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Old 06-09-2005, 09:34 PM   #1
WRXR1A10
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Default Tuna going bad?

somewhere above 5k afr spikes up to 19-20 then up to 25ish then all --.-. Usually in a 4th gear pull, not so often in a 3rd or lower pull. IDCs and fuel pressure are fine. MAF voltage is fine. Absolutely no det.

WB02 is orange red so it's not burnt out (yet), but can't accomplish free air cal due to temp unstable (no wind out of exhaust) both through laptop and stand alone.

If it's the sensor (which I'm suspecting) man that didn't last long for $200+!!!!

INPUTS?

Thanks,

SMUTTY
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Old 06-09-2005, 10:25 PM   #2
jalow72
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I have the same problem with mine. TurboXS told me that it is the sensor. I have not yet bought a new one to confirm that though. If you do get one soon, could you post the part #?
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Old 06-10-2005, 08:36 AM   #3
happasaiyan
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Quote:
Originally Posted by WRXR1A10
somewhere above 5k afr spikes up to 19-20 then up to 25ish then all --.-. Usually in a 4th gear pull, not so often in a 3rd or lower pull. IDCs and fuel pressure are fine. MAF voltage is fine. Absolutely no det.

WB02 is orange red so it's not burnt out (yet), but can't accomplish free air cal due to temp unstable (no wind out of exhaust) both through laptop and stand alone.

If it's the sensor (which I'm suspecting) man that didn't last long for $200+!!!!

INPUTS?

Thanks,

SMUTTY
its the sensor.

yes, they dont last long.

you can get the cheaper vw one for 90 or so i believe.
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Old 06-10-2005, 09:52 AM   #4
serendipity
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It's the sensor. The VW sensors are available cheap at VW dealerships - like $40 or so I think. But, if you bought the Bosch sensor with your Tuna, the harness will be a little different and you need to replace it with the same type of Bosch sensor. I believe you can get those cheap at some other dealership (Cadillac Catera used it or something?).

You may also be able to buy just the VW sensor harness from TXS and start using the VW sensors. IMO, the slightly more responsive bosch sensor isn't worth the extra cost of replacing them.
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Old 06-10-2005, 10:09 AM   #5
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mine hasn't worked since the day i got it. thats a big waste of money! how can you tell which sensor you have?
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Old 06-10-2005, 10:19 AM   #6
Jon [in CT]
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Quote:
Originally Posted by happasaiyan
its the sensor.

yes, they dont last long.

you can get the cheaper vw one for 90 or so i believe.
One can buy the VW sensor from 1stVWparts for $38.29 plus S&H. Go to https://www.parts.com/partlocator/in...&siteid=213799 and plug in the VW part number 021-906-262-B.

But, before you buy, you should read this thread:
http://forums.nasioc.com/forums/showthread.php?t=589469

The apparently high premature failure rate of these sensors with the Tuna raises the suspicion that the Tuna is driving them incorrectly. The VW part, at least, is designed to last a minimum of 3yrs / 50,000 miles.

Last edited by Jon [in CT]; 06-10-2005 at 10:24 AM.
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Old 06-10-2005, 10:25 AM   #7
serendipity
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The VW sensor has 6 pins, arranged in 2 rows of 3 pins, where one side of the connector is rounded and the other side is flat.

Is there really a high failure rate? How do you drive an O2 sensor incorrectly? It's just supplying a voltage. I'll bet that a lot of folks are putting the sensors too close to the turbo/heads and causing them to run too hot. The sensor must be somewhere that EGTs don't go above 700 degrees so that its heating element can keep it around 700 degrees.
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Old 06-10-2005, 10:49 AM   #8
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Quote:
Originally Posted by serendipity
Is there really a high failure rate? How do you drive an O2 sensor incorrectly? It's just supplying a voltage.
What you say is true for a 0-1V switching O2 sensor. It's not true for the Bosch planar wideband LSU4 A/F ratio sensor.

Is there really a high failure rate? There seem to be a lot of posts from Tuna users asking about bad sensors. Here are just two examples that describe the exact same failure symptoms as described in this thread:
http://forums.nasioc.com/forums/show...73&postcount=9
http://forums.nasioc.com/forums/show...ensor%22+tuner

Perhaps a poll, asking whether anyone with a TurboXS Tuner/Tuna/Tuner Pro has ever replaced their Bosch sensor, is in order.

Last edited by Jon [in CT]; 06-10-2005 at 10:55 AM.
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Old 06-10-2005, 11:07 AM   #9
attitude
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i would replace mine, but its too friggin expensive. im gonna order the VW harness today.
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Old 06-11-2005, 07:03 AM   #10
Kingpin
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Like the others said.. Its probably the sensor. You can try to simply clean it. Get a blow torch and gently burn the carbon buildup off the sensor. You have to be very carfull not to overheat it. Just slowly heat the sensor tip in very short bursts. You will see the buildup flash off. about 70% of the time the sensor will work perfectly again for a time period. I have been doing this for years and it works... Like I said.. Be carefull. You can damage the sensor very easy.

