97 F-150 4.6L Engine W ... spitting fuel vapors from throttle body.
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97 F-150 4.6L Engine W ... spitting fuel vapors from throttle body.
I recently purchased an F-150 that was sitting idle for about 1 year. I had to replace the battery, ignition coils, plugs and wires. I replaced fuel injectors and pressure regulator, as well as the driver's side cat. converter. I also replaced EGR tube and valve (as nut that mounts tube to exhaust manifold had rusted off.) I also replaced the thermostat (as temp gauge never registered any temp besides cold after 10 min. of run time and the upper radiator hose never got hot.) I replaced the EGR solenoid and sensor as well as the idle control solenoid on top of the throttle body. Also replaced the MAF sensor as I had initially had a code of P0102.
After about 5 minutes of run time, the idle drastically lowers (RPM lowers from 1000 to about 600) and the throttle body starts spitting vapor (fuel vapors) - had a lot of condensation of fuel in the whole air cleaner assembly...
I think there could be a vacuum leak (unmetered air) somewhere in the system. Was wondering if throttle body could be the cause or what else I should look for.
I've sprayed down the whole throttle body, upper intake manifold and any hoses and vacuum lines I could find with carb. cleaner and hoped to find the problem (figured the engine would rev up if I encountered a leak...) but found nothing - no increase in idle.
I am totally at a loss as to what to do at this point. The prev. owner is in the construction business and when the truck started "acting up" in his words, he just parked it. He had enough money to buy another (as he owned a Dodge Ram 1500) - He said he was driving the F-150 because it got much better fuel mileage. He was going to scrap it for 500 dollars, so I decided since I needed a vehicle and always wanted a truck, that I'd buy it from him.
I'm frustrated, but determined to figure out what is causing the loss of power and spitting of fuel vapors from the throttle body.
Any and all suggestions and help would be appreciated at this stage. It is a really nice truck, and I truly want to get it on the road soon!
After about 5 minutes of run time, the idle drastically lowers (RPM lowers from 1000 to about 600) and the throttle body starts spitting vapor (fuel vapors) - had a lot of condensation of fuel in the whole air cleaner assembly...
I think there could be a vacuum leak (unmetered air) somewhere in the system. Was wondering if throttle body could be the cause or what else I should look for.
I've sprayed down the whole throttle body, upper intake manifold and any hoses and vacuum lines I could find with carb. cleaner and hoped to find the problem (figured the engine would rev up if I encountered a leak...) but found nothing - no increase in idle.
I am totally at a loss as to what to do at this point. The prev. owner is in the construction business and when the truck started "acting up" in his words, he just parked it. He had enough money to buy another (as he owned a Dodge Ram 1500) - He said he was driving the F-150 because it got much better fuel mileage. He was going to scrap it for 500 dollars, so I decided since I needed a vehicle and always wanted a truck, that I'd buy it from him.
I'm frustrated, but determined to figure out what is causing the loss of power and spitting of fuel vapors from the throttle body.
Any and all suggestions and help would be appreciated at this stage. It is a really nice truck, and I truly want to get it on the road soon!
Last edited by jjriccardo44; Feb 13, 2014 at 05:03 PM.
