Question about 1992 Toyota Previa
Has the vehicle been overheating or losing coolant? The symptoms you describe could point towards head gasket trouble (and other faults). Often, the exhaust fumes from a car with a failing head gasket will smell 'pungent' and 'sharp'.
Check the oil on your dipstick. If there's a greyish/cream sludge - sometimes referred to as 'mayonnaise' - this points towards coolant entering the oil system via a leaking head/head gasket.
Also check your coolant - is there any evidence of engine oil in it? Although the mayonnaise on the dipstick is usually the tell-tale sign of gasket problems.
If you suspect the head/head gasket try a special sealant such as:
Posted on Jan 21, 2016
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Posted on Jan 02, 2017
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