GON
$100 Site Donor 2024
Used a smoke machine for the first time, with hopes of finding the cause of a P0171 error.
A few things, the cheap machine I purchased requires a air compressor to deliver the smoke. The other think is a good flashlight is required to see the smoke. I actually did the smoke in the dark, so I could best see the smoke, which wasn't easy.
Unfortunately- I think I found the leak. Around the egr area of the 5.4l 4v Intech engine. This requires the removal of the intake plenum to inspect. Not happy, as when the engine was replaced the EGR valave was supposed to be replaced. I speculate the installer did not use a gasket between the EGR valve and the intake manifold.
The vacuum leak is causing high fuel trim on bank 1.
A few things, the cheap machine I purchased requires a air compressor to deliver the smoke. The other think is a good flashlight is required to see the smoke. I actually did the smoke in the dark, so I could best see the smoke, which wasn't easy.
Unfortunately- I think I found the leak. Around the egr area of the 5.4l 4v Intech engine. This requires the removal of the intake plenum to inspect. Not happy, as when the engine was replaced the EGR valave was supposed to be replaced. I speculate the installer did not use a gasket between the EGR valve and the intake manifold.
The vacuum leak is causing high fuel trim on bank 1.