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Chris (aka-Moose)
Chris (aka-Moose), Auto Technician
Category: Toyota
Satisfied Customers: 947
Experience:  16 years of experience
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What is causing my toyota corolla AE110 5A-FE engine to

Customer Question

what is causing my toyota corolla AE110 5A-FE engine to ping?
Submitted: 1 year ago.
Category: Toyota
Expert:  Genchi Genbutsu replied 1 year ago.

Thank you for allowing me to help you with this concern today and am sorry to hear that this is happening. I will have to ask you a few questions so that I can get a better understanding as to what may be going on with your Corolla.

Was it pinging before the tbelt replacement?

Was the reason for replacing the timing belt in order to get it to stop pinging?

Customer: replied 1 year ago.
it was pinging before the timing belt was changed got it changed timed the engine but the pinging never stoped
Expert:  Genchi Genbutsu replied 1 year ago.

Did you perform the work yourself or used a repair shop?

What else have you tried to resolve this?

Customer: replied 1 year ago.
i thought as it reached 100000km was the reason for the pinging but at the end the pinging continued
Customer: replied 1 year ago.
my mechanic did the job used a timing light to time it
Customer: replied 1 year ago.
what number is ***** to time the 5A-FE engine?
Customer: replied 1 year ago.
he timed it on 8
Expert:  Genchi Genbutsu replied 1 year ago.

I see. The pinging is caused by pre-detonation and here is a video explaining more about whats going on inside the engine to cause this noise. I started it at 2min 12sec because that where it gets to the gist of whats important. You can watch the whole thing if needed.

The repair manual states 10 deg BTDC +/- 2 degrees. So you have some play there and is where I would start. Try 10 and if needed 12 deg to see if the pinging goes away which it should. If not, then carbon build-up or gas is where to look toward next. Does this make sense?