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Doohickie -> RE: Trouble with Engine Code P0300 P0301 P0304 (8/1/2007 7:28:30 AM)
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Technical Service Bulletin
Group
36 - Engine Electrical
Number
99-36-014
Subject
Date
MISFIRE CODE DIAGNOSIS
09-1999
Model
Accent 1996-2000, Elantra 1996-2000, Sonata 1996-2000 and Tiburon 1997-2000
Misfire code diagnosis
This Technical Service Bulletin supersedes 97-90-012. Please discard the old TSB and replace it with this new one.
A Guide To Repairing Misfire Codes
Please read through this entire bulletin before using any portion of this repair guide. All terms, components and specific procedures are described in the main body of this TSB.
On the 1st repair attempt:
Record misfire codes. Choose the most appropriate category from the four (4) selections below:
One cylinder has a misfire code (see procedure A)
Paired misfire codes as described below (see procedure B)
Cylinders 1 and 4 or
cylinders 2 and 3 (4 cylinder engines)
Cylinders 1 and 4 or
cylinders 2 and 5, or
cylinders 3 and 6 (V6 engines)
Multiple cylinders have misfire codes, and/or there is a random misfire code (see procedure C)
Misfire code (one or more) occurs only on cold startup (see procedure D)
Procedure A
(One cylinder misfire code)
Mist spark plug wires and check for arcing.
Remove spark plugs and check for evidence of carbon tracking.
Perform cylinder leakage (leak-down) test.
If leakage is less than 10%, continue to step 4.
If leakage is 10% or greater, remove the head to perform valve job. (See specifics in cylinder head section).
Replace spark plugs. Lightly apply dielectric grease to the spark plug wire tip/boot base.
If misfire is in cylinder #4 (P0304) on Elantra or Tiburon, loosen and retorque the M12 cylinder head bolts to 26 ft-lbs + 60° angle + 60° angle.
In the misfiring cylinder, swap injector with another cylinder.
Procedure B
(Two misfire codes that are coil paired; Cylinders 1 and 4 or
cylinders 2 and 3 (4 cylinder engines); Cylinders 1 and 4 or
cylinders 2 and 5, or
cylinders 3 and 6 (V6 engines))
Mist spark plug wires and check for arcing.
Remove plugs and check for evidence of carbon tracking.
Perform cylinder leakage (leak-down) test.
If leakage is less than 10%, continue to step 4.
If leakage is 10% or greater, remove the head to perform valve job. (See specifics in cylinder head section).
Replace the coil.
Procedure C
(Multiple cylinders misfire codes, and/or a random misfire code)
Check LT (Long Term) fuel trim. If over 10%, check fuel pressure.
Check AFS calibration against known good value.
Check for proper operation of EGR and purge control valve.
Mist spark wires and check for arcing.
Remove spark plugs and check for evidence of carbon tracking.
Perform cylinder leakage (leak-down) test.
If leakage is less than 10%, continue to step 7.
If leakage is 10% or greater, remove the head to perform valve job. (See specifics in cylinder head section).
Check fuel sample from the inlet (bottom side) of the filter to check for the presence of water or contamination.
Check intake air supply for evidence of oil in the air cleaner or on the AFS.
Tweak pins on
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