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1.8t B5 engine lobes and idles erratically

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1.8t B5 engine lobes and idles erratically

  #1  
Old 12-07-2007, 07:00 PM
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Default 1.8t B5 engine lobes and idles erratically

These are my codes. Can anyone give me suggestions on what needs to be replaced. I reset the codes with my vagcom but it still is the same.



17967.P1559 Throttle valve control part-J338: Fault in basic settings
[/align]17965.P1557 Turbo/super charger over boost condition: control limit exceeded[/align][/align]17544.P1136 Bank 1 Mixture adaptation (add): System too lean[/align][/align]17884.P1476 EVAP emission control leak detection pump (LDP)circuit: [/align][/align] malfunction / vacuum too low[/align]
 
  #2  
Old 12-07-2007, 07:39 PM
ImTheDevil's Avatar
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Location: Binghamton, NY
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Default RE: 1.8t B5 engine lobes and idles erratically

Just taking a stab in the dark here (I have a 30V so I won't see some of these codes) - for the throttle valve control fault, I don't know if you have a drive-by-wire (DBW) car or not, but if you do, you could try the throttle body adjustment (just turn the car on to the full electrical power position, right before you'd crank the engine), and listen for a whirring noise under the hood. It'll do it for up to a minute or two, and is the throttle realigning itself. As for overboost and lean mixture, both of those could be a sign of a wastegate problem (wastegate not opening, causing the car to overboost?). I don't know, but maybe the DV is going out on you also.

I believe the 1.8T guys will be able to set you straight on this - I'm just trying to take a shot at it because there were no other replies at the time. Hopefully this will end up helping. Click the search button near the top of the page and search out each of your codes in turn and see who else has posted them and what the results were - that'll help you out a lot.
 
  #3  
Old 12-10-2007, 02:33 PM
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Default RE: 1.8t B5 engine lobes and idles erratically

removed TB. Found it to be dirty. I'll clean it tonight. As soon as i pulled the TB off, I found a broken vacuum tee that runs from the intake manifold. The tee ismade out of plastic. (don't think plastic likes theoil thats leakingfrom the broken crankcase breather tube. (called the "7 tube")) Iwill replace both of these tonight. Maybe this will fix my turbo problem too...acts like its in limp mode. Followed the vac line out to the 710N valve.
 
  #4  
Old 12-10-2007, 02:38 PM
acetrebo's Avatar
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Join Date: Nov 2005
Location: Columbus Ohio
Posts: 3,393
Default RE: 1.8t B5 engine lobes and idles erratically

That broken t probably caused most of the codes.

Disconnect the negative battery cable for a minute, to clear the codes, and reset the computer. make sure you have your stereo code first.
 
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