Just inherited 1.8t, problems under boost

**Baseballer** · 09-20-2010 05:03 PM

Hey guys,

I'm driving my brother's 01 1.8t since he is gone off to school. It seems like ever since he got it, however, there has been a problem with it under boost. Almost as soon as the car hits boost, it hesitates and lags almost like a boost leak. It bucks between shifts too. But, the boost gauge shows that boost is holding plenty steady. I just checked the plugs, and they are all working. A friend of mine suggested that the fuel filter may need to be replaced, but the tailpipes are very black and sooty, which in my experience would mean that there is too much fuel, suggesting then that the filter may not be the problem.

It's been a few years since I've been in the turbo game, so my thinking and problem solving is a bit rusty. Thanks for all your helps and advice.

**adr3naline fix** · 09-20-2010 05:06 PM

Musical Coil Packs.

**walky_talky20** · 09-20-2010 05:11 PM

Here's what I'd do to start:

- Check for codes with vag-com
- Check fuel trims
- Log the MAF and boost
- Boost leak test

If you can do any or all of those items, you'll be closer to finding your problem. If you can't, then you should find a shop that can.

**Baseballer** · 09-20-2010 05:18 PM

Originally Posted by walky_talky20

Here's what I'd do to start:

- Check for codes with vag-com
- Check fuel trims
- Log the MAF and boost
- Boost leak test

If you can do any or all of those items, you'll be closer to finding your problem. If you can't, then you should find a shop that can.

Haha, all I can do is the boost leak test. But wouldn't my boost gauge tell me if there was a problem?

**Baseballer** · 09-20-2010 05:19 PM

Originally Posted by adr3naline fix

Musical Coil Packs.

What does this mean?

**walky_talky20** · 09-20-2010 05:26 PM

Originally Posted by Baseballer

What does this mean?

Adrenaline is wagering that your "hesitation" problem is really a misfire that is caused by a bad coil pack (aka ignition coil). If you have the ability to scan for codes, you can swap the coil packs around to see if the problem follows the coil pack. If it does, you've identified the bad one.

Actually, if you have the ability to scan for codes at all, and you have a misfire code you can go directly to your nearest Audi dealer. There is an open recall on all 2001+ Audis for replacement ignition coils. So you can get 4 new ones for free (if they haven't been replaced yet under the recall).

So, if the car hasn't had the recall done on it yet, just do that first to rule out the coil packs.

**adr3naline fix** · 09-20-2010 05:27 PM

Get one new coil pack from Orielly Auto Parts. $26.95. Then swap it for one coil pack of choice. See if problem persists. If it does, switch it out for the next, test again....repeat until you have found what coil pack needs to be replaced. 99% of these threads end in result of playing "Musical Chairs" with your coil packs! And if somehow it's NOT a coil pack, you'll need that coil pack sometime in the short future due to a shitty design from the factory (which was later under voluntary recall)

edit: Some of my post was beat to the punch by mr walky talky - whom I believe helped me out when I first discovered the coil pack problem.

**Sour** · 09-20-2010 05:30 PM

Originally Posted by Baseballer

What does this mean?

coil packs go all the time on audi's it may be one or even all (kidding hopefully) take a look

I would guess the b5 a4 has an ob2 go to advanced auto or something similar they have a handheld they will let you borrow and you can get your fault codes then google them or post them here an that could/should give you your problem

**Baseballer** · 09-20-2010 05:37 PM

All four packs were replaced last December under the recall. My brother has all the code scans in an e-mail--he'll send them to me later.

I know one of the o2 sensors is bad, could that be it?

**walky_talky20** · 09-20-2010 05:39 PM

Originally Posted by Baseballer

All four packs were replaced last December under the recall. My brother has all the code scans in an e-mail--he'll send them to me later.

I know one of the o2 sensors is bad, could that be it?

Depends. If it is just the heater circuit that's bad, probably not. Get us the codes and we'll go from there.

