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Service engine soon light stays on

Tiny
JOEH
  • MEMBER
  • LINCOLN NAVIGATOR
91,000 miles, 5.4 liter engine. The service engine soon light stays on. The problem keeps saying problem with cylinder 8. I have changed the spark plug the fuel injector the coil for cylinder 8 change the gaskets thinking it may be a vacuum leak switched coils and plugs checked compression and nothing works. When I have done any of the major repairs like gaskets or injector the light stays out for about 135 miles but than it comes back on. Do you have any ideas or have you ever seen this problem before. Thanks for any help.

Joe
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Saturday, April 14th, 2007 AT 11:19 AM

27 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
For what it matters, there is a tsb out there for CEL showing misfire codes and low compression that leads to a cylinder head replacement.
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Wednesday, May 16th, 2007 AT 9:59 PM
Tiny
JOEH
  • MEMBER
  • 3 POSTS
Can you explain what tsb and cel stand for, I have limited knowledge of these terms.
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Thursday, May 17th, 2007 AT 1:17 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Gladly.

TSB-Technical Service Bulletin.
. This is a bulliten put out by the manufacturer to potentially helpor guide a technician mostly to help diagnose a problem.
CEL-Check Engine Light

Sometimes a TSB is the magic bullet. Somteimes it's just a blank.
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Thursday, May 17th, 2007 AT 5:58 PM
Tiny
JOEH
  • MEMBER
  • 3 POSTS
Is there a place I can check the tsb other than a dealer
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Thursday, May 17th, 2007 AT 7:07 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,822 POSTS
Hello,

I would double check to make sure you have the correct cylinder and then recheck the compression and each of the component you have replaced. It sound like you may have got a defective ignition coil.

Please let us know what happens.

Cheers, Ken
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Monday, May 29th, 2017 AT 8:41 PM
Tiny
MILLERJJSSGT30
  • MEMBER
  • 1 POST
  • LINCOLN NAVIGATOR
I have a 2001 Lincoln Navigator with roughly 87,000 miles. It's a automatic with just about every bell and whistle installed. I heard some engine noise and the check engine soon light came on. I was near a Lincoln dealor and drove into the shop. The dealor told me with out looking at the vechicle that it sounded like I needed a new engine. I asked him to do a compression test, which they did and he said that their was only 50%. He told me that they did some investigating and forund that the #7 plug had been blown out. He also said that only half of the plug pieces were recovered, and that when it blew the plug stripped all the threads out of the cylinder. He said that their is no way to get a plug back in. Is this common? Does it really sound like I need a new engine? Are there any alternatives that I can do to get by until I get back from Iraq when I have more money to spend on a new engine? I leave in a month and only need to drive a very short distance.
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Monday, May 29th, 2017 AT 8:42 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Well. To do a compression test, you need to thread the gauge into those very same threads the spark plug goes into. So how could they get any kind of compression reading if they can't thread the gauge in?

I would get the truck out of there and find an independent garage. If the threads are blown out, a helicoil may be able to be installed that would possibly work.

One question I have is why did this happen to begin with?
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Monday, May 29th, 2017 AT 8:42 PM (Merged)
Tiny
YOURI
  • MEMBER
  • 2 POSTS
  • 2001 LINCOLN NAVIGATOR
  • 176,000 MILES
Hi am from France, and I just bought a Lincoln navigator 2001 and today at idle or neutral the engine was giving vibration and after a while the light service engine soon come now I have a strange noise to from the exhaust when I increase the RPM?

Do you think it will be expensive? Its 176000 kilometer no miles thanks in advance :-)
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,128 POSTS
Check for vacuum leaks and check the IAC solenoid.
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
YOURI
  • MEMBER
  • 2 POSTS
Thanks a lot for the answer I will chack this
do you know some website specialized for spare parts?And they will send oversea?
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,128 POSTS
I don't have a specific site; however, there are many that will ship parts. Also, when looking for the vacuum leaks, pay close attention behind the throttle body. There is a hose that has a 90 degree bend in it. They are known to leak there.
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
WGREEN150
  • MEMBER
  • 1 POST
  • 1999 LINCOLN NAVIGATOR
Computer problem
1999 Lincoln Navigator V8 All Wheel Drive Automatic 168K miles

I've had the service engine light come on several times. The dealer replaced the oxygen sensors 2x (both) and later traced wires that indicated an electrical problem and repaired. 3 months later the service engine light has come back on and the Dealer states I need the fuel pump replaced but I've had no problems starting the vehicle. I have however heard a strange sound coming from the engine. Can a fuel pump going bad cause the service engine light to come on?
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok first call around and find a local parts store that does a free scan and have them do a scan and get the codes and then have them clear it get back to me with the codes.
Next the engine noise call your ford dealer and give them the vin number and find out which engine you have. What I would like to know is 4.6ltr or 5.4ltr and is it Romeo built? Get back to me and we will go from there.
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
MAINAZ
  • MEMBER
  • 1 POST
  • 2000 LINCOLN NAVIGATOR
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 141,750 MILES
My ABS light keeps beeping and now my service engine light came on yesterday. Also, every time I lock the car with and without the alarm system, my locks keep going up and down until I manually turn it on and off. Sometimes I find that my battery is completely drained flat and I have to jump it again. I just put a band new battery in there. Please help! I appreciate it and thanks for your time.
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
STEVE W.
  • MECHANIC
  • 12,940 POSTS
You need to get the various systems scanned to see what fault codes are stored. The ABS light could be a bad sensor, wiring or the ABS module. The code that is turning on the light should point to that.

The SEL light will also have a code or codes stored. Those can be just about anything on the vehicle. The code at least gives you a breadcrumb to start at.

The locking issue sounds like a problem in the BCM, which may be what set off the SEL.
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
CHARLES.MYERS
  • MEMBER
  • 1 POST
  • 1999 LINCOLN NAVIGATOR
  • V8
  • AWD
  • AUTOMATIC
  • 250,000 MILES
Engine Performance problem
1999 Lincoln Navigator V8 All Wheel Drive Automatic 250000 miles

Idles rough and after light has been on for 100 miles having a miss at 40-45
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
What code(s) are stored by the light?
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
WGMOORE13
  • MEMBER
  • 1 POST
  • 2001 LINCOLN NAVIGATOR
Engine Performance problem
2001 Lincoln Navigator V8 Two Wheel Drive Automatic 104k miles

I went by AutoZone and for free they checked the codes and found I need an O2 sensor. Where are they, how many, do they all look alike and have the same part number?
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hello,

The O2 Sensors are located in the exhaust system.
Did you write down the code, it will tell you exactly which sensor has failed. Also, depending on the code it may be something else that is causing the sensor to read faulty.

So if you have the exact code post for better diagnostic.

.
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Monday, May 29th, 2017 AT 8:43 PM (Merged)
Tiny
RICKYL
  • MEMBER
  • 1 POST
  • 2002 LINCOLN NAVIGATOR
  • V8
  • 4WD
  • AUTOMATIC
  • 63,000 MILES
Engine problem
2002 Lincoln Navigator V8 Four Wheel Drive Automatic 63000 miles

I have a 02 navigator with the service engine light I have changed all 3 sensors 3 times the light still comes on I was told now after 3 sensors that it is a carbon buildup. How can I repair this problem one auto shop wants 300.00 dollars the other wanted 475.00.
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Monday, May 29th, 2017 AT 8:44 PM (Merged)

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