WHITE SMOKE FROM ENGINE ONLY ON PETROL

MIANJAN95

MEMBER
2001 TOYOTA COROLLA
4 CYL
AUTOMATIC
162,000 MILES

Hi my car is giving white smoke continuously not only on startup. This only happens if car is running on petrol on cng (compress natural gas) the car is fine and no smoke I even changed the engine oil to Havoline 20w50 but still the problem is not solved

7 Replies

HMAC300

MECHANIC
48,601 POSTS

Have the coolant system pressure checked for a head gasket leak.

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Thursday, October 2nd, 2014 AT 5:37 AM

MIANJAN95

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4 POSTS

Gasket is fine I have done the tests and there is no leak any other idea

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Thursday, October 2nd, 2014 AT 6:01 AM

HMAC300

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The only other thing that I cold think of is that the pcv system may not be working right and causing this. White smoke is usually an indication of water or coolant leakage. So check yoru pcv valve to see if it's working properly. Other than that I can't think of anything

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Thursday, October 2nd, 2014 AT 6:32 AM

MIANJAN95

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4 POSTS

Could this be the piston ring problem? They are damaged or weak?

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Thursday, October 2nd, 2014 AT 6:35 AM

HMAC300

MECHANIC
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If it were a piston ring problem the it would do it all the time. YOu can test compression though and if there is a 20% variance between any cylinder than it may be of concern but I kind of doubt it. The thing is when you switch between petrol (gas) and CNG you are going from a liquid to a gas so it may be something in the fuel as well causing it.