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Old 09-14-2005, 12:31 AM   #1
sc2quick
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2001 SC2
Default header and EGR

ok i finally got my OBX headers on this weekend and they work great. top end is soooo much better. BUT two days after i got it welded up my check engine light came on. is this because the EGR flow was cut off? i am almost possitive thats what it is. plus tonight my cars idle kept dropping to the point it would cut off so i pulled over and unhooked the negative battery cable and restarted everything after about 20 mins. car runs fine and the check engine light still hasnt come back on. O and the engine light didnt come on till i got into the car really hard this morning. I am taking the header back off and getting a channel bored into it so the EGR can flow again does anyone think this will help?

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Old 09-14-2005, 06:56 PM   #2
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Default Re: header and EGR

What's the exact code?

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Old 09-14-2005, 08:02 PM   #3
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Default Re: header and EGR

My guess - the precat is gone, and throwing a code.

The EGR valve has nothing to do with the exhaust manifold. But the 00+ S-series have a precat in the front manifold, and the lower O2 sensor monitors this. Now it's gone, and your O2 sensor is going bananas.

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Old 09-20-2005, 01:01 PM   #4
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Default Re: header and EGR

so i cant pass inspection now can i? is there anyway to fix this and will it mess something up? what about the funny idle?

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Old 09-20-2005, 01:38 PM   #5
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Default Re: header and EGR

I'm very interested in this too. Can the O2 senser be relocated to behind the second cat?

I have a 2001 and have an OBX that hasn't been installed yet.

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Old 09-20-2005, 07:45 PM   #6
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Default Re: header and EGR

Quote:
Originally Posted by cloud819
I'm very interested in this too. Can the O2 senser be relocated to behind the second cat?
I think there's already one back there.


You need what's known as a "MIL ELIMINATOR" or "cheater" for your oxygen sensor. These plug in between the sensor and the pigtail, and give your PCM a false reading, making it think there is still a catalyst in there. I have 2 on my V6 Cougar, since I removed 2 precats for the headers.

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Old 09-20-2005, 07:58 PM   #7
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Default Re: header and EGR

Ya go for the MIL eliminator.

And you CANNOT relocate the front o2 to behind the cat. Your car will run like TOTAL crap.

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Old 09-20-2005, 08:34 PM   #8
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Default Re: header and EGR

I gutted the pre-cat on my 01 and never saw an engine code as a result.

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Old 10-25-2005, 03:47 PM   #9
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Default Re: header and EGR

I'll be making the same change on my 2001 here in the coming week. I will be using the same OBX header.

Multiple O2 sensers are not uncommon even in cars with precats. 2 O2 sensers can deturmine failure of the catilyst. I would be surprized if it was the deletion of the precat that is causing the code.

I'm planing on rehooking up my AIR system though. Have you tried doing so?

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Old 10-25-2005, 03:56 PM   #10
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Default Re: header and EGR

The top sensor monitors the air/fuel ratio. This is actually an Oxygen Sensor.

The bottom sensor, in this arragement, anyway, is a CATLYST EFFICIENCY MONITOR. Like its name suggests, it checks the readings of the top sensor and compares them to its own, to gauge how the catalytic converter is doing its job.

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Old 10-27-2005, 02:49 PM   #11
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Default Re: header and EGR

honostly the only problem i am having now is the fact i have no egr. i would suggest getting a channel bored into the flange because if not then the egr will be pointless. the only code my car is tripping now is the one for the cat so ima get a high flow put on and call it a day. but i also will get the flange bored out so i can make the car effeciant.

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Old 10-27-2005, 03:49 PM   #12
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Default Re: header and EGR

Quote:
Originally Posted by sc2quick
honostly the only problem i am having now is the fact i have no egr. i would suggest getting a channel bored into the flange because if not then the egr will be pointless.
Dude, the EGR valve is bolted onto your intake manifold. When installing a header, you don't even TOUCH the EGR valve.

I think you're confusing it with AIR pump.

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Old 10-27-2005, 05:37 PM   #13
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Default Re: header and EGR

Having been through this a few years ago here's what you will most like run in to. I had a hotshot header for my 01 motor, installing it you have to remove the air system just like the OBX headers. There were two primary codes that would be set off; the first was the cat the other was a low flow at start up code dealing with the air pump being deleted. I would clear these when they came up but never thought about them until NC started requiring a smog plug in for the OBD2 cars, sure you can sniff fine but there is a stored code in the computer that can't be bypassed (some one with more experience on the tech2 may be able to help you there) My car would fail every time for this.
The fix was to move to Florida with no inspections, dump all my cats and put a turbo on the car.
Actually now that I'm running a 96 motor in there I put in a reprogrammed computer that I ordered with no limiters, EGR, AIR, emissions and all. It took this computer to finally solve all my issues. There was also the idea that you can get a 2000 Motorola pcm from a non CA/NY emissions car with all the other options as your own but you would have to either find a friend with one and use his vin number for the programming form Saturn or get really lucky in a junk yard.

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Old 10-27-2005, 06:29 PM   #14
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Default Re: header and EGR

2000 Federal Emissions PCM did not have AIR.

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Old 11-06-2005, 03:06 AM   #15
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Default Re: header and EGR

UUUMMMM..... i feel sheepish . your right it was the air pump. i listend to the mechanic who checked the car out. what am i losing from not having it anymore. again i would like to express my feeling stupidity right now

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Old 11-06-2005, 02:17 PM   #16
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Default Re: header and EGR

hey i gota 95 sc2 5spd and i wanna get the OBX headers. will i have the same or simular problem or is it a direct easy no modification needed bolt on?
(plug and play)

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Old 11-06-2005, 05:26 PM   #17
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Default Re: header and EGR

Plug and play on the 95. Just have the tail welded to the cat, and bracket that sucker.

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Old 11-06-2005, 09:33 PM   #18
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Default Re: header and EGR

Quote:
Originally Posted by sc2quick
UUUMMMM..... i feel sheepish . your right it was the air pump. i listend to the mechanic who checked the car out. what am i losing from not having it anymore. again i would like to express my feeling stupidity right now
Ummmm, best case. You have a SES light.

Worst case; The engine kicks into "limp in mode". The engine doesn't run as strong as before because to computer is trying to insuere that the car will run enough to get you to a garage, but not enough to hurt it much more then needed.

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