Clanking noise

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Mar 26, 2010 | 05:44 AM

#31

Lexmex

CL Community Team

Joined: Apr 2004

Posts: 17,321

Likes: 204

From: Miami, Florida

Quote:

Originally Posted by ilanh

nothing special, seems normal ehaust smell.
When starting at morning smell more like fuel and the RPM around 1,500 but will come down to 750 and normal smell aftre engine get warm

It might not be the main cat underneath the vehicle, but rather one of the two precats further upstream. This is the reason I recommend people get an OBD2 scanner or some kind of software hookup if they have a laptop so they can see what is occurring. If you have a blocked cat, the acceleration is going to be noticeably diminished.

One thing I could recommend is you disconnect your battery cables for a few minutes, reconnect them and then drive a about 15 minutes, half city, and at least one period of time where you can get above 100 km/h even if for a few seconds. And see if the situation is better, worse or the same as before. It is possible a check engine light may come on (and that would help toward diagnosing the issue).

I won't disregard the idea that bad gas can cause issues with cats. I had such an issue in Mexico one time driving in a rural area where the gasoline was adulterated.