Engine is smooth on CNG while knocks on Petrol

2007 TOYOTA COROLLA
68,000 MILES • 4 CYL • 2WD • MANUAL
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FAHDASLAM
  • MEMBER
  • 27 POSTS
Spark plugs changed, tappet adjusted, throttle serviced need ur suggestion. Hi 2carpros y it is so that car is smooth on CNG but rough on petrol?
Jun 30, 2012 at 12:14 PM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
Have you run a scan for a knock sensor fault as yet?
Jun 30, 2012 at 9:58 PM
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