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Testing the exhaust for backpressure

Tiny
MSMCCORKLE
  • MEMBER
  • 2002 VOLKSWAGEN GTI
  • 138,000 MILES
How do I test the exhaust for excessive backpressure? And if that is the cause of the problem, would that give me my power back and help stop the roughness of the ride and idle?
Thursday, September 1st, 2011 AT 1:53 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
You need to remove the O2 sensors before the cat and using a special tool, check for back pressure. If they are bad, the only thing you can do is replace them.
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Thursday, September 1st, 2011 AT 1:58 AM
Tiny
MSMCCORKLE
  • MEMBER
  • 33 POSTS
The special tool goes in the hole where the oxygen sensors were then? I don't need to actually remove the cat to inspect it?
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Thursday, September 1st, 2011 AT 2:05 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Yes, the pressure gauge screws into where the O2 sensor is removed. As far as the cat, you will know if it is bad by the back pressure. NOTE: When they plug, often times they will get so hot, they glow red hot.
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Thursday, September 1st, 2011 AT 2:08 AM
Tiny
MSMCCORKLE
  • MEMBER
  • 33 POSTS
Thanks for the info, I appreciate it.
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Thursday, September 1st, 2011 AT 2:30 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Glad to help. Let me know if you run into other questions.

Joe
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Thursday, September 1st, 2011 AT 2:49 AM

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