Having problems with your 1991 Toyota Corolla ?

My corolla pings alot ignition timing set good timing belt placed properly new cylinder head gasket car mileage 245489

Posted / edited by AnonymousUser on : 13-08-2018

Answers :

Number of possibilities.
One rare situation is that accumulated carbon in the head can increase compression and require a switch to premium gas.
Another is that the compression is supposed to be high but that they count on the EGR to poison the mixture enough to prevent it. So a malfunctioning EGR can cause ping.
Another is that the in some cars, the centrifugal or vacuum advance can be weak and cause timing to be too advanced when reved up.
Most cars also have a knock sensor that is supposed to automatically prevent ignition timing advance if the fuel is not up to it, and it could be bad.

First thing I would try is a tank full of premium, or an octane additive. Then I would try backing off the ignition timing, regardless of what the spec says it is supposed to be. I would also check the timing with all hoses on, with a strobe light, and at high RPM, to check advance.

Its pinking ,timing too far advanced or it doesnt like 95 octane when it was designed to run on 97 octane so put the 98 unleaded in ,if it wasnt built specific for the american market then the compression is higher and 98 should cure ,set timing to 6º if it has a distributor to turn ,another year and it will be a classic
Repair Help & Product Troubleshooting for 1991 Toyota Corolla

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