First off, my EBPV
has been disconnected at the plug on the turbo pedestal for about a year with no ill effects. I had been under the impression that once disconnected, the valve and sensor were essentially turned off. This is true of the valve but not the sensor. If you search for info about the sensor you will find statements that the sensor may also control the fueling tables in the PCM
. Based upon my experience this is definitely true.
First off, here are the symptoms I was experiencing that led me to start searching for answers on here:
1. The truck would randomly shift into high idle after it was warmed up.
2. Intermittent weird idle. Not bad enough to be a concern on its own, but taken in conjunction with the other symptoms it indicated something was wrong. In fact, I initially blamed this on the gray cps
3. Mileage progressively getting worse.
4. SOTP feeling when the TC
locked up that the motor wasn't running as smooth as it should.
5. SOTP feeling that I'd lost some power along the way.
I did the Exhaust Back Pressure Sensor and Tube cleaning procedure found here on Guzzle's website:
Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page
Couple of notes on the above procedure: Next time I'll soak both tube nuts with PB Blaster before I start. The bottom one was especially tough to get off. I ran some wire through the tube but did not feel the need to roto-rooter it with a drill. I found it impossible to reinstall the tube from the bottom - I guess Guzzle is better at finding holes in the dark than I am
. I positioned the tube from the top, finger-tightened the bottom nut then connected the top nut.
What I found was the sensor orifice was more than half blocked with soot. More importantly, the sensor bracket was completely clogged with soot. Took more than a pipe cleaner to get it clean. I've attached pics of the sensor before cleaning and the bracket after cleaning. I should have snapped a pic of the bracket before cleaning it but I didn't realize how bad it was til I started digging into it.
Test-drive results...OMG, the gradual degradation in power and throttle response was worse than I thought
. Drives like a completely different truck.
Perhaps I wasn't searching using the correct terms, but it took me a while to come up with enough info to convince me to do this procedure. Hopefully, I titled this thread correctly and it will help some other guys out.
Also, I noticed in my search that a number of people asked where the plug for the EBPV
is. I've included a pic of it taken from the passenger side. It's white and has a piece of electrical tape on it.