barno92
New member
Your claim is that flooding one cylinder caused a burned piston and a catalytic convertor failure. Based on the information and pictures provided, that is a highly unlikely scenario, even if the vehicle was drive for a prolonged period in this condition.
The pictures provided by you show the middle cylinder of a V6 engine with a burnt piston. The pictures do not show damage to the piston rings or to the piston crowns in the cylinders on either side of the damaged piston.
High combustion chamber temperature accompanied by severe detonation in the cylinder concerned will cause this type of damage and potentially, damage to the catalyst due to excessive temperature. A temperature damaged catalyst can also cause the detonation, but in this case it appears that the detonation was not caused by a damaged catalyst as it was confined to one cylinder, where the catalyst is connected to three cylinders, so it is reasonable to expect similar damage to the other two pistons in the case of catalyst failure causing the piston failure.
Therefore the most likely scenario is that excessive combustion temperature in the cylinder concerned caused the piston failure and the consequent catalyst failure.
Excessive cylinder temp is commonly caused by insufficient fuel being delivered or poor quality fuel. A spark plug, ignition energy level or ignition control issue can also cause detonation and high temperature. In the case of low system pressure caused by supply issues (pump, filters etc) it is reasonable to expect the problem to show in the majority of the cylinders. The pictures and narrative suggest that the problem was limited to one cylinder, so it is reasonable to assume that fuel supply was not the primary cause.
This could be the result of a failed (blocked or failing to open) injector, a damaged or incorrect grade spark plug, incorrect capacity injector, disconnected injector etc. It is highly unlikely that flooding the cylinder with fuel due to an injector stuck open could cause this type of failure.
We did supply a new injector at our cost immediately upon your request and if I am correct, your position is that the injector fixed the issue, but that the piston and catalyst were already damaged from driving the car with a ‘stuck open’ injector. At our cost, you sent the ‘failed’ injector to Deatschwerks, a Bosch Authorised Injector Specialist for testing. Deatschwerks reports that the injector returned operates to the Bosch specification for that part, and is not faulty in any way.
Therefore, in light of the type of damage reported and that fact that the returned injector operates within Bosch specification as tested by a qualified independent shop, Sprintex is unable to accept that the injector supplied with the system caused this issue. What is far more likely to cause this type of damage to one cylinder of the engine by installing this system, is that during the install, the injector for the cylinder in question was not changed, and the original injector remained fitted to that cylinder. This would have the effect of making the one cylinder about 30% ‘lean’ (not enough fuel delivered) causing both high combustion temperature and detonation or pre-ignition. The damage to the piston pictured is consistent with that scenario, and it is likely that the catalyst would also be damaged by this high temperature combustion from that one cylinder in such a case.
The pictures provided by you show the middle cylinder of a V6 engine with a burnt piston. The pictures do not show damage to the piston rings or to the piston crowns in the cylinders on either side of the damaged piston.
High combustion chamber temperature accompanied by severe detonation in the cylinder concerned will cause this type of damage and potentially, damage to the catalyst due to excessive temperature. A temperature damaged catalyst can also cause the detonation, but in this case it appears that the detonation was not caused by a damaged catalyst as it was confined to one cylinder, where the catalyst is connected to three cylinders, so it is reasonable to expect similar damage to the other two pistons in the case of catalyst failure causing the piston failure.
Therefore the most likely scenario is that excessive combustion temperature in the cylinder concerned caused the piston failure and the consequent catalyst failure.
Excessive cylinder temp is commonly caused by insufficient fuel being delivered or poor quality fuel. A spark plug, ignition energy level or ignition control issue can also cause detonation and high temperature. In the case of low system pressure caused by supply issues (pump, filters etc) it is reasonable to expect the problem to show in the majority of the cylinders. The pictures and narrative suggest that the problem was limited to one cylinder, so it is reasonable to assume that fuel supply was not the primary cause.
This could be the result of a failed (blocked or failing to open) injector, a damaged or incorrect grade spark plug, incorrect capacity injector, disconnected injector etc. It is highly unlikely that flooding the cylinder with fuel due to an injector stuck open could cause this type of failure.
We did supply a new injector at our cost immediately upon your request and if I am correct, your position is that the injector fixed the issue, but that the piston and catalyst were already damaged from driving the car with a ‘stuck open’ injector. At our cost, you sent the ‘failed’ injector to Deatschwerks, a Bosch Authorised Injector Specialist for testing. Deatschwerks reports that the injector returned operates to the Bosch specification for that part, and is not faulty in any way.
Therefore, in light of the type of damage reported and that fact that the returned injector operates within Bosch specification as tested by a qualified independent shop, Sprintex is unable to accept that the injector supplied with the system caused this issue. What is far more likely to cause this type of damage to one cylinder of the engine by installing this system, is that during the install, the injector for the cylinder in question was not changed, and the original injector remained fitted to that cylinder. This would have the effect of making the one cylinder about 30% ‘lean’ (not enough fuel delivered) causing both high combustion temperature and detonation or pre-ignition. The damage to the piston pictured is consistent with that scenario, and it is likely that the catalyst would also be damaged by this high temperature combustion from that one cylinder in such a case.
