I am maintaining my aunt's Toyota Corona 1.8L liftback (3T engine). The year of manufacture for the car is 1981. The mileage of the car is approximately 147,000 miles.
Recently, three of the four cylinders are firing correctly, cylinder no. 4 is firing very weakly. When I pull out the spark plug cable from the no. 4 cylinder, there is very little change in the engine idling speed. However, if any other spark plug cable is pulled, there is a noticeable difference in the engine idling.
I have done the following:
Top overhaul and replaced all eight valves,
Swap the spark plug with a new one(problem still there),
Serviced the carb,
Swap spark plug cables between nos three and four(problem still there),
Changed the ignition coil (Nil fix),
Spark plugs cleaned, regapped and swapped (between nos 3 and 4 - problem still there).
Is there anything else I need to do to correct this problem?
Thanking you in advance and Happy New Year.
have the same problem?
Saturday, December 30th, 2006 AT 3:45 AM