Question about Chevrolet Tahoe
That code is a random misfire code. You want to check the fuel regulator first to see if it is leaking. This is a common problem with this engine and will cause all the symtoms you have and maybe more at times.On the driver side of the engine in the intake area about half way you will see a little round metal thing on the fuel rail with a vacume line going to it.Pull the vacume line off and see if there is gas there. There should be NO wetness there at all. If there is you will need to replace that and that will solve your problem. If not let me know and we will go from there. Hope this helps.....Thanks...Dan
Posted on Jul 21, 2008
98 monta carlo po300 canged coil packs plugs wires still have code
Posted on Aug 25, 2010
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Ensure all connections are clean and properly tightened.
Mass air flow sensor
A mass air flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition. Try operating the vehicle within the Failure Records conditions with the MAF sensor disconnected. If the lean or misfiring condition is not present with the MAF sensor disconnected, replace the Mass Airflow Sensor Replacement .
Damaged accessory drive belt or driven accessory
A damaged serpentine belt or belt driven accessory can cause engine load variations sufficient to set a misfire DTC.
Air induction system
Vacuum leaks that cause intake air to bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or malfunctioning crankcase ventilation valve, or for vacuum leaks at the throttle body, exhaust gas recirculation (EGR) valve, and intake manifold mounting surfaces.
Perform a fuel system pressure test. A malfunctioning fuel pump, a plugged filter, or a malfunctioning fuel system pressure regulator will contribute to a lean condition. Refer to Fuel System Diagnosis .
Refer to Fuel Injector Solenoid Coil Test .
Water contamination in the fuel system can cause a single cylinder to misfire as well as cause a random misfire, refer to Alcohol/Contaminants-in-Fuel Diagnosis .
Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.
Excessive Open Loop operation caused by extended idling or short trip driving may leave deposits on the heated oxygen sensors. The deposits cause oxygen sensors to respond slowly to exhaust oxygen content, affecting fuel control and causing a misfire to be indicated at idle. This condition is not permanent. To determine if this condition is causing the DTC P0300 to set, review the Freeze Frame/Failure Records for DTC P0300. If the DTC P0300 occurs at high engine speeds, the condition described above did not cause the DTC to set. If the DTC P0300 occurs at idle or very low engine speeds and at engine coolant temperatures below 80?°C (176?°F), the condition described above is very likely the cause of the DTC to set. The deposits on the heated oxygen sensors can be eliminated by operating the vehicle fully warm at mass air flows above 15 g/s.
Jun 23, 2016 | Buick Cars & Trucks
May 25, 2015 | Cars & Trucks
May 14, 2015 | 2005 Cadillac STS
Jan 29, 2015 | 2003 Nissan Murano
Aug 13, 2012 | Tata Indigo Cars & Trucks
Sep 22, 2011 | 2003 GMC Envoy
Jun 10, 2010 | 2001 Audi A4
Jul 15, 2009 | Hyundai Motor 2004 Sonata
632 people viewed this question
Usually answered in minutes!