Exhaust Sulphur Smell - Mazda B-Series 1997 Workshop Manual

FT
TROUBLESHOOTlNG GUIDE
STEP
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INSPECTION
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ACTION
29
1
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Perform Fuel Line Pressure Inspection.
/
Yes
1
Go to next step
EXHAUST SULPHUR SMELL
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page FT-150
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Is fuel line pressure correct?
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DESCRIPTION
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Rotten egg smell (sulphur) from exhaust
NOTE:
Some slight sulphur smell may be normal. Catalysts with less than 8-16 thousand kilometers
(5-10 thousand miles) are more likely to have a sulphur smell concern due to the highly active
state of new catalysts. Replacing the catalyst if no problem is found may actually make the
symptom worse.
Fuel line pressure:
240-280 kPa (2.5-2.8 kgflcm2, 3 5 4 0 psi)
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Vlsually look for fuel leakage at injector 0-ring,
Yes
pressure regulator, and fuel Ilne. Service as
necessary.
No
Perform Fuel Pressure Hold Inspection.
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page FT-150
Does fuel line pressure hold?
Are any diagnostic trouble codes displayed during
Key On Engine Off, Key On Engine Running, or
Continuous Memory inspection?
=
page FT-71
4 Start engine. Disconnect crankcase ventilation hose
from the throttle body. Place a stiff piece of paper
over the hose end.
Does vacuum hold the paper?
Yes
- -
Yes
No
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Zero or low:
Check pressure regulator diaphragm
a-s
page FT-154
Check fuel pump circuit
a-s
page FT-151
High:
Check pressure regulator for high pressure cause
a-s
page FT-154
Check for clogged fuel return line
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Go to next step
Check pressure regulator diaphragm condition
a-s
page FT-154
If condition is OK, check injector
=
page FT-155
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If condition is not OK, replace pressure re<ulator
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Diagnostic trouble code displayed
Check for cause (refer to Diagnostic Trouble Code
chart)
w
page FT-77
No diagnostic trouble codes displayed
Go to next step
Go to next step
Check evaporative emission system as follows:
Disconnect evaporative hose and place a stiff piece
of paper over hose
Does vacuum hold paper?
If yes, check evaporative emission system
page FT-160
If no, check for vacuum leak in PCV system, oil
cap, PCV valve, rocker cover for bolt torquelgasket
leak
1
5
Verify test results. If OK, return to diagnostic index to service any additional symptoms
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