Question about 1997 Lincoln Mark VIII

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Rpm surge on 1997 Lincoln Mark VIII.

I have a 1997 Lincoln MarkVII that seems to run great but for a little problem. When I'm coasting at a consistent speed, especially at about 35 and 60 mph the engine's rpms rev up about 100-250 briefly and randomly. It's more noticable when cruise is on. Also, when the car is in park and idling, the same thing occurs. Now, the engine doesn't run rough or loud so it's not that noticable. I also have a battery light on the dash that goes off and on. The Lincoln dealership said that there are no electrical issues and they have no idea why that light is randomly on and off. I don't know if these two issues coincide or not. The dealership also said that the car's diagnostic is reporting no issues. The person that owned this car told me that he had driven it around like this for a long time with no further issues. I just want to see what it could be to try and get rid of my small problem. I bought it about 1 month ago and it was last at the dealership last November. The previous owner said the issue was there before he took it in and that the mechanic didn't notice any surging rpm issue. Possibly because it's so small. Please help!!!

Posted by elroyunker on

  • gord storey
    gord storey May 11, 2010

    With engine idleing , open the hood , and watch (and listen) if the Air Conditioning compressor is cycling off and on , off , and on........



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deton8 von Splosion

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BBB INDUSTRIES show 11 TSB (tech bulletins) on your fuel system... Merely reading thru them can give you exceptional insight to the elements & function sensors of the fuel system...

Registration is required... (these are real documents)

BBB Industries Premium Alternators Starters Power Steering Products

Posted on Mar 04, 2017


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SOURCE: 95 Lincoln Mark VIII Won't start up

try crankshaft position sensor. had one go bad on me

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66 chrgr

mike loshbough

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SOURCE: I have a 83' lincoln Mark 6 with a 302 V8 and a 2

put a throttle position sensor on the throttle boby this should fix the problem!

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SOURCE: 2003 cartier 4.6L 120K miles. Rough idle, at idle only.

has anyone checked for a vacum leak? a vacum leak will cause rough idle at idle. check the lines from the pcv valve.

Posted on Mar 27, 2009


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SOURCE: 2000 Lincoln Navigator with rough idling and service engine light

i had the same trouble, there is a rubber boot under the cover on the top of the motor, it is coming from the egr valve, takes about 5 mins to repair and less than 5 dollars.

Posted on Jul 25, 2009


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SOURCE: 1988 Lincoln Mark VII (Bill

I also had the same problem, had to switch back to Motor Craft voltage regulator with the Bill Blass model Mark VII.

Posted on Oct 05, 2009

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