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1989 Honda Civic NOX readings on Emissions

Tiny
BKI7433
  • MEMBER
  • 1989 HONDA CIVIC
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
My car failed this years Emissions Test with a high NOX reading. My car is a 1989 Honda Civic HB with a 1.5 engine, 4spd. Does it have an EGR and where is it? What else may be the problem for a high NOX reading?

Please Help,
Keith
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Friday, October 1st, 2010 AT 6:57 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi bki7433,

Here are a list of possible causes.

Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

EGR valve is at rear of engine but 'I could not find any diagrams to indicate the location.
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Friday, October 1st, 2010 AT 9:18 AM

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