Pinging despite correct plugs and timing

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Jan 25, 2018

glweek

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Pinging despite correct plugs and timing

I have a 1997 HX with 180k on it and am getting a ping starting around 2100rpm with even the slightest load. The spark plugs are NGK ZFRF4-11 with an OEM distributer cap and NGK wires all replaced about 10k ago. Timing is set to 12* as indicated in my Haynes manual. The Timing was checked with the jumper installed causing the check engine light to stay on, idle at 670ish checked with a gun with perfect red mark indicated as well as OBD2 reader also showing exactly 12.0* between 667-677rpm.

Its been happening for a while, but not getting any worse. I also have possible piston slap, first start on cold mornings till the motor warms a little. I have but haven't gotten around to installing a new fuel filter and have a pressure checker but have not checked compression yet. EGR valve was cleaned about 10k ago as well. Been raining for a while and no garage so can't check the valves at the moment.

What else do i check?

Last edited by glweek; Jan 25, 2018 at 01:17 AM.

Jan 25, 2018

Wankenstein

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Re: Pinging despite correct plugs and timing

First..try running 93 octane for the next couple fill-ups.
Read: http://articles.chicagotribune.com/1...e-premium-fuel

This read may help: http://articles.orlandosentinel.com/...as-premium-gas

Last edited by Wankenstein; Jan 25, 2018 at 07:42 AM.

Jan 25, 2018

ezone

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Re: Pinging despite correct plugs and timing

Quote:

I have a 1997 HX with 180k on it and am getting a ping starting around 2100rpm with even the slightest load

Does it rattle at maximum load too?
Got a recording of it?

I think with high mileage those engines would rattle main bearings at light load conditions, maybe that's what you hear?

Feb 28, 2018

D17VTECPOWER

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Re: Pinging despite correct plugs and timing

How do you know that it’s the engine pinging? The catalytic converter could be broken apart inside and rattling. Tap on it and see if it rattles. You could also have a loose heat shield.