Question about 2007 Mazda B2300

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Pre-ignition I have a unique situation, my truck has the classic pre-ignition symptoms, as I go up a small hill I get the pinging sound from the engine. I have replaced, spark plugs, Oxygen sensor, spark plug cables, cleaned valves/pistons (sea foam)? nothing seems to help. Then I decided to turn my attention to the EGR Valve, it seemed to work correctly. The conclusion I came to was that there was a sensor that was not working correctly and fooling the computer thinking everything is OK, when in fact the engine timing should be retarted. This is what I did to trick the computer to cause engine retart which stops the pinging, I removed the vacuum hose from the EGR valve causing it to stay closed, this is sensed by the oxygen sensor that sends a signal to computer saying EGR fault, which then retarts the engine due to fault. Can you help me with what other sensors are fed back into computer to give you retarting of the timing. There is no 'knock' sensor in this model.

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Remove the black octane shorting (one time timing ****** adjustment) bar located near the ignition module ( the connector the bar goes into looks like a fuel injector connector), this should stop the ping, make sure the right jumper is removed, if you pull the wrong one the truck will lack power, if you get the right one the ping will stop and you will feel no change, U may loose a little MPG. If you can't locate it the dealer will do it for little or no charge, just tell them you want the octane adjust short5ing bar removed, did many of them on trucks like yours, the 2300 has a pinging issue, they all do, Mazda and the Ford Ranger.

Posted on Nov 26, 2008

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