Pinging sound: 1996 Toyota Corolla (1.6 L) Auto Trans.

Tiny
TIMOTHY1027
  • MEMBER
  • 1996 TOYOTA COROLLA
This car has high mileage (181,778) but has been well cared for. It runs great, plenty of power and compression, no codes, starts & runs fine except for the following:

1. Poor gas mileage.
2. Slight pinging (only at 1/8 throttle opening).
3. Spark plug insulators on new plugs are (bleached) WHITE.

The engine is NOT overheating. I did a complete tune up, checked the EGR and it is working fine, replaced all the vacuum lines, and checked the ignition timing. All good. Still pings. I'm stumped. :-(
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Saturday, July 21st, 2007 AT 5:59 AM

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Tiny
RASMATAZ
  • MEMBER
Other causes of detonation include excessive compression, elevated engine operating temperature, preignition, overadvanced ignition timing (spark knock), lean fuel mixture, spark plugs that have too hot a heat range for the application, low octane fuel.
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Saturday, July 21st, 2007 AT 4:42 PM
Tiny
TIMOTHY1027
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Other causes of detonation include excessive compression, elevated engine operating temperature, preignition, overadvanced ignition timing (spark knock), lean fuel mixture, spark plugs that have too hot a heat range for the application, low octane fuel, [/quote:fd6e16af2b]
The compression range is (215 to 226 psi) on all 4 clylinders (within Toyota specs), the engine operates at normal temps, the ignition timing is 10 degreess BTDC (as/Toyota specs), the spark plugs are correct NGK (OEM specified), I use regular fuel (correct / Owner's Manual).
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Saturday, July 21st, 2007 AT 6:54 PM
Tiny
RASMATAZ
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Since the EGR checks out-if it has a knock sensor check it-the computer might not be seeing it and not retarding the timing as required

FYI
My Mitchell book says about compression:

Compression: 191psi
Minimum Comp. 142psi
Max. Variation between cylinders 14psi
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Saturday, July 21st, 2007 AT 8:12 PM
Tiny
TIMOTHY1027
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The engine does not have a knock sensor.
The factory service manual says about compression: "STD.191 psi) or more."
I checked the valve timiing - Dead Nuts.
I replaced the fuel filter (in case of clog).
Still slight ping. I am STILL stumped.
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Wednesday, July 25th, 2007 AT 5:46 PM
Tiny
RASMATAZ
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The engine does not have a knock sensor.
The factory service manual says about compression: "STD.191 psi) or more."
I checked the valve timiing - Dead Nuts.
I replaced the fuel filter (in case of clog).
Still slight ping. I am STILL stumped.[/Quote:4cc998b551]

Could be lean mixture-lets try going into the mind of the Computer by checking its parameters on the injector pulses, Coolant Temperature/Oxygen sensors with a Scan Tool.

When you check the ignition timing did you jump the diagnostic connector?
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Wednesday, July 25th, 2007 AT 7:48 PM

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