Lately, I've been having what seems like issues associated with the case pressure relief valve.
Symptoms:
1) >3500 rpm in 1st gear, the pump will deplete the reservoir of enough fuel to run on 3 cylinders until fuel is replenished in the pump, then runs normal.
2) Recently, >3500 rpm in 1st, 2nd, or 3rd gear, in the recent colt temps, the pump will deplete the reservoir of enough fuel to run on 3 cylinders until fuel is replenished in the pump, then runs normal.
3) Recently, >2500 rpm WOT in 4th, the power feels flat when the ambient temps are cold (<50F)
Symptoms have gotten worse in the last week, seemingly associated with colder temps over the last 2 weeks. Most notably, symptoms 2 and 3 have surfaced.
I have replaced the fuel filter 2x in the last 2 weeks, just to make sure it's not fuel filter related. I have also recently removed the supply side check valve at the fuel tank. I was poking at it, when it snapped apart, committing me to removing it. Given that I live in a hilly area, I think I am going to replace it with a brass part, but relocate it to the hose that feeds the fuel filter.
Keep in mind, this is southern AZ: Anything <60F is cold to us!
I am thinking I need to look into the case pressure relief valve, that jsrmonster talks about in
this thread and that Drivbiwire details in
this thread. The symptoms seem quite similar to those discussed in
this thread.
Tony