Passed CA Emissions

[Z51JEFF]

Well,just got back from my friendly neighborhood smog nazi and my Haibeck chipded,other wise 100% stock 18,000 mile 1991 ZR-1 FAILED!On NOX I think its 702 with a 502 max.So whats my solution here guys?Drove the car for 20 miles right to the smog station.Stock chip,octane booster and what brand of gas Im not sure.How do I get this this thing to pass?

[Hib Halverson]

Originally Posted by Z51JEFF

Well,just got back from my friendly neighborhood smog nazi and my Haibeck chipded,other wise 100% stock 18,000 mile 1991 ZR-1 FAILED!On NOX I think its 702 with a 502 max.So whats my solution here guys?Drove the car for 20 miles right to the smog station.Stock chip,octane booster and what brand of gas Im not sure.How do I get this this thing to pass?

Wow...that's failed by a ton!

Unfortunately, if the engine is running right, 90-92 owners have few options as far as EGR because they don't have an EGR valve. Plus the State of California wants to force old cars off the roads and one way it does that is by lowering the emissions limits which has been done at least twice since 1995.

First, stop using octane booster. Few of them are effective and the ones that are (which use MMT as the active ingredient) can damage your cat converters.

Specifically, what brand of octane booster have you been using?

Secondly, I'd inspect the engine looking for anything that will increase combustion temperature which raises NOx emissions. Check the engine over and report back to the forum on your findings?

Lastly, can you post the full results of your test?

[Z51JEFF]

Originally Posted by Hib Halverson

Wow...that's failed by a ton!

Unfortunately, if the engine is running right, 90-92 owners have few options as far as EGR because they don't have an EGR valve. Plus the State of California wants to force old cars off the roads and one way it does that is by lowering the emissions limits which has been done at least twice since 1995.

First, stop using octane booster. Few of them are effective and the ones that are (which use MMT as the active ingredient) can damage your cat converters.

Specifically, what brand of octane booster have you been using?

Secondly, I'd inspect the engine looking for anything that will increase combustion temperature which raises NOx emissions. Check the engine over and report back to the forum on your findings?

Lastly, can you post the full results of your test?

Cars running great with no VAC leaks or any problems.Is it possible the TECH got something fouled up with the test,the guy had a hard time getting a steady RPM reading,it was jumping around between 660 to maybe low 730 with no noticeable jumping idle in the motor.The guy did change the plug wire lead between #1 and other plug wires on the left bank.This is the second time Ive takin the car to this shop for the smog,these guys know Im a pain in the a$$ when it comes to the car so they are pretty patient with me so Ill take it back maybe Friday.Just changed the oil.Im going to clean the air filter and did get some octane booster,never used the stuff but will now if it helps.Ill give this a shot posting the results,might get jumbled.at 15 MPH,1276 RPM CO2 MEAS 14.30 02[%] MEAS 0.68 HC[PPM] MAX 78 AVE 38 MEAS 13 CO[%] MAX 0.72 AVE 0.08 MEAS 0.01 NO[PPM] MAX 545 AVE 261 MEAS 488.-25 MPH,RPM 2067 CO2%14.20 MEAS 0.82 HC[PPM] MAX 61 AVE 30 MEAS 9 CO[%]MAX 0.60 AVE 0.07 MEAS 0.00 NO[PPM] MAX 502 AVE 233 MEAS 702.