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Join Date: Oct 2011
Location: Pasadena, CA
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Since it passed the buzz test I am going to assume that the coil on top of the injector #7 and the wiring to it are good. The PCM is reporting that when it gives the signal (or more when it removes the signal) to cylinder 7 to stop firing there is no difference to the idle. Meaning the test is to see how much more the other cylinders have to work when the PCM kills one of the cylinders. The more the other cylinders have to make up for the dead cylinder the more that dead cylinder was contributing to the overall performance of the truck. If the cylinder was dead the whole time (or so weak that at idle it really wasn't doing anything) the PCM will set a code for the particular cylinder that when killed showed no change in idle quality.
What this all means, since it passed the buzz test the wiring _should_ be fine. The injector itself may be weak or dirty, not just dead. Pull the right valve cover and watch the injector while the motor is running. Is there oil coming from the injector exhaust port (injector opening issue)? Is there oil coming up from base of the injector at the head (injector o-ring issue)? Pull the connector off the injector, did the idle change (electrical issue)? Pulling your own injectors is not hard just messy and time consuming. Does the truck drive fine (dirty nozzle issue)?
-'97 Mini Monster
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank
-'15 F350 6.7L DRW 4x4
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Last edited by BigFuel; 05-01-2013 at 08:48 AM.