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Discussion Starter #1
I have an 02 Se-R that is running lean. Someone told me this should not be bad for the car at all, others say it is better to fix the a/f ratio. Opinions? If I did want to even the a/f out, how would I go about doing that?:confused:
 

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running lean isnt that good for an engine you might run into problems down the road, is the car completly stock, and how do you know that its running lean?
 

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The car is about to reach 70k miles and it has a cold air intake and aftermarket exhaust. I've had all the recalls done and the reason I say its running rich is because of the smell, in the mid ranges, but it isnt that rotten egg smell that some people say. Which is usually the butterfly screws coming loose and getting sucked in.
The car runs great and the smell shows up whenever i down shift which isnt too often and I always run on 91 octane (no higher in CA) usually chevron or shell.
 

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well with a cold air intake and an upgraded exhaust, you have a lot better flow through the car maybe the computers not reading that right and dumping more fuel, thats why i dont like factory computers and want to upgrade mine to an adjustable unit. try upgrading some ignition components to increase the effienecy of the ignition system, like a grouding kit or an msd system if ya got the money. i dont know about the smell though because on my last car (91 ford escort, yeah i know but it ran all the way to the dealership lol) i had the rotten egg smell and i had to replace the head gasket because coolant was leaking in bad.
 

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I have an 02 Se-R that is running lean. Someone told me this should not be bad for the car at all, others say it is better to fix the a/f ratio. Opinions? If I did want to even the a/f out, how would I go about doing that?:confused:
The car is about to reach 70k miles and it has a cold air intake and aftermarket exhaust. I've had all the recalls done and the reason I say its running rich is because of the smell, in the mid ranges, but it isnt that rotten egg smell that some people say. Which is usually the butterfly screws coming loose and getting sucked in.
The car runs great and the smell shows up whenever i down shift which isnt too often and I always run on 91 octane (no higher in CA) usually chevron or shell.
Lean and Rich are two different things. A grounding kit is NOT worth your time. The individual coil pack design of the QR is very efficient as it is. A MSD igniton is pretty pointless for this application. The QR from the factory runs pretty rich as it is. You can install a SAFCII or Neo to adjust your AFRs. Either dyno tune or street tune. If you dont know what your doing as far as tuning goes then I would suggest that you'd get it dyno tuned. I see that you already know about the butterfly screw problem. You should also look into getting a header to get rid of the pre-cat which can break apart and cause oil consumption issues as wellas making your engine go boom.
 

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Discussion Starter #6
Lean and Rich are two different things. A grounding kit is NOT worth your time. The individual coil pack design of the QR is very efficient as it is. A MSD igniton is pretty pointless for this application. The QR from the factory runs pretty rich as it is. You can install a SAFCII or Neo to adjust your AFRs. Either dyno tune or street tune. If you dont know what your doing as far as tuning goes then I would suggest that you'd get it dyno tuned. I see that you already know about the butterfly screw problem. You should also look into getting a header to get rid of the pre-cat which can break apart and cause oil consumption issues as wellas making your engine go boom.
So...as far as running lean goes, would it be bad if left untreated? I mean its a smell which I am ok with since its not constant, but im just wondering if this is a bad thing for the car?

Also, yeah when i took the car to the dealer for the recalls they checked the pre-cat and it was still good. They reprogrammed the ECU and installed the heat shield around the cat. They said that should take care of the problem, was that bs? Lol. Also, I live in CA so if i install an aftermarket header it would suck when smog check time comes around.
 

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I'd take it for BS on what the dealer told you.

You can get a shorty header that only replaces the pre-cat and NOT the second cat. You'd have to relocate your second o2 sensor to after the second cat.

cheap, reliable shorty header (XS 4-1 BASIC header): XS Power Full Race and Basic Header & OBX 4-2-1 Header pkg o2 spacers - MSV

BTW, i doubt that you're running lean w/ only a CAI and exhaust. Our cars run stupid rich from the factory. Rotten egg smell is running rich
 

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Discussion Starter #8
I'd take it for BS on what the dealer told you.

You can get a shorty header that only replaces the pre-cat and NOT the second cat. You'd have to relocate your second o2 sensor to after the second cat.

cheap, reliable shorty header (XS 4-1 BASIC header): XS Power Full Race and Basic Header & OBX 4-2-1 Header pkg o2 spacers - MSV

BTW, i doubt that you're running lean w/ only a CAI and exhaust. Our cars run stupid rich from the factory. Rotten egg smell is running rich
Whats the life of the header? Mileage-wise?
 
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