Question about 2008 Chevrolet Silverado 1500 2WD
It could be an injector, although unusual on a car so young. Perhaps also check the fuel pressure relief valve FPR and also the coil set. The coil set can be checked by looking at the quality of spark exhibited by each spark plug when taken out in turn and held against the car frame or engine block. To check the FPR have the engine warmed up at idle. Detach the vacuum line to it. The engine should speed up for a couple of seconds and then drop in revs and start to run roughly. If this happens your FPR is fine and you can reconnect the vacuum line. If the engine fails to speed up momentarily then this could indicate a fault. If you can, block the vacuum line to the inlet manifold and connect a tube to the FPR and **** on it (to create and artificial vacuum. The engine should become slower and laboured at full vacuum. If no vacuum can be sustained than the FPR will need to be replaced. To clean the suspect injector back flush it. This is an important principle that if you suspect anything getting blocked in one direction then the way to clear it is to apply pressure in the opposite direction. Back flush onto a cotton towel and if there is debris then do the same to the other injectors as a precaution.
Posted on Sep 30, 2010
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Posted on Jan 02, 2017
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