neo
02-16-2010, 10:16
Hi folks, I recently built a 6.2 about the best I could afford. New pistons, IP ballanced, B/ped, custom girdle, heads redone, timing gears, etc. stuck it against a build 700R4 and Jeep NP208 and crammed it under the hood of my 89 Wagoneer. Military take out engine was started with. Starts fine and sounds pretty good at idle. Here is the issue: When under load and warmed up, you can hear what I believe is one injector popping . It is consistent, again as far as I can determine, with the cam timing/IP timing. There is some white smoke at idle and under load. Sometimes you can (for a very short time after accelerating, here the single injector popping noise at idle, but it goes away quickly. All injectors ahve been bled by crakcing them and the power test indicated nothing, all seem to affect idle.
I placed a section of clear Tygon hose on the exit to the IP and there are very slight, tiny little bubbles in the line exiting the IP. I placed a section of the same hose ahead of the IP and it is clear as it can be. I notice that it (the IP will "burb" more air bubbles when I either acclerate the engine and let off quickly, or at idle hold the return line clsoed and then let it go. The bubbles under either condition are much larger than the normal bubbles.
So I think there is a bad injector, just not able to locate it yet. Is it possible air can come back up into the IP to be expelled from the IP through the return line from an injector line? Can the IP simply have an issue and allow air in? I know it is not coming in the IP from the line cause as mentioned it is clear as it could be. The stream coming out of the IP return is normally very tiny and you have to look to see it, but changes signifcantly when you hit the throttle or bog the engine by closing it up.
Anyone have any ideas? It is driving me nuts:mad:!! Thanks!
I placed a section of clear Tygon hose on the exit to the IP and there are very slight, tiny little bubbles in the line exiting the IP. I placed a section of the same hose ahead of the IP and it is clear as it can be. I notice that it (the IP will "burb" more air bubbles when I either acclerate the engine and let off quickly, or at idle hold the return line clsoed and then let it go. The bubbles under either condition are much larger than the normal bubbles.
So I think there is a bad injector, just not able to locate it yet. Is it possible air can come back up into the IP to be expelled from the IP through the return line from an injector line? Can the IP simply have an issue and allow air in? I know it is not coming in the IP from the line cause as mentioned it is clear as it could be. The stream coming out of the IP return is normally very tiny and you have to look to see it, but changes signifcantly when you hit the throttle or bog the engine by closing it up.
Anyone have any ideas? It is driving me nuts:mad:!! Thanks!