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What's causing misfire at 1200-2100 when warm?
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<blockquote data-quote="hotcobra03" data-source="post: 12657998" data-attributes="member: 53096"><p>have you done a compression test? base engine is a cause..see 1st note</p><p><strong>H40 DTCs P1131, P1132, P1151, P1152, P2195, P2196, P2197 AND P2198: UPSTREAM HO2S NOT SWITCHING. </strong></p><p></p><ul> <li data-xf-list-type="ul"><strong>Note: </strong>It is necessary to address all Continuous Memory Ignition and Misfire DTCs, if received during Continuous Memory testing, before addressing any KOER HO2S DTCs. <br /> DTC/HO2S Reference List: <ul> <li data-xf-list-type="ul">HO2S-11 = DTCs P1131, P1132, P2195 and P2196</li> <li data-xf-list-type="ul">HO2S-21 = DTCs P1151, P1152, P2197 and P2198</li> </ul></li> <li data-xf-list-type="ul">Check intake air system for leaks, obstructions and damage.</li> <li data-xf-list-type="ul">Check air cleaner element, air cleaner housing for blockage.</li> <li data-xf-list-type="ul">Verify integrity of the PCV system.</li> <li data-xf-list-type="ul">Check for vacuum leaks.</li> </ul><p>Were any concerns found during inspection? </p><p>Yes No REPAIR as necessary. GO to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325012.htm~gen~ref.htm#pptDC25" target="_blank">DC25 </a>. </p><p><strong>H41 DTCs P0171, P0172, P0174 AND P0175: FUEL SYSTEM AT THE CORRECTED FUEL TRIM </strong></p><p></p><ul> <li data-xf-list-type="ul"><strong>Note: </strong>It is necessary to address all Continuous Memory Ignition and Misfire DTCs, if received during Continuous Memory testing, before addressing any Fuel Trim DTCs. <br /> Fuel System DTC Reference List: <ul> <li data-xf-list-type="ul">Bank 1 = DTCs P0171 (lean) and P0172 (rich)</li> <li data-xf-list-type="ul">Bank 2 = DTCs P0174 (lean) and P0175 (rich)</li> </ul></li> <li data-xf-list-type="ul">Check intake air system for leaks, obstructions and damage.</li> <li data-xf-list-type="ul">Check air cleaner element, air cleaner housing for blockage.</li> <li data-xf-list-type="ul">Verify integrity of the PCV system.</li> <li data-xf-list-type="ul">Check fuel delivery system and filter for restriction.</li> <li data-xf-list-type="ul">Check for vacuum leaks.</li> </ul><p>Were any concerns found during inspection? </p><p>Yes No REPAIR as necessary. COMPLETE KAM Reset. GO to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325012.htm~gen~ref.htm#pptDC25" target="_blank">DC25 </a>. </p><p> </p><p> </p><p><strong>DC25 DTC P0171, P0172, P0174, P0175, P1131, P1132, P1151, P1152, P1130, P1150, P2195, P2196, P2197, P2198 OR LEAN DRIVEABILITY CONCERNS: CHECK CONDITIONS RELATED TO MAF SENSOR </strong></p><p></p><ul> <li data-xf-list-type="ul"><strong>Note: </strong>Most weather service reports are a local barometric pressure that has been corrected to sea level. However, the BARO PID reports the actual barometric pressure for the altitude the vehicle is being diagnosed in. Local weather conditions (high or low pressure areas) will change the local barometric pressure by several inches of mercury [+/- 3 Hz. (+/- 1 in.Hg.)]. </li> <li data-xf-list-type="ul">Verify the MAF sensor is connected. If not, repair as necessary.</li> <li data-xf-list-type="ul">Key on, engine running.</li> <li data-xf-list-type="ul">Access the BARO, LONGFT1, LONGFT2 and MAF V PIDs on fully warmed-up engine.</li> <li data-xf-list-type="ul">Check that the BARO PID is approximately the same as the barometric pressure reading for the location, day and altitude the vehicle is being diagnosed at.<ul> <li data-xf-list-type="ul">BARO PID values in Keep Alive Memory require updating at high throttle openings. If vehicle is driven down from higher altitudes for diagnosing, complete three or four heavy accelerations at greater than half-throttle to allow BARO PID to update.