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motor idles up & down up & down 1979 MARK V LINCOLN


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lincoln mark V
New User

Oct 23, 2016, 7:36 PM

Post #1 of 2 (1283 views)
motor idles up & down up & down 1979 MARK V LINCOLN Sign In

My lincoln runs like new, except when I stop for a red light or stop sign. The motor idles up & down up & down. Evens does it in gear but not as bad as in idle. I replaced the plugs and wires. Run some cleaner thru the carb. Used seaform in the gas.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 23, 2016, 10:56 PM

Post #2 of 2 (1271 views)
Re: motor idles up & down up & down 1979 MARK V LINCOLN Sign In

What general scene is this car and situation? Just got this thing and or how was it used or stored? Restored or well kept? What's the story?


The most common idle issues will be or were vacuum leaks. At the age or 1/2 this age time to check for any and all.


Haven't written the 500 page total sequence of how to mess with or fix a choke on this or others late with carbs were also a nightmare spot and worse with use of ethanol in gasoline almost unavoidable now.


At least know choke is fully OFF when having this idle problem and hunt down all vacuum leak items - rubber hoses everywhere, carb base gasket, PCV hose, hose to brake booster if it has one (might be "Hydro-Boost") or could use PS fluid pressure for power brakes? Forgot.


EGR gasket and EGR itself. Intake manifold to head gaskets - all of it.


If not done vacuum hoses probably ready to just do them all about now a second or 3rd time. Some can or were plastic not rubber and should have failed long ago for rubber fixes.


What do you have here condition wise?


T







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