**Baseballer** · 09-20-2010 05:43 PM

Cool, thanks for the help guys. I told my brother to get on here and he would probably have it figured out in a day. I just want to call him and say "OMG UR CARZSOFASTNOW LOLOLOL TOO BAD YOU DON'T HAVE IT"

**Baseballer** · 09-20-2010 06:18 PM

Well I just put the plugs back in and reconnected the coils--seems to have alleviated the symptoms, but probably not completely. Odd.

**Baseballer** · 09-20-2010 06:23 PM

Here is the scan:

Monday,28,June,2010,18:19:24:60046
VCDS Version: Release 908.2
Data version: 20100326

************************************************** ******************************
************************************************** ******************************

Address 35: Centr. Locks Labels: 8D0-862-257.lbl
Control Module Part Number: 8L0 862 257 N
Component and/or Version: CV-Pump D11
Software Coding: 16140
Work Shop Code: WSC 06435
8 Faults Found:

01367 - Central Locking Pump Run Time Exceeded (Likely Leak)
35-00 - -
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01369 - Alarm triggered by Hood Switch
35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
35-00 - -
00991 - Interior Lights
28-00 - Short to Plus
00955 - Key 1
09-00 - Adaptation Limit Surpassed

Monday,28,June,2010,18:24:12:60046
VCDS Version: Release 908.2

Address 17: Instruments Labels: 8D0-920-xxx-17.lbl
Control Module Part Number: 8D0 920 980 Q
Component and/or Version: B5-KOMBIINSTR. VDO D06
Software Coding: 02242
Work Shop Code: WSC 23320
3 Faults Found:

00771 - Fuel Level Sensor (G)
30-10 - Open or Short to Plus - Intermittent
01314 - Engine Control Module
49-10 - No Communications - Intermittent
00668 - Supply Voltage Terminal 30
53-10 - Supply Voltage Too Low - Intermittent

VCDS Version: Release 908.2
Data version: 20100326

Monday,28,June,2010,18:33:57:60046

Chassis Type: 8D - Audi A4 B5
Scan: 01 02 03 08 15 16 17 25 35 37 45 55 56 57 67 75 76 77

************************************************** ****************************-
Address 01: Engine Labels: None
Part No: 4B0 906 018 M
Component: 1.8L R4/5VT G 0003
Coding: 16701
Shop #: WSC 78136

5 Faults Found:
16826 - EVAP Emission Control Sys: Small Leak
P0442 - 35-10 - - - Intermittent
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-10 - - - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
16490 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal
P0106 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
Readiness: 0000 0000

************************************************** ****************************-
Address 03: ABS Brakes Labels: 8D0-907-389.lbl
Part No: 8D0 907 389 E
Component: ABS/ESP allrad D36
Coding: 04275
Shop #: WSC 06435

No fault code found.

************************************************** ****************************-
Address 08: Auto HVAC Labels: 8D0-820-043-1D.lbl
Part No: 8D0 820 043 P
Component: A4 KLIMAAUTOMAT D57
Coding: 00140
Shop #: WSC 06435

No fault code found.

************************************************** ****************************-
Address 15: Airbags Labels: 8D0-959-655-AI8.lbl
Part No: 8D0 959 655 G
Component: Airbag Front+Kopf 1002
Coding: 00304
Shop #: WSC 06435

No fault code found.

************************************************** ****************************-
Address 17: Instruments Labels: 8D0-920-xxx-17.lbl
Part No: 8D0 920 980 Q
Component: B5-KOMBIINSTR. VDO D06
Coding: 02242
Shop #: WSC 23320

No fault code found.

************************************************** ****************************-
Address 35: Centr. Locks Labels: 8D0-862-257.lbl
Part No: 8L0 862 257 N
Component: CV-Pump D11
Coding: 16232
Shop #: WSC 06435

No fault code found.

************************************************** ****************************-
Address 45: Inter. Monitor Labels: 4B0-951-173.lbl
Part No: 4B0 951 173
Component: Innenraumueberw. D03
Coding: 00101
Shop #: WSC 06435

1 Fault Found:
01382 - Alarm triggered by Anti-Theft Sensor; Front Left
35-00 - -

************************************************** ****************************-
Address 55: Xenon Range Labels: 4B0-907-357-AUT.lbl
Part No: 4B0 907 357
Component: LEUCHTWEITEREGLER D004
Coding: 00012
Shop #: WSC 06435

No fault code found.

