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
\'03 White Lux
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
\'03 White Lux
<HTML><HEAD><TITLE>Service Information</TITLE>
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<TD align=middle width="50%">Document ID# 839436
2003 HUMMER
H2
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<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>
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<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>
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H2
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Just Kidding,
I'm really not that ignorant!!!
Ric-H2
If you can't be a good example...Then you might as well be a horrible warning!
www.meatspin.com
Thank you very much for the help and taking the time to look up those bulletins.
Rich
\'03 White Lux
Rich - When your truck gets fixed, please post an update.
Klaus
Rare 2003 H2 with UM8 Integrated Navigation Radio
Skull & Bones Member since 2003
What`s the meaning of life?
" S & B Member Since 2003 "
My Video Collectionez
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
-Jason
www.somo.com - Custom. Accessories. Home of the H2 Source and the H3 Source.
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