1.9L O2 sensor and vacuum hose

JDub113 · Last edited by JDub113 on Sat Mar 04, 2017 8:15 pm; edited 1 time in total

I have a hesitation issue only after running and stopped at a light or congested slow moving traffic.

I did new plugs, wires, cap rotor, rebuild vw fuel injectors fro van cafe. The issue got worse after that. I unplug the o2 and it runs like a champ.

My exhaust looks like crap. I replaced most vacuum lines, but I think that's why it may be leaning it out, if that's even correct.

However, the o2 sensor looks universal to me but does have the wire that goes all the way up. I want to replace it, but should I splice a new wire to run into the green insulated wire or cut the mystery o2 wire and splice there? I'm going to buy the correct Bosch splice in 02 sensor. This is on an 1984 1.9l

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84 Wolfsburg Edition Westy

Ahwahnee · Posted: Mon Feb 27, 2017 6:34 pm Post subject: Re: 1.9L O2 sensor

I just used a cheap universal Bosch lambda (about 11 bucks I think) and spliced it to the existing lead. I don't think it matters so long as the connection is tight and stays dry.

Been on there several years, works fine, mpg in the 20s.

hdenter · Posted: Mon Feb 27, 2017 7:05 pm Post subject: Re: 1.9L O2 sensor

If your exhaust "looks like crap", then it may have leaks. If that is the case, a new O2 sensor won't help you. Just because unplugging the O2 helps it run better doesn't mean the O2 is bad. Exhaust leaks, bad T2 sensor and other things can provide bad info to the ECU and make for poor performance. The fact that it runs fine out of loop is good news, hopefully it will be something minor. Check for leaks, test the T2, get the digijet pro training manual and go through the troubleshooting guide.

Good Luck!

Hans
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'79 triple white convertible bug
'84 sunroof vanagon
'85 weekender

JDub113 · Posted: Mon Feb 27, 2017 9:04 pm Post subject: Re: 1.9L O2 sensor

I figured for <$20 I might as well throw one on. I have a new temp 2 sensor also from reading other "hesitation" threads.

My other thought is a vacuum leak and most hoses have been replaced, but some hoses I simply don't see listed from vendors or I'm not looking in the right place. Maybe I'll take a photo of the engine bay and circle a few hoses to get help with that.

Otherwise I don't have the coin for an exhaust system, but maybe my cousin can touch up some cracks with the welder. I just have some aluminum tape on for now.
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84 Wolfsburg Edition Westy

JDub113 · Posted: Wed Mar 01, 2017 10:36 pm Post subject: Re: 1.9L O2 sensor

Here is an amateur photo pointing out hoses I cannot find. In the middle I circled one, and two lines to mark the two hoses I need. Also those three hoses are collapsed, almost clamped off. Upper right circle, on the bottom of that thing is a rubber vacuum boot that goes from large diameter to that very small plastic vacuum hose. Any help on those?

I also am going to fiddle with the Tps this weekend.

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84 Wolfsburg Edition Westy

Ahwahnee · Posted: Thu Mar 02, 2017 8:30 am Post subject: Re: 1.9L O2 sensor

All those hoses marked look like stock auto parts store items to me - sold by the foot.

I do not recognize the part you have circled but as I have a manual trans and no power steering perhaps that makes a difference.

JDub113 · Posted: Thu Mar 02, 2017 1:20 pm Post subject: Re: 1.9L O2 sensor

The true circled part is the round black thing in the upper right corner in your picture.

Every time I've gone to "oreillys" they have heater hose, fuel hose or some other hose that my vw doesn't require. None of it is ever braided either and for the larger braided hose, I need that so it doesn't pinch shut when bent 90*
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84 Wolfsburg Edition Westy

Ahwahnee · Posted: Thu Mar 02, 2017 7:15 pm Post subject: Re: 1.9L O2 sensor

Okay - it was the part in an ellipse that I did not recognize.

I used auto parts store hose to replace the braided hose and it has not kinked:

Might have been some extra stiff special-purpose hose like 'automatic transmission fluid hose' - but it is just sucking oily fumes so it seems okay in that role.

jerryherb · Samba Member Joined: October 30, 2015 Posts: 205

Im sure someone here already compiled a list of vacuum hose lengths/diameters. can someone point me to it for 1.9 WBX (late 85, digijet)? At least a total length of various diameters would be great. thanks!

JDub113 · Posted: Thu Mar 02, 2017 9:37 pm Post subject: Re: 1.9L O2 sensor

JDub113 · Posted: Sat Mar 04, 2017 6:10 pm Post subject: Re: 1.9L O2 sensor

Any sources for the 2 90* bent hose for the aux air regulator?

I think these are the last two pieces I need to put it all back together.
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84 Wolfsburg Edition Westy

Ahwahnee · Posted: Sat Mar 04, 2017 7:02 pm Post subject: Re: 1.9L O2 sensor

Sometimes I just cut down a hose for something else when I what I need is a 90° elbow.

This shows how a Gates hose can be trimmed for use on one of my other cars.

I would take them to a friendly auto parts store when they are not very busy and see what they can match up.

Gates has an interchange site but I don't see those listed, possibly because they are common.

http://www.gates.com/all-search-tools/search-by-application

BTW - If you do not have a hose cutting tool - they are (IMO) very worthwhile for getting clean, precise right angle cuts.

JDub113 · Posted: Sat Mar 04, 2017 8:14 pm Post subject: Re: 1.9L O2 sensor

Awesome idea. Before reading that I just used a longer hose to make the 90 better without it pinching at all. That will most likely pinch over time though. I might go hunting for some 90* tomorrow. Thank you!
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84 Wolfsburg Edition Westy

JDub113

Anybody know what female connector I need to order to fit in the ECM wiring harness to hook up my new coax wire? I think its one of the Junior Power Timer Female Terminals, just not sure on the size. Help please.

https://www.bmotorsports.com/shop/index.php/cPath/109_136
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84 Wolfsburg Edition Westy

JDub113

Well, these should be the same, I'll find out when they get here:

http://www.bmotorsports.com/shop/product_info.php/cPath/109_136/products_id/606

Anybody care about the metal plating on the ecu prongs? Here's mine:

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84 Wolfsburg Edition Westy

atomatom

i replaced the aux air elbow, but the new one started to crack pretty quickly as well. i put some clamps on it and some black rtv. likewise with the connection into the s-boot. my s-boot is in poor condition, with several cracks. i cleaned it and filled in the cracks. i have a spare, but at some point my system stopped leaking. it still comes back from time to time, the surging idle being the main clue.

you can remove and test your hoses. plug one end, submerse in water and blow air into them.

i believe this the elbow i bought, however, i don't really recommend this supplier. i would probably fashion one from a plumbing supply shop
https://www.cip1.ca/ProductDetails.asp?ProductCode=VWC-022-129-637
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84 Vanagon Westy, 1.9L, California raised but defected to Canada.

JDub113

Thanks for the link. I just used longer hose to make the bend. Anybody know what's up with my ecu terminals and maybe there is a place I can have them re coated?
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84 Wolfsburg Edition Westy

atomatom

i would not recoat them at all. very gently sand, but i wouldn't even press my luck with that. you don't want to stress the 30 year old soldering on the board that these are connected to.

just smear with dialectic grease, and you should be good.
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84 Vanagon Westy, 1.9L, California raised but defected to Canada.


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