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Hello, Thomas. Check the knock sensor. This sensor is suppose to send signal to
the computer if the engine start to knocking or pinging. The computer will
change the setting on various other components to keep from doing this knocking
or pinging. I remember in the older cars that weren't fuel injected but
carbureted and had to burn high octane fuel. If one put low octane in the fuel
tank the engine would knock/ping, and continue to run after the ignition was
turned off. Try the knock sensor or do an diagnosis test on it. Look in your
owner manual it tell how to self diagnosis test on you car. GB....stewbison
Hello! That is a significant change...I'll need a little clarification...Is the Check Engine Light (CEL) flashing?...Tell me how the engine is running...Do you see any smoke (blue or black) out of the exhaust?... Is the engine hard starting, idle poorly, hesitate or stall?...
If the CEL is flashing I'll send the procedure to identify the trouble code/codes that the Electronic Control Unit (ECU) has stored...
1)new spark plugs properly gapped.
2)new air filter (check every 35000 miles)
3)new fuel filter (every 35000 miles)
4)1 bottle of STP fuel treatment (red bottle) 4x a year.
5) oil and filter change (castrol or another good quality oil every 3-4000 miles.
6)proper air pressure in tires (check every 2 months
7) service transmission every 40000 miles or less.
New oil and filter
8) new plug wires every 80000 miles.
90000 km service includes changing.spark plugs,oil and oil filter,gearbox fluid,brake fluid ,air filter and fuel filter if needed,a full safty inspection.and the most important timing belt,and while your doing the timing belt you should do the water pump.
first i would cover the basics. change the fuel filter, next change the spark plugs, careful this car takes special spark plugs. probably have to get from toyota. next clean the throttle body, pull air nozzle off and open the butterfly so you can spray throttle body cleaner in their and clean with toothbrush. also dont be alarmed after cleaning the throttle body and changing the fuel filter it will be hard starting, hold the gas pedal half way.