do you mean it goes R-R-R-R but does not start?

Check all the intake & vacuum hoses very carefully. The L-jet system is very intolerant of any loose, split/cracked hoses. Inspect the large intake intake hose across the top of the engine very closely. The accordion shaped area at the AFM is known to crack & split on the underside - you may need to take the hose off and flex that area to find a split.
 

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Correct. I was driving down the road and it started backfiring bad. Then shut off. The start is turning over and while cranking you can hear back firing out the exhaust but will not crank.
 

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Perhaps a couple spark plug wires have come loose? Only one loose shouldn't keep it from starting, but two?
 

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86 Veloce
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Fresh rebuild? If it was running fine and all of a sudden it started backfiring, quit running and now backfires when you turn it over I would run a compression check...
 

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Check your condenser. That same thing started happening to mine and suddenly stuttered and stopped. At first we thought maybe it was rust in the tank, but it was the condenser...
Easy and cheap swap...
 

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86 Veloce
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The AC unit..... lol
 

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Please check the large crossover tube from the airbox to the throttle body. I had mine work loose years ago while driving. Also, check the connection to your air flap (what you called the MAF).
 

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check the coil wire between coil and dizzy is clean and tight.
check the distributor has not been left loose (shouldn't turn with your hand)
look inside the distributor, check for signs of contact between rotor and cap, or damage to rotor
 

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I had a similar problem, but was able to limp my spider home. I have a 123Ingition Distributor, and to my untrained eyes, the cap and rotor seemed fine. I replaced them anyway (after a bit of a search), and she fired back up.
 

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Freshly rebuilt engine - backfiring - timing chain slipped?
 

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How does an Alfa timing chain slip? You can make a mistake with timing the cams but once they are timed they will stay put unless something breaks.
 

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Thinking more of a broken chain. Apparently the car won't start at all, but just backfires. Haven't heard from the original poster, so don't know where it stands now.
 

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That's why I suggested a compression test Ed. I'm thinking bent valve, etc. If chain was really sloppy he could have had P/V contact on decel.....
 

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The start is turning over and while cranking you can hear back firing out the exhaust....
I can't imagine a broken chain! That thing would hardly "turn over"

OP had the engine fully rebuilt 60 miles ago...I'd take it right back for a 61 mile service....;)
 
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