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Message: <blockquote data-quote="SlowRider" data-source="post: 1514231" data-attributes="member: 29436">I still have not checked the MAF sensor (can the engine run with a bad MAF?). Meanwhile I discovered that my radiator, water pump and timing chain cover were leaking from their respective gaskets and not holding pressure. So I replaced radiator, water pump and the gaskets. I am not sure if pockets of overheating can cause detonation/pinging. So far I have checked all the grounds, PCM for corrosion/ground, checked plugs/wires, replaced IAC, distributor cap, ignition coil, ICM, HB. I am running 14 degrees BTDC ignition time and with 87 gas it pings under load in any gear. With 93 gas it generally does not ping except when I floor the gas pedal in 5th. In conclusion the problem is not solved while with 93 the car is drivable. I don't think the problem is from ignition system (I am not sure if I should check the distributor pickup coil). Also, I will change the timing to 10d BTDC and see if the pinging changes with 87/93. I notice that the voltage needle shakes very slightly only while idling. I have checked the alternator and it is fine. Battery is practically new. I don't know if the shaky needle is related to pinging. I do smell unburnt gas while idling. Will leaky fuel injectors cause pinging? Any other thoughts/suggestions?I have bought a factory troubleshooting manual ($$$), but the sheer size of that thing is quite repulsive...</blockquote>