Caution: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.
For dual exhaust systems a quick check of exhaust flow will help determine which side of the exhaust system is restricted. The side that has less exhaust flow is the side that will be suspect, and diagnosis should begin there.
J 35314-A Exhaust Back Pressure Gage
The numbers below refer to the step numbers on the diagnostic table.
The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on the J 35314-A .
Removing the HO2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
This step will isolate the catalytic converter from the remainder of the exhaust system.
Step | Action | Value(s) | Yes | No | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you verify the customers concern? | -- | Go to Step 2 | -- | ||||||||
2 | Did you review the exhaust symptoms diagnostic information and perform the necessary inspections? | -- | Go to Step 3 | |||||||||
3 | Is the system equipped with dual exhaust? | -- | Go to Diagnostic Aids | Go to Step 4 | ||||||||
Does the reading exceed the specified value? | 9 kPa (1.25 psi) | Go to Step 5 | Go to Step 8 | |||||||||
Does the reading exceed the specified value? | 9 kPa (1.25 psi) | Go to Step 6 | Go to Step 7 | |||||||||
6 | Inspect the exhaust system for the following conditions:
Did you find and correct the condition? | -- | Go to Step 8 | -- | ||||||||
7 | Replace the catalytic converter. Refer to Exhaust System Replacement . Did you find and correct the condition? | -- | Go to Step 8 | -- | ||||||||
8 |
Did you correct the condition? | -- | System OK | Go to Step 2 |