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Spark knocking causes and what can be done to fix it?
My 1995 Toyota Camry has been spark knocking for a while. I took it in to the toyota dealer, and they adjusted the timing, cleaned the injectors, cleaned the carbon. Now they say it may be the timing belt needs adjusting. Several people said they felt it was not the belt. Do you have any suggestions or have any answers as to what else the cause could be. I don't have money to dig in my pockets for nothing. Thanks...Pat
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Comments
- fuel octane too low
- EGR system malfunction
- knock sensor (if equipped) malfunction
- PCM software not retarding ignition timing as required
- high engine operating temperature
- lean fuel mixture
- carbon deposits on piston crowns/combustion chambers
Cheapest fix might be higher octane fuel. If that doesn't work, the most likely culprit is engine timing and the devices that regulate it. Seems to me that an engine running hot enough to detonate would be fairly obvious.