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Tale of a Spark Plug
Posted 04 August 2017 - 06:41 PM
I decided to change the Spark plugs too, even though they're only around 17,000 miles of use. Peace of mind and I can see how my plugs are doing since I've been using ACES IV and Livernois' tune.
Well 5 plugs come out perfect. By far best I seen compared to my "pig rich" Fusion. I also definitely do not need colder plugs or smaller gaps, as these are really great condition reads. I give my thanks to ACES IV as it aims to create the perfect combustion process.
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But the 6th plug, which was in Cylinder 4, come out with some bad news:
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It's got ash deposits and is wet around the center electrode. It's soaked in fuel.
At first I worried about the oil leak TSB due to bad 2.7L/3.0T cylinder heads for vehicles during a certain production time frame, but the plug appearance indictates no oil contamination. The plug still fires but is far weaker than the others.
This plug is the reason for mini misfires and shift lags. It fools me really well however because it does not power lag all the time.
Bad plug is sadly not the case. My newest plug that was placed in to Cylinder 4 has fouled out within 2 days. Its been predetermined to be a faulty fuel injector. I've been with this faulty injector since taking delievery of the car.
So back to the dealership it will go. I shouldn't need anything (hopefully) drastic like a new engine. Just fixing the fuel system and probably gain back power and fuel economy I've been missing out on this entire time.
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Posted 04 August 2017 - 07:36 PM
Explains why the car shifts harshy after I start it up and it begins shifting. Over time it will shift smooth, but minor misfire may happen randomly. I did have two times in the past I got full flashing CEL on the dash with codes on Cylinder 6 (not 4), but it corrected itself. Under high loads the 2nd to 3rd gear really drags and I clock like 5.0+ seconds in 0 to 60 momemts, with a Livy tune...and I know thats not its full potential.
Will know more after Tuesday.
Edited by Zalvern, 04 August 2017 - 07:37 PM.
Posted 06 August 2017 - 10:37 PM
Yes, better to be running rich than lean. No problem with bolt-on modifications, as the most important thing is they're reversible and unrelated to the issue at hand. The only thing that could possibly mess up a fuel injector would be a PCM tune, however if that was the case the tune would have ruined all of the injectors, not just one. ACES IV gasoline formula is also ruled out because the other 5 plugs were in excellent condition, and if it was the culprit, all the spark plugs would of shown issues.
I will revert to stock tune not because I am trying to hide it, but getting a new fuel injector may require re-calibration of the fuel control within the PCM. This may change my Strategy code which Livernois may need to update on.a
Time for another loaner...maybe I'll get a Continental this time. It's nice the dealerships let me pick a loaner if they have multiple available.
EDIT: Continental was barebones and non turbo V6. Went with the Black Label MKC instead.
Edited by Zalvern, 07 August 2017 - 06:48 PM.
Posted 11 August 2017 - 08:54 PM
The car has mini misfires simply due to...its heat on intake air. Go figure, another reason to crave stuffing in C-PE's upcoming Fusion Sport Intercooler.
On days when it isn't humid or 85+ degrees of hot air...I get insanely nice and crisp shifts.
Edited by Zalvern, 12 August 2017 - 04:55 PM.
Posted 12 August 2017 - 02:07 AM
Yes. Heat really affects this car. I've noticed a real drop-off in performance on hot days with the A/C on, especially at low speeds when you get on it; momentary stumbling. It cooled down the last few days and I was able to shut off the A/C. What a difference! It must be throwing off so much heat around the IC.