|
I get a bad bog or hesitation upon starting off after my truck has sitting for approximately an hour after it has been warmed up. If I gas it , it will backfire , if I let off and then gas it again it runs fine. It will only do it 3 or 4 times a week and it doesnt last long enough to trigger a code.
Does anyone have any ideas? My brother is a mechanic at one of the local G.M. Dealerships and said maybe an injector was bleeding down.??? Any Ideas ??? Rich |
I get a bad bog or hesitation upon starting off after my truck has sitting for approximately an hour after it has been warmed up. If I gas it , it will backfire , if I let off and then gas it again it runs fine. It will only do it 3 or 4 times a week and it doesnt last long enough to trigger a code.
Does anyone have any ideas? My brother is a mechanic at one of the local G.M. Dealerships and said maybe an injector was bleeding down.??? Any Ideas ??? Rich |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Service Information</TITLE> <META http-equiv=Content-Type content="text/html; charset=windows-1252"> <META content="MSHTML 6.00.2800.1276" name=GENERATOR></HEAD> <BODY bgColor=#ffffff> <FORM name=topNavForm action=/servlets/CellHandler> <TABLE width="100%" align=center> <TBODY> <TR> <TD width="25%" slign="LEFT"><INPUT onclick="java_script: history.back[);" type=button value="<- Back" name=back><INPUT onclick="java_script: history.forward[);" type=button value="Forward ->" name=forward> </TD> <TD align=middle width="50%">Document ID# 839436 2003 HUMMER H2 </TD> <TD align=right width="25%"><INPUT onclick="java_script: window.print[);" type=button value=Print name=print> </TD></TR></TBODY></TABLE> <HR> </FORM> <H1>Backfire</H1> <TABLE width="100%" border=1> <TBODY> <TR> <TH vAlign=bottom align=middle> Inspections</P></TH> <TH vAlign=top align=middle> Actions</P></TH></TR> <TR> <TD vAlign=top align=left colSpan=2> DEFINITION: Fuel ignites in the intake manifold or in the exhaust system, making a loud popping noise.</P></TD></TR> <TR> <TD vAlign=top align=left> Preliminary Inspections</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Refer to Important Preliminary Inspections Before Starting in <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30562&RefDoc=839436">Sympto ms - Engine Controls</A> . <LI>Search for bulletins. <LI>Verify that the powertrain control module (PCM) grounds are clean, tight, and in the proper locations. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62050&RefDoc=839436">Power and Grounding Component Views</A> in Wiring Systems and <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30158&RefDoc=839436">Engine Controls Schematics</A> . </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Fuel System</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Inspect for incorrect fuel pressure. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30144&RefDoc=839436">Fuel System Diagnosis</A> . <LI>Inspect for a contaminated fuel condition. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30353&RefDoc=839436">Alcoho l/Contaminants-in-Fuel Diagnosis</A> . <LI>Inspect the fuel injectors. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30125&RefDoc=839436">Fuel Injector Coil Test</A> , <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30403&RefDoc=839436">Fuel Injector Balance Test with Special Tool</A> or <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30404&RefDoc=839436">Fuel Injector Balance Test with Tech 2</A> . <LI>Verify that each injector harness is connected to the correct injector or cylinder. Relocate injector harnesses as necessary. </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Sensor/System</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Inspect the air intake system and crankcase for air leaks. <LI>Inspect the crankcase ventilation valve for proper operation. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=65607&RefDoc=839436">Crankc ase Ventilation System Inspection/Diagnosis</A> in Engine Mechanical. <LI>Inspect for an inaccurate speedometer. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=51427&RefDoc=839436">Sympto ms - Instrument Panel, Gages and Console</A> in Instrument Panel, Gages, and Console. <LI>Use a scan tool in order to monitor the knock sensor (KS) system for excessive spark retard activity. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30557&RefDoc=839436">Knock Sensor (KS) System Description</A> . </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Ignition System</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Inspect for proper ignition voltage output with J 26792 Spark Tester . <LI>Remove spark plugs and inspect for the following: <UL type=SQUARE> <LI>Wet plugs <LI>Cracks <LI>Wear <LI>Improper gap <LI>Burned electrodes <LI>Heavy deposits </LI>[/list]</LI>[/list] Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30554&RefDoc=839436">Spark Plug Inspection</A> .</P> <UL type=BULLET> <LI>An improper spark plug gap will cause a driveability problem. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30554&RefDoc=839436">Spark Plug Inspection</A> . Gap the spark plugs using a wire gage gap tool . Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30325&RefDoc=839436">Spark Plug Replacement</A> . <LI>Determine the cause of the fouling before replacing the spark plugs. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30554&RefDoc=839436">Spark Plug Inspection</A> for diagnosis. <LI>Visually and physically inspect secondary ignition for the following: <UL type=SQUARE> <LI>Ignition wires arcing to ground <LI>Ignition coils arcing to ground </LI>[/list] <LI>Soak the secondary ignition system with water from a spray bottle. Soaking the secondary ignition system may help locate damaged or deteriorated components. Look and listen for arcing or misfiring as you apply the water. <LI>Monitor the Misfire Current Counters while driving the vehicle in the conditions that the misfire occurred. If a misfiring cylinder can be located, use the DTCP0300 table for diagnosis. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30479&RefDoc=839436">DTC P0300</A> <LI>Inspect for loose ignition coil grounds. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30190&RefDoc=839436">Electr onic Ignition (EI) System Diagnosis</A> . </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Engine Cooling System</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Inspect the engine coolant level for being low. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=37222&RefDoc=839436">Loss of Coolant</A> in Engine Cooling. <LI>Inspect the engine thermostat for proper operation and for the correct heat range. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=37167&RefDoc=839436">Thermo stat Diagnosis</A> in Engine Cooling. </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Engine Mechanical</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Inspect engine mechanical for the following: <UL type=SQUARE> <LI>Compression--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=43985&RefDoc=839436">Engine Compression Test</A> in Engine Mechanical. <LI>Sticking or leaking valves <LI>Worn camshaft lobes <LI>Valve timing <LI>Bent push rods <LI>Worn rocker arms <LI>Broken valve springs <LI>Excessive oil in combustion chamber or leaking valve seals--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=44067&RefDoc=839436">Oil Consumption Diagnosis</A> in Engine Mechanical. </LI>[/list] <LI>For incorrect basic engine parts. Inspect the following: <UL type=SQUARE> <LI>The camshaft--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=44059&RefDoc=839436">Camsha ft and Bearings Cleaning and Inspection</A> in Engine Mechanical. <LI>The cylinder heads--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=44030&RefDoc=839436">Cylind er Head Cleaning and Inspection</A> in Engine Mechanical. <LI>The pistons, etc.--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=44085&RefDoc=839436">Piston , Connecting Rod, and Bearings Cleaning and Inspection</A> in Engine Mechanical. </LI>[/list] <LI>Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=44155&RefDoc=839436">Sympto ms - Engine Mechanical</A> in Engine Mechanical for diagnosis procedures. </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Additional Inspections</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Visually and physically inspect the vacuum hoses for splits, kinks, and proper connections and routing as shown on the Vehicle Emission Control Information label. <LI>Inspect the intake manifold and the exhaust manifold passages for casting flash. <LI>Inspect the transmission torque converter clutch (TCC) operation. The scan tool should indicate an RPM drop when the TCC is commanded ON. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=75303&RefDoc=839436">Diagno stic System Check - Automatic Transmission</A> in Automatic Transmission-4L60-E. <LI>Inspect the exhaust system for possible restrictions. Inspect the following: <UL type=SQUARE> <LI>Inspect the exhaust system for damaged or collapsed pipes. <LI>Inspect the mufflers for heat distress or possible internal failure. <LI>Inspect for possible plugged catalytic converters. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62242&RefDoc=839436">Restri cted Exhaust</A> in Engine Exhaust. </LI>[/list]</LI>[/list] <UL type=BULLET> <LI>Electromagnetic interference (EMI) on the reference circuit can cause an engine miss condition. A scan tool can usually detect EMI by monitoring the engine RPM. A sudden increase in RPM with little change in actual engine RPM change may indicate that EMI is present. If a problem exists, inspect for high voltage components near the ignition control circuits. <LI>Inspect the park/neutral position (PNP) switch operation. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=6964&RefDoc=839436">Park/Neutral Position Switch Adjustment</A> in Automatic Transmission-4L60-E. <LI>Inspect for faulty motor mounts. