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Science Of Automotive Diagnostics

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diagnostics

Difficult One, Code P1000

What problem is the most difficult to diagnose? The one that does not exist when you are looking for it. I think I am particularly unlucky with those because I possess some sort of magic touch. I’ve seen a whole lot of cars that were doing all kinds of troubles for their owners but once they get to me – they are working perfectly fine. I think I should charge at least some small fee for doing that 🙂

2012 Ford Escape 3.0 V6 got brought to the shop on a tow truck and left on a parking lot.

Continue reading “Difficult One, Code P1000”

Misfire Under Load

Here is a spark plug with clearly visible whitish tracks showing where high voltage was draining to the ground instead of jumping across air gap producing a spark. Cylinder where this spark plug was installed had misfire under load (on acceleration) at the mileage of just a bit over 60 000 km on Ford F-150 3.5 EcoBoost. It is rather unusual to see spark plugs condition like this at that mileage, probably poor fuel quality was the case of it. Continue reading “Misfire Under Load”

Rough Idle And Hard To Start

This job turned out to be interesting as it the concern in the vehicle was caused by not one but three different problems. Discovering them one after another was pretty, should I say, educative and took a lot of time and effort.

The concern was described by customer as “Engine is difficult to start, requires long crank to start and has a rough idle when running”. Customer tried to fix this himself by replacing spark plugs and “cleaning throttle body”. Vehicle in question was 2011 Ford F-450 Super Duty service truck with 6.8 V10 gas engine. Continue reading “Rough Idle And Hard To Start”

Free Diagnostics

I am very happy to see that times of “free diagnostics” are slowly but surely going away.

Few years ago when I was posting on the same issue on another website it was super easy to find a header picture for illustration. Today I struggled to do the same, wow! 🙂

Instead I found perfect illustration of true value of “free diagnostics” on the picture above

“Free Diagnostics” was one of the worst marketing ideas in this business. Continue reading “Free Diagnostics”

One Failed Part – Five Fault Codes

2015 Ford F-350 truck with 6.7 V8 Pover Stroke diesel with only couple of thousand kilometers on the odometer came to the shop with concern of Check Engine Light being on, reduced engine power and turbo pressure gauge showing max pressure all the time.

On the test drive I couldn’t verify loss of power or incorrect turbo pressure gauge operation, but engine light was on, indeed. Self-diagnostic test revealed four fault codes stored in PCM memory, one of them confirmed as current fault on KOEO test and one more code was detected after test drive when I run KOER test. Continue reading “One Failed Part – Five Fault Codes”

Overheating Pathfinder

Super easy case of engine overheating diagnostics :-). Obvious reason for this problem in the middle of hot summer is right on the nose of this truck. Fancy shiny radiator grille inserts are blocking airflow through the rad almost completely. Those things are seasonal and needs to be removed after winter. You don’t have to bother fitting them back either when snow falls again – truck will be just fine without them anyway 🙂

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