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Old May 12th, 2020, 02:50 PM   #1 (permalink)
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Headers to solve P0431

Hey guys I just bought a white 08 gt. Beautiful car. I joined club4g to tap into the wealth of eclipse-specific knowledge here and it’s been incredibly helpful. Thank you all.

So here’s my current issue...
Right after I got the car home the SES light came on and code P0431 came up. I did some reading on here and came to the conclusion that I need to replace the exhaust manifold/pre-cat on the front bank. It seems only logical that the rear manifold will fail soon too. So I’ve decided to install aftermarket headers to solve the issue for good, and squeeze a little extra power out of my baby at the same time...

I contacted RRE and, to my dismay, they informed me that they are sold out of gt headers and won’t be making any more for quite a while. I haven’t heard anything good about OBX headers, and I was wondering if there are better options available. Any and all input is appreciated. Thanks.
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Old May 12th, 2020, 03:16 PM   #2 (permalink)
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You're stuck with those 2 choices. RRE ones pop up for sale now and then though

In either case, you're gonna need a tune to disable the rear O2 checks to remove the code. Fastworks is who tunes 4G eclipse
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Old May 12th, 2020, 09:46 PM   #3 (permalink)
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Good news! I talked to RRE again and I got the last set available. So my question now is do the spacers for the downstream o2 sensors not make up for the difference in headers? And can I run them with the stock tune?
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Old May 12th, 2020, 10:04 PM   #4 (permalink)
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Also, about how much would it cost to tune my car? Is it something that can be done with a laptop and a cord or does it have to be done in person? It would be nice to have the light gone so I’ll notice if another issue pops up, but I’m not terribly concerned about the light itself. I’m putting the headers on because the pre-cat is so plugged up that my car feels like it’s having a hard time accelerating from around 2500 to 3500 rpm.
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Old May 12th, 2020, 10:59 PM   #5 (permalink)
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Quote:
Originally Posted by its_a_gt_bruh View Post
Also, about how much would it cost to tune my car? Is it something that can be done with a laptop and a cord or does it have to be done in person? It would be nice to have the light gone so I’ll notice if another issue pops up, but I’m not terribly concerned about the light itself. I’m putting the headers on because the pre-cat is so plugged up that my car feels like it’s having a hard time accelerating from around 2500 to 3500 rpm.
Tactrix 2.0 and Fastworks
$180 for cable and $350 for NA tune, editor, logger, more $$ for turbo tune

You can do serious engine damage driving on clogged pre cats btw
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Old May 12th, 2020, 11:42 PM   #6 (permalink)
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Funny. I've talked to dozens of people who got the last set too, hahaha.
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Old May 13th, 2020, 09:46 AM   #7 (permalink)
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Well if that’s their tactic, then it works. I bought them quick, fast, and in a hurry. Thanks for the info.
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Old May 13th, 2020, 01:07 PM   #8 (permalink)
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The market section of the forum sometimes has good deals on parts other 4G members are parting with. But nothing beats new, right? Also, i think Michael (Hackish) can provide an eco tune for your GT in case things get hairy with gas prices in the future. If not worried about gas then he can still tune your GT for a nice power squeeze and will make your baby a beast. My GS runs alot more smoother with Fastworks tune.
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Old May 13th, 2020, 01:39 PM   #9 (permalink)
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It's the same tune. You can't add power to NA unless you make it run more efficiently.
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Old May 13th, 2020, 05:52 PM   #10 (permalink)
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It's the same tune. You can't add power to NA unless you make it run more efficiently.
Yeah the tune literally just makes the fueling table target AFRs leaner, and smooths pit and increases ignition timing, rev limiter and speed limiter, cat code modification

Leaning it out makes more power and better gas mileage, downside for EPA is that the cats don’t work as well because they take way longer to heat up and work properly, that’s why the stock tune is so rich

The only way you can make more power on an NA car is to lean it out and increase timing as much as you can safely for the octane of fuel it’s going to run, higher octane can allow a little more timing advance that’s all

Boosted is another story completely

NA: eco tune = power tune pretty much

I know the boosted cars like the WRX which require premium, people will make an ECO tune to lock the boost controller and wastegate to make low boost, lower ignition timing and maybe richen fuel so that they can run lower octane fuel than premium, helps save money

I guess the Eclipse GT could benefit from leaning out and reducing timing to run 87 oct efficiently for an Eco tune that still makes good power, more timing for more power with premium octane

Same for GS, although it’s made to come from factory for 87 oct on its tune, it can be made premium only just like the GT by increasing spark timing, but that’s more cost for a few HP, depends if it’s worth it to you or not, it’s not for me personally
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Old May 13th, 2020, 10:07 PM   #11 (permalink)
140whp+15.72%= 162hp
 
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It all comes down to how much cash you have and want to spend. Me? Im the poorest mofo on Sesame Street. 😂🤣
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Old May 15th, 2020, 02:47 PM   #12 (permalink)
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I took some pictures of my downstream o2 sensor voltage graphs from a handheld scanner. Could someone tell me if these are indicative of a plugged pre-cat? Something definitely seems off here, but I’m not exactly a mechanic and diagnosing problems isn’t my strong suit...

