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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIII-A3/B4 TDIs

VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old February 2nd, 2006, 19:50   #1
grattanboy
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Default fuel shut of valve (n109)

On my way home from work when I noticed that I lacked a little power driving down the highway. Got home and put the Vag com on and got a
01237 Fuel shut -off valve (n109) 04-00 mechanical malfunction. What should I do first, I notice today that when I started me car it reved up then back down to idle. thanks Mike

98 jetta
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Old February 3rd, 2006, 07:31   #2
jck66
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It might just be the gasket that has become dislodged. This is a fairly well documented issue with the A3 Jetta TDI. Some poking around on the forums should give you more detail. Or maybe some kind Jetta-driving soul will chime in.
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Old February 4th, 2006, 06:39   #3
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fuel shutoff o-ring has probably fallen out of place. Happened twice on my 98 and I've only got 94k miles on it.

Easy to fix, a little hard to get at.

You need to remove all the injector lines.

The fuel cutoff solenoid is directly above where the injector lines go into the pump, can't miss it as it has a single wire going to it.

Need a crowesfoot wrench or be very skilled with channel locks to unscrew the valve.

Once you pull it out, you'll see the o-ring has probably slid down the shaft and won't allow the FCV to function properly.

carefully without loosing the o-ring push it back up the shaft to be snug with the base of the FCV.

Reassemble everything and you're back in business.

I can do it in about 15 min, but I've also done it more than once!
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Old February 5th, 2006, 03:39   #4
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I just took mine out to check on the o-ring. I didn't have to take any of the injector lines off, but it shure would have helped. It's an 8mm nut at the top, and I think a 24 mm for the actual N109. I didn't have a 24mm at work (long story), so I tried a 15/16th wrench. If possible, use the correct size wrench, but gently using the 15/16th loosened the thing, and got it tightened up.
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Old February 5th, 2006, 05:18   #5
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waaaaay, way cool info....

this kind of readily available, intimate knowledge of our cars and motors is one of the main reasons I bought mine...
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Old February 6th, 2006, 18:05   #6
grattanboy
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Default fuel shut off

Thanks for the info. My o-ring was in the right place when I pulled my valve Saturday. I made sure everything was clean when I put it back together. I still had the same problem of little power over 2000 rpm. Tapped on the valve and took it for another drive and the car was back to normal. I orderd another valve thinking the other one was sticking or dirty. thanks for the help.
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Old February 6th, 2006, 18:20   #7
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Curiousity question.

Could this account for a 1Z that "hiccups (occasional miss)" at only cold idle? New behavior for the B4 for the last week or so.

Thanks, Bruce
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Old February 7th, 2006, 09:55   #8
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Bruce, technically, if the N109 doesn't open or close properly, it could mean that the fuel isn't being thrown into the engine at the right quantities. This check is one of those things which will take you 10-15 min tops to take a look at. Might be worth it just to see. If the o-ring is in place, and tapping it doesn't change anything, then it's obviously not the source of your issue. I pulled mine apart, as I said, because when the car is cold, and the temperature is below freezing, I can get a bit of an RPM spike when starting (something like to 1500-1600 RPM). The o-ring was lined up, and everything seemed to be fine on my N109, so obviously this is coming from something else.
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Old February 12th, 2006, 10:11   #9
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Drivbiwire is suggesting that this solenoid may be the route of my low power issues which I have been fighting for over a year, he says that I should replace it, anyone know where I can buy one? 1stvwparts.com brings it up but won't give a price or put it in the cart? Can't find on TDIparts.com or Impex. HELP!

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Old February 13th, 2006, 07:55   #10
grattanboy
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Default fuel Shut off

I found one for my A3 at www.worldimpex.com/index.html for $89.00. I ended up buying one at the dealership for the same price. Comes complete with spring and plunger. IMPEX SKU # 177697

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Old February 13th, 2006, 15:46   #11
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No one has asked me for one before.
Part number appears to be 028130135F, and the number for the seal is 068130139. Both items appear to be dealer only, but I will make a call in the AM.
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Old February 13th, 2006, 19:09   #12
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Thanks for the part number Dan, Auburn VW has them for $66.61, don't know if I'll buy one or try the o-ring first?
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Old February 14th, 2006, 12:03   #13
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I'm interested to hear if paramedick has any follow up to this as previously only Jetta owners have reported this problem. I can't imagine that the parts are that different between 1Z and AHU.
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Old February 14th, 2006, 15:23   #14
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Haven't had time to follow up on it. AND, my tools are split between two houses right now. Guess where the big metric tools are?
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Old February 15th, 2006, 11:04   #15
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Um, the house where your car and butt aren't?
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