So, I've been having a problem getting my 1MZ swapped MR2 to pass CA smog on a loaded dynamometer smog test. It's failed the 15mph test twice, but all other test values are very, very good.
I should note that there are some differences between my M/T 1MZ and a "true" Camry/Solara M/T 1MZ:
1) A/T 255cc 4-hole injectors (versus 245cc 2-hole M/T or Federal injectors)
2) 2x Air-fuel ratio sensors (versus heated oxygen sensors)
3) 1999 CA spec A/T ECU - 89661-06641 (versus 1999 M/T ECU - 89661-06631)
3a) CA spec A/T ECU ground switched to M/T; requires use of AFR sensors
4) Injen CARB legal IS2030 intake
4a) Ported heads
5) Walbro 255LPH/HP fuel pump for future upgrades
6) Stock returnless fuel setup
7) All OBDII readiness monitors set; no codes
8) Brand new, CARB legal Magnaflow 46005 2.25" catalyst
I bolded the above 3 things because I have a feeling they're causing some issues.
Now, the smog test results:
Round 1:
15 mph:
CO2% - 14.6
O2% - 0.2
HC (PPM) - 102 (max: 54)
CO% - 0.07% (max: 0.50%)
NO (PPM) - 87 (max: 430)
Result: FAIL
25 mph:
CO2% - 14.7
O2% - 0.2
HC (PPM) - 37 (max: 37)
CO% - 0.06 (max: 0.47)
NO (PPM) - 125 (max: 717)
Result: PASS (barely)
Magnaflow 46005 CARB cat; Shell 91 octane. P0171 5 minutes after leaving; exhaust leak at rear bank manifold pipe mating. Fuel trims were +38% and +27% on the rear and front banks, respectively, but not during the test.
Round 2:
15 mph:
CO2% - 14.5
O2% - 0.2
HC (PPM) - 130 (max: 54)
CO% - 0.11% (max: 0.50%)
NO (PPM) - 172 (max: 430)
Result: FAIL
25 mph:
CO2% - 14.6
O2% - 0.2
HC (PPM) - 37 (max: 37)
CO% - 0.06 (max: 0.47)
NO (PPM) - 158 (max: 717)
Result: PASS (barely)
Chevron/Shell 91 octane (mixed). I lost my fuel trim readings when I was testing the ECU terminals, but I'll post them after finishing adjusting my valve clearance.
Now, keep in mind the CA emissions ECU is tuned for a 3-catalyst setup, while I am only running one main catalyst as required by the M/T setup.
I checked my spark plugs - they're excellent. No unburned fuel, no oil, and no carbon. I checked my coils - all within spec.
I will use some old fashioned tricks to pass if necessary, but I just thought I'd pick your brains and see what you guys think.
Also keep in mind, my engine has less than 1000 miles on it after being rebuilt.
So, post your thoughts.
I should note that there are some differences between my M/T 1MZ and a "true" Camry/Solara M/T 1MZ:
1) A/T 255cc 4-hole injectors (versus 245cc 2-hole M/T or Federal injectors)
2) 2x Air-fuel ratio sensors (versus heated oxygen sensors)
3) 1999 CA spec A/T ECU - 89661-06641 (versus 1999 M/T ECU - 89661-06631)
3a) CA spec A/T ECU ground switched to M/T; requires use of AFR sensors
4) Injen CARB legal IS2030 intake
4a) Ported heads
5) Walbro 255LPH/HP fuel pump for future upgrades
6) Stock returnless fuel setup
7) All OBDII readiness monitors set; no codes
8) Brand new, CARB legal Magnaflow 46005 2.25" catalyst
I bolded the above 3 things because I have a feeling they're causing some issues.
Now, the smog test results:
Round 1:
15 mph:
CO2% - 14.6
O2% - 0.2
HC (PPM) - 102 (max: 54)
CO% - 0.07% (max: 0.50%)
NO (PPM) - 87 (max: 430)
Result: FAIL
25 mph:
CO2% - 14.7
O2% - 0.2
HC (PPM) - 37 (max: 37)
CO% - 0.06 (max: 0.47)
NO (PPM) - 125 (max: 717)
Result: PASS (barely)
Magnaflow 46005 CARB cat; Shell 91 octane. P0171 5 minutes after leaving; exhaust leak at rear bank manifold pipe mating. Fuel trims were +38% and +27% on the rear and front banks, respectively, but not during the test.
Round 2:
15 mph:
CO2% - 14.5
O2% - 0.2
HC (PPM) - 130 (max: 54)
CO% - 0.11% (max: 0.50%)
NO (PPM) - 172 (max: 430)
Result: FAIL
25 mph:
CO2% - 14.6
O2% - 0.2
HC (PPM) - 37 (max: 37)
CO% - 0.06 (max: 0.47)
NO (PPM) - 158 (max: 717)
Result: PASS (barely)
Chevron/Shell 91 octane (mixed). I lost my fuel trim readings when I was testing the ECU terminals, but I'll post them after finishing adjusting my valve clearance.
Now, keep in mind the CA emissions ECU is tuned for a 3-catalyst setup, while I am only running one main catalyst as required by the M/T setup.
I checked my spark plugs - they're excellent. No unburned fuel, no oil, and no carbon. I checked my coils - all within spec.
I will use some old fashioned tricks to pass if necessary, but I just thought I'd pick your brains and see what you guys think.
Also keep in mind, my engine has less than 1000 miles on it after being rebuilt.
So, post your thoughts.