My 1uzfe out of a 93 LS400 failed emmissions at idle (590rpm). The max allowable Hydrocarbons is 220 PPM and 1098 was read. CO was measured a 0.54% (1.2% max allowable) The high speed (2500rpm) test passed at 173 PPM HC and 0.75%. Any Ideas what could be causing this?![Confused :confused: :confused:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png)
Info:
1. I did find a loose spark plug after the failed test. There was obvious signs of leakage aroung the plug.
2. The EGR is blocked off.
3. I have been running 87 octane gas.
Any ideas? Thanks!
Andrew
![Confused :confused: :confused:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png)
Info:
1. I did find a loose spark plug after the failed test. There was obvious signs of leakage aroung the plug.
2. The EGR is blocked off.
3. I have been running 87 octane gas.
Any ideas? Thanks!
Andrew