Keith Browning Posted October 9, 2015 Share Posted October 9, 2015 It seems like all of a sudden this year I am seeing a lot of injector circuit codes that I narrow down to the connections at the injectors under the valve covers. I noticed on two that the connector, while fully seated, did not seem locked in. I mean, I used the release tool with no effort or feel at all. I think one even came off by hand and just would not lock. In these instances I have been replacing the injector as well as the harness.Anyone else? I did however have one injector that went "open" when it cot warmed up. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted October 9, 2015 Share Posted October 9, 2015 I see a lot of those harnesses crapped out especially when an injector has been disconnected at one time or another. The tool is a life saver however it can break the lock mechanism on the connector......the best way to disconnect is to use the tool in conjunction with a pick to push down on the lock in the center of the connector. Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted October 10, 2015 Share Posted October 10, 2015 I noticed that too. Don't force the tool too hard and I use a small pocket screwdriver to help release the connector. Any time I'm under the valve covers I try and quote harnesses. Quote Link to comment Share on other sites More sharing options...
8WA Sman Posted October 10, 2015 Share Posted October 10, 2015 I have not seen any broken connector locks but I have seen poor terminal tension problems. I thought the newer UVCH that I have put on have the style of release that I just depress with my finger. The way I test 6.4L injectors that I think failed electronically is by disconnecting the PCM connector. I put my DVOM between the two circuits on injector in question. I have found that with my DVOM on the ohms setting a good injector will pulse the meter between around .7 k and OL, almost like a heartbeat. Harness problem that I have seen I usually get a reading in the M ohms or OL. Injector problem have been under 500 ohms with no pulse. After I remove the valve cover I recheck my readings @ the injector. I tried to attach a video of me testing an injector but I think the format is wrong. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 11, 2015 Author Share Posted October 11, 2015 The way I test 6.4L injectors that I think failed electronically is by disconnecting the PCM connector. I put my DVOM between the two circuits on injector in question. I have found that with my DVOM on the ohms setting a good injector will pulse the meter between around .7 k and OL, almost like a heartbeat. Harness problem that I have seen I usually get a reading in the M ohms or OL. Injector problem have been under 500 ohms with no pulse. After I remove the valve cover I recheck my readings @ the injector.I am not sure what it is you are doing there but a good 6.4L injector will measure between 150 kOhm - 250 kOhm and I have never seen any pulsing with my meter. The only erratic readings I see are poor connections that vary during a wiggle test. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted October 11, 2015 Share Posted October 11, 2015 The way I test a 6.4 injector is: First, remove the valve cover. Second, grab a 48 oz ball peen hammer. Third, whack the everlovin' shit out of the top of the injector, if it breaks then it's bad, if it doesn't break then it's good to go. I'm in a weird mood this A.M. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 11, 2015 Author Share Posted October 11, 2015 WTF was in your coffee today? :hammer: Quote Link to comment Share on other sites More sharing options...
JoeR Posted October 11, 2015 Share Posted October 11, 2015 The way I test a 6.4 injector is: First, remove the valve cover. Second, grab a 48 oz ball peen hammer. Third, whack the everlovin' shit out of the top of the injector, if it breaks then it's bad, if it doesn't break then it's good to go. I'm in a weird mood this A.M. you must have learned this procedure at a GM dealer, tap testing PCMs in the 90s. :-) Joe Quote Link to comment Share on other sites More sharing options...
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