************************************************** ****************************-
Address 56: Radio Labels: 8D0-035-1xx-56.lbl
Part No: 8D0 035 195 A
Component: Radio D00
Coding: 00114
Shop #: WSC 06435

No fault code found.

End ************************************************** ******************-

**Euromike** · 09-20-2010 07:16 PM

16826 - EVAP Emission Control Sys: Small Leak
P0442 - 35-10 - - - Intermittent
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-10 - - - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
16490 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal
P0106 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent

engine codes.

**Baseballer** · 09-20-2010 07:18 PM

Originally Posted by SantorianA4

16826 - EVAP Emission Control Sys: Small Leak
P0442 - 35-10 - - - Intermittent
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-10 - - - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
16490 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal
P0106 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent

engine codes.

???

**Baseballer** · 09-20-2010 07:19 PM

Originally Posted by SantorianA4

16826 - EVAP Emission Control Sys: Small Leak
P0442 - 35-10 - - - Intermittent
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-10 - - - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
16490 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal
P0106 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent

engine codes.

???

**marknad113** · 09-21-2010 06:31 AM

^^he means those are the only important codes for this discussion

**pattshreds** · 09-21-2010 08:35 AM

if it happens again check for a misfire. i had this same issue a while ago.

**ECS Tuning-Audi** · 09-21-2010 02:29 PM

It's good news your misfire has been temporarily alleviated. If you do encounter this problem again, it is good to note you can use a laptop and a diagnostic cable such as this USB cable to read your codes as they arise in conjunction with the VCDS Lite software. Hopefully this gremlin will not show it's ugly head again.

**Baseballer** · 09-28-2010 03:06 PM

Well, changed the plugs, and as the same as when I just checked the old ones and put them back in, the cars runs great now. I guess only time will tell if it's a permanent fix. These are the old plugs, they don't even look that bad do they?

http://picasaweb.google.com/DerekBon...88433260388914

**walky_talky20** · 09-28-2010 05:40 PM

No the ends there look good. Good chocolate brown color as well. One of them could have had a grease trail up the side of the porcelain, though. That would cause misfires. Your hand is completely covering the porcelain, so I cannot say.

**Baseballer** · 10-02-2010 11:53 PM

So it was only about ten miles worth of driving before the car started running crappy again. So to recap:

1. Checked old plugs, put them back in, car ran great
2. Car started hesitating under boost within 10-15 miles worth of driving
3. Changed plugs
4. Can ran great
5. Repeat step 2

WTF could this possibly be? Did anybody see anything on the engine scans? I'm fairly sure one of the O2 sensors needs to be replaced, but again, what's the deal with the plugs?

**Baseballer** · 10-03-2010 08:37 PM

bizzump

**lotusgardener** · 10-03-2010 09:21 PM

You need the rear O2 sensor replaced, but that's only emissions crap, you'll get an MPG or two better mileage.

It definitely looks like a coilpack. Do what someone else said, and hit up O'Rielly's and get a new coilpack. I had a truck that had a misfire. I replaced the one coilpack and another cyclinder began misfiring. One solution always leads to another problem.

Where in Seattle you located?

**Baseballer** · 10-03-2010 09:55 PM

But they were all replaced last December! I'm in Bellevue.

**Baseballer** · 10-05-2010 11:57 AM

Are any of these codes something to be worried about?

16826 - EVAP Emission Control Sys: Small Leak
P0442 - 35-10 - - - Intermittent
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-10 - - - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
16490 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal
P0106 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent

**ADNpro** · 10-05-2010 12:08 PM

You could also try cleaning your MAF. Probably not the problem, but wouldn't hurt either.

**Baseballer** · 10-05-2010 12:19 PM

I also forgot to mention that I've noticed the ESP light flashing under WOT sometimes. Searching online shows people having the same issue but perhaps for different reasons.

