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Causes of Spark Knock?
Posted 17 August 2003 - 12:34 PM
I've been experiencing spark knock almost all of the time while driving my car lately. The car has no excessive load in it, the temp outside has been in the 80's, good (91 oct) or bad (85 oct) gas doesn't affect it. I've noticed it before, but only on steep grades or loaded down with cargo. Any ideas:confused: ? Thanks,
Posted 17 August 2003 - 12:46 PM
Posted 17 August 2003 - 04:54 PM
Knock is too much advance on the ignition timing, or an overheating engine.
Carbon build-up in the cylinders can also cause pinging.
Other things can sound like knock or ping also. For instance, a small pinhole exhaust leak, mis-adjusted valves, or loose connecting rods.
Posted 17 August 2003 - 06:33 PM
I replaced cap and rotor, spark plugs, and wires (spent $20 on wires, $10 on plugs, and $12 on cap and rotor) replaced exhaust gaskets, cleaned the EGR valve, and replaced the PCV valve. it's quieter, the muffler sounds more, and way better performance/gas mileage.
It might be too much to do, but it might be the best bet. replace EVERYTHING that might do it outside of internal engine work.
Posted 17 August 2003 - 07:21 PM
Posted 17 August 2003 - 09:24 PM
are you sure this isn't made up or something?
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