Engine 'surging' during SMOG test

Tiny
MARTYNW
  • 1993 JAGUAR XJS
  • 173,000 MILES

My car failed SMOG a few weeks back (the Hydrocarbons were too high). I just had 2 new catalytic converters put in and I took it for a retest. The tester was not able to keep it within range of required speed as they say the engine kept 'surging.' What could be wrong? This problem didn't seem to be there for the first test.

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Friday, August 26th, 2011 AT 6:56 PM

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Tiny
DOCFIXIT
  • EXPERT
  • 18,988 POSTS

Have O2 sensors checked if they are not providing correct air/fuel info computer will hunt and cause surge

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Friday, August 26th, 2011 AT 7:11 PM

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