1996 Toyota Corolla HC failed in smog test

Tiny
PENGUIN
  • MEMBER
  • 1996 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 153,000 MILES
My 96 corolla failed for 15 mph test; HC max is 64 and measure is 69. Other readings are fine.

15 mph
HC (MAX-64, AVE-9, MEAS-69)
CO (MAX-0.55, AVE-0.02, MEAS-0.17)
NO (MAX-477, AVE-57, MEAS-190)

25 mph
HC (MAX-47, AVE-7, MEAS-39)
CO (MAX-0.54, AVE-0.03, MEAS-0.11)
NO (MAX-764, AVE-50, MEAS-130)

With 150K, the car is running as good as day 1. What could cause the high HC measure?

Any input will be appreciated
Do you
have the same problem?
Yes
No
Sunday, July 13th, 2008 AT 11:14 PM

1 Reply

Tiny
DOCHAGERTY
  • EXPERT
As a smog technician myself, the reason the hydrocarbons are high is because the ignition system is not able to deliver an adequate spark either due to worn or improperly gapped spark plugs or to components that require replacement such as ignition wires or distributor cap/rotor.
Was this
answer
helpful?
Yes
No
+2
Monday, July 14th, 2008 AT 1:28 AM

Please login or register to post a reply.

Sponsored links