Edit: these readings were taken at ~2000 rpm

Last edited by its_a_gt_bruh; May 15th, 2020 at 04:32 PM.
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Old May 15th, 2020, 04:58 PM   #13 (permalink)
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Quote:
Originally Posted by its_a_gt_bruh View Post
I took some pictures of my downstream o2 sensor voltage graphs from a handheld scanner. Could someone tell me if these are indicative of a plugged pre-cat? Something definitely seems off here, but I’m not exactly a mechanic and diagnosing problems isn’t my strong suit...

Edit: these readings were taken at ~2000 rpm
Bank 2 looks clogged, not enough range there, and not in the correct range

Do you have a code P0431?
If not, that could still mean your cat is clogged, as those cat codes are more commonly tripped by the cat allowing too much exhaust through as in the case of the cat breaking apart or not existing at all, rather than when it clogs up too much

Last edited by pcfreak4; May 15th, 2020 at 05:58 PM.
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Old May 16th, 2020, 07:54 AM   #14 (permalink)
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Thanks for the reply, pcfreak. It’s showing p0431 and another code for power steering pressure switch. It’s got a rough idle too, and slow acceleration/bad throttle response in mid to low range rpm. Is there a way to confirm this is the problem?
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Old May 16th, 2020, 10:12 AM   #15 (permalink)
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Thanks for the reply, pcfreak. It’s showing p0431 and another code for power steering pressure switch. It’s got a rough idle too, and slow acceleration/bad throttle response in mid to low range rpm. Is there a way to confirm this is the problem?
Definitely try changing out the O2 sensor(s) with new Denso OEM ones first, get the part numbers off of Rockauto; especially the bank 2 sensor 2 after cat

But I'm gonna say your cat on bank 2 is definitely clogged

4cyl or 6cyl btw? 6 I assume based on your username?

Power steering switch won't cause any running issue with the engine, if your steering is still working fine then it's safe to say the pressure switch just went bad, although check your power steering system manually (good fluid level, no weird noises when turning, serpentine belt in good condition, PS pulley turns with belt and isn't seized, no leaks)

Edit: how old are your spark plugs?

Last edited by pcfreak4; May 16th, 2020 at 10:16 AM.
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Old May 18th, 2020, 09:10 AM   #16 (permalink)
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It’s a 6 cyl. I’m not sure how old the spark plugs are. I bought the car a couple weeks ago and haven’t done much to it since. Last weekend’s project was changing a wheel bearing. This weekend hopefully my headers will be here. I’ll change plugs while I’m at it.

Not sure about getting a new downstream o2 if I’m installing RRE headers. It seems like the headers and spacers setup is likely to cause issues, and I’d be wasting money (that my broke ass doesn’t have) on a new denso sensor.

I topped off the PS fluid a week ago and it’s still full. No visible issues with the system and it drives fine.
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Old May 18th, 2020, 11:12 AM   #17 (permalink)
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It’s a 6 cyl. I’m not sure how old the spark plugs are. I bought the car a couple weeks ago and haven’t done much to it since. Last weekend’s project was changing a wheel bearing. This weekend hopefully my headers will be here. I’ll change plugs while I’m at it.

Not sure about getting a new downstream o2 if I’m installing RRE headers. It seems like the headers and spacers setup is likely to cause issues, and I’d be wasting money (that my broke ass doesn’t have) on a new denso sensor.

I topped off the PS fluid a week ago and it’s still full. No visible issues with the system and it drives fine.
The spark plugs on the 6 cyl are a bitch compared to the 4 cyl

Are your O2 sensors Denso brand or are they something else?
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Old May 19th, 2020, 03:33 PM   #18 (permalink)
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I’m not sure. I bought the car used a few weeks ago. Its service history is a complete mystery to me. I won’t know until I install those headers.
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Old May 19th, 2020, 08:03 PM   #19 (permalink)
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I’m not sure. I bought the car used a few weeks ago. Its service history is a complete mystery to me. I won’t know until I install those headers.
U could look at them

They’re also cheap on rockauto and amazon compared to an auto parts store
Like $25 instead of $100
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Old May 19th, 2020, 11:11 PM   #20 (permalink)
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Don't forget the 5% discount in the vendor section either
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