I've posted on here before about the rich fuel trims (generally -15 to -20% using an ELM27 scan tool) and intermittent hesitations. No engine codes except for when I installed a replacement MAF sensor that was faulty. I have had the car in recently to the local Maserati dealership - using SD3 no problems found except for a fan resistor error code, so the resistor was replaced. Has anyone else used a scan tool to check their fuel trims because although its not bad enough to throw a code (needs to go over the +/- 25% threshold) I think it should ideally be +/- 10%. However, mechanics seem to ignore this clue unless it actually throws a error code.
Now, something I've noticed lately is that whenever I refuel, the hesitations occur reliably when driving away from the gas station. I feel a brief hesitation that lasts 1-2 seconds that repeats about every 5 seconds. However, after driving less than half a kilometre, the hesitations are gone. Googling this symptom, in other makes of cars, it seems to indicate a stuck open EGR valve. Is this something that could occur in the gransport? It could also explain the rich fuel trims maybe. I don't ink the charcoal canister has ever been changed but not sure what effect that could have.
Looking forward to getting your advice.
John
Now, something I've noticed lately is that whenever I refuel, the hesitations occur reliably when driving away from the gas station. I feel a brief hesitation that lasts 1-2 seconds that repeats about every 5 seconds. However, after driving less than half a kilometre, the hesitations are gone. Googling this symptom, in other makes of cars, it seems to indicate a stuck open EGR valve. Is this something that could occur in the gransport? It could also explain the rich fuel trims maybe. I don't ink the charcoal canister has ever been changed but not sure what effect that could have.
Looking forward to getting your advice.
John