Question about 2003 Chevrolet Tahoe

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Check engine light coming on.

Getting codes for Random/Multiple cylinder misfire detection, Sys too lean(bank1&2) and Mass/Volume Air Flow Circuit Range/Perf. Replaced fuel filter last week(only had the syst too lean codes). Sometimes when you put into gear, the tahoe wants to take off. If on a steep incline, it would go without having to use the accelerator. Could the MAF sensor cause this?

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  • fastbackfrea Dec 22, 2008

    Took a look for vacuum leak but nothing jumped out at me.  I cleared the DTC codes that I had mentioned in 1st posting and as of yet they have not come back.  If it were the EGR valve,  I would assume that I would get a code for that?  Could the MAF cause it to run lean if it were bad or possibly cause the misfire detection?  

  • fastbackfrea Dec 22, 2008

    updated post

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  • 405 Answers

I wish I could be more specific, but a vacuum leak would cause all your conditions, any vacuum hose or motor or, loose or bad hose could cause this. Also, the egr valve not closing as it should. I hope this helps, if after you check these things out, message me back for a few more ideas, I doubt it would be the maf but anythinng is possible, generally the maf and oxygen sensors would throw a code if it were them.

Posted on Dec 22, 2008

  • David Johnson
    David Johnson Dec 22, 2008

    A vacuum leak can be very hard to detect. any vacuum operated part on your car could be the culpret. If you have a vacuum leak big enough to make your car throw these codes you should actually be a ble to hear it, places to listen or every where a vacumn hose connects to the engine and evertything they go to. Brake master cylinder, leaking vacuum motor IE egr heater valve etc..

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2002 buick Lasabrea custom service engine soon light code revi ew says multiple misfire detected


Multiple misfires can be caused by a few different things , intake manifold vacuum leaks , low fuel pressure , basic things like plug wires an spark plugs needing to be changed if hasn't been done already . How many miles on the vehicle ? If over 100,000 K timing chain an gear wear can also cause this . The powertrain control module (PCM) uses information from the ignition control (IC) module and the camshaft position (CMP) sensor in order to determine when an engine misfire is occurring. By monitoring the variations in the crankshaft rotation speed for each cylinder the PCM is able to detect individual misfire events. A misfire rate that is high enough can cause the three-way catalytic converter to overheat under certain conditions. The malfunction indicator lamp (MIL) will flash ON and OFF when the conditions for 3-way catalytic converter overheating are present.
If the misfire is random, check for the following conditions:
?€¢
System grounds


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.


?€¢
Fuel pressure


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 .


?€¢
Fuel injectors


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 .


?€¢
EGR system


Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.


?€¢
Extended idle


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.

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P0300 - Random, Multiple Cylinder Misfire Detected Fault Code Definition
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Symptoms
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  • Rough running, hesitation, and/or jerking when accelerating
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Common Problems That Trigger theP0300
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