Long story short, My 04 LB7 (117,000) was smoking. Assumed it was sticking injector like last year. Smoke was darker though, but I talked myself into it being a stuck injector. Anyway, diesel was smoking really bad and when it started knocking, really bad, coming up to freeway speed, I took it to GM then next morning. They found that the Fuel Pressure Regulator failed (they found this by code and pressure test as a result from the code)and was dumping high pressure fuel into the cylinders (excess smoke) and due to excess fuel, causing the knocking. $500 and new regulator later, it still smoked. They then found a low compression on #7. End result after head removal = Busted exhaust valve, valve seating surface, piston jagged and missing pieces, cylinder wall scored. Best option now is new engine ($12.5k).
My biggest question is this: With all the computer monitoring on these engines now, shouldn't the pressure regulator failure have resulted in a "Service Engine" light?
I have never done anything extra to this diesel. No power chip, no after market intake or exhaust. And the service guy said this failure is what is seen on failures of trucks with power chips that cause EGT to go way too high and cause damage. With all the stupid codes that bring in engine lights, why isn't a failure of a REGULATOR a trouble light/code?:help
My biggest question is this: With all the computer monitoring on these engines now, shouldn't the pressure regulator failure have resulted in a "Service Engine" light?
I have never done anything extra to this diesel. No power chip, no after market intake or exhaust. And the service guy said this failure is what is seen on failures of trucks with power chips that cause EGT to go way too high and cause damage. With all the stupid codes that bring in engine lights, why isn't a failure of a REGULATOR a trouble light/code?:help