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=44042&RefDoc=839436">Engine Mount Inspection</A> in Engine Mechanical. <LI>Inspect the intake manifold and the exhaust manifold passages for casting flash </LI>[/list]</TD></TR></TBODY></TABLE> <FORM name=bottomNavForm> <HR> <TABLE width="100%" align=center> <TBODY> <TR> <TD width="25%" slign="LEFT"><INPUT onclick="java_script: history.back[);" type=button value="<- Back" name=back><INPUT onclick="java_script: history.forward[);" type=button value="Forward ->" name=forward> </TD> <TD align=middle width="50%">Document ID# 839436 2003 HUMMER H2 </TD> <TD align=right width="25%"><INPUT onclick="java_script: window.print[);" type=button value=Print name=print> </TD></TR></TBODY></TABLE></FORM></BODY></HTML> |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Service Information</TITLE> <META http-equiv=Content-Type content="text/html; charset=windows-1252"> <META content="MSHTML 6.00.2800.1276" name=GENERATOR></HEAD> <BODY bgColor=#ffffff> <FORM name=topNavForm action=/servlets/CellHandler> <TABLE width="100%" align=center> <TBODY> <TR> <TD width="25%" slign="LEFT"><INPUT onclick="java_script: history.back[);" type=button value="<- Back" name=back><INPUT onclick="java_script: history.forward[);" type=button value="Forward ->" name=forward> </TD> <TD align=middle width="50%">Document ID# 839324 2003 HUMMER H2 </TD> <TD align=right width="25%"><INPUT onclick="java_script: window.print[);" type=button value=Print name=print> </TD></TR></TBODY></TABLE> <HR> </FORM> <H1>Hesitation, Sag, Stumble</H1> <TABLE width="100%" border=1> <TBODY> <TR> <TH vAlign=bottom align=middle> Inspection/Tests</P></TH> <TH vAlign=bottom align=middle> Action</P></TH></TR> <TR> <TD vAlign=top align=left colSpan=2> DEFINITION: Momentary lack of response as the accelerator is pushed down. Can occur at any vehicle speed. Usually more pronounced when first trying to make the vehicle move, as from a stop. May cause the engine to stall if severe enough.</P></TD></TR> <TR> <TD vAlign=top align=left> Preliminary</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Refer to Important Preliminary Inspections Before Starting in <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30562&RefDoc=839324">Sympto ms - Engine Controls</A> . <LI>Search for bulletins. <LI>Verify that the powertrain control module (PCM) grounds are clean, tight, and in the proper locations. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30158&RefDoc=839324">Engine Controls Schematics</A> . </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Sensor/System</P></TD> <TD vAlign=top align=left> Inspect the manifold absolute pressure (MAP) sensor operation.</P></TD></TR> <TR> <TD vAlign=top align=left> Fuel System</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Inspect for incorrect fuel pressure. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30144&RefDoc=839324">Fuel System Diagnosis</A> . <LI>Inspect for a contaminated fuel condition. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30353&RefDoc=839324">Alcoho l/Contaminants-in-Fuel Diagnosis</A> . <LI>Verify that both fuel injector fuses are not open. An open fuel injector fuse causes 4ignition coils and 4fuel injectors not to operate. Inspect the ignition coil circuits and the fuel injector circuits for an intermittent short to ground. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62194&RefDoc=839324">Circui t Testing</A> and <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61965&RefDoc=839324">Wiring Repairs</A> in Wiring Systems. Replace the fuse. <LI>Inspect for the following that may cause the engine to run rich: <UL type=SQUARE> <LI> <H4><FONT color=blue>Notice</H4></FONT> Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=10174&RefDoc=839324"><FONT color=blue>Heated Oxygen and Oxygen Sensor Notice</FONT></A> in Cautions and Notices.</P>Water intrusion in the heated oxygen sensor (HO2S) connector <LI>Engine oil contaminated by fuel <LI>An evaporative emission (EVAP) canister purge condition <LI>Incorrect fuel pressure--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30144&RefDoc=839324">Fuel System Diagnosis</A> . <LI>Leaking fuel injectors--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30144&RefDoc=839324">Fuel System Diagnosis</A> . <LI>An inaccurate mass air flow (MAF) sensor <LI>Blockage on the inlet screen of the MAF sensor--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30405&RefDoc=839324">Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement</A> . <LI>Vacuum hoses that are split, kinked, or improperly connected <LI>An air intake duct that is collapsed or restricted--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=69209&RefDoc=839324">Air Cleaner Resonator Outlet Duct Replacement</A> . <LI>An air filter that is dirty or restricted--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30328&RefDoc=839324">Air Cleaner Element Replacement</A> . </LI>[/list] <LI>Inspect for the following conditions that may cause the engine to run lean: <UL type=SQUARE> <LI> <H4><FONT color=blue>Notice</H4></FONT> Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=10174&RefDoc=839324"><FONT color=blue>Heated Oxygen and Oxygen Sensor Notice</FONT></A> in Cautions and Notices.