What would cause a 97 Pontiac sunfire to use more gas than normal and also auto zone codes p1441 and p1621?
P1441 Evaporative Emission System Flow During Non-Purge. P1621
PCM Memory Performance Take this car to a professional as this is
going to take some skill and knowledge to repair. Do not throw
parts at the problem. here's where you can find out what the codes
mean;
http://autorepair.about.com/cs/troubleshooting/l/bl_obd_main.htm
This is interesting. I assume the original poster's warning lights
were on, but can there be issues for which a code is generated but
nothing lights up on the dashboard? I think I'm using a lot of gas
in my 2003 2.2L but I don't have any warning lights on. Phil I
think the two codes being returned have a system in common - the
vacuum system/Evaporative recovery system. Evap. (vapor cannister)
code MAY be as a result of excessive fuel flow into the cylinders
overloading the cannister's capacity. Possible cause is a failing
Oxygen sensor giving a "Lean" indication to the engine computer,
causing more fuel than is needed to be injected into the cylinders
and captured by the vapor system. Trying to keep track of the
changing readings may be taxing the computer's memory. Have the
oxygen sensor checked. If it is functioning correctly, check for
vacuum leaks, cracked or broken vacuum hoses.