Can't find EVAP Vacuum Leak
09-27-2009, 08:50 PM
#1
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Can't find EVAP Vacuum Leak
Does anyone have a good procedure for testing the EVAP vacuum lines for leaks. At this point I am not sure which ones they are and if they are somehow independent from other vacuum lines. Is there a vacuum "tank" associated?
I get a fault code that is setting the MIL. The code on VAG-COM shows that the vacuum is "too low" on the Evaprative Control circuit. I recently replaced the valve cover/tensioner gaskets and replaced some cracked vacuum hoses near the back of the engine under the plastic covers. As far as I can tell I don't have a leak. But I did not have a MIL before starting my gasket project.
I have hears of bad N70? valves... is this related. Where do I start since I can't find any obvious leaks.
Any help is appreciated.
I get a fault code that is setting the MIL. The code on VAG-COM shows that the vacuum is "too low" on the Evaprative Control circuit. I recently replaced the valve cover/tensioner gaskets and replaced some cracked vacuum hoses near the back of the engine under the plastic covers. As far as I can tell I don't have a leak. But I did not have a MIL before starting my gasket project.
I have hears of bad N70? valves... is this related. Where do I start since I can't find any obvious leaks.
Any help is appreciated.
09-29-2009, 09:27 AM
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Is your code coming up as P0441? I think the only solution would be is; take it to certified mechanic & have a smoke test done. Inspect vacuum lines for small cracks,currosion,& splitting.
09-30-2009, 07:03 PM
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Thanks for the response. I am thinking there must be a common vacuum leak location for that system. I'll post if I find anything. Anyone else have any more thoughts or experiences with that system?
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10-08-2009, 07:31 PM
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So I guess I am only posting this to help someone else in the future as I am embarrased to share this.
I can't believe I did this but I replaced a vacuum line check valve while changing the cam tensioner seals. However, I put it in backwards. You can look up the part that I replaced here: http://www.ecstuning.com/product_lib...ck%20Valve.jpg
Good luck. This will set a check engine light though because the N80 valve does not get any vacuum signal.
I can't believe I did this but I replaced a vacuum line check valve while changing the cam tensioner seals. However, I put it in backwards. You can look up the part that I replaced here: http://www.ecstuning.com/product_lib...ck%20Valve.jpg
Good luck. This will set a check engine light though because the N80 valve does not get any vacuum signal.
12-23-2009, 07:48 PM
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Excuse for stoopid ?'s but I just bought a 99 passat wagon w/ 1.8T. have already been to the shop and have been told o2 sensor is the cause of my emission light in the dash going off. people want $300 to replace one sensor. question is: can i do this myself simply or is it worth paying?
I am planning on having this beautiful car for awhile, is it worth getting a service manual and code scanner?
Any info is greatly appreciated.
I am planning on having this beautiful car for awhile, is it worth getting a service manual and code scanner?
Any info is greatly appreciated.