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Truck has no rough starts or rough idle. On a tech2 the truck requested idle is 680 and it sticks around 680/681. ... Duramaxdiesels.com was founded in 2006 and created a site which houses some of the best known Duramax tech you can find. We strive to keep this the #1 forum for tech and information while continuing the push for new and exciting. Discussion Starter · #1 · Mar 23, 2014. Hi I Have a 06 Duramax and the code p0090 popped up so i replaced the Fuel pressure regulator and that didnt fix the problem, but while i was in there i seen the wiring harness for the fuel pressure regulator had a little cut in it so i replaced that hoping that would solver the problem but it didnt. I.
Search: Duramax Fuel Knock. Ultra Low Sulfur diesel is very dry and has 0 lubricating properties 0 points1 point2 points 3 years ago (3 children) Each refers to the same problem Hazing smoke at idle, excessive injector balance rates, knocking, missing, fuel in the crankcase and piston damage are all commonly experienced when an LB7 injector goes south LB7 (VIN "1") Engine was installed from.