1998 Toyota Sienna 1MZ-FE v6
Owned the van since new, just completed a full mechanical overhaul of the van.
Crate short block engine from Toyota
Fully rebuilt heads
New Catalytic Convertor
Entire coolant system
Entire timing system
New OEM IAC, PCV, MAF, FPR, Coils/wires/plugs, fuel pump, temp sensor, injectors cleaned, all 02 etc, etc
Basically everything under-hood is new, including most all additional non emissions parts (Rebuilt transmission, all mounts, entire steering system, entire suspension system, charging/starting system, A/C system, etc)
Engine properly broken in with break in formula oil, according to manufacturers specs. Oil exchanged for full synthetic after 1500 miles.
Have tried several times unsuccessfully to get the car to pass smog. It passes in all categories by a wide margin except for HC (Hydrocarbons).
California wants it to run up to 49 ppm @ 15 MPH, and a 31 ppm @ 25 MPH. I have only managed a 47ppm/49ppm, failing the 25 MPH test.
I’ve tried different grades of fuel, vehicle is 100% warmed up prior to testing with 30-45 minutes of driving.
Compression is perfect. Car has plenty of power, and idles so smoothly you can’t tell it is on.
No check engine lights, all readiness monitors set.
Pretty much out of ideas.
Have thousands into the repairs of this van, and due to the incredibly low standards for passing may not be able to register it here in the future.