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View Full Version : 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
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
Musical Coil Packs.

What does this mean?

walky_talky20
09-20-2010, 05:26 PM
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
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
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
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
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 (http://www.ecstuning.com/ES6928/?salesrep=PWinegardner&utm_source=audizine&utm_medium=forum&utm_content=PWinegardner&utm_campaign=postreply) 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/DerekBondo/Misc?authkey=Gv1sRgCPrOxMXXzLv6igE#552208843326038 8914

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
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
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
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
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
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!

Inval1d
12-18-2010, 06:59 PM
Ill put my money on the ECM causing him to misfire.

adr3naline fix
12-18-2010, 09:35 PM
To clarify, are you referring to the ECU or ICM....

AudiTurbo
12-19-2010, 08:57 AM
I have had the same problem for about a year now. Once I hit full boost it will buck around and hesitate until a little higher rpm and sometimes clears out. I have changed ever coil pack and it will run well for a while then it will go back to running bad. What could my problem be? Boost leak, O2, n75 or DV?
Please let me know if you find out whats wrong with yours cause it's prolly the same problem.

Mad Cow
12-19-2010, 11:58 AM
Why has almost nobody mentioned the MAP sensor code? For all you know that could be the problem. Also a bad O2 sensor won't cause your car to run much worse because there's a limit to how much the sensors' reading influences the AFR, and it's not giving the ECU bad readings because it gets disabled when the code appears.

AudiTurbo
12-19-2010, 01:11 PM
I don't have a map, but we have the same problem

Bondomination
12-19-2010, 06:14 PM
I have had the same problem for about a year now. Once I hit full boost it will buck around and hesitate until a little higher rpm and sometimes clears out. I have changed ever coil pack and it will run well for a while then it will go back to running bad. What could my problem be? Boost leak, O2, n75 or DV?
Please let me know if you find out whats wrong with yours cause it's prolly the same problem.So I read online somewhere that using an oiled K&N filter can cause your maf to foul up. I unplugged it earlier today and the car seemed to run much better and no bucking under boost. Didn't really drive it around too much, but I'm going to clean the sensor in the next day or so and see if that is the cure to my problem. If not, o2 sensor's next.

AudiTurbo
12-19-2010, 06:29 PM
Maybe that is wrong with mine, but mine would sometimes clear out at higher rpms. Mine kind of feels like it hit a wall when it gets to 15 psi

Bondomination
12-19-2010, 06:35 PM
Maybe that is wrong with mine, but mine would sometimes clear out at higher rpms. Mine kind of feels like it hit a wall when it gets to 15 psi
Mine does the same thing, hits the wall under full boost. When I'm driving up hills and full boost, the car bucks around.

AudiTurbo
12-19-2010, 06:48 PM
I have a k&n so maybe I should unplug my maf. I have changed plugs and coil pack so many times and it runs great for a week or so then goes back to the same problems

buck
12-20-2010, 05:29 AM
Bad 02 sensor readings can also mean MAF is going bad.

You'll need to log your MAF readings.

[;)]

AudiTurbo
12-20-2010, 11:28 AM
My car also back fires when I down shift! Does that sound like fuel?

Bondomination
12-21-2010, 11:21 AM
I have a k&n so maybe I should unplug my maf. I have changed plugs and coil pack so many times and it runs great for a week or so then goes back to the same problems

I unplugged my MAF and my ABS light came on and when I plugged it back in it turned back off. I wouldn't recommend driving around too much with the sensor unplugged. Although I will admit my car is much more fun to drive now when it unplugged.

audienthusiest
12-21-2010, 07:23 PM
im with whoever posted at the top of page two... check ur n75... do u have a race valve???or...? and maybe dv.. if ur issues are when ur under boost id start with ur boost system.. u said ur not runnin a map... so ur at stock boost (8psi ish) have u messed with the dv and n75? if ur car is higher mileage chances are thats where ur problem is... if u r stock... pm me i live in redmond.. i have an extra n75 and an extra dv... u are more than welcome to swap them in and see how they work... thats my 2 cents good luck

AudiTurbo
12-21-2010, 07:40 PM
Well I'm chipped! I have a race valve and a 007 dv. If I drive hard though the bucking and hesitation it will through a misfire code though