This evening when I pulled into the driveway I had the windows down and noticed a strange cyclic sound coming from my X. The only way to describe it is "pfft pfft pfft pfft pfft". (I know that sounds silly but it's the only way I can describe it) It was constant and was rapid. I kinda sounded like a small exhaust leak I thought at first.
When I opened the hood I found that the sound was coming from the throttle body area. I also heard a rapid clicking sound that was in sync with the "pfft" sound. I quickly found that the clicking was coming from the evap purge solenoid. It was cycling open and shut very fast and continuously. I followed the hose that goes from the solenoid to the intake right next to the throttle body and found the "pfft" sound was caused by the vapors rushing into the intake every time the solenoid opened. To be sure I squeezed the hose to cut off flow and the sound went away.
I am aware that on very hot days when the vehicle is really baking alot of fuel vapors can build up and cause the solenoid to open and close very rapidly. However I've never heard the cyclic "pfft" sound before.
A few things about the truck: over the last few weeks it will sometimes idle a bit rough and other times its nice and smooth. The rpms are erratic too. Sometimes at a stop it idles at 625, then a few stops later it sits at 750 and other times its somewhere in between. Lastly, I cannot fill the truck with fuel normally. I have to pump the gas very slow or it will spurt out and shut off the pump nozzle. I believe there's a known issue with the canister vent valve on these trucks that causes the gas fill problem but I'm not 100% sure. Oh, and of course, there are no codes or pending codes.
Im wondering if all these symptoms may be related. The rough idle, random idle speed, purge solenoid cycling very fast, the very loud "pfft" sound coming from the evap hose every time vapors rush into the intake and the fuel fill problem.
I looking for any help you guys can give on this one. Perhaps someone has dealt with these symptoms before? Any advice would be greatly appreciated.
Sorry for the super long post. I hope at least yall got a laugh out of how many times I wrote "pfft".
When I opened the hood I found that the sound was coming from the throttle body area. I also heard a rapid clicking sound that was in sync with the "pfft" sound. I quickly found that the clicking was coming from the evap purge solenoid. It was cycling open and shut very fast and continuously. I followed the hose that goes from the solenoid to the intake right next to the throttle body and found the "pfft" sound was caused by the vapors rushing into the intake every time the solenoid opened. To be sure I squeezed the hose to cut off flow and the sound went away.
I am aware that on very hot days when the vehicle is really baking alot of fuel vapors can build up and cause the solenoid to open and close very rapidly. However I've never heard the cyclic "pfft" sound before.
A few things about the truck: over the last few weeks it will sometimes idle a bit rough and other times its nice and smooth. The rpms are erratic too. Sometimes at a stop it idles at 625, then a few stops later it sits at 750 and other times its somewhere in between. Lastly, I cannot fill the truck with fuel normally. I have to pump the gas very slow or it will spurt out and shut off the pump nozzle. I believe there's a known issue with the canister vent valve on these trucks that causes the gas fill problem but I'm not 100% sure. Oh, and of course, there are no codes or pending codes.
Im wondering if all these symptoms may be related. The rough idle, random idle speed, purge solenoid cycling very fast, the very loud "pfft" sound coming from the evap hose every time vapors rush into the intake and the fuel fill problem.
I looking for any help you guys can give on this one. Perhaps someone has dealt with these symptoms before? Any advice would be greatly appreciated.
Sorry for the super long post. I hope at least yall got a laugh out of how many times I wrote "pfft".