P0302 cylinder two misfire

Tiny
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Today that hose has been fixed, and this time i've been to another serviceman. I'm adding the image of the old hose, its awkward its fixed in 3 places. So back to the problem, while the other guy said both of the O2 sensors are allright, this serviceman noticed the first O2 sensor might be faulty, because its value is oscillating around 0.43V and 0.48V meanwhile the second has the good values, moving between 0.1V and 0.9V. I've seen on internet, when the mixture is good, its on 0.45V, and going up/down correcting the mixture. I would ask it, is it really faulty? While he tested it, he got the System too lean (Bank 1) fault code aswell. Can this be the cause of the relatively high idle consumption aswell?
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Wednesday, March 8th, 2017 AT 6:52 AM
Tiny
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If the o2 sensor not moving much is sensor two the down stream one by the cat?That would be normal at idle and when you raised the rpms up to about 2000 then the o2 sensor would start moving. That o2 sensor is to read the health of the cat.I would have a smoke test performed on the vacuum system you probably still have a vacuum leak.
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Wednesday, March 8th, 2017 AT 12:51 PM
Tiny
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The second one was moving ok. The first one has only low amount moves between 0.43 and 0.48, even when we raised the rpm to 3-4k. So you are saying that the first o2 sensor with this move is ok, its not faulty?
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Wednesday, March 8th, 2017 AT 1:05 PM
Tiny
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I've found no one who can perform a smoke test. I don't know, this country is fucked (Hungary), atleast the car mechanic part of it.
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Wednesday, March 8th, 2017 AT 1:06 PM
Tiny
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That's electrical tap on the hose is not a good fix for the vacuum leak I didn't look at the picture before my last reply your probably best just replacing that hose you can probably find one on eBay. Also the readings not moving sounds like your talking about the sensor down by the cat. Unplug the top sensor and see how that effects the readings?Because it makes a lot more sense that one not moving much is the bottom one.
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Wednesday, March 8th, 2017 AT 1:12 PM
Tiny
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That hose (which I added the image about) was changed with a new one, but i've seen something interesting yesterday, the short and long fuel trims (Image attached). By the way i've already ordered the Bank1 O2 sensor, I got it for only 28 dollars, for a try to fix the problem its not a big investment (compared to injectors and EGR valve). Its possible I have a bad O2 sensor, AND still atleast one more vacuum leak? Also i've seen on the internet, an absolutely dirty air filter also can cause the rough idle stuff, tomorrow i'm going to check it aswell (as far as I know it hadnt been checked when we bought the car, half year ago).
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Thursday, March 9th, 2017 AT 1:03 PM
Tiny
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Or the o2 sensor is just picking up the lean condition and reading lean.
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Thursday, March 9th, 2017 AT 1:28 PM
Tiny
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The first picture is the cable of the current bank1 o2 sensor, the second the pipe from the plastic label, air filter. I hear a hissing sound, probably from that pipe, that can effect the air-fuel ratio? I will try taping it, to see if it makes the temporary fix.
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Friday, March 10th, 2017 AT 1:06 AM
Tiny
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Again any un metered air/vacuum leak will set a lean code and can effect the way it runs. Taping the hose isn't the way to fix it.
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Friday, March 10th, 2017 AT 7:07 AM
Tiny
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I've seen on the internet I can do a smoke test with cigar/vape. I'd ask it, which hose should I blow into? Also I installed the other O2 sensor (on the picture the left one is the old one), I got good values with it in voltage, also the short and long term fuel trims are good, but the exhaust is still sputtering, and the idle is relatively rough, but feels a bit better now. Does it have an adaption time? I've heard something like that it has to adapt to the new sensor.
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Saturday, March 11th, 2017 AT 6:16 AM
Tiny
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No it should start working right away the new sensor. As far as the cigar deal tried that in a pinch I didn't like the results.I made a smoke machine with a old metal paint sprayer GM glow plug some miles hoses fish pump wires fuse etc and some unscented mineral oil. It works great.
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Saturday, March 11th, 2017 AT 1:09 PM
Tiny
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Not miles ment nipples
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Saturday, March 11th, 2017 AT 1:18 PM
Tiny
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We've been looking for vacuum leaks with Carb cleaner (with engine on), and there is no more leak, even the tube which i've posted a picture about, is not leaking. With the O2 sensor, I got better short and long term fuel trims, but now I got a double code for misfire, and the engine is constantly misfireing, I can hear the sputter on the exhaust. Im absolutely lost right now, what the hack it could be.
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Sunday, March 12th, 2017 AT 12:35 PM
Tiny
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Can you swap the number two spark plug and coil with the number 3 spark plug and coil?To see if the misfire moves?
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Sunday, March 12th, 2017 AT 6:24 PM
Tiny
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We already tried that, few weeks ago. Only ignition coils swap, but misfire remained in cylinder 2.
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Sunday, March 12th, 2017 AT 10:28 PM
Tiny
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Does it only missifire at idle constantly or when you rub it to as well?
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Sunday, March 12th, 2017 AT 10:40 PM
Tiny
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I can feel it only at idle, it got no loss of power while driving.
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Sunday, March 12th, 2017 AT 10:44 PM
Tiny
KEN L
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Lets see if you have low compression on #2 here is a guide that will help you

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run this test and get back to us so we can continue helping you.

Best, Ken
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Wednesday, March 15th, 2017 AT 12:41 PM
Tiny
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I dont know the exact numbers of the pressures on the cylinders, but I know it was tested, I think in january, and the serviceman said its good on each cylinder.
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Wednesday, March 15th, 2017 AT 12:53 PM
Tiny
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It would be nice to know the exact readings. So now we're back to a vacuum leak that can cause a miss at idle but not at higher rpms.
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Wednesday, March 15th, 2017 AT 12:59 PM

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