Question about 2003 Nissan Maxima

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Engine lite, detonation problem, rattle sometime when accelation

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O2 sensors and/or ignition coil(s). they prolly burnt out your catalytic converter and thats why you hear rattles. same problem but im buyin a new one so what do i care - let the dealer deal with it. 02 sensors are like 80-1xx bucks and coils are like 50 a pop. not too expensive just look around and get a handy friend to replace it. shops will ******** you and charge ungodly amounts. good luck!

Posted on Apr 23, 2009

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89 Chevy s10 blazer 4.3 I've tried 93 octane gas vavles rattle under a load


it is not the valves that are rattling under load but detonation in the combustion chambers from incorrect air/fuel mixture and ignition timing
The rattle is the pistons being slapped against the cylinder wall and the rings taking a pounding in the ring grooves
detonation is the untimed spontaneous combustion of a weak air/fuel mixture ( diesel action) before the spark ignites the mixture
It can melt the top out of the piston because it sends the combustion temperature up to 200 degrees c higher than normal
Evidence of detonation in an engine can be seen in the crown of the piston as small pit marks as if being pounded by ball bearings
How to fix --- drop the advance timing of the ignition back to 12 btdc ( standard on chev motors) or better back to 10 degrees btdc
increase the main jet sizes in the carbys or make sure that the power valves are operational in the carbies
The correct air/fuel mixture is 15:1 and that should be maintained at all times unless under acceleration when it can go up to 17 or 18:1 but if it drops below 14:1 when the throttle is wide open and the fuel is not increased to compensate ( accelerator pump or power valve ) then detonation will occur

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PLEASE RATE THIS REPLY FOR ACCURACY

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1 Answer

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