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Guys I have questions about o2 sensors and rough idiling.

 
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Old 08-13-2009, 12:54 AM
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Guys I have questions about o2 sensors and rough idiling.

Couple buddies of myne and i have recently installed new headers, test pipe, and a catback exhaust on my 2000 prelude base; if it matters, i previously installed the aem v2 as well. Anyways, The new headers and the test pipe have the o2 sensors holes or w.e so we screwed them in. When we ran the car with the upgrades, the CEL of course went on. When we drove it, the car felt noticebly faster, but it idles very rough at 600-700 RPM. We assumed its because of the o2 sensors/ not having a cat. converter. Plus, when trying to remove the o2 sensors from the stock headers and cat. my buddy pierced the part of the o2 sensor with the holes thats actually in the pipe...we thought we were screwed for just that one, but no, the cel code stated that both sensors were messed up. So do i have rough idling bcause of that mess up or because there is not cat or did both of my senors for some damn reason went to hell? (Before we messed with the headers and exhaust my car was running well with no cel or any noticable problems..) So yeah i just cant find anything on the internet about actually fixing the problem besides getting new o2 sensors. The other possible solution is putting the cat back on, but yeah if anyone has any ideas just let me know please.
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Old 08-13-2009, 01:10 AM
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Re: Guys I have questions about o2 sensors and rough idiling.

throw on a hi-flo cat or stock cat, and then run a resistor for your o2 sensors to trick the ECU to cancel ya CEL's... heres the resistor link it worked on mine.. http://www.preludeonline.com/f60/con...around-148516/
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Old 08-13-2009, 01:56 AM
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Re: Guys I have questions about o2 sensors and rough idiling.

This will fix the idling as well? He doesnt say anything about that. Heres the thing, can i just throw the catalytic converter back on and will that fix the idling? and heres the other thing i havent done much research about this, but how restrictive is the cat compared to how much power im actually gaining from my upgrades. I havent dynoed or anything but with dyno charts from the parts i technically shud have gained about 20whp lol without the cat, with the cat i wonder what it wud be... neways if the cat can solve all this **** i might just throw it on..the CEL im not worried about as much as the idling. So yeah if the CEL is fixed does that mean rough idling is gone too?
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Old 08-13-2009, 09:52 AM
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Re: Guys I have questions about o2 sensors and rough idiling.

to smooth out ya idiling, check your IACV (Idle Air Control Valve) try cleaning it heres a how to on cleaning it properly...http://www.preludeonline.com/f91/how...h-idle-110161/
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Old 08-13-2009, 11:38 AM
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Re: Guys I have questions about o2 sensors and rough idiling.

Alright ill try this stuff. Thanks man
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Old 08-13-2009, 02:59 PM
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Re: Guys I have questions about o2 sensors and rough idiling.

No prob lemme know what goes down, more then likely its the IACV and run the resistor mod i told you to avoid CEL's for o2 sensors!! Goood Luck
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Old 08-13-2009, 04:16 PM
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Re: Guys I have questions about o2 sensors and rough idiling.

Alright so cleaning the IAC valve didnt help much. It was dirty and all, but it wasnt the cause of the rough idling because my car idled fine before i messed with the exhaust. I'm still suspecting that it is to do with the o2 sensors. Ill run the mod you told me about to trick the o2 sensors so that there wont be a CEL, but if i trick them to act normally you think that wud fix the idling. I mean the reason why i think they are affecting it is because the car idles at a lower RPM than before..it used to idle at about 900 rpm, and now its 600 or 700 rpm. so what do you think?
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Old 08-13-2009, 04:21 PM
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Re: Guys I have questions about o2 sensors and rough idiling.

These are the things that most often effect your idling.

IACV
FITV (This normally gives you a high rough idle)
AIR IN YOUR COOLANT (which you probably have, especially now that you cleaned your IACV)
EGR valve and/or ports
Primary O2 sensor

Try properly bleeding and refilling your coolant and see if that helps.

Also, go here and use the chart to help diagnose:
http://preludezone.com/showthread.ph...highlight=idle

Last edited by BadMofo; 08-13-2009 at 04:23 PM.
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Old 08-13-2009, 04:44 PM
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Re: Guys I have questions about o2 sensors and rough idiling.

ok so u said primerary o2 sensor. thats the pre-cat one? heres the thing i have a feeling we damaged it in the process of removing it so do you thats affecting my problem or is it the fact that i have no cat.
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Old 08-13-2009, 04:52 PM
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Re: Guys I have questions about o2 sensors and rough idiling.

Well... the pre cat one (primary) is the one that adjusts your air->fuel ratio... the post cat one (secondary) is the one that insures your cat is working...

So, with that said, the secondary one is probably throwing a code since you have no cat

The primary one is probably throwing a code because you damaged it (it wouldn't really make a difference if you had a cat or not for that one).

But, I don't think they are the cause of your idle issue, although they could be. Check that thread I directed you to... seriously. That thread will help you figure out the cause of your idle issues.

If you aren't gonna buy OEM ones (I wouldn't blame you, those ****ers are overpriced), get Denso's. They are good quality and very cheap, even for the direct fit ones.

Bosch's are known to throw codes almost immediately right out of the box, keep that in mind.
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Old 08-13-2009, 07:44 PM
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Re: Guys I have questions about o2 sensors and rough idiling.

for the ideling, take your v2 intake off, 4 screws, 2 at the throttle body, one connecting the filter, and one about 5 inches infront of the filter.....when you take it off (make sure engine is cold) spray bittermans 12 carb cleaner in the throttle body, that helped my hard idle

also clean your pcv valve from throttle body to your engine
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Old 08-14-2009, 01:12 AM
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Re: Guys I have questions about o2 sensors and rough idiling.

I will try few maintance tips that you guys gave me, but im assuming its the primerary o2 sensor causing the problem because i had no problems before i tempered with the exhaust system and especially the ****in o2 sensors. A friend of myne did mention it controlling the air-fuel ratio which im assuming might cause the car to idle at a lower rpm. The funny thing is the idle speed doesnt really flactuate like the troubleshooting forums mention, but he car just idles way to low. So yeah thanks a lot guys ill let you know how it goes.
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Old 08-21-2009, 01:41 AM
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Re: Guys I have questions about o2 sensors and rough idiling.

So if you guys are still paying attention, I installed my new denso o2 sensor and it made hell of a difference. The car idles fine now; its back to 800 rpm and it feels faster too. My friend mentioned that having the o2 sensor not functioning properly probably caused the system to revert to a safe setting for emissions, which may have robbed me of power... so again thanks for all your help.
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Old 08-27-2009, 03:45 PM
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Re: Guys I have questions about o2 sensors and rough idiling.

=) Glad to help... told you the denso was cheap and good! Did you get the direct fit one or the universal one (the one with the harness or the one that you have to splice)?

I do accept rep donations =).
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catalytic, exhaust, o2 sensor, rough idle, test pipe


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