Hello all,
I'm at my Wit's End with engine hesitation and pinging (i.e running lean) complicated by having a supercharger installed by the previous owner (who owned a Toyota dealership).
It has:
I'm working from home due to COVID, so I thought what a great opportunity to learn new welding skills and install a 3-inch over-frame exhaust.
Well, this doesn’t seem to be getting any better with time, so here I am.
I'm at my Wit's End with engine hesitation and pinging (i.e running lean) complicated by having a supercharger installed by the previous owner (who owned a Toyota dealership).
It has:
- Walbro 255 fuel pump
- TRD Fuel Pressure regulator
- I always run high octane gas
I'm working from home due to COVID, so I thought what a great opportunity to learn new welding skills and install a 3-inch over-frame exhaust.
- Due to the style of the downpipe, I had to weld bung type fittings. I did a ton of research on the proper O2 sensors (this is highly debated) but I settled on Denso 234-9042 Air Fuel Ratio Sensors (I think they are as closest to OEM I can get)
- I also installed new plugs ( wires, distributor cap, rotor, Denso Spark Plug Kit for Boosted 1FZs & FZJ80s) actually from wit's end
- New K&N filter
- New OEM fuel filter
Well, this doesn’t seem to be getting any better with time, so here I am.
- No codes (other than ABS code 35 (front left or rear right sensor)? I don’t think its relevant to this, but I cant explain because it wasn’t present before I started this endeavor.
- I can’t find any issues with the vacuum lines
- If I disconnect the vacuum line from the fuel pressure regulator it runs better. This is for diagnostic purposes, I will not leave it that way.
- The new headers eliminate the ERG port, so I thought it might be the EGR temp sensor (I did the 1 ohm resistor bypass and BB EGR delete). This actually made things worse.
- To rule out bogging down due to shifting issues, I made sure the transmission fluid was adequate.
- There is a lot of discussion about a 7th injector and I might do that too someday, but like I mentioned it was running fine before all this work.