The owner of a car with an N43 series engine approached me.
He had performed the diagnostics himself and detected that the cylinders No.3 and No. 4 injectors were leaking in closed condition. He replaced these two injectors with ones “professionally refurbished”, purchased via the Internet.
Unfortunately, the situation after repairs has become even worse. EML (Check Engine) is permanently lighted up un KOMBI. In the DME error message memory, the error messages regarding fuel mixture in both banks, some cylinder is regularly switched off, etc.
I won’t bother you too much with a complete set of data – this time, very concisely, exactly the adaptations of the injectors.
Idle, Stratified charge. The injector of cylinder No.4 is leaking strongly. The injector of cylinder No.3 has very poor atomization – this injector is not injecting the fuel but pouring it out.
And here – Stratified charge, partial load mode. The largest difference from the planned flowrate – again, injectors of cylinders No.3 and No.4
It is clear that these “refurbished” injectors are not usable. Flowrate difference reaches even 30 .. 40%; in idle, DME has to reduce/increase the length of the injection impulses 2 .. 3 times to achieve more or less correct mechanical efficiency of cylinders. Unfortunately, in Homogeneous mode, DME is not able to even out the fuel mixture (due to specifics of the algorithms, the creation of the adaptations in this mode is much slower), and as a result – open loop, turned off cylinders, etc.
Let’s look at the injectors themselves:
Both injectors:
a) have black bodies;
b) as if manufactured in the Year 2010;
c) are of the last – 11th release;
d) print fonts – more or less correspond to the original ones.
I want to add right away:
a) 11th release was not manufactured in the Year 2010;
b) 11th release has never been in black bodies.
The conclusion is simple – these injectors are China fakes.
But, this story does not end with a simple counterfeit. Each injector has a label with new, different encoding data, which (as if) confirms that the injector is refurbished.
Let’s compare the encoding data of the injectors, old vs new:
a) 211; 581 and 217; 575 (cylinder No.3);
b) 210; 582 and 209; 566 (cylinder No.4).
Do these new encoding data correspond to the parameters of the injectors? Of course, not!
Are these encoding data “closer” to the truth? Differences in the delay parameters (211 vs 217 and 209 vs 210) are close to 0. According to the encoding data, it turns out that the initial Delay data of the injector are close to the truth (for one injector – even coincide), but in reality – the difference is more than double!
Differences in the Flowrate data are slightly larger (575 vs 581 and 582 vs 566), but also here – new encoding data indicate a tiny difference from the initial data (the largest difference is 2.7%), but the actual situation shows a different “picture” – there is even 30 .. 40% difference.
Unfortunately, the conclusions are harsh – it looks like the “new” encoding data are completely fake. No one has measured these injectors. The labels with more or less similar data have been put on to imitate the “refurbishing”.
Another “success story”. But – why learn from the mistakes of others if you can make them yourself?