</P>Water intrusion in the HO2S connector <LI>An exhaust leak between the HO2S and the engine--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=37907&RefDoc=839324">Exhaus t Leakage</A> in Engine Exhaust. <LI>Vacuum leaks <LI>Incorrect fuel pressure--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30144&RefDoc=839324">Fuel System Diagnosis</A> . <LI>Restricted fuel injectors--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30403&RefDoc=839324">Fuel Injector Balance Test with Special Tool</A> or <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30404&RefDoc=839324">Fuel Injector Balance Test with Tech 2</A> . <LI>An inaccurate MAF sensor <LI>Fuel contamination--Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30353&RefDoc=839324">Alcoho l/Contaminants-in-Fuel Diagnosis</A> . <LI>Vacuum hoses that are split, kinked, or improperly connected </LI>[/list]</LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Ignition System</P></TD> <TD vAlign=top align=left> <UL type=BULLET> <LI>Soak the secondary ignition system with water from a spray bottle. Soaking the secondary ignition system may help locate damaged or deteriorated components. Look and listen for arcing or misfiring as you apply water. <LI>Test for proper ignition voltage output with the J 26792 Spark Tester . Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30190&RefDoc=839324">Electr onic Ignition (EI) System Diagnosis</A> for the procedure. <LI>Remove the spark plugs and check for the following: <UL type=SQUARE> <LI>Correct heat range <LI>Wet plugs <LI>Cracks <LI>Wear <LI>Improper gap <LI>Burned electrodes <LI>Heavy deposits </LI>[/list]</LI>[/list] Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30554&RefDoc=839324">Spark Plug Inspection</A> .</P> <UL type=BULLET> <LI>An improper spark plug gap will cause a driveability problem. Gap the spark plugs using a wire gage gap tool. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30325&RefDoc=839324">Spark Plug Replacement</A> . <LI>Determine the cause of the fouling before replacing the spark plugs. <LI>Monitor the Misfire Current Counters while driving the vehicle in the conditions that the misfire occurred. If a misfiring cylinder can be located, use the DTCP0300 table for diagnosis. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30479&RefDoc=839324">DTC P0300</A> . <LI>Inspect for loose ignition coil grounds. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30190&RefDoc=839324">Electr onic Ignition (EI) System Diagnosis</A> . </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Engine Cooling System</P></TD> <TD vAlign=top align=left> Inspect the engine thermostat for proper operation and for proper heat range. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=37167&RefDoc=839324">Thermo stat Diagnosis</A> in Engine Cooling.</P></TD></TR> <TR> <TD> Engine Mechanical</P></TD> <TD> Inspect for excessive crankshaft endplay that will cause the crankshaft position (CKP) sensor reluctor wheel to move out of alignment with the CKP sensor. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=44076&RefDoc=839324">Cranks haft and Bearings Cleaning and Inspection</A> in Engine Mechanical. This could result in any of the following conditions:</P> <UL type=BULLET> <LI>A no start <LI>A start and stall <LI>Erratic performance </LI>[/list]</TD></TR> <TR> <TD vAlign=top align=left> Additional Inspections</P></TD> <TD vAlign=top align=left> Inspect the generator output voltage. Refer to <A href="http://127.0.0.1:9001/servlets/CellHandler?CellId=37779&RefDoc=839324">Diagno stic System Check - Engine Electrical</A> in Engine Electrical for the procedure. Repair the charging system if the generator output voltage is less than 9volts or more than 16volts.</P></TD></TR></TBODY></TABLE> <FORM name=bottomNavForm> <HR> <TABLE width="100%" align=center> <TBODY> <TR> <TD width="25%" slign="LEFT"><INPUT onclick="java_script: history.back[);" type=button value="<- Back" name=back><INPUT onclick="java_script: history.forward[);" type=button value="Forward ->" name=forward> </TD> <TD align=middle width="50%">Document ID# 839324 2003 HUMMER H2 </TD> <TD align=right width="25%"><INPUT onclick="java_script: window.print[);" type=button value=Print name=print> </TD></TR></TBODY></TABLE></FORM></BODY></HTML> |
Hey why can't I go back or forward!!!
 Just Kidding, I'm really not that ignorant!!! Ric-H2 |
Hey Klaus,
Thank you very much for the help and taking the time to look up those bulletins. Rich |
Glad to help. I finally figured out how to post these in HTML format so they look OK.
Rich - When your truck gets fixed, please post an update. Klaus Rare 2003 H2 with UM8 Integrated Navigation Radio  Skull & Bones Member since 2003 |
Klaus,
What`s the meaning of life? " S & B Member Since 2003 " |
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by DennisAJC:
Klaus, What`s the meaning of life? <HR></BLOCKQUOTE> Hell, I don't know... I need to GET a life! I spend way too much time on the net! Klaus Rare 2003 H2 with UM8 Integrated Navigation Radio Skull & Bones Member since 2003 |
You guys are too much!!!!
-Jason |
| All times are GMT +1. The time now is 07:52 PM. |
Powered by vBulletin Version 3.0.7
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.