Could my cat be that clogged? - Saturn Sky Forums: Saturn Sky Forum
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post #1 of 11 (permalink) Old 08-12-2019, 08:39 AM Thread Starter
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Could my cat be that clogged?

I have been having a P0420 for a while now. The other day I tried 87 octane gass and it started to run poorly. The more I step on the gas, it boggs down. Idle is smooth, 2007 2.4 auto.
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post #2 of 11 (permalink) Old 08-12-2019, 10:08 AM
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Oh, that could absolutely be a clogged cat.


V.A.L. (#1108)
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post #3 of 11 (permalink) Old 08-12-2019, 11:26 AM
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Perhaps a good feline laxative
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post #4 of 11 (permalink) Old 08-12-2019, 12:19 PM
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Quote:
Originally Posted by Sky_Pilot View Post
Perhaps a good feline laxative
Damn you Sky_Pilot...I have some of the worst mental images in my head now and I can't stop laughing at them...LOL

I also meant to add Tony, best thing to do is remove your cat and verify that it is blocked. Since you have a 2.4, removing it is pretty easy (Drop the exhaust, remove the support bracket on the bottom of the cat, then remove the 3 bolts that hold the cat to the manifold). Take it off and you can look through the cat to see if it is blocked. You should be able to see light coming through it when you hold it up to a light. If very little light comes through it, then it's probably clogged pretty bad.

I think I have my 2.4 cat but I've been hanging onto it in case I ever have a smog issue. (CA...long story) You may find someone in a state that doesn't have CA like smog restrictions that has one laying around.


V.A.L. (#1108)
2007 2.4 Base
MagnaFlow dual outlet, quad tip exhaust test car
**Sold**

Max (#1547)
2007 TURBO 2.4
Too much to list here. See my Garage for details.
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post #5 of 11 (permalink) Old 08-13-2019, 09:23 PM
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I can't believe nobody has told him DO NOT drive it if you have a plugged cat!!!!! You risk engine damage or worse, fire. A regular cat can easily see 1200 degrees, a plugged cat can get as high as 1800+. GMs 2.4L all notorious for cat issues between 80k and 100k. Even the newer 2.4L have this issue. I've seen it on as new as a 2016 Terrain with a 2.4L. Sad part is that GM knows it, but they still use the 2.4L as their workhorse. Guess they'd rather pay for 3 in 10 cats then fix the issue....
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post #6 of 11 (permalink) Old 08-13-2019, 10:28 PM
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There was an extended GM warranty for 10yrs on the 2007 SKYS. It only covered the first 2 or thousand Vin numbers. I know because my Cat went at 28K and it was covered.

Last edited by marlboromike; 08-14-2019 at 03:01 AM.
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post #7 of 11 (permalink) Old 08-14-2019, 08:38 AM
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Originally Posted by The_Ghost View Post
I can't believe nobody has told him DO NOT drive it if you have a plugged cat!!!!! You risk engine damage or worse, fire. A regular cat can easily see 1200 degrees, a plugged cat can get as high as 1800+. GMs 2.4L all notorious for cat issues between 80k and 100k. Even the newer 2.4L have this issue. I've seen it on as new as a 2016 Terrain with a 2.4L. Sad part is that GM knows it, but they still use the 2.4L as their workhorse. Guess they'd rather pay for 3 in 10 cats then fix the issue....
I feel pretty lucky with two 2.4s over 100k miles.

Is the 30% failure rate an actual statistic? It seems really high since they built over 4 million of just the LE5. 30% would be 1.2 million cat replacements.

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post #8 of 11 (permalink) Old 08-14-2019, 08:45 AM
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Yes. I have access to all statistics from DIFM and DIY for almost all repairs. Cats on a 2.4L are like 2.789 in 10. So you have to remember that cats are warranties for 7yrs/100k. So a lot of these are DIY. It's like 62% DIY. I'll have to look it up again to make sure, but this was the one statistic I was really interested in because so many friends have complained about replacing their cat on their 2.4L.
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post #9 of 11 (permalink) Old 08-14-2019, 09:46 AM
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I recognize DIY (Do It Yourself ?) but not DIFM (Do It For Money ?) Probably not.
Where do the actual numbers come from, and is it 2.789 in 10 of cars produced or repairs made or ?

John
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post #10 of 11 (permalink) Old 08-14-2019, 03:08 PM
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When your CAT is clogged, get a new one! And probably get a better built one even if the lower restriction doesn't do you much good on an NA car - the cores seem to be more reliable from what I can gather.

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post #11 of 11 (permalink) Old 08-14-2019, 09:24 PM
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Originally Posted by JohnWR View Post
I recognize DIY (Do It Yourself ?) but not DIFM (Do It For Money ?) Probably not.
Where do the actual numbers come from, and is it 2.789 in 10 of cars produced or repairs made or ?
DIFM is "Do It For Me"....a relatively new term used in the aftermarket. Basically it's service shops/dealerships/tire stores. Anybody that works on a car. We use a few different sources for data that we receive. It was in a report that we received around the first of the year. It listed repairs for:

brakes/rotors
batteries
belts
hoses
waterpumps
cats
headlights
shocks/struts
alternator
suspension items

Basically the top maintenance items for vehicles (broken down by brand as well) and some not so general maintenance items. It gave numbers of repairs as well as number of sales from a parts store (DIY) and dealerships/service garages (DIFM). It gave miles for these repairs as well from 20k up to 300k. I'll look tomorrow and see if I can find the report.
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