Any reason why when using higher octane gas, more than 93, cold starts are rough, even after 1 hour of the car resting I would get rough starts ?
When reverting back to Chevron 93 I dont have this problem the starts are instant whereas i dont even hear the starter swing at times.
Shell 93 sometimes gives me rough starts, however race gas straight or mixed gives me rough and long crank starts.
The way i work around it is to pump the gas pedal twice to get instant starts to avoid the long cranks, but even so the starts sound like the car is barely catching itself.
Only one time the "possible fuel pump" code got showed up.
When reverting back to Chevron 93 I dont have this problem the starts are instant whereas i dont even hear the starter swing at times.
Shell 93 sometimes gives me rough starts, however race gas straight or mixed gives me rough and long crank starts.
The way i work around it is to pump the gas pedal twice to get instant starts to avoid the long cranks, but even so the starts sound like the car is barely catching itself.
Only one time the "possible fuel pump" code got showed up.