LMM, full build, 16.5:1 fingers, carrillos, LML crank, Danville 68stg2r, dual fuelers.
I recently (few weeks ago)started getting intermittent smoking, mainly at idle. Thought it was probably time for injectors--turns out they were terrible. Replaced my 40 overs with new S&S 100s. While the shop had the truck, they found a hole in the hot side IC pipe that has apparently been there since the truck was built. Most boost I'd ever seen was around 32ish psi... little did I know I should have been seeing 40-45, according to Danville.
I told the shop who installed the injectors that I was getting some smoking that would range from absolutely no smoke, to a whispy white haze, to heavy whitish at idle. They said that it was likely a PCV issue caused by the reroute having only -4AN fittings, Tee'd together into another -4AN line, down to a fitting in the exhaust. They said the drastically undersized PCV was likely the cause of the smoke, which would likely be exacerbated by the increased boost from the 1/2" hole in the IC tubing being closed up.
I disconnected the lower fitting from the exhaust, and the heavy smoke is completely gone. It hasn't happened again since that. However, I still get the whispy white smoke at idle, when the truck is up to temp, in gear. When I pull up to a stop sign, I can look back in the mirror, and as I hear the turbo vanes shift (I'm assuming that's what causes the pitch of the exhaust to drop a few seconds after stopping, in gear, foot on brake) and then I can watch the smoke start. It's whispy, but it's much more than just a light haze. Sitting at an intersection when the wind is right it looks like somebody lit a small paper fire nearby.
It doesn't happen when the truck is cold. No smoke at all. I don't think I'm losing coolant, been monitoring for a couple days now after it was low--fairly certain it was low from not refilling after disconnecting the upper hose at the shop, but I'm continuing to monitor. No bubbles in the coolant tank when hot, running, with cap off. I'm not making oil, nor do I seem to be losing an inordinate amount. Iv'e got several leaks on the truck, and after 5,000 miles I've had to add a couple quarts--nothing that has increased recently.
My gut feeling is it's a turbo issue, after having been working like crazy to build boost for the last 35k miles since the build, with a big ass boost leak. When the vanes do their thing at idle, I think it's pushing a little bit of oil or coolant into the exhaust, causing the smoke. I'm still runnign the -4 fittings on the PCVs, going to swap them out tomorrow to the biggest brass nipple i can find with the right right NPT threads. While I'm doing that I'm going to pull the turbo elbow off and check whatever I can on the cartridge rotation and endplay. I'm taking the truck back to the shop on Friday to get a compression test done.
I'm trying to approach it systematically, hoping to pinpoint what's going on and replace/rebuild whatever is the culprit. What say y'all? Head gaskets? Turbo seals? PCV? Anything else I should check while I'm in there swapping out the -4AN fittings or the turbo cartridge?
I recently (few weeks ago)started getting intermittent smoking, mainly at idle. Thought it was probably time for injectors--turns out they were terrible. Replaced my 40 overs with new S&S 100s. While the shop had the truck, they found a hole in the hot side IC pipe that has apparently been there since the truck was built. Most boost I'd ever seen was around 32ish psi... little did I know I should have been seeing 40-45, according to Danville.
I told the shop who installed the injectors that I was getting some smoking that would range from absolutely no smoke, to a whispy white haze, to heavy whitish at idle. They said that it was likely a PCV issue caused by the reroute having only -4AN fittings, Tee'd together into another -4AN line, down to a fitting in the exhaust. They said the drastically undersized PCV was likely the cause of the smoke, which would likely be exacerbated by the increased boost from the 1/2" hole in the IC tubing being closed up.
I disconnected the lower fitting from the exhaust, and the heavy smoke is completely gone. It hasn't happened again since that. However, I still get the whispy white smoke at idle, when the truck is up to temp, in gear. When I pull up to a stop sign, I can look back in the mirror, and as I hear the turbo vanes shift (I'm assuming that's what causes the pitch of the exhaust to drop a few seconds after stopping, in gear, foot on brake) and then I can watch the smoke start. It's whispy, but it's much more than just a light haze. Sitting at an intersection when the wind is right it looks like somebody lit a small paper fire nearby.
It doesn't happen when the truck is cold. No smoke at all. I don't think I'm losing coolant, been monitoring for a couple days now after it was low--fairly certain it was low from not refilling after disconnecting the upper hose at the shop, but I'm continuing to monitor. No bubbles in the coolant tank when hot, running, with cap off. I'm not making oil, nor do I seem to be losing an inordinate amount. Iv'e got several leaks on the truck, and after 5,000 miles I've had to add a couple quarts--nothing that has increased recently.
My gut feeling is it's a turbo issue, after having been working like crazy to build boost for the last 35k miles since the build, with a big ass boost leak. When the vanes do their thing at idle, I think it's pushing a little bit of oil or coolant into the exhaust, causing the smoke. I'm still runnign the -4 fittings on the PCVs, going to swap them out tomorrow to the biggest brass nipple i can find with the right right NPT threads. While I'm doing that I'm going to pull the turbo elbow off and check whatever I can on the cartridge rotation and endplay. I'm taking the truck back to the shop on Friday to get a compression test done.
I'm trying to approach it systematically, hoping to pinpoint what's going on and replace/rebuild whatever is the culprit. What say y'all? Head gaskets? Turbo seals? PCV? Anything else I should check while I'm in there swapping out the -4AN fittings or the turbo cartridge?
