O2 sensor failing?
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From: CO
O2 sensor failing?
Since swapping my stock h22 back in, I have had a goofy issue. When the car is cold, it idles and drives fine, but once fully warmed up to temp, it is very sluggish at low rpm, and will drop revs to the point of stalling, if driven and then stopped, and is very sluggish to pick up rpm when the throttle is opened. I am not getting any check engine lights, but my ghetto a/f gauge acts wierd as well.
I had to make a new gasket for my header, and I used some crap from a local shop, that had rubber in it, and smelled horrible as it heated up, and I think may have clogged the sensor as well.
Does this sound possible, that the sensor is ok according to the ecu, just starting to fail, or getting an inaccurate reading due to buildup?
Hopefully going to grab one after work today, but trying to get ideas if I am on the right path here.
Oh, and for any extra info the engine is a JDM H22, P13 ecu, EGR deleted, FITV deleted, IACV freshly cleaned, stock injectors in STR fuel rail, walbro fuel pump.
Oh and yay for 1000 posts, 8 years after signing up.
I had to make a new gasket for my header, and I used some crap from a local shop, that had rubber in it, and smelled horrible as it heated up, and I think may have clogged the sensor as well.
Does this sound possible, that the sensor is ok according to the ecu, just starting to fail, or getting an inaccurate reading due to buildup?
Hopefully going to grab one after work today, but trying to get ideas if I am on the right path here.
Oh, and for any extra info the engine is a JDM H22, P13 ecu, EGR deleted, FITV deleted, IACV freshly cleaned, stock injectors in STR fuel rail, walbro fuel pump.
Oh and yay for 1000 posts, 8 years after signing up.
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Re: O2 sensor failing?
What is the wide band reading during these events?
A good A/B test might be to disconnect the O2 sensor and drive around open loop for a bit and see if the problem goes away. Have you done anything else recently other than make a new header gasket and clean the IACV?
A good A/B test might be to disconnect the O2 sensor and drive around open loop for a bit and see if the problem goes away. Have you done anything else recently other than make a new header gasket and clean the IACV?
Thread Starter
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Joined: Dec 2004
Posts: 3,351
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From: CO
Re: O2 sensor failing?
That is a possibility, but I was planning to just grab anew sensor tonight anyways.
I had my other engine in the car all summer, and pulled it and put this one back in, and had the problem the day I got it going.
I had my other engine in the car all summer, and pulled it and put this one back in, and had the problem the day I got it going.
Thread Starter
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Joined: Dec 2004
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From: CO
Re: O2 sensor failing?
Sooo, the O2 was fine, after pulling it out and checking.
But, after messing around a bit more, I finally tracked it down, and it just showed me why me and the wife call my Prelude "The Princess".
Two solder points had worn through the heat shrink on my Boomslang harness, and must have been making contact with something metal. In specific, the D21 and D22 pins, which are grounds for the TPS and MAP. Disconnecting that and running the ecu stock, and no issues. Fixed the harness, messed with it a bit and couldn't get the problem to come back.
But, after messing around a bit more, I finally tracked it down, and it just showed me why me and the wife call my Prelude "The Princess".
Two solder points had worn through the heat shrink on my Boomslang harness, and must have been making contact with something metal. In specific, the D21 and D22 pins, which are grounds for the TPS and MAP. Disconnecting that and running the ecu stock, and no issues. Fixed the harness, messed with it a bit and couldn't get the problem to come back.
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