Question about 2006 Lincoln Navigator

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Navigator has been in shop for 3 weeks. Misfiring around 1500-2000rpm. have replaced all spark plugs, 5 of 8 coils, fuel pump, throttle body, 2 selenoids, and run every supposed diagnostic and they cannot find cause. What is up with it????

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Replace all coils and coil boots. make sure there is no oil or water within the spark plug chambers!! i always recommend ALL coils to be replaced on these vehicles. They usually fail one by one after 70K miles. hopefully this help'd

Posted on Oct 01, 2010

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Cylinder 3 misfiring on a 97 gmc jimmy 4wd. Did a tune up about 2 months ago (ignition, wires, coil, spark plugs), replaced fuel pump last week, used fuel injector cleaner, still no luck...any ideas?

go back and check all the plugs, wires and the total tune up. check your firing order, and timing. put a timing lite on the plug wires and if the plug is bad it will show with the light. lol.

Oct 05, 2015 | GMC Cars & Trucks

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Still having problems will not run good. 1997 ford 2.0 escort;new plugs&wires coil;fuel pump still codes 0351;

From a reputable repair website:

P0351 - OBD-II Trouble Code

Auto Systems and Repair

Ignition Coil "A" Circuit Primary/Secondary Malfunction Our emissions expert has put together the following information about the P0351 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
  • OBD II P0351 Ignition Coil "A" Circuit Primary/Secondary Malfunction
What does this mean? The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. Without reliable performance from the ignition coil(s) the vehicle will stumble and misfire.
Code P0351 indicates there's an electrical problem in either the primary ( the computer side ) or the secondary ( the spark plug side ) of the Ignition Coil "A" Circuit.
  • Check Engine Light will illuminate
  • Engine idles rough
  • Engine misfires on acceleration
  • In rare cases, the engine may not exhibit noticeable symptoms
Common Problems That Trigger the P0351 Code
  • Defective Ignition Coil(s)
  • Defective Spark Plug(s)
  • Intake Manifold Vacuum leaks
  • Carbon buildup in the Throttle Body air passages
  • Defective Idle Air Control Valve or Electronic Body
Common Misdiagnosis
  • Ignition coil(s) replaced when cause of the malfunction was a vacuum leak
  • Spark Plugs replaced when cause of the malfunction was a vacuum leak

Dec 21, 2014 | Ford Cars & Trucks

1 Answer

Fuel pump relay

1. Fuel pump pressure.
2. MAF (Mass Air Flow) sensor.
3. Spark plug gaps.
3. Air induction system.
4. Fuel injectors.
5. Cylinder compression.
6. Catalytic converter or honey comb porcelain.
7. Brake system.

Aug 26, 2013 | Toyota Yaris Cars & Trucks

1 Answer

1994 CHEVROLET C1500 PICKUP 4.3L V6 vortek cranks no start backfiring thru the Throttle body fuel injection system. The Distributor has a small hairline crack under the reluctor wheel could this be the...

100 psi per cylinder is way too low--should be in the vicinity of 150-165 per cylinder
back firing indicates wrong firing order and as you have replaced the plugs etc check that you have the leads on the correct plugs in the correct order
the timing for the engine should be around the 10 degree btdc and not tdc

Mar 23, 2017 | Cars & Trucks

1 Answer

The service engine light came on - code was P0305 The coil, spark plug and wires all replaced. Fuel injector cleaner added. After, the service engine light flashes on then off - code P0174

Must be a full moon today & repair shops purposely
do poor work this week

This site is unbelievable

You gave use no vehicle what so ever

We only guess here anyway, so what the heck

The PO 305 usually is a COP ---individual coil-on plug
related problem -- for cylinder #5 last number of code
301 thru 306 or 8

With that there are no spark plug wires

Injector cleaner --- think about 16 oz in ten or more gallons
of fuel. Really do much,not in my 47 years experience
Won't hurt,but won't fix anything. If it was necessary or did
work it would be recommended in your owners manual & come with the car

Now the PO174 is an O2 Sensor Code so common I think
we all have one

System too lean on Bank 2
In your case that is the passenger side most likely

80% of O2 Codes are Vacuum leaks & a misfiring coil,
that your shop can't figure out doesn't help

