Emissions Test

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Mar 27, 2014 | 03:43 PM

Kamil Kwarciak

Thread Starter

Junior Member

Joined: Mar 2014

Posts: 1

Emissions Test

Hello ive got a 1992 honda civic vx, it hasnt passed etest in 5 years now it has a 1.5 d15z1 motor 400,000 km , on the test is fails with high HC ( high Hydrocarbon ) anyone have any idea on how to lower it ???

thanks

Mar 28, 2014 | 01:50 AM

itburnswhenIP

HCF Member

Joined: May 2013

Posts: 722

What causes high HC. What causes high Hydrocarbon - SmogTips.com. Failed HC Emissions. Why did my car fail the emission test for high HC emissions. What is HC. My vehicle failed the emission test for high Hydrocarbons. Why my car produced high HC. Hi

Last edited by itburnswhenIP; Mar 28, 2014 at 01:52 AM.

Mar 28, 2014 | 01:03 PM

mk378

Recognized HCF Member

Joined: Jun 2007

Posts: 10,023

Is the Z1 the original VX engine type? The VX was a special setup and you can't mix parts from other models (e.g. the engine and ECU must match. It also used a special wideband oxygen sensor).

Overcooling the engine (thermostat stuck open or wrong thermostat) will cause the ECU to never enter closed loop mode, which means high emissions.

If you have a proper setup, no misfiring, and also elevated (higher than normal though not necessarily failing) CO and NOx, its likely that the catalytic converter is worn out and needs replacing.

Last edited by mk378; Mar 28, 2014 at 01:05 PM.