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Symptoms of a blocked cat?

4253 Views 3 Replies 4 Participants Last post by  TMcNasty
Spoke to my indy about some misfire issues and he said it could be a blocked cat - no fault codes though have come up... what are usual smptoms for this?
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Potential symptoms,
Idles well but looses all power at high RPM's.
General loss of power.
One way to potentially check this issue is to remove the pre-cat O2 sensor and see if there is an improvement. Of course, you will need to clear a code afterward and it's also going to be noisy.
 

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loss of power is a big one. Most of the time it will trip a code too. Engine will feel "choked" when you try to acceleration. Ive also seen backfiring into the intake with severly blocked cats.
 
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