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Ok, so I got the engine back together and started the engine. The engine turned over instantly. ran for a good 30 seconds to a minute.. before suddenly sounding like an exhaust leak happened. It ran rough. I quickly turned it off. Ever since then, sometimes it would start, but would run rough. Otherwise, just cranks, stumbles, acts like it wants fuel. I'm wondering is this could be due to bad timing. I won't rule it out since it was working prior to be taking it apart.. but as stated.. it was running well! * I did reuse the Actuator Valve Bolt... Could reusing this bolt cause this issue? * The ONLY code I had is the P00C6 code for Low Fuel Rail Pressure. * Research says this code is related to that damn bolt. (But primarily points towards the High Pressure Fuel Pump.) *Research says that High Fuel Pressure Pump is located on top of the lower intake manifold, below the upper intake manifold. I'm really like to know how to verify absolutely 100% that that's the culprit.
Replaced Engine, will crank, won't start
Minotaur posted a topic in 2000-2014 Silverado & Sierra HDI have a 2005 Sierra 2500HD, 6.0,4L80E, 4X4. The bottom end of the motor was making alot of noise after 165,000 miles. I decided to replace the motor, rebuild the transmission and transfer case. Got it all out, and all the new stuff put in. Went well for the most part. Replaced almost all the sensors, knock, oil level, crank,oil temp, engine temp,cam, etc. used genuine gm parts. Even ordered a new gm intake. Problem: She cranks, but I have no spark. Lights and buzzers inside work, everything seems to work, no issues. No security light on. Double checked grounds. (possible I have the wrong location??), checked all the fuses, Brand new battery. I have fuel pressure, going to put a gauge on this morning to see how much. (not that it will help with no spark.) Any Ideas? I'm at my wits end. (tried kicking the tires, didn't help)