1973 Other Lincoln Models Bad Gas? Bad pump, plugs, wires po

  • 1973 LINCOLN
  • V8
  • 2WD
  • 82,000 MILES
1973 Lincoln Mark IV 460ci
Last Thursday I filled my tank at a Sunoco station with 93 octane with my lead additive, later that day I participated in a hot rod/classic car cruise for hours at idle speed. The next morning, my car started easily. But in turn has a rough idle speed or stall, slight but noticeable engine vibration, slow rev, serious loss of power, from the line almost takes 10 sec to get to 60mph, and lets not forget Horrible gas mileage. It has a touch of a gas smell out of the exhuast, but NO smoke/ moisture of any kind. And a very so slight ping noise and it backfired slightly out of the carb, like a popping or a burp, but no BANG.

I have cruised many forums looking to trouble shoot my issue. And all the possibilities lead to the same outcome. Granted my parts are $10 here and 30 there, but on this path I could be in the $100's of dollars before I get it right.

within the last 3000 miles I have replaced: cap/ rotor, wires, plugs, fuel filter, ignition coil. All was fine till that day of sudden lack of all around performance.

Any solid direction would be helpful.
Do you
have the same problem?
Monday, August 23rd, 2010 AT 11:52 AM

1 Reply

I'm going to start this off by saying that I am not a Ford guy.

But I have worked on a lot of 352 and 390s from the mid to late 60's.

I'm thinking a carb rebuild kit would get you back into shape. Probably the power valve is leaking.

A back fire out the tail pipe suggests running lean, a backfire up through the carb suggests running rich.

You've got bad acceleration, bad gas mileage, bad idle and can smell gas.
If everything that you replaced on the ignition system is working correctly, then it almost has to be the carb.
Was this
Wednesday, August 25th, 2010 AT 1:37 AM

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