Chevy 6.0 misfire at idle

Mar 11, 2020 · Change idle to 790 RPM, studders and misfires occur at the same rate as 550 RPM. Change all idle settings to 800 RPM, drive like this for a week, aside from pulling hard on the brakes at a stop, truck runs so smooth. Replaced injector in #2, matched the new injector p/n to the one previously installed, installed new seals on the other 3. I've got a 2007 Silverado 2500HD 6.0 Vortec with a PO300 random misfire/rough idle issue. 150k miles on the truck. I've read most threads on the subject (much appreciation!), and will try some more solutions today. The truck runs rough at idle, though smoothes out as the rpm's rise. One time, it did completely misfire and limped back to my shop.Idle the engine. Turn all the accessories ON (i.e. lights, A/C, rear defogger). Set the Park Brake. Transmission in drive. Monitor all of the Misfire Cur. counters on the misfire data list (one counter per cylinder) using the scan tool. Manual Transmission. Install the scan tool. Idle the engine. The following TSBs of Chevrolet are related to DTC P1682. 2002 Chevrolet Trailblazer Electrical System TSB Details …; 2002 Chevrolet Trailblazer Engine and Engine Cooling TSB Details …

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6.0 - 170k Fairly Recent Fuel Pump, Spark Plugs, Oil Change, Cleaned TB and MAF sensor I just pulled exhaust manifolds and replaced the gaskets. I now have a bad misfire. Only at an idle/low rpms. No CEL, but i did get a p0300 from the computer. I can't figure this out for the life of me. I have about 50psi fuel pressure while running, 58 ...

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I have a 2011 Chevy 2500hd with 6.0. The truck has developed a misfire at idle and partially on the gas. I have replaced all the spark plugs, all 8 injectors, moved coil packs around, replaced MAF, MAP, b1s1 02 sensor (was getting codes for that sensor only), ECU, fresh gas and added cleaners, cl... Jun 26, 2018 · cold starts chevy k2500hd Hello, I am the original owner of my k2500 HD. I'm an auto body and frame tech, so I'm somewhat knowledgable mechanically, and maintain my own vehicles. Truck is as follows 6.0 engine, 4L80 e trans, 4.10 rr axle. Mods are a K&N fipk2 installed at 25,000 mi, throttle body spacer installed at 25,... B. Idle Time: Run engine (do not drive) for 2 1/2 minutes with the air conditioner on and rear defroster on. During this period the ECU will be running the Oxygen Sensor Heater self-test, Air Injection System Passive Air test, EVAP Purge "No Flow" test, Misfire Detection.

The following TSBs of Chevrolet are related to DTC P1682. 2002 Chevrolet Trailblazer Electrical System TSB Details …; 2002 Chevrolet Trailblazer Engine and Engine Cooling TSB Details … Mar 07, 2010 · Misfire, irratic low idle and stallout Alright so, my waterpump failed. I replaced the waterpump and through a broken optispark connector that had been taped on by the previous owner, water flooded the opti and it died.

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