I'm trying to find this problem and I believe that is a vacuum leak. It started as a minor abnormal engine vibration and it grew to be a hot rod earthquake. Also the car smells like gas and the RPM stay on or about 1000 RPMS when I let go of the throttle and of course a pronounced MPG drop. Used to get about 390 to 450 miles to the tank and now I get about 330 if I'm lucky.
Just looking to see if anybody had this experience. I pulled the codes before and they read:
P1174 Fuel Trim Adaptation Additve Bank 1 Malfunction
P0505, Idle Control System Malfunction
I basically changed everything except the O2 sensors and the problem has not gone away. I boght a new ICV and it still acts the same. Just wanted to know if anybody had any experience that they can share on this subject.
eh I don't know about propane, i doubt I would try it. I know it is carb cleaner or some simliar can'd pressurized spray. Also keep in mind to move the can slowly, because it takes a second for the engine to respond, so if you move the can too quickly then the source of the leak will be behind where you were currently spraying. Good luck.
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