Mhamill66 Posted June 10, 2020 Share Posted June 10, 2020 Hi, I have hooked my focus up to the computer and got back the following message for 3 injectors 'injectors offset learning at max limit'. Any ideas what that means? Is that 3 injectors that need replacing? Or 4 injectors that need reprogramming? Thank you, Mike. 1 Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted June 10, 2020 Share Posted June 10, 2020 Those 3 are now worn so much that the ECU can no longer compensate. It's not worth the cost of replacing them unless you're having noticeable issues with running or excess smoke. Quote Link to comment Share on other sites More sharing options...
Mhamill66 Posted June 10, 2020 Author Share Posted June 10, 2020 Thank you for the reply. I get white smoke when in first start the car, followed by maybe 10 seconds of 'jutters' from the engine. Then the car is fine. I have been advised to have them reprogrammed at ford to level out the fuel intake. Hopefully they wont charge an arm and a leg. Quote Link to comment Share on other sites More sharing options...
JW1982 Posted June 10, 2020 Share Posted June 10, 2020 Reprogramming worn fuel injectors does not make any sense and is a waste of time and money. Fuel injectors of a modern common rail diesel engine are high precision parts that are produced within very small tolerances. Despite the very small tolerances no single fuel injector is identical. After production every single fuel injector is bench tested and compared with a predefined base value. The deviation of the actual test results to the predefined base value is converted into a hexadecimal correction factor value that is (usually) printed onto the fuel injector. By programming the fuel injector correction factor values into the PCM the PCM "knows" the exact deviation of each fuel injector to the predefined base value. Based on this information the PCM is capable to adapt the injection timing and duration to achieve optimum performance. During time the PCM adapts itself and compensates for normal wear of the fuel injectors. If the fuel injectors are worn too much the PCM is no longer able to compensate and generates a DTC code for the particular fuel injector. If the injector is worn the hexadecimal code that is printed on the fuel injector does no longer match the actual state of the fuel injector. When reprogramming the PCM using the values on the fuel injector there is a high risk that the engine runs even worse than before. In some cases the engine may not run at all. 3 Quote Link to comment Share on other sites More sharing options...
nicam49 Posted June 10, 2020 Share Posted June 10, 2020 However, white smoke isn't right, and means unburnt diesel, so you could possibly have one or more injector overfuelling. This isn't necessarily connected with your original query, best take 'em to a diesel specialist for testing, if you can remove' em yourself it costs around £15 each for testing in a proper test rig, NOT to be confused with a simple leak-off test. Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted June 11, 2020 Share Posted June 11, 2020 10 seconds of jitters and white smoke on startup really isn't worth replacing injectors for. We already know they're worn...just not enough to be worth fixing yet. The injectors on this engine (8v DV6) are utter rubbish, it's not uncommon for all 4 to have been replaced within the warranty period! That's the nature of modern piezo injectors though...and is the price we have to pay for the extra accuracy and precision that they provide...or provided when new at least! 2 Quote Link to comment Share on other sites More sharing options...
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