Engine Not Stopping

[rpc86]

Hi everyone,

I am new here.

I know that is silly to say that I have a Toyota Corolla 1978 model with 4K engine. But I love this car. My problem is, when I use my car with aircon switch on and traveling for 2 hours, it does not stop quickly when I switch it off. The engine is still alive and the whole front-part of the car is shaking and will last for a minute.

I need to know what's the problem of my car.

Thank you very much and I hope you can help me, though my car is old.

[C-man]

How much has the engine been driven? Sometimes, when the engine is old (and leaking from piston rings), the engine keeps on running with gases from crankshaft casing. Also, in 4K the inlet and exhaus manifolds are one on the other, and it makes starting the engine hot very difficult.

Hope I could explain this in english.

[GT4 BOOSTER]

its called pre ignition possibly due to incorrect timing setttings , also caused by a bad build up of carbon on the piston crowns , have someone !Removed! the timing and buy some decoker from a motorist shop.