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Re: mag mpi expert needed pls
the mercruiser scan tool has a built in injector testing circuit. you plug the harness into the injectoer and set the program for the " pulse " you want and hit the fire button and off it goes... options are single 400 msec pulse , 5 , 10, 20 or 50 400 msec pulses.
the dirty plugs were two each side... not on same anything... but then again, im not claiming that iknow for a fact that the 4 injectors that pulse simultaneously are on the same bank or for that matter , what the absolute truth of the effect that having a shorted injector did to ANY of the other circuitry. all i can say is that i know what a motor that has dropped one cylinder sounds like vs one that is just "flat" and that was the case here... it sounded like it had done exactly what the plugs suggest ...lost at least one cyl on each bank or more...
it just never dawned on me that it could have been a single injector... it was exactly when i had done full tanks so thinking horses not zebras i started looking at bad fuel...
as for the cleaning
i simply took the high pressure line from the pump and hose clamped a 3/8 line to it to a brass shut off that with another piece of 3/8 off the other end. the injector is such that either end will fit nicely into that hose and you hose clamp it tight. then just feed the pump with a separate line from a container with death injector cleaner and a little gas... turn the key on and off a few times to pressurize your rig and fire the injector into another container with the scan tool... takes only a couple mins each once you get organized. i flushed backwards to clean the screens a couple of 50 cycle pulses and then 10 -50 cycle pulses at pressure... the close the valve, disharge one last time to clear pressure from the hookup and do another one... easy and effective and building a bench rig would take about 15 mins.... but i did mine right in the engine bay.
my injectors are the first picture NOT the " A1 " ones and i may be wrong but i think they are delphi. did notice that they shoot a concentrated stream rather than a fan which surprised me as the fan pattern always worked a lot better on the race motors. i paid about 86 bucks from bam for them and felt that wasn't out of line. gotta say that of everyone ive dealt with since ive bought this boat, those guys are the absolute best for pricing and service. beat everyone by 10 or 20 % answer their phone and are polite, and ship instantly...
also pursuant to the knock down drag out fight we had here about extrude honeing and smooth finishes... i had to laugh when i took the plenum off and see the orange peel finish on the inside... i maintain that that is on purpose. not a cheap casting and i wouldn't think of changing it...
Last edited by stevesxm; 02-05-2006 at 04:27 PM.
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