ryan.h Posted January 31, 2007 Report Share Posted January 31, 2007 I'd like to ohm out an injector without pulling the plenum. Where would I look? Quote Link to comment Share on other sites More sharing options...
94CutlassXtreme Posted February 9, 2007 Report Share Posted February 9, 2007 There really isnt any way to do it without pulling the plenum. I'm pretty sure you can only backprobe one injector with the plenum on, and it's the one at the front bank, drivers side, behind where the FPR sits. Pulling the plenum isnt that bad. All you have to do is remove the throttle cables, serp belt, 2 alternator brackets that share bolts with the plenum, some vac lines, the MAP, the EGR, and the ICM and coils. Sounds like alot, but its not that bad. I didnt disconnect the EGR pipe when I tested mine, I just swung the plenum up and propped it up with a screwdriver. After that, that hardest part is unplugging the injectors, some are just a bitch to get to with your fingers. All you need for reinstall are some new plenum gaskets and possibly a new EGR pipe gasket. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted February 9, 2007 Report Share Posted February 9, 2007 YOU CAN BACKPROBE! each injector has a separate hot wire and a common ground. the injector harness plugs into the engine harness in the space between the alternator and the coil packs. the problem is figuring out which wire is which to do the test. Quote Link to comment Share on other sites More sharing options...
ryan.h Posted February 16, 2007 Author Report Share Posted February 16, 2007 YOU CAN BACKPROBE! each injector has a separate hot wire and a common ground. the injector harness plugs into the engine harness in the space between the alternator and the coil packs. the problem is figuring out which wire is which to do the test. Other way around. Each injector has a separate ground wire and a common +12. Since on my car the PCM is just so handily on the passenger side under the hood... I was able to check the resistance of each injector from the PCM connector to +12 (battery disconnected!! and ignition key "on") I also was able to short each to ground and listen for the click. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted February 16, 2007 Report Share Posted February 16, 2007 YOU CAN BACKPROBE! each injector has a separate hot wire and a common ground. the injector harness plugs into the engine harness in the space between the alternator and the coil packs. the problem is figuring out which wire is which to do the test. Other way around. Each injector has a separate ground wire and a common +12. Since on my car the PCM is just so handily on the passenger side under the hood... I was able to check the resistance of each injector from the PCM connector to +12 (battery disconnected!! and ignition key "on") I also was able to short each to ground and listen for the click. OH. You're right! Quote Link to comment Share on other sites More sharing options...
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