No CEL, Limp Mode?

timneedscoffee10 · Apr 16, 2013

So I was driving home this afternoon, and got on the gas hard a couple times. I did a hard pull through 2nd and into 3rd, causing the clutch to slip. Everything was fine, and I carried on cruising at about 55-60 for another 15 miles, and then when I got back into some speed zones and slowed down - I realized I wasn't getting any boost at all. It was as if I were suddenly driving in valet mode.

Didn't throw a CEL, and haven't gone to scan for soft-codes yet. I pulled off the road, turned off the engine, and then started up and everything was normal again.

Will the ECU pick up on the clutch slip and throw me into limp mode? (2 more weeks until my southbend install!)

mkvince · Apr 16, 2013

hpfp? i didn't get a cel initially when my fp went out and the car was in limp mode...

timneedscoffee10 · Apr 16, 2013

MKVInce said:
hpfp? i didn't get a cel initially when my fp went out and the car was in limp mode...

Would an hpfp issue be intermittent like that? no experience there, will have to do some searching.

mkvince · Apr 16, 2013

^ you're right...i misread the part when you said it went back to normal again.

timneedscoffee10 · Apr 16, 2013

Welp, I have misfires on Cyl3 and Cyl4, and also a P0234 Overboost code. I'm running R8 coils, and installed new plugs yesterday.

Will reset codes and keep an eye on it. Hopefully this is related to the clutch slip, resulting in the engine revving and the k04 having to dump. If anyone has any thoughts, let me know, though - I'm doing all the requisite searching and reading about the bum N75 and DV valves.

timneedscoffee10 · Apr 16, 2013

Here's the scan incase it rings a bell for anyone while I continue searching

Code:

Address 01: Engine (CCT)       Labels: 06J-906-026-CCT.clb
   Part No SW: 1K0 907 115 AP    HW: 1K0 907 115 AA
   Component: 2.0l R4/4V TFSI     0020  
   Revision: AAH18---    Serial number:               
   Coding: 0403010A18070160
   Shop #: WSC 01357 011 00200
   VCID: 74ED2CA617D916B8354

4 Faults Found:
000768 - Random/Multiple Cylinder Misfire Detected 
               P0300 - 000 -  - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 0
                    Fault Frequency: 1
                    Mileage: 81107 km
                    Time Indication: 0
                    Date: 2029.14.27
                    Time: 14:24:10

             Freeze Frame:
                    RPM: 2051 /min
                    Load: 13.3 %
                    Speed: 0.0 km/h
                    Temperature: 7.0∞C
                    Temperature: 6.0∞C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.605 V

000771 - Cylinder 3 
               P0303 - 000 - Misfire Detected - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 0
                    Fault Frequency: 1
                    Mileage: 81107 km
                    Time Indication: 0
                    Date: 2029.14.27
                    Time: 14:24:20

             Freeze Frame:
                    RPM: 858 /min
                    Load: 25.5 %
                    Speed: 0.0 km/h
                    Temperature: 10.0∞C
                    Temperature: 6.0∞C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.605 V

000772 - Cylinder 4 
               P0304 - 000 - Misfire Detected - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 0
                    Fault Frequency: 1
                    Mileage: 81107 km
                    Time Indication: 0
                    Date: 2029.14.27
                    Time: 14:24:20

             Freeze Frame:
                    RPM: 858 /min
                    Load: 25.5 %
                    Speed: 0.0 km/h
                    Temperature: 10.0∞C
                    Temperature: 6.0∞C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.605 V

000564 - Boost Pressure Regulation 
               P0234 - 000 - Limit Exceeded (Overboost Condition)
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 0
                    Fault Frequency: 1
                    Mileage: 81537 km
                    Time Indication: 0
                    Date: 2030.14.00
                    Time: 14:49:21

             Freeze Frame:
                    RPM: 4976 /min
                    Load: 6.3 %
                    Speed: 102.0 km/h
                    Temperature: 95.0∞C
                    Temperature: 21.0∞C
                    Absolute Pres.: 990.0 mbar
                    Voltage: 14.224 V

Readiness: 0010 0001

PRND[S] · Apr 16, 2013

The overboost could be a result of the misfire. Which spark plugs did you put in, and how are they gapped?

timneedscoffee10 · Apr 16, 2013

I installed NGK PFR7B, gapped to 0.028" from the factory. As soon as I find my blade-style gap tool, I can pull them and recheck. (my ring is chewed up and horribly inaccurate)

Looking at the scan, the misfires happened at idle (858 RPMs, 0.0 km/h) at 2:24:20pm; the overboost happened over 25 minutes later at cruising speed (102 km/h == 63 mph), and low load (6.3%), but relatively high RPMs (4976 RPMs)... so I must have downshifted, which I only ever do at that speed when approaching a speed-zone, so I would have attempted to rev-match, but would not have been accelerating.

Maybe tomorrow I'll shuffle my coils around (swap 1 and 2 with 3 and 4) and recheck my plugs.

No CEL, Limp Mode?

timneedscoffee10

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PRND[S]

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