</li> <li data-xf-list-type="ul">BARO PID must be within +/- 6 Hz. (+/- 2 in.Hg.) of the altitude value in Barometric Pressure Reference Chart (at the beginning of this pinpoint test).</li> <li data-xf-list-type="ul">Make BARO PID comparisons to Barometric Pressure Reference Chart or daily airport barometric pressure reports, if available.</li> </ul></li> <li data-xf-list-type="ul">Check that the LONGFT1 and LONGFT2 PIDS for all injector banks at idle is not more negative than -12%.</li> <li data-xf-list-type="ul">Check that the MAF V PID at idle and neutral is not greater than 30% of the normal MAF V listed in <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~leftside=V32s6l.htm&rightside=V32s6r.htm&market=us&lang=en~gen~2col.htm" target="_blank">Section 6 </a>, Reference Values (or not greater than 1.1 volts).</li> </ul><p>Are two of the above three checks OK? </p><p>Yes No <strong>For DTC P0171, P0172, P0174, P0175, P1131, P1132, P1151, P1152, P1130, P1150, P2195, P2196, P2197 or P2198 </strong>: GO to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325048.htm~gen~ref.htm#pptH42" target="_blank">H42 </a>(or GO to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325050.htm~gen~ref.htm#pptHA42" target="_blank">HA42 </a>for natural gas vehicles only). <strong>For driveability symptoms without DTCs </strong>: RETURN to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~leftside=V32s3l.htm&rightside=V32s3r.htm&market=us&lang=en~gen~2col.htm" target="_blank">Section 3 </a>, Symptom Charts for further diagnosis. KEY OFF. GO to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325012.htm~gen~ref.htm#pptDC26" target="_blank">DC26 </a>. </p><p><strong>DC26 CHECK TO ISOLATE MAF SENSOR FROM LEAN DRIVEABILITY OCCURENCE </strong></p><p></p><ul> <li data-xf-list-type="ul"><strong>Note: </strong>Due to increasingly stringent emission/OBD II requirements, a fuel system DTC on some vehicles will be generated without a noticeable driveability concern with or without the MAF sensor disconnected. Under these conditions, if the BARO, LONGFT1, LONGFT2 and MAF V PID indicates a MAF sensor concern, replace the MAF sensor. </li> <li data-xf-list-type="ul">Disconnect the MAF sensor.</li> <li data-xf-list-type="ul">Key on, engine running.</li> <li data-xf-list-type="ul">Drive the vehicle.</li> </ul><p>Is the lean driveability symptom (lack of power, spark knock/detonation, buck/jerk or hesitation/surge on acceleration) gone? </p><p>Yes No REPLACE MAF sensor. </p><p></p><p>RESET Keep Alive random Access Memory (RAM) (REFER to Section 2, <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V322010.htm~gen~ref.htm" target="_blank">Powertrain Control Module (PCM) Reset </a>). </p><p></p><p>VERIFY a symptom no longer exists. <strong>For DTC P0171, P0172, P0174, P0175, P1131, P1132, P1151, P1152, P1130, P1150, P2195, P2196, P2197 or P2198 </strong>: GO to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325048.htm~gen~ref.htm#pptH42" target="_blank">H42 </a>(or GO to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325050.htm~gen~ref.htm#pptHA42" target="_blank">HA42 </a>for natural gas vehicles only). </p><p></p><p><strong>For lean driveability symptoms listed without DTCs </strong>: RETURN to <a href="http://file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~leftside=V32s3l.htm&rightside=V32s3r.htm&market=us&lang=en~gen~2col.htm" target="_blank">Section 3 </a>, Symptom Charts for further diagnosis. </p><p> </p><p>Electrical: </p><ul> <li data-xf-list-type="ul">Short to VPWR in harness or HO2S</li> <li data-xf-list-type="ul">Water in harness connector</li> <li data-xf-list-type="ul">Open/Shorted HO2S circuit</li> <li data-xf-list-type="ul">Corrosion or poor mating terminals and wiring</li> <li data-xf-list-type="ul">Damaged HO2S</li> <li data-xf-list-type="ul">Damaged PCM</li> </ul><p>Fuel System: </p><ul> <li