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Discussion Starter · #1 ·
Hi everybody!
I have a -00 New Beetle, 2.0, with 134tkm on the clock.

The car was purchased from the dealership 2013. I did my first oil+filter two months ago, and after this, the car has started to act up.

In short, I have:
-Low idle at cold startup. 850rpm.
-Stuttering idle, engine shakes.
-Bad gas mileage. Exhaust smells rotten.
-Bad acceleration, when in low rpms and fifth gear.
-Black carbon from exhaust on startup.
-No codes! No check engine light! Checked with an OBD2 meter, got nothing..

I just pulled the #1 sparkplug, and it looks like this:


At first I suspected vaccum lines, but I hear no hissing. This is what the fuel pressure regulator hose looks like:

Tried pinching some other hoses, but the engine still sounded like it missed.

I recorded a video, you can see some shaking in it. Also, low idle on startup.
New Beetle bad gas mileage problem - YouTube

What should I check next? I have new sparkplugs, but I guess they'll get fouled as soon as I put them in. It consumes so much fuel..

I have access to an identical New Beetle, so I can try to swap parts from car to car, but I have no idea what to swap..

Ideas?
 

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What brand and model scanner are you using; does it have live data capability (if you do what are the fuel trim levels)? If you can get access to a Volkswagen compatible scanner; It could really help you get some trouble codes that would enable you, to figure out what is going on.
A common problem with the 2.0 L; is a dirty throttle-body valve; cleaning it and then realigning it, can fix a lot of idle issues. Also a cracked and failing coil pack can cause problems, look for cracks or spray it with water to see if that affects how it runs. Other possibilities includes bad plug wires or fuel pump, you could check the fuel pressure with a testing tool, to see if it is within spec.

I would buy a basic VW compatible scan tool; look on Amazon.com for a VS450, it is under 50 bucks.
 

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Discussion Starter · #3 ·


Picked up one of these (Vgate Scan VS450), and according to the manual, you can do a readiness test for the emissions system.

Will report back in 24h with my findings, hoping this tool will do the trick :)
 

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Did this happen all at one time? I watched the video and there was a high pitched noise. Is that something that has just started happening or has it been going on for a while? I noticed that the gas was less than 1/8 of a tank, have you changed the fuel filter? It tends to trap water in it and when it gets over the centerline of the filter it can let water get into the engines fuel injectors. I bought my wife an '03 vert almost 2 years ago. It was doing a lot of what you are talking about. I changed the plugs and the wires, fuel and air filter, temp sensor and it brought it back to life. I also run premium gas and a bottle of Chevron Techron fuel system cleaner every third tank. The coil pack was in good shape so I didn't have to replace it. Word of caution is to use dielectric silicone on the wires at each end (plug and coil) to help keep water out and use anti seize on the threads of the plugs since they are going into an aluminum head.
 

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Discussion Starter · #6 ·
These are the codes, oldest first:

P0411 - Secondary Air Injector System, Incorrect Flow

P0300 - Random Cylinder Missfire

P0304 - Cyl 4 Missfire

P1300 - Missfire, Possible reason: Low Fuel

P0302 - Cyl 2 Missfire

P1128 - Fuel Trim, Bank 1 too lean

P0102 - MAF Signal too low (was probably due to me swapping them out)

I'll go put some fresh gas in the tank, reset codes, put new sparkplugs in, and do a readiness test.

Will report back soon, what do you guys think?
 

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Discussion Starter · #7 ·
Sparkplugs changed!

Did the readiness test;

Catalyst Fail
Heate Cat Pass
EVAP Sys Fail
Sec. Air. Sys. Fail

A/C Pass
O2Sensor Fail
Heated 02 Fail

EGR sys Pass

Ehm, what does all this mean?
 

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Since, you "cleared" the codes; all the rediness tests will usually be in "fail" mode; until the car is driven around and the computer checks all the components, whether they are working ok.

The readiness settings are going to take a bit of driving to go into the "pass" mode (of the two "pass/fail" readings).

you can read more about readiness codes and the process whereby the computers reset themselves here:

http://www.ross-tech.com/vcds/tour/readiness.html

More in depth info; about VW rediness process and how it works:

http://www1.snapon.com/Files/Diagnostics/UserManuals/VolkswagenAudiReadinessCodeCharts.pdf

http://wiki.ross-tech.com/wiki/index.php/16795/P0411/001041

http://wiki.ross-tech.com/wiki/index.php/16684/P0300/000768

http://wiki.ross-tech.com/wiki/index.php/16688/P0304/000772

P1300: vw tech: references coil failure in relation to the code:

http://www.obd-codes.com/forums/viewtopic.php?f=2&t=6476&view=next

http://wiki.ross-tech.com/wiki/index.php/16686/P0302/000770

http://wiki.ross-tech.com/wiki/index.php/17536/P1128/004392

read about fuel trim:

http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info

http://wiki.ross-tech.com/wiki/index.php/16486/P0102/000258

You can test your maf; just to make sure: good videos and check the link: "Part 1 -VW Mass Air Flow (MAF) Sensor Test (5 Wire Type)"

https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=vw jetta maf testing
 

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Discussion Starter · #9 ·
Thank you billymade! Excellent reading material. Will drive it around abit, and get to testing.


Did this happen all at one time? I watched the video and there was a high pitched noise. Is that something that has just started happening or has it been going on for a while? I noticed that the gas was less than 1/8 of a tank, have you changed the fuel filter? It tends to trap water in it and when it gets over the centerline of the filter it can let water get into the engines fuel injectors. I bought my wife an '03 vert almost 2 years ago. It was doing a lot of what you are talking about. I changed the plugs and the wires, fuel and air filter, temp sensor and it brought it back to life. I also run premium gas and a bottle of Chevron Techron fuel system cleaner every third tank. The coil pack was in good shape so I didn't have to replace it. Word of caution is to use dielectric silicone on the wires at each end (plug and coil) to help keep water out and use anti seize on the threads of the plugs since they are going into an aluminum head.
All happened very quickly (2-3weeks degeneration).

The high pitched noise is exactly the same on the second known working new beetle.

Good point about changing the fuel filter! Thinking it has never been done on this car..

I'll be back :)
 

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Discussion Starter · #10 ·
I think I've found the culprit here.

Went for a 60km drive, and when I got home, plugged in the scanner.

Readiness showed:

Catalyst Pass
Heate Cat Pass
EVAP Sys Fail
Sec. Air. Sys. Fail

A/C Pass
O2Sensor Pass
Heated 02 Pass
EGR sys Pass

And on the code side:

P0134 - Oxygen (Lambda) Sensor B1 S1: No activity

I think this is pretty self explaining, I need a new fron o2-sesnor :)
 

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To get the right to sensor; use the Bosch auto parts finder, make sure to confirm the right sensor, by using your engine code (make sure to get the "oem" version, NOT the universal):

http://www.boschautoparts.com/m/Pages/vehiclepartfinder.aspx

Before throwing parts of the problem; you might want to do some testing and check the wiring with a multimeter, check the manual below for more info

http://workshop-manuals.com/volkswa...ntrols_silicone_sealer/lubricant_precautions/
Sent from AutoGuide.com Free App
 

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Discussion Starter · #12 ·
You post great links!

Removed it beforehand, so i can take it with me to the partsstore tomorrow. It looked like this:



It was easy to remove with a 22mm open wrench. It was pitch black with carbon, most fell off, but there's still alot caked on it. It is toast! :p
 
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