2005 Grand Cherokee Limited
5.7L HEMI
Auto transmission
4WD
157,000 miles
This started about 2 years ago, we've had a couple mechanics look at it but weren't able to diagnose the issue and I wasn't real interested in paying them untold amounts of money to try everything under the sun.
1) When you fillup with gas, you can only get about .5gallon at a time to go in. There is a vacuum somewhere so you're just filling up the neck, letting it go down, and put in another half gallon at a time.
2) When you start the car AND it has been run within the last 6 hours, it will crank and crank and crank and crank. You have to push the accelerator pedal and pump it like a carb car and after about 3 seconds of doing that it will fire. If you turn the car off then back on within 10 minutes it's fine. But if it's longer than 10 minutes, and less than 6 hours, same issue occurs. If it sets longer than 6 hours it fires right up.
3) Rough idle and when it's really cold out (below freezing) the car will die when you come to a stop the first time, then you restart the car and it'll still be a rough idle but won't die again. We live on gravel and a stop sign a couple miles down the road with no traffic so when we drive down the road, stop, it dies, restart, and we're fine the rest of the trip so it hasn't been a safety issue.
What I have done:
Disconnected the tube going into the fuel vapor canister from the gas tank.
This allowed us to fillup with gas with no interruption but had no impact on the starting issue. It also causes the gas cap light to come on.
I reconnected that.
If I disconnect the 2 tubes going into the vapor recirculation solenoid up by the motor the 1 tube sucks air hard, the other doesn't. The tube sucking air goes to the motor (this all seemed legit). With this off the solenoid the above issues nearly go away but not completely. Idle is better, starts with just a slight tap of the gas pedal every time (as opposed to pumping the gas pedal for 3 seconds), and fills up with gas properly.
So I replace the solenoid and it didn't help at all. All the prior issues came back immediately as if I put the old solenoid back in.
I don't get a CEC light or anything like I would expect if the solenoid wasn't communicating with the computer.
Not real sure what to try now. With the car on and the solenoid tubes disconnected I tried blowing/sucking on the 2 ports on the solenoid that allows airflow and couldn't get any kind of airflow. With the car running the tubes disconnected it idles much better, as soon as I put the tubes up to the solenoid to reconnect them you get the rough idle instantly again.
It sure seems like air isn't moving through the solenoid even with a brand new one.
Any ideas on what I can try?
5.7L HEMI
Auto transmission
4WD
157,000 miles
This started about 2 years ago, we've had a couple mechanics look at it but weren't able to diagnose the issue and I wasn't real interested in paying them untold amounts of money to try everything under the sun.
1) When you fillup with gas, you can only get about .5gallon at a time to go in. There is a vacuum somewhere so you're just filling up the neck, letting it go down, and put in another half gallon at a time.
2) When you start the car AND it has been run within the last 6 hours, it will crank and crank and crank and crank. You have to push the accelerator pedal and pump it like a carb car and after about 3 seconds of doing that it will fire. If you turn the car off then back on within 10 minutes it's fine. But if it's longer than 10 minutes, and less than 6 hours, same issue occurs. If it sets longer than 6 hours it fires right up.
3) Rough idle and when it's really cold out (below freezing) the car will die when you come to a stop the first time, then you restart the car and it'll still be a rough idle but won't die again. We live on gravel and a stop sign a couple miles down the road with no traffic so when we drive down the road, stop, it dies, restart, and we're fine the rest of the trip so it hasn't been a safety issue.
What I have done:
Disconnected the tube going into the fuel vapor canister from the gas tank.
This allowed us to fillup with gas with no interruption but had no impact on the starting issue. It also causes the gas cap light to come on.
I reconnected that.
If I disconnect the 2 tubes going into the vapor recirculation solenoid up by the motor the 1 tube sucks air hard, the other doesn't. The tube sucking air goes to the motor (this all seemed legit). With this off the solenoid the above issues nearly go away but not completely. Idle is better, starts with just a slight tap of the gas pedal every time (as opposed to pumping the gas pedal for 3 seconds), and fills up with gas properly.
So I replace the solenoid and it didn't help at all. All the prior issues came back immediately as if I put the old solenoid back in.
I don't get a CEC light or anything like I would expect if the solenoid wasn't communicating with the computer.
Not real sure what to try now. With the car on and the solenoid tubes disconnected I tried blowing/sucking on the 2 ports on the solenoid that allows airflow and couldn't get any kind of airflow. With the car running the tubes disconnected it idles much better, as soon as I put the tubes up to the solenoid to reconnect them you get the rough idle instantly again.
It sure seems like air isn't moving through the solenoid even with a brand new one.
Any ideas on what I can try?
pump gas pedal to start
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