data-xf-list-type="ul">Excessive fuel pressure</li> <li data-xf-list-type="ul">Leaking/contaminated fuel injectors</li> <li data-xf-list-type="ul">Leaking fuel pressure regulator</li> <li data-xf-list-type="ul">Low fuel pressure or running out of fuel</li> <li data-xf-list-type="ul">Vapor recovery system</li> </ul><p>Induction System: </p><ul> <li data-xf-list-type="ul">Air leaks after the MAF</li> <li data-xf-list-type="ul">Vacuum Leaks</li> <li data-xf-list-type="ul">PCV system</li> <li data-xf-list-type="ul">Improperly seated engine oil dipstick</li> </ul><p>EGR System: </p><ul> <li data-xf-list-type="ul">Leaking gasket</li> <li data-xf-list-type="ul">Stuck EGR valve</li> <li data-xf-list-type="ul">Leaking diaphragm or EVR</li> </ul><p>Base Engine: </p><ul> <li data-xf-list-type="ul">Oil overfill</li> <li data-xf-list-type="ul">Cam timing</li> <li data-xf-list-type="ul">Cylinder compression</li> <li data-xf-list-type="ul">Exhaust leaks before or near the HO2S(s</li> </ul></blockquote><p></p>
[QUOTE="hotcobra03, post: 12657998, member: 53096"] have you done a compression test? base engine is a cause..see 1st note [B]H40 DTCs P1131, P1132, P1151, P1152, P2195, P2196, P2197 AND P2198: UPSTREAM HO2S NOT SWITCHING. [/B] [LIST][B]Note: [/B]It is necessary to address all Continuous Memory Ignition and Misfire DTCs, if received during Continuous Memory testing, before addressing any KOER HO2S DTCs. DTC/HO2S Reference List: [LIST] [*]HO2S-11 = DTCs P1131, P1132, P2195 and P2196 [*]HO2S-21 = DTCs P1151, P1152, P2197 and P2198 [/LIST] [*]Check intake air system for leaks, obstructions and damage. [*]Check air cleaner element, air cleaner housing for blockage. [*]Verify integrity of the PCV system. [*]Check for vacuum leaks. [/LIST]Were any concerns found during inspection? Yes No REPAIR as necessary. GO to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325012.htm~gen~ref.htm#pptDC25"]DC25 [/URL]. [B]H41 DTCs P0171, P0172, P0174 AND P0175: FUEL SYSTEM AT THE CORRECTED FUEL TRIM [/B] [LIST][B]Note: [/B]It is necessary to address all Continuous Memory Ignition and Misfire DTCs, if received during Continuous Memory testing, before addressing any Fuel Trim DTCs. Fuel System DTC Reference List: [LIST] [*]Bank 1 = DTCs P0171 (lean) and P0172 (rich) [*]Bank 2 = DTCs P0174 (lean) and P0175 (rich) [/LIST] [*]Check intake air system for leaks, obstructions and damage. [*]Check air cleaner element, air cleaner housing for blockage. [*]Verify integrity of the PCV system. [*]Check fuel delivery system and filter for restriction. [*]Check for vacuum leaks. [/LIST]Were any concerns found during inspection? Yes No REPAIR as necessary. COMPLETE KAM Reset. GO to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325012.htm~gen~ref.htm#pptDC25"]DC25 [/URL]. [B]DC25 DTC P0171, P0172, P0174, P0175, P1131, P1132, P1151, P1152, P1130, P1150, P2195, P2196, P2197, P2198 OR LEAN DRIVEABILITY CONCERNS: CHECK CONDITIONS RELATED TO MAF SENSOR [/B] [LIST][B]Note: [/B]Most weather service reports are a local barometric pressure that has been corrected to sea level. However, the BARO PID reports the actual barometric pressure for the altitude the vehicle is being diagnosed in. Local weather conditions (high or low pressure areas) will change the local barometric pressure by several inches of mercury [+/- 3 Hz. (+/- 1 in.Hg.)]