trevdalocal
New member
Been enjoying the upgrades, 366SXE, 250/200s, SD efuel with RR. Pretty much out of nowhere, the truck has been smoking under moderate-heavy acceleration, even in a heavy tow tune. Hotter tunes give more smoke. The hot street tune that would previously give a few wisps before the turbo lit will now make a fat cloud that keeps billowing even with the turbo lit.
Before this problem occurred, the truck ran very clean. It would only smoke if you were a gear or two high and stomped on it (ZF5), and only until the turbo lit. Predictably, EGTs are also higher now. Not alarmingly high, but higher than when I first installed everything. At 65 cruising, I'm around 650-750, a minor hill will put it at 800-900. Bigger hills, I can reach 1000-1100. These are in heavy tow tune, unloaded, except a 50 gal transfer tank in the bed.
I checked for boost leaks and found the boots at the plenum Y weeping. I tightened those and all of the other intake clamps, except for the ones at the intercooler, in front of the radiator support, behind the grill. I did find very small leaks at both intake plenums (Beans billet), on the short side of the plenum closest to the inlet. Running my hands around the manifold, you can hear a very tiny wisp of air as your finger waves past it. Same place on both. I swear I cleaned the heads meticulously and ran a good bead of Ford gasket maker, but I guess that wasn't enough. How much boost leak is too much?
While trying to chase a rompy idle, the CPS was replaced with no real change. Don't know what happened, truck seems to idle okay when fully warmed up now. Instead, between 180-190F (according to ISSPRO temp gauge), idle "surges". Goes about 600 RPM and blips up to 650-700 RPM and settles back down, every 3-4 seconds, pretty rhythmically. Idles fine when cold after a few initial romps. ICP and IPR look fine under all driving conditions. Only thing I can think is UVCH and VC gasket, as those were not changed when I installed the injectors. Kicking my self now for not replacing them.
Passes a CCT according to Forscan, I'll try to make a video of a CCT running when I get a chance.
Thanks for the advice that's gotten me this far!
Before this problem occurred, the truck ran very clean. It would only smoke if you were a gear or two high and stomped on it (ZF5), and only until the turbo lit. Predictably, EGTs are also higher now. Not alarmingly high, but higher than when I first installed everything. At 65 cruising, I'm around 650-750, a minor hill will put it at 800-900. Bigger hills, I can reach 1000-1100. These are in heavy tow tune, unloaded, except a 50 gal transfer tank in the bed.
I checked for boost leaks and found the boots at the plenum Y weeping. I tightened those and all of the other intake clamps, except for the ones at the intercooler, in front of the radiator support, behind the grill. I did find very small leaks at both intake plenums (Beans billet), on the short side of the plenum closest to the inlet. Running my hands around the manifold, you can hear a very tiny wisp of air as your finger waves past it. Same place on both. I swear I cleaned the heads meticulously and ran a good bead of Ford gasket maker, but I guess that wasn't enough. How much boost leak is too much?
While trying to chase a rompy idle, the CPS was replaced with no real change. Don't know what happened, truck seems to idle okay when fully warmed up now. Instead, between 180-190F (according to ISSPRO temp gauge), idle "surges". Goes about 600 RPM and blips up to 650-700 RPM and settles back down, every 3-4 seconds, pretty rhythmically. Idles fine when cold after a few initial romps. ICP and IPR look fine under all driving conditions. Only thing I can think is UVCH and VC gasket, as those were not changed when I installed the injectors. Kicking my self now for not replacing them.
Passes a CCT according to Forscan, I'll try to make a video of a CCT running when I get a chance.
Thanks for the advice that's gotten me this far!
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