23 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCatalytic Converter Needed ?
Reported or suspected cause
vacuum leak, no mention of catalytic converter
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Discussions that report identifying a cause
1
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Reported cause · Original poster
Says probable cause is vacuum leak, no mention of catalytic converter.
Leading evidence: 'vacuum leak, no mention of catalytic converter' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'vacuum leak, no mention of catalytic converter' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Inspect oil filter during the upcoming service' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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1
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Performed · outcome unconfirmed
I installed a 90 degree spacer and a straight spacer with adjustable orifice for the post cat O2 sensors.
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Performed · outcome unconfirmed · Original poster
Stopped in at the local Autozone on my way home and they ran the OBD scan.
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Performed · outcome unconfirmed · Original poster
So this morning the CEL came on and I went to my Indy who ran a quick code check.
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Performed · outcome unconfirmed
I'm running a SpeedTech cat delete x-pipe with rest of my system being Fabspeed.
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23 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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I've noticed a slight rattle over the past few months when the window is down and I'm accelerating from a stop, no big deal, I figured maybe something was wearing out slowly. Car was running fine until about a week ago and now is idling roughly(shakes a bit when at an intersection). So this morning the CEL came on and I went to my Indy who ran a quick code check. He said it might be a bad catalytic converter. It's scheduled to be brought in for service later this week anyway, and he wasn't too concerned about me driving it for a few more days. Of course as soon as I left the shop, the CEL didn't come on anymore. Question; can these cars be run without a catalytic converter ? In MN, it is not a requirement.
Why drive the car? Unless he is 100% sure that this is a cat.....you could have serious engine issues brewing. I would definitely be changing the oil and inspecting the oil filter during the upcoming service.
What was the code?
Unfortunately I don't know what the code was. These guys do a lot of Porsche work(it's their specialty) and he felt it was ok to drive. I specifically told him I was concerned about causing damage and he said based on the codes I should be ok.
You could do this, but some adverse effects would be:
More HP at the high end due to lack of back pressure
Lower torque at the low end due to lack of back pressure
Check engine light on because either you won't have post cat O2 sensors plugged in, or if they are in, they won't be doing anything, there is probably some work around, but you'd have to figure it out.
The car would be louder.....might sound cool, might not.
Why not just replace it with a working one?
Some reasons to replace it:
Removing it violates federal emissions laws?
https://www.epa.gov/sites/production...hsysrepair.pdf
Without it, you are spewing more stuff that is bad for people and contributes to global warming?
In order to reduce air pollution, modern automobiles are equipped with a device called a catalytic converter that reduces emissions of three harmful compounds found in car exhaust:
Carbon monoxide (a poisonous gas)
Nitrogen oxides (a cause of smog and acid rain)
Hydrocarbons (a cause of smog)
These are converted into less harmful compounds before leaving the car’s exhaust system. This is accomplished using a catalyst, which gives the device its name.
A reduction and oxidation reaction occurs inside the device. Carbon monoxide (CO) in converted to carbon dioxide (CO2). Nitrogen oxides (NOx) are broken down into nitrogen gas (N2) and oxygen gas (O2). And hydrocarbons (HC) are converted into carbon dioxide (CO2) and water (H2O).
(
http://explorecuriocity.org/Explore/...work-1779.aspx
)
It really comes down to cost. I understand the purpose of the cat, but really wouldn't feel bad driving my one low mileage car around without one. Considering what VW did with all their emissions cheating on a large scale, my car would have little if any impact.
The brand is Davico. They offer 2 year and 25,000 mile warranty on the catalyst. Hopefully they last longer than that, but for the price I can buy a few of them for much less than the stock part.
Stopped in at the local Autozone on my way home and they ran the OBD scan. Only one code; P0301. Says probable cause is vacuum leak, no mention of catalytic converter. Any thoughts on this ?
Phil from Fabspeed here.
That sounds closer to it being correct over the Cat Convertor. It sounds like you might need to get further into the diagnostics over code reading alone. Feel free to give me a call if you have any questions?
<div style="text-align:left;">Appreciate the offer and may take you up on it. Car is headed to my Indy to get it looked at next week anyway, so I'll be curious as to what they come up with for a diagnosis.</div>
You can run a car without a catalytic convertor with no problem. I'm running a SpeedTech cat delete x-pipe with rest of my system being Fabspeed. I installed a 90 degree spacer and a straight spacer with adjustable orifice for the post cat O2 sensors. Very occasionally it'll throw a code when I've hammered on the car really hard. The CEL typically goes away within a day if I don't clear it manually.
The car sounds incredible IMHO. I don't believe it impacted drive-ability at all. Just a touch more throttle at the low end and any torque issues aren't noticeable.
Did you notice any difference in exhaust sound when you replaced your cats with the Davico's? I've got a bad cat that needs replacement, but do not want the exhaust note to change in any way. I also have PSE.
Gbug,
I don't notice anything different about the exhaust note. Especially since I am always in the car. However, I have some friends who say my car sounds amazing.
Just heard back from the shop today, looks like they need to replace the ignition coils. Don't have the final amount yet, but they said it would be about $800.
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