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Old 08-05-2003, 09:24 AM   #1
25psi
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Join Date: Nov 2000
Location: Coram LI NY
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2001 2.5 RS
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Default Could it be my CAT?

Hey guys.

Lately my car feels a bit strange, or so i think. It somewhat feels like it is restricted. Like it wants to go quicker but can not. All my gauges show nothing interesting. Same Volts, same Oil and Fuel pressure. No CEL. Also I just changed spark plugs and fule filter (30K miles).

So.... I thought that MAYBE it is my cat got clogged or something. What do you guys think?

Thanks.

Eugene
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Old 08-05-2003, 12:04 PM   #2
nunyo
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Sounds like it may be a tad rich. Was this condition in place before you replaced your fuel filter? Is your air filter clean? Have you reset the ECU? At 30K I'd doubt that your cat is clogged unless the car has been horribly out of tune for a while.
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Old 08-05-2003, 01:10 PM   #3
25psi
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No, it just started on its own. (If i am not imagining it).

When i changed plugs they looked just fine - Light brown/grey. Just like you would see in the picture under normal.

I did not look at air filter yet. But i think i cleaned it not that long ago. It is AMSOIL. I'll look into it.

And i DID NOT reset ECU after new plugs. Should I?

Eugene

Last edited by 25psi; 08-05-2003 at 01:16 PM.
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Old 08-05-2003, 07:58 PM   #4
25psi
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And i just noticed that spark plug gap on my new plugs is WAY smaller than what i had on old. To be exact .041 Vs .049. Not sure what effect would spark plug gap have. Any ideas?


Eugene
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Old 08-05-2003, 09:58 PM   #5
nunyo
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I'd imagine (but don't know for certain) that a gap that was too small (narrower than spec) might not allow for a complete burn of the fuel/air charge. This could manifest itself in the way you describe.

I was suggesting the ECU reset just as a kind of cheap way to get the car to behave differently. If the new fuel filter is allowing fuel to flow more freely than the old then there might be sufficient cause to reset the ECU so that it can learn the "new" characteristics.
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Old 08-06-2003, 10:53 AM   #6
25psi
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Well, i looked in the manual today. it says that spark plug gap shoyuld be .039 to .044. Mine is .041 + there is a groove in the uppper electrode which makes this gap even larger. And according to DENSO it is indeed so. So, wrong gaping might be rulled out i suppose.

Eugene
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Old 08-07-2003, 07:26 AM   #7
25psi
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Any other ideas?

Eugene
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Old 08-07-2003, 09:34 AM   #8
Opie
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Have the dealer check the cat, I know 2 other peeps with 2001 2.5's that have had cats go bad. It should be free (warranty) unless you are past the 60,000 mile Federal emission control warranty.
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Old 08-07-2003, 11:37 AM   #9
25psi
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How do you check it?

U know how car feels. I can try to describe it. It feels like it needs to be shifted in higher gear. And that it is all too happy to rev down. And like it is constantly pushing through something.

Or i am just totally insane.

Eugene
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Old 08-08-2003, 12:01 AM   #10
25psi
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Any ideas? I am getting upset :+(

Eugene
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Old 08-08-2003, 07:30 AM   #11
spshultz
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There is a way to check for a bad cat using a vacuum gauge but I can't remember exactly. I think that a low vacuum reading is a symptom of excessive backpressure. So you'd need to know what a good baseline reading is and then compare it to yours.
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