For about a month now I've been getting the p0200 open injector circuit and a misfire detected in cyl 7 codes. I've had is scanned and checked several times, of course not by the dealership because as soon as they saw the Radix they shut the hood and said they couldn't work on it. Idiots. Not all dealerships, just Preston Hood Chevrolet in Fort Walton Beach, FL, they suck. Anyway. I had the fuel line pressure checked by manually firing each injector with a scanner and #7 didn't fire. So I replaced the injector. Didn't fix it. Replaced all spark plugs and wires just because, and that didn’t help either. I have a guy that wants to do an injector balance test, not sure what that will accomplish? I checked the injector clip wires 12V on one side and ground on the other. What am I missing? I guess I will start at the PCM and check wires all the way to the injector tomorrow with an ohmmeter. Anybody got other ideas? Coil pack issue? Can a pin in the PCM just shit out? During the fuel pressure test the #7 injector didn't shoot any fuel at all so I think I have a bad wire or the PCM isn't commanding the injector to fire, Help is always appreciated. Oh yea, I checked the wires in the clip they are in firm and the injector is new so I should have a good connection on that end.

Today I found that all the wiring has correct voltage and that it seems as if #1 is not firing either! While its running it idles like crap, I disconnect 7 and no change, then I discinnected #1 and no change either. All the others cyl. have the expected response when disconnected. So I guess 7 and 1 are not firing at all right now??? What could cause injectors to quit firing? 2 on that bank (#3 & 5) are good and 2 (#1 & 7) are not, the passenger side bank is fine. Fuse is good, voltage is good, Ground is good, computer pins are good. Compression test good, I'm lost. :confused:

injectors can overheat if they are overstressed and fail. Its too bad you dont have any scanning software. Are you shure its not the plugs arent firing, you could take on out ground it and leave it hooked up just to eliminate that.

so injectors are good and wiring is good? :confused: IS this the first time this has occured or are you just now able to scan it and noticed it? I Dont think this would have all that much to do with it, but you may want to do a compression test on those cylinders, at least I would. I try to rule out anything.

I did an injector balance test a few weeks ago and #7 didn't fire off, so I replaced the injector. It seemed to work OK for a day or so then misfired again. I have the flex fuel truck so my injectors are not the 24 #ers that most get mine has 38# injectors and I am running the stock 3.4 pulley on the radix so I wouldn't think the injectors are overworked but I don't have a program to check duty cycle on them. Your theory makes sense as to why #7 seven quit working right away again and then # 1 seems to have followed. I am going to do another balance test Monday and see if they are both not firing. Now I know why I have no power, I'm driving a 6 cylinder. :bang:
I'm also going to run an injector cleaner to make sure the rails and injectors don't have crap in them. Should I just buy some 42# injectors or the marine ones and get it over with? I would have to buy the wiring clips as well because mine are different due to the flex fuel system.

so injectors are good and wiring is good? :confused: IS this the first time this has occured or are you just now able to scan it and noticed it? I Dont think this would have all that much to do with it, but you may want to do a compression test on those cylinders, at least I would. I try to rule out anything.
I did a compression test today, all cylinders 185 to 190. While the truck is running I diconnect #7 and nothing changes leading me to believe the injector I just replaced a week ago has gone bad again. Then I disconnect #1 and the engine doesn't even notice. I haven't even gotten a code for #1 but I did get a p0300 random misfire today. It seems as if something is burning up my injectors but what could it be? A spike or drop in voltage? I have no other issues with the truck other than the rough idle and when the A/C is on it really has a hard time holding idle it feels as if the compressor kicks on every minute or so and if I'm at a red light or in park the rpm's drop to 300 or 400 and almost dies then jusmps back up, then the compressor kicks off and the rpm jump up a little then back to the rough idle. I was hoping this was all related to the misfire and the computer is having a hard time compensating for 2 dead cylinders and the A/C runnin. That GM pricing is starting to sound better and better, I could use the Radix sale money as a down payment... :disgust:

how did you check the injector clip for ground?

Had a mechanic with an ohm meter fooling with the wires. I'm not sure how he did it exactly, but he is working for free cause I paid him when he said it was the bad injector and I paid to replace it. So he has to get it right on his own dime, so I'm pretty sure he's not bs'ing me.

are these stock injectors that you are replacing the bad ones with?

Yes. I didnt upgrade with the radix because I already had 38# injectors stock. I have the "Z" Flex Fuel truck engine

So are you using the Westers tune or the Radix tune? I dont see how one injector goes bad and then you replace it and it goes bad again shortly thereafter. What differences do the flex fuel trucks have? Obviously larger injectors, but there must also be differences in tuning and other things. Maybe try swapping the #7 injector with one that works and see what happens.

Monday I will be doing a few more tests and maybe swapping injectors to see what happens. Either way at this point it seems I need 2 new injectors. I am using the Westers tune but Lyndon at Westers was aware of the flex fuel and tuned for it.

maybe this will help
http://www.rankmyride.com/data//9/8/13808//.large/file0001.jpg
http://www.rankmyride.com/data//9/8/13808//.large/file0005.jpg
http://www.rankmyride.com/data//9/8/13808//.large/file0002.jpg
http://www.rankmyride.com/data//9/8/13808//.large/file0004.jpg

After trying hours of crap, we went back to basics. During the injector balance test I lost #3 injector. :bang: We pulled the 1,3,5 injector clips off and squeezed the contacts together real tight and put them back on the #1,3, &7 injectors and re did the balance test. All 3 fired!! :eek2: The whole time it appears the clips were just not making good contact with the injector. Why they all did it at once I have no idea. It did misfire again on my way home but when I pulled in the driveway and got my screwdrivers ready to squeeze clip it wouldn't misfire anymore. Took it a quick road trip and still fine. I have a buddy coming over to read the code with his scanner and see if its cylinder specific, guess I'll be tightening them all down and see what happens. Now I just have to figure out why my A/C compressor kicks on every 60 seconds and the idle drops to 300rpm :(