Question about 1999 Lincoln Navigator

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Service engine soon light is on. now the truck is idling too slow.

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  • Lincoln Master
  • 501 Answers

You need to have it scanned. There are a couple of things that could cause the idle to low. One is the Idle air control and the other is the mass air flow. Also the Throttle Position Sensor and the air air temp sensor. Also the EGR, exhaust gas recirculate. Get the picture.

These engines are totally computer controlled, and the service engine soon light is there to tell you that you have a problem. Most Advance auto or Autozones will scan it for free, but take the code it gives and research the code , don't just replace a part.

Hope this helps

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: Service engine light is on

if the check/service eng soon light is on a problem has occurred in one or more of the electronic systems of the emission system/engine management, it is very rare you will feel anything, the system has very good failure mode programming to keep that from happening, at this point the only thing will be that it won't pass a smog test, or the mileage may be affected. Have a test run to see which codes are present in the computer memory.

Posted on Nov 30, 2008

  • 188 Answers

SOURCE: Truck losing power and service engine soon light on

Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.

Posted on Feb 02, 2009

  • 1 Answer

SOURCE: 2002 1500 rough idle wont go over 35 mph service engine soon

Have you O2 sensors checked out. I have blowen out 2 on the same bank, sounds like the same problem. Check engine light will stay on solid, blink for a while, solid. Surefire way to check is run your finger in the tailpipe after it is cooled down. If it is very black with soot, then it probably is the O2 sensor.

Posted on Mar 19, 2009

  • 497 Answers

SOURCE: 03 Ford Expedition service engine soon light

Take it to your local mechanic to get an OBD code check. It should tell you the problem, and you can get an estimate on the fix unless you want to do it yourself. It could be a fuel filter issue.

Posted on Sep 06, 2009

cooper0365
  • 347 Answers

SOURCE: 2001 gmc safari flashing service engine soon light

id check mas air flow sensor maybe 02 sensor might bet the mas sensor

Posted on Oct 19, 2009

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