Bottom line: few places seem to like or be able to fix a ford
Seriously,including some dealers,how is that. I have have no problems

Let go further

Spark Plugs--are they replaced every 3 years & not over 60,000 miles
O2 Sensors --replaced at 100,000 miles front 2 only,ones in inlet of converter
MAF Sensor cleaned once or twice a year
All ducting from air filter to throttle body--- leak free
NO VACUUM LEAKS ANYWHERE --ducting,intake,EVAP System,exhaust system

Your shop needs to actually use their scan tool in mode $06 & drive the car
& look at misfire counts & any number of other data

A new repair shop would be my suggestion
Sloppy work for sure

Aug 04, 2011 | Ford Windstar Cars & Trucks

1 Answer

2006 Lincoln Navigator, goes for weeks with no problem then will gor for weeks with randomly not starting until the 2nd or third attempt . Car usually will crank but not turn over.

Turning over is cranking
You mean will not start !!

Given it is 5 years old

Change the Spark Plugs,if you haven't
Change both front O2 Sensors at 100,000 miles
Clean the MAF Sensor --CRC MAF Cleaner

Next -- TEST the TPS Sensor on throttle body
It is replacable. (2) T20 Torx screws and a hair
dryer to soften the thread locker
You may be loosing the throttle position on start up

Then check fuel pressure, at the fuel rail on engine,
also if your not going to work on it yourself, have the TPS
and Fuel Pump looked at with an Oscilloscope

The fuel pump may be going bad

Mar 28, 2011 | 2006 Lincoln Navigator

1 Answer

My '01 impala 3.4 v-6 flat spots when COLD, at around 20mph. the idle is ruff with random misfires. acceleration is overall poor. when HOT, most symptoms go away leaving only some slight acceleration...

depending on mileage, but possible tune-up could fix it. if already done then check ignition coil pack and ignition wires also spark plugs, check vacuum hoses for leaks or porous, last injectors clogged - use some techron fuel injector cleaner (wal-mart has them). Also get the throttle body and iac valve cleaned by throttle cleaner . Also this other possibilities are to be checked and confirmed.:---- Engine running rough or misfiring can be cause by the following:

1.Defective spark plugs
2.Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4.False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

--------- This should help.Keep updated.Thanks.Helpmech.

Mar 27, 2011 | 2001 Chevrolet Impala

1 Answer

Car is sluggish and tends to bog down during hard

Could be several possibilities none of which I may be able to eliminate:
1. Tune-up!  You are not getting enough spark or Fuel!  Plug-wires may be cross-firing or bad ground from body to the engine - run a new ground wire to engine from battery or body-ground.
2. Replace fuel filter or do fuel pressure test to determine if f-pump is weak or lodged with corrosion or dirt particles.
3. replace plugs and wires and clean coil-pack ignition module (where plug wires originate from) use a brake-cleaner or throttle-body cleaner but be sure fumes are evaporated and dry before starting or spark could cause explosion from fumes. Oil on module could cause spark to jump.  Do not run plug wires along each other or will jump spark, wires must be crossed once or twice for prevention of this.\
4. check all vacuum lines around engine - a cracked vacuum line can cause a lot of problems.
5. injectors may be dirty or bad - easier to replace complete intake from scrap-yard then to pay $100.00 for new injectors each!
6. Coil-pack on ignition module could be cracked and may need to be replaced.
These are only possibilities of course with the little info you provided.
Hope this helps.

Jun 08, 2010 | 1999 Chevrolet Malibu

1 Answer

I've a problem with misfiring in # 5 cylinder -combustion failure

1. Swap two ignition coils between #5 cylinder and another one.
2. If the #5 cylinder misfire problem is still present you must check up wire by wire the electrical supply cable from the Engine Control Module (ECM) to the #5 ignition coil. Repair damaged wire(s). The last piece out of order will be the ECM !
3. Inspect also #5 spark plug if it is wet or dry. If it is dry then you must verify the #5 injector!

Mar 18, 2010 | 2003 BMW 330

2 Answers

Installed new fuel pump. New fuel pump working but truck still wont start

Things that you need for the engine to run
1- Fue
your error codes will help you determine which to address

Oct 15, 2009 | 1998 Chevrolet S-10 Pickup

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