On Dynojet WB meters the Sensor is very far from the heat source as the gas is pumped to the sensor. As a result they clog alot. If your Sensor is midway or farther back this could be the problem as well. After cleaning you should get normal readings. If not toss it in the trash. I have two sensors for my LM1. Both still work and I have owned the unit nearly 2 years with almost daily use. Its been in hundreds of cars. The sensors can last a long time.



Clark
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Old 06-11-2005, 06:54 PM   #11
WRXR1A10
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Thanks for all the replies. Time for an attempted cleaning then find out what type then convert to VW if it isn't. It's mounted towards the bottom of the downpipe. Not so low that it will get damaged by road crap, but not right behind the turbo either. Software problems also though???? A known problem with a flash update TXS???? I haven't looked at my version or any available updates/fixes.

Man....so close to the drag strip. Just got the Forester STI tranny in (after 3 stockers) and now I can't tune it cause of this.

SOON....................soon

Again.....Thanks,



Smutty
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Old 08-31-2005, 05:31 PM   #12
DISCOPOPE
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looks like vw has recalled that sensor.
vw parts has blocked the part from any orders, even if you have a valid gti vin #

there is an audi equivilant, or so i've just been told.....
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Old 09-01-2005, 07:42 AM   #13
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Quote:
Originally Posted by DISCOPOPE
looks like vw has recalled that sensor.
vw parts has blocked the part from any orders, even if you have a valid gti vin #

there is an audi equivilant, or so i've just been told.....
^^^ interesting.

i've got the bosch, no problems with it. 15k miles so far.

did you orient your bung correctly? i use the oem rear o2 hole.
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Old 09-01-2005, 08:10 AM   #14
attitude
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i updated my firmware, and it works now.
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Old 09-01-2005, 10:21 AM   #15
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Quote:
Originally Posted by ride5000
^^^ interesting.

i've got the bosch, no problems with it. 15k miles so far.

did you orient your bung correctly? i use the oem rear o2 hole.
That's about when mine crapped out. I noticed the a/f ratio while cruising was rich and thought my front o2 sensor was going bad, but it was really my wbo2............

peace
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Old 09-01-2005, 06:03 PM   #16
DISCOPOPE
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i'm pulling it tonight, i'll do a free air and see if it helps.
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Old 09-03-2005, 10:00 AM   #17
NavyBlueSubaru
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I've got mine mounted in the rear-o2 plug on the downpipe/third cat. It is right before the catback. I dont have any problems with it yet and i've had it in there for quite a while, like almost 2 years i think.

Jeff
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Old 09-06-2005, 01:56 PM   #18
DISCOPOPE
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free air calibration results in "Er3"
looking to see who has them in stock right now.
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Old 09-14-2005, 08:17 PM   #19
ScoreBo
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Mine lasted about 6 months or 5000 miles mounted in the downpipe about 8 inches in front of the cat at the proper angle per the installation instructions. I am thinking about replacing it the a 1999 Cadillac Catera version 0258006065 from AutoZone for $99.99 which is supposedly the same sensor with a longer cable. To convert my Tuna Pro to the VW sensor will run around $250 (including the sensor). In hind sight, I think the LM-1 would be a better purchase than the Tuner Pro with the Bosch. According to it's documentation, it doesn't rely on the calibration resistor. However, the UTEC-to-Tuna integration sure is nice. IMHO, Tuna VW is the best choice for daily driven street cars.
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Old 09-14-2005, 08:29 PM   #20
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I've been using my Tuner pro for ~1.5 years with the bosch sensor. It is mounted 16" from the turbo outlet. I have had it in 3 different cars for a total of ~35k miles. Sometimes I will get a fre air cal failure, I just recal and it usally goes through fine sometimes it takes more than 1 or 2 tries.

TMS
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Old 09-15-2005, 03:23 PM   #21
serendipity
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Quote:
Originally Posted by ScoreBo
Mine lasted about 6 months or 5000 miles mounted in the downpipe about 8 inches in front of the cat at the proper angle per the installation instructions. I am thinking about replacing it the a 1999 Cadillac Catera version 0258006065 from AutoZone for $99.99 which is supposedly the same sensor with a longer cable. To convert my Tuna Pro to the VW sensor will run around $250 (including the sensor). In hind sight, I think the LM-1 would be a better purchase than the Tuner Pro with the Bosch. According to it's documentation, it doesn't rely on the calibration resistor. However, the UTEC-to-Tuna integration sure is nice. IMHO, Tuna VW is the best choice for daily driven street cars.
The cable is $99 and the VW sensor is only $69 from TXS:
http://www.turboxs.com/shop_prod.php?what_category=7
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