The motor generally runs good and no forscan codes...but only 23mpg (around town) and sometimes hard to start (starts within 3 attempts) or first time after 3-4 seconds.  So just looking around for possible problems.

What can Piston heads carbon buildup and injector burn pattern tell me about the engine health.

In the images, i think cylinders 2 and 3 are not as clear burning as 1 and 4. 

Do I have a problem with injector, sparks, coils...?

This engine uses indirect injection.  The injectors fire into the manifold, not into the cylinder.

That is an interesting burn pattern though, particularly on cylinder 3.  I'm not sure what to suggest for that.

Ok, i think understand that. The fuel/air is combines as it's pushed or pulled from the manifold into the cylinder, where it is ignited/burned.

Do I have a problem with injector, sparks, coils...?

61k miles, not burning oil, no smoke,

Pre Cat lambda reports correctly in forscan software.

Catilitic converter appears clear and clean using the scope.

Crank shaft position sensor clean (0.4 ohms)

All 4 spark plugs look good, have done 20k, NGK IR ITR6F13 with 1.3 gap (4.? ohms)

All 4 ignition coils look good, originals, primary 0.4 ohms, secondary 5.12k ohms.

I assume from your Screenshot that there is no Misfire Monitor in the Mode 6 Tests for your car.

If not there may be  a PID for live Misfires in the PCM.

It wouldn't hurt to change the plugs

Misfire Monitor in the Mode 6 test...PID for live Misfires in the PCM.

Is this what you mean?

Note...I reset the adaptions on the pcm... Reasoning for doing this is that a new egr (old egr was stuck close) and Pre-Cat lambda was fitted some weeks back. Car now starting much better and idling at 780 smoothly. Done 15miles today and will monitor as pcm relearning.

14 hours ago, DaveT70 said:

It wouldn't hurt to change the plugs

I thought these iridium plugs were good for 60k plus?

Have you any thoron the coils ?

All 4 spark plugs look good, have done 20k, NGK IR ITR6F13 with 1.3 gap (4.? ohms)

All 4 ignition coils look good, originals, primary 0.4 ohms, secondary 5.12k ohms.

57 minutes ago, ride_comfort_is_my_object said:

Is this what you mean?

With some cars you can see an ongoing count of the Misfires for each individual Cylinder in the Mode 6 Tests and also in some cars you can see live Misfires for each Cylinder but it looks like FORScan does not have either for your car.

I'm glad the car is running better now and thinking about things the Fuel Consumption you are getting around town may be as good as it gets for a 20 year old 2.0 Litre car. A longer out of town drive should give you consumption figure that you can compare with the official figures when the car was new.

On 3/25/2025 at 5:36 PM, TomsFocus said:

This engine uses indirect injection.  The injectors fire into the manifold, not into the cylinder.

That is an interesting burn pattern though, particularly on cylinder 3.  I'm not sure what to suggest for that.

Can you point me to what this is about?

34 minutes ago, ride_comfort_is_my_object said:

Can you point me to what this is about?

No, sorry.  I'm not sure why they've set maximum to 0.00.

0.75 volts should be acceptable for an O2 sensor output.  (Generally 0.2-0.8v).

2 hours ago, ride_comfort_is_my_object said:

Can you point me to what this is about?

The short answer is that the correct functioning of O2 Sensors are critical for the Emissions Legislation so they are monitored to within an inch of their lives and if there was a fault then the Engine Management Light would illuminate and one of the many Fault Codes that relate to the O2 Sensors would be thrown up whether Ford liked it or not.

2 hours ago, Tizer said:

The short answer is that the correct functioning of O2 Sensors are critical for the Emissions Legislation so they are monitored to within an inch of their lives and if there was a fault then the Engine Management Light would illuminate and one of the many Fault Codes that relate to the O2 Sensors would be thrown up whether Ford liked it or not.

..and perhaps as there is no fault codes shown with Forscan that it may be a software bug.?

8 hours ago, ride_comfort_is_my_object said:

.and perhaps as there is no fault codes shown with Forscan that it may be a software bug.?

I stand by what I said previously, if there was a fault with the car that affected Emissions then your Check Engine Light would be on and there would be a Fault Code.

On 3/26/2025 at 7:49 AM, DaveT70 said:

It wouldn't hurt to change the plugs

Hi

I seen in another topic on automatic transmission you mentioned "may need to go aftermarket on the cooler loop"... What did you mean?