I just don't understand how a coil pack could go bad again so quickly after they had all be replaced. Kinda disturbing...

**Nateness** · 10-05-2010 12:34 PM

That manifold pressure sensor code seems pretty suspicious to me.

Could there be an issue with the MAP sensor rather than the MAF? If the MAP sensor is faulty, that could absolutely ruin the drivability of the car.

Is your issue consistent off-boost or do the symptoms mainly show up when boost pressure builds?

**Baseballer** · 10-05-2010 01:32 PM

Originally Posted by Nateness

That manifold pressure sensor code seems pretty suspicious to me.

Could there be an issue with the MAP sensor rather than the MAF? If the MAP sensor is faulty, that could absolutely ruin the drivability of the car.

Is your issue consistent off-boost or do the symptoms mainly show up when boost pressure builds?

The issue seems to really only be under boost. The turbo will build and hold boost no problem, but the car will kinda buck in and out of power. I don't know if you've read the whole thread, but there is quite a bit of soot built up on the tailpipes.

**Baseballer** · 10-13-2010 11:31 PM

Well I went to play Musical Coil Packs and now the car is running on three cylinders after trying to switch out just the first coil pack. I think I may have effed up the wires and/or the connector that connects to the coil pack. I pulled back the grommet and one of the four wires had come out. Can I just try to jam it back in there, or do I need to get a new wire.

Also wondering what other people think of the MAP sensor idea...

**Bondomination** · 12-13-2010 12:08 PM

bump (interested in a fix too)

**adr3naline fix** · 12-13-2010 03:56 PM

Misfire under boost = spark plugs. How come no one has mentioned the importance of spark plug gap? .028. Also, what plugs are you running?

Also, 17522 is a bad O2 code.

**Corrado_Guy** · 12-13-2010 07:57 PM

Originally Posted by adr3naline fix

Misfire under boost = spark plugs. How come no one has mentioned the importance of spark plug gap? .028. Also, what plugs are you running?

Also, 17522 is a bad O2 code.

It was mentioned above a number of times and new plugs didn't do the trick, there is even a link to the old plugs above.

**adr3naline fix** · 12-15-2010 10:07 AM

Originally Posted by Corrado_Guy

It was mentioned above a number of times and new plugs didn't do the trick, there is even a link to the old plugs above.

No where in any of the above post was the importance of Plug Gapping stated or inquired. I've seen quite a few threads end in "I regapped my plugs to .0XX and the car doesn't miss anymore..."

I doubt the OP gapped them wrong, but always a question to start with.

**buck** · 12-15-2010 11:53 AM

Bad 02 sensor readings can also mean MAF is going bad.

You'll need to log your MAF readings.

**Bondomination** · 12-18-2010 06:33 AM

Originally Posted by adr3naline fix

No where in any of the above post was the importance of Plug Gapping stated or inquired. I've seen quite a few threads end in "I regapped my plugs to .0XX and the car doesn't miss anymore..."

I doubt the OP gapped them wrong, but always a question to start with.

The car that the OP inherited is my car that I now have back and I am still trying to figure this problem out. I have some Bosch NGK BKR6E plug that I gapped to .028". Car ran great for 10 miles again before it started acting up again so now I'm back to square 1. I've heard somewhere else that it could be a bad o2 sensor thats causing the issue. Can anyone confirm that a bad O2 sensor would possibly cause the bucking under boost? I'm going to replace it next anyway, but I'm just curious.

**adr3naline fix** · 12-18-2010 11:01 AM

Originally Posted by Bondomination

The car that the OP inherited is my car that I now have back and I am still trying to figure this problem out. I have some Bosch NGK BKR6E plug that I gapped to .028". Car ran great for 10 miles again before it started acting up again so now I'm back to square 1. I've heard somewhere else that it could be a bad o2 sensor thats causing the issue. Can anyone confirm that a bad O2 sensor would possibly cause the bucking under boost? I'm going to replace it next anyway, but I'm just curious.

I run the same plugs / gap. Weird that it only worked for 10mi. It seems like everything else was tried - so post up your results after the new O2!