Question about 1989 Lincoln Town Car

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1989 Lincoln Town car Mid speed stumble

The above car has 85,000 miles, original 5.0 engine, except for normal maintenance items (including fuel filter replacement and PCV valve) and is in excellent condition. There is no "check engine" light. However, it has developed an irregular "stumble" at mid speed, or cruise, operation. If the car were carburetor equipped, I would describe the problem as perhaps similar to vacuum leaks in an old carburetor. I am in the Greensboro, NC area and have not found anyone competent to look at it. So, I am forced to try myself. I am an aircraft mechanic, so I have a clue, but don't want to be too arrogant :-). Is it possible to find some way to check for fault codes or does this car a common problem that occurs? Any help is greatly appreciated! Thanks, Rick

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  • Anonymous Dec 31, 2008

    Yeah, as a matter of fact, I was pulling a trailer when it started! And it felt just like that. It surprised me when the trailer was off and felt the same way.

  • Rick Flynn Jan 06, 2009

    Turned out to be just plugs and wires were the problem. Never overlook the obvious!

  • Rick Flynn Mar 11, 2009

    Finally found the problem!! EGR valve had failed! Was lucky to find an OEM replacement. Non-OEM EGR valves don't always work well. Wasn't cheap at $270.00!  
    Runs super smooth now and gets MUCH better gas mileage...........Thanks for your support!

  • warlock61
    warlock61 May 11, 2010

    does it feel like if you were pulling a trailer? Like the bump feel?

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Sorry I haven't replied sooner, thats why I asked about the pulling the trailer feeling, it usually is caused by the EGR valve

Posted on Mar 11, 2009

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I suspect a vacuum leak, rubber does break down faster when exposed to heat

Posted on Feb 18, 2009

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2000 lincoln navigator 90k mile service


Normal Maintenance Details
90,000 Miles (144,000 Kilometers) : All Applicable Models
PERFORMED OPERATION COMPONENT
INSPECT BALL JOINTS
If equipped.
INSPECT BRAKE SYSTEM
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