Hi

since today morning i have a misfire.
I have no codes and there is no light flashing.

How can i check the coils?
Where should i begin to search the problem?

What else as the coil or the spark plug could it be?

Cool gift from Santa....

 

Today, i have now removed all the spark plugs and coils, in 4 hours, without disconnecting the rails.
All spark plugs were fine (visual control) and there was a spark at all coils.

After reassembling, when i disconnect one coil after another, there is always a speed reduction at each disconnected coil.
And ther are only 7 cylinders firing...

I will now go change every spark plugs and the rubber grommets on the coils as well.

Is it possible that this effect may incur in disguised tax time (timing chain problem?)?

 

A weak spark will still fire at idle but will fail under load, such as when accelerating. This is why you're seeing a change in the engine when you disconnect each coil. The easiest way to find the faulty cylinder is to use a scanner that can read live data as you drive. The live data from the scanner will show a misfire count per cylinder.

 

Dani, the misfire could also be an injector problem. You will need to identify the problem cylinder using a scanner. If you want a professional scanner I suggest searching ebay for a Snap-On, Mac or Ford dealer unit. With the Ford unit you will be able to do much more than just read codes

 

I only have a Laptop and Digimoto and ScanMasterElm....

 

That should be enough to locate which cylinder is misfiring.

 

Today I made ​​the action again ... COP's out, spark plugs out ...
(Bevore, i had a code P0353, but no cylinder.... )

Contrary to my assumption, not a plug was wet, although only seven cylinders have fired!
This points toward my humble opinion, a defective injector or a power problem in the supply line ....

Here are a few photos. For more pictures here

1.5 hours for the removal of the spark plugs and COP's with built-in Rails

 

Today i looked for the codes with professional equipment.
But there is no code at all....

Every plug is ok, every coil is ok...

Now i have to check the injection valve, but in fact, i dont know where else to search to find the problem...i'm just a "hobby-mecanic" at least...

What else can affect my problem?

 

Dani, at one time I had a mystery miss in my truck and the problem turned out to be this;














Duralast/Crankshaft Position Sensor

For your 2000 Lincoln Truck Navigator 4WD 5.4L SFI DOHC 8cyl


Price:$22.99










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Part Number: SU256



AVAILABILITY:




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AVAILABLE

Normally stocked at your local store.




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Ships within 2 business days.



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Features & Benefits
Duralast products are engineered and manufactured by Wells Manufacturing, a leading global supplier of advanced vehicle electronics solutions for original equipment and replacement applications. Every component either matches or improves on the OE design to ensure fast, easy installation, superior performance and reliability. Wells offers extensive application information and technical support via its Tech Line at 1-800-558-9770, as well as in-depth product and repair videos on the Wells web site or on the “Wellstech” channel on YouTube.• The crankshaft position sensor identifies position of the crankshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
• When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown
• Designed to meet or exceed OE specifications in form, fit and function
• Global coverage for import and/or domestic applications







Part Number:

SU256



Weight:

0.1 lbs



Warranty:

Limited Lifetime



Connector/Terminal Type:

Female



Package Contents:

Component Only



Remanufactured Part:

No



Shipping Information:

Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses.

 

Problem solved!

Changed all the 8 coils (Accel from Summit) and now it runs like new

 

glad you figured it out. Happened to me also, missfire w/ no cel, changed all 8 coils and BINGO! ran like new.