new injectors, running rough, trasmission slipping

[94PSD]

friend of mine just replaced his injectors and glow plugs on his 04 6.0 4x4. also installed the air dog 2 pump system. he upgraded to 185cc injectors. we got the truck started after a couple cranks. on first start up it seemed to run great. after letting it warm up at idle we took it for a quick spin around the block. drove it normally, no hard accelerations. after about 5 min it started to idle rough, but when accelerated runs fine. a little after the rough idle the transmission started slipping in 2nd gear but only for about 2-3 seconds. it would only slip every now and then, not every time it went into 2nd. also on take off it would start off in 3rd or 4th gear, but only did this about 2 times and sometimes it drove and shifted like it normally should. before injectors were replaced the truck sat for for about 5 months because i believe 3 injectors were bad. before it was parked transmission shifted fine no problems. he's saying it seems like its running just like it did when the old injectors were in. is it supposed to idle rough after new injectors, if so for how long? possibly air in the fuel lines? what could be causing these symptoms? as far as the transmission problem we have no idea why its doing that. any help would be much appreciated. thanks

[07powerstrokebosss]

are you sure its the tranny and not just something fuelwise? my buddys got a 08 d max and thought his tranny was slipping but it was actually a fuel issue it needed more fuel....

[94PSD]

to us it seems like its the transmission and more of a slip than a fuel issue. sometimes it shifts weird and sometimes it'll start off in 3rd or 4th from dead stop. but you could be right, we could try to turn the pump up and see if that changes anything. also he said this morning he went out and started it and it ran great until it warmed up then it started running rough again.

[Chango]

its an injector problem of some kind. The injectors are oil driven, so when the injectors are not firing properly it gives off what appears to be tranny problems. So when you say trans slipping, is it taking longer to shift, like its holding a gear too long or is he stepping on it and going nowhere.

Sorry Im of no help solving the problem, just wanted to mention that it could be injector related. Good luck

[f250ghost]

First off where did he get the injectors? Secondly, if the injecgtors arent working correctly it could confuse the pcm and cause teh tranny to act funny. when i had my injectors issues sometimes the truck woudl go into limp mode because the tranny was gettin confused.

Scan for some injector codes and go from there. Willin to bet you have a bd injector.

[94PSD]

we ended up figuring out that the new injectors are single shot. So he's going to get it programed somtime this week and it should fix everything.

[94PSD]

So he got it programed and now the motor runs fine but the tranny is still not working right. Before we did the injectors the tranny was fine. Could we have messed up the tranny on the first test drive because the pcm was confused with the single shots instead of split shot?

[f250ghost]

Keep in mind the tranny has to go through a re-learning stage since it was re-flashed. You can probably find the procedure on here somewhere. But don't fret...its likely just in the re-learning stage.

[lhsnbsaoa]

Did you upgrade the rest of the fuel system? Like a fass fuel pump? I know most people do that when they do injectors. Just sayin.

[94PSD]

Originally Posted by lhsnbsaoa

Did you upgrade the rest of the fuel system? Like a fass fuel pump? I know most people do that when they do injectors. Just sayin.

Yes, we installed an air dog 2 pump and bigger lines