What's causing my shudder

one2nine · Jul 2, 2013

Ok I've been having this on going surging issue. Truck runs fine when it's cold. Spools decent smoke is fairly low and runs pretty decent. I keep getting a reoccurring P1336 code camshaft/crankshaft sensor. I've tried two different tuners so I think I can rule tuning out of the equation as it does it with both companies. I had one of the return lines mixed up on the cooler so I then fixed that hoping it would solve my issues. Loaded up my new gearhead tune today and it seems to run good for about 10 minutes or so then I get a shudder/surge pretty much at all rpm's but more so at the lower end. Smoke seems to get a lot heavier as well. I'm running dual fuelers, 100%'s, and a regulated return for my fueling. Could it be a input/return pressure issue with the fuel getting hot? Would the P1336 code be causing this? Where exactly are the cam/crank sensors? I know they're on the front middle of the block but having trouble locating them.

Dzchey21 · Jul 2, 2013

unplug your fuel temp sensor i bet it goes away

pay close attention to when it does happen as well, im betting anything over 118 degrees fuel temp and it will shudder. Its a dual fueler thing but i have yet to figure out WTF causes it

one2nine · Jul 2, 2013

Temp was around 130 for fuel. I tried unplugging on Eric's tunes and it went into limp mode. Haven't tried it on Matt's yet

Dzchey21 · Jul 2, 2013

yeah it shouldnt do that, the worst that should happen is that the fan runs and lower speeds all the time, there is a way to shut that off too and just run it unhooked.

one2nine · Jul 2, 2013

Ill try it with Matt's tunes tomorrow and see what happens. I'm off tomorrow so I can mess with it

one2nine · Jul 3, 2013

Unplugged the fuel temp sensor and it solved the surging issues. Anyway of getting rid of the wrench now and keeping the fan from running making it a little sluggish?