fR3ZNO
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« on: July 20, 2015, 12:17:50 PM »
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Hey everybody,
I have been trying to track down this issue I have been having. First, some details about the car.
-2004 B6 A4 1.8T 6MT
-APR Stage 1+ (KO3 and TT225 injectors)
-Forge DV
I have only had this car for about 4 months now and I have been getting a P0234 Overboost code as well a limp mode.
This is what I have done so far:
-replaced the N75
-unplugged N75 and drove to show that the wastegate was opening under spring pressure (wouldn't boost past 5 psi)
-replaced the leaky (leak was small) N75 hoses
-replaced the torn APR DV with a Forge DV
At this point, I was frustrated and under the advice from someone on Audizine, I unplugged the MAF to see if the car still went into limp mode. It did not. So I replaced the MAF. After a day or two, it went into limp mode again and logged the P0234 code.
I tried contacting APR multiple times and they were no help. I took logs according to their support page. The files are attached.
What is interesting is that the car did not go into limp mode during the pulls. I have yet to experience the limp mode during WOT. It seems to happen only during part throttle. Maybe it just needs an adaptation and/or cleaning?
If you guys have any suggestions, let me know. I am a loss right now and would really like to avoid bringing it to a shop...
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fR3ZNO
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« Reply #2 on: July 20, 2015, 12:27:51 PM »
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Interesting. Guess it makes sense since I have never seen boost go past 18psi. Thanks for the link, but I am still a bit of a noob, so what would be a reason for the car to go into limp mode? And why would it do that for an "underboost" is that supposed to protect the engine in some manner? |
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nyet
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« Reply #3 on: July 20, 2015, 12:29:19 PM »
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Interesting. Guess it makes sense since I have never seen boost go past 18psi.
Thanks for the link, but I am still a bit of a noob, so what would be a reason for the car to go into limp mode? And why would it do that for an "underboost" is that supposed to protect the engine in some manner?
It is there to protect the turbo in case there is a large boost or DV leak or some such and the turbo is being over taxed. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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nyet
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« Reply #4 on: July 20, 2015, 12:33:27 PM »
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Next step is to log block 111 (i THINK)
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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fR3ZNO
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« Reply #5 on: July 20, 2015, 12:34:17 PM »
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It is there to protect the turbo in case there is a large boost or DV leak or some such and the turbo is being over taxed. Okay. Thanks! I had already checked for boost leaks, but I guess it wouldn't hurt. |
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fR3ZNO
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« Reply #6 on: July 21, 2015, 05:06:35 AM »
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Next step is to log block 111 (i THINK)
Missed this yesterday. Any other blocks that I should log with 111? Also, is the N75 duty cycle normal in the other logs that I posted? |
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nyet
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« Reply #7 on: July 21, 2015, 11:01:21 AM »
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Missed this yesterday. Any other blocks that I should log with 111?
Also, is the N75 duty cycle normal in the other logs that I posted?
No, they're maxed out. which means 111 is likely maxed out. which means your wastegate isn't closing all the way, you have boost leaks, your inlet is collapsing, you have clogged cats, or your turbo is dying. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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nyet
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« Reply #8 on: July 21, 2015, 11:03:02 AM »
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-unplugged N75 and drove to show that the wastegate was opening under spring pressure (wouldn't boost past 5 psi)
If you have boost gauge you can disconnect the wg line and see what the turbo will do (CAREFULLY!) |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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fR3ZNO
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« Reply #9 on: July 21, 2015, 11:08:57 AM »
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No, they're maxed out.
which means 111 is likely maxed out.
which means your wastegate isn't closing all the way, you have boost leaks, your inlet is collapsing, you have clogged cats, or your turbo is dying.
I'm really hoping it's this. FWIW, the car has a crappy OE style cat that the PO put on. Maybe it's clogged again? Not sure.  Also I have a Forge TIP so I don't think it's collapsing. If you have boost gauge you can disconnect the wg line and see what the turbo will do (CAREFULLY!)
I do, that's how I could tell it wasn't boosting past 5 psi when the N75 was disconnected. I'll try that and report back. What am I looking for when I do this? With the wastegate line disconnected, wouldn't it act the same as if the N75 was disconnected, or would it force the wastegate closed? |
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adam-
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« Reply #10 on: July 22, 2015, 01:21:29 AM »
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With the wastgate line removed, it will remain shut and the turbo will spool until something brakes. Remember it's a K03s and will spool very quickly. Keep an eye on throttle pedal position and do a pull in third.
Watch for boost shooting over 20000000000psi.
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fR3ZNO
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« Reply #11 on: July 22, 2015, 06:46:14 AM »
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With the wastgate line removed, it will remain shut and the turbo will spool until something brakes. Remember it's a K03s and will spool very quickly. Keep an eye on throttle pedal position and do a pull in third. Okay, gotcha. Watch for boost shooting over 20000000000psi.  |
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fR3ZNO
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« Reply #12 on: July 22, 2015, 05:26:04 PM »
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Okay. So I took a quick spin with the WG line disconnected and it stopped boosting at around 18psi like normal... I did a few 3rd gear pulls and it never went past that. So idk. I'm going to do a log of block 111 in a few minutes.
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nyet
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« Reply #13 on: July 22, 2015, 05:31:39 PM »
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Okay. So I took a quick spin with the WG line disconnected and it stopped boosting at around 18psi like normal...
That isn't normal. With the wg line disconnected it should overboost like crazy. Also, I assume it didn't hold to redline either... |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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fR3ZNO
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« Reply #14 on: July 22, 2015, 05:55:31 PM »
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That isn't normal. With the wg line disconnected it should overboost like crazy.
Also, I assume it didn't hold to redline either...
I meant normal as in that's what it boosts to when the WG line is connected. It didn't build boost like I expected at all. It spiked at 18 and then tapered to about 14. So, no it didn't hold to redline. Does this mean the waste gate actuator is bad? Just for S&G I put the WG line back on and unplugged the N75. It didn't boost past 5 like usual, except it spiked at 10 and then tapered off. So, I don't know what the f-ck is happening. Waiting for the laptop to charge and I'll do a log of MB 111. |
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