Question about 2001 Acura MDX
#3 misfire-replace plug,coil,removed intake plenum,cleaned all passages,replaced all gaskets,adjusted valves,all injectors resistance readings are the same (.013/.014). removed injectors & flow tested,all o/k.no vacuum leaks, compression tested @ 220psi,never over heated,no blown head gasket,pulled coil,attached coil to plug,started engine to watch for spark-good spark,t belt @ 110k/present mileage 139500. removed new plug in #3- extreme lean electrode !!!!!!!-help ???????
Could be a fault in the #3 injector wiring, with the engine running back probe the wiring at the injector with a led trouble light it should glow at each pulse. a pulse can be felt by holding the injector if you have no light. compare with # I&2.
Posted on Nov 30, 2014
Testimonial: "not helpful,as I stated earlier,removed wire harness from injectors,(6) installed a noid light on each injector harness,cranked engine over,all injectors fire-noid light blinks on & off in sync as it should,no open circuits in harness,same with plugs & coils-all work. any other advise would be greatly appreciated. also note;can't reach injector harness with intake plenum installed. thanks for the try,Mike"
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Posted on Jan 02, 2017
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Nov 30, 2014 | Acura Cars & Trucks
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Fig. The location of the valve cover O-rings is shown here
Fig. The valve cover sealant application points
Fig. Location of the guide pins for the intake plenum-3.0L engine
Fig. Intake plenum-to-intake manifold mounting
Fig. The intake manifold bolt locations
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