. [*]Verify the MAF sensor is connected. If not, repair as necessary. [*]Key on, engine running. [*]Access the BARO, LONGFT1, LONGFT2 and MAF V PIDs on fully warmed-up engine. [*]Check that the BARO PID is approximately the same as the barometric pressure reading for the location, day and altitude the vehicle is being diagnosed at. [LIST] [*]BARO PID values in Keep Alive Memory require updating at high throttle openings. If vehicle is driven down from higher altitudes for diagnosing, complete three or four heavy accelerations at greater than half-throttle to allow BARO PID to update. [*]BARO PID must be within +/- 6 Hz. (+/- 2 in.Hg.) of the altitude value in Barometric Pressure Reference Chart (at the beginning of this pinpoint test). [*]Make BARO PID comparisons to Barometric Pressure Reference Chart or daily airport barometric pressure reports, if available. [/LIST] [*]Check that the LONGFT1 and LONGFT2 PIDS for all injector banks at idle is not more negative than -12%. [*]Check that the MAF V PID at idle and neutral is not greater than 30% of the normal MAF V listed in [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~leftside=V32s6l.htm&rightside=V32s6r.htm&market=us&lang=en~gen~2col.htm"]Section 6 [/URL], Reference Values (or not greater than 1.1 volts). [/LIST]Are two of the above three checks OK? Yes No [B]For DTC P0171, P0172, P0174, P0175, P1131, P1132, P1151, P1152, P1130, P1150, P2195, P2196, P2197 or P2198 [/B]: GO to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325048.htm~gen~ref.htm#pptH42"]H42 [/URL](or GO to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325050.htm~gen~ref.htm#pptHA42"]HA42 [/URL]for natural gas vehicles only). [B]For driveability symptoms without DTCs [/B]: RETURN to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~leftside=V32s3l.htm&rightside=V32s3r.htm&market=us&lang=en~gen~2col.htm"]Section 3 [/URL], Symptom Charts for further diagnosis. KEY OFF. GO to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325012.htm~gen~ref.htm#pptDC26"]DC26 [/URL]. [B]DC26 CHECK TO ISOLATE MAF SENSOR FROM LEAN DRIVEABILITY OCCURENCE [/B] [LIST][B]Note: [/B]Due to increasingly stringent emission/OBD II requirements, a fuel system DTC on some vehicles will be generated without a noticeable driveability concern with or without the MAF sensor disconnected. Under these conditions, if the BARO, LONGFT1, LONGFT2 and MAF V PID indicates a MAF sensor concern, replace the MAF sensor. [*]Disconnect the MAF sensor. [*]Key on, engine running. [*]Drive the vehicle. [/LIST]Is the lean driveability symptom (lack of power, spark knock/detonation, buck/jerk or hesitation/surge on acceleration) gone? Yes No REPLACE MAF sensor. RESET Keep Alive random Access Memory (RAM) (REFER to Section 2, [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V322010.htm~gen~ref.htm"]Powertrain Control Module (PCM) Reset [/URL]). VERIFY a symptom no longer exists. [B]For DTC P0171, P0172, P0174, P0175, P1131, P1132, P1151, P1152, P1130, P1150, P2195, P2196, P2197 or P2198 [/B]: GO to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325048.htm~gen~ref.htm#pptH42"]H42 [/URL](or GO to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~file=V325050.htm~gen~ref.htm#pptHA42"]HA42 [/URL]for natural gas vehicles only). [B]For lean driveability symptoms listed without DTCs [/B]: RETURN to [URL="file:///C:/TSO/tsocache/USER-PC_216860/V32~us~en~leftside=V32s3l.htm&rightside=V32s3r.htm&market=us&lang=en~gen~2col.htm"]Section 3 [/URL], Symptom Charts for further diagnosis. Electrical: [LIST] [*]Short to VPWR in harness or HO2S [*]Water in harness connector [*]Open/Shorted HO2S circuit [*]Corrosion or poor mating terminals and wiring [*]Damaged HO2S [*]Damaged PCM [/LIST] Fuel System: [LIST] [*]Excessive fuel pressure [*]Leaking/contaminated fuel injectors [*]Leaking fuel pressure regulator [*]Low fuel pressure or running out of fuel [*]Vapor recovery system [/LIST] Induction System: [LIST] [*]Air leaks after the MAF [*]Vacuum Leaks [*]PCV system [*]Improperly seated engine oil dipstick [/LIST] EGR System: [LIST] [*]Leaking gasket [*]Stuck EGR valve [*]Leaking diaphragm or EVR [/LIST] Base Engine: [LIST] [*]Oil overfill [*]Cam timing [*]Cylinder compression [*]Exhaust leaks before or near the HO2S(s [/LIST] [/QUOTE]
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What's causing misfire at 1200-2100 when warm?
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