Before I jump into the problem, I guess I should start with an introduction. I am new to the forums. I have done tons of research but decided to join this forum to try and solve a problem that is so far outwitting me. My girlfriend has a 2006 Kia Rio. It is a base model with an automatic transmission. I'd like to say it's been a good car, but it hasn't. It's been a constant flow of problems. This problem has been a nagging one for about a year now.
Every time the car gets refueled, it will not start unless you pump the gas pedal and crank it for about a minute, then you have to keep revving the engine for about a minute or it will immediately stall out and sometimes backfire. However, if you turn the car off but then put the key back to the on position before fueling it does not do this. As a side note there are no problems pumping gas, the pump doesn't shut off prematurely or spit back or anything like that.
Also there are two intermittent most likely related problems. The first is that sometimes the car will not start. It won't crank at all, like an anti-theft feature almost. The dash lights come on, but the starter will not engage, and after turning the key back and forth 20 or 30 times sometimes it starts. Sometimes taking the gas cap off or pumping the gas pedal will help but sometimes it still won't start. The other intermittent problem is a misfire while driving. It usually occurs at idle and speeds under 45, I don't notice it on the highway. It almost seems like pre-detonation. It sometimes happens in quick succession and can be pretty violent, and sometimes it is very subtle and only stumble once or twice.
So far in my research I have found that the canister close valve and canister purge solenoid can cause similar issues. The purge valve is under the hood and the close valve is near the tank (if I remember that right). I replaced both to no avail. There is no check engine light on. The only things I can think of are that one of the valves I replaced was faulty out of the box, or the fuel tank pressure sensor is bad, hence the deactivation of the starter, and maybe if it is sending an improper pressure reading to the ecm it is cause flooding and making the car misfire? Rather than replace more parts I'd like some troubleshooting ideas though. Anyone care to take a stab at this one?
Every time the car gets refueled, it will not start unless you pump the gas pedal and crank it for about a minute, then you have to keep revving the engine for about a minute or it will immediately stall out and sometimes backfire. However, if you turn the car off but then put the key back to the on position before fueling it does not do this. As a side note there are no problems pumping gas, the pump doesn't shut off prematurely or spit back or anything like that.
Also there are two intermittent most likely related problems. The first is that sometimes the car will not start. It won't crank at all, like an anti-theft feature almost. The dash lights come on, but the starter will not engage, and after turning the key back and forth 20 or 30 times sometimes it starts. Sometimes taking the gas cap off or pumping the gas pedal will help but sometimes it still won't start. The other intermittent problem is a misfire while driving. It usually occurs at idle and speeds under 45, I don't notice it on the highway. It almost seems like pre-detonation. It sometimes happens in quick succession and can be pretty violent, and sometimes it is very subtle and only stumble once or twice.
So far in my research I have found that the canister close valve and canister purge solenoid can cause similar issues. The purge valve is under the hood and the close valve is near the tank (if I remember that right). I replaced both to no avail. There is no check engine light on. The only things I can think of are that one of the valves I replaced was faulty out of the box, or the fuel tank pressure sensor is bad, hence the deactivation of the starter, and maybe if it is sending an improper pressure reading to the ecm it is cause flooding and making the car misfire? Rather than replace more parts I'd like some troubleshooting ideas though. Anyone care to take a stab at this one?