Hi Nery Uciel, all Vortec GM engines, although they have sequential injection, at the time of cold starts (by motor design and collectors) the fuel injection must be simultaneous, in order to guarantee a correct start, especially at low temperature. Nissan also uses the same cold starting strategy. The codes that are giving you mean that this simultaneous injection start strategy (in all cylinders does not continue ordering engine) is not being performed, so it costs a lot of cold start. The ECU Motor must therefore receive starting motor signal rotating (Start Signal) in the scanner and if the engine is cold = ING simulates = good game in cold. Therefore, in the scanner supplier to review this parameter (Start Signal), it usually this off. If you start the engine that signal must change to ON. If this does not happen, always OFF, check boot signal connection to the control unit. In summary, your system is trying to start cold with a hot game strategy, therefore it is poor fuel, so when you give it fuel because of the admission it starts immediately. In rare cases this code may also be due to a spoiled or non -original catalyst. Additionally I supply to review EVAP connections. When the problem solves, tell us, in any case, it is most likely that. I have personally seen this failure in several GM engines in V and Nissan because they use this cold starting strategy. Greetings cordials.
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