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devesvws
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Joined: January 05, 2004
Posts: 1540
Location: madison va
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 Posted: Sat Mar 30, 2019 3:59 pm Post subject: 91 2.1 running rough after sucking in rain water |
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my 91 2.1 snorted rain water the other day and it got in the air box and it started running and missing like crazy....thought it would dry out and run well but not so, seems like cylinder 3&4 isn’t firing but 1&2 is, 1&2 plug was black with soot but 3&4 was dry as a bone? I unplugged 3&4 at the dist cap and got an orange spark and unplugged fuel injector plug of those two with no change in engine speed but unpluging 1&2 of either plug or fuel injectors it shuts off the engine....the spray pattern was off a bit so I swapped out 3&4 injectors with good used ones... a few years ago i had an oxygen sensor short out in a rain storm but dont think its that this time but I installed I new one with no change??? Things I have done so far... swapped the ecu, new oxygen sensor new dist cap and rotor two known good fuel injectors, fuel pressure regulator, spark plugs checked for air leak checked wiring for any change in rpms (thats how i found my new GoWesty distributor was a bad one) blew out the return fuel line, advance the distributor retarded the distributor unplugged the oxygen sensor plugged it back in unplugged the afm plugged it back in used my spare ecu and even did a compression test....btw I have the shoebox-electronix ecu monitor and everything was checking out but it started to flake out and its not reading right now...
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THE FEW THE PROUD THE ORIGINAL VW WATERBOXER -> looking for a original 91 vanagon owners manual with 1991 on the cover http://www.youtube.com/watch?v=pmuiG2tUsP4&feature=share https://picasaweb.google.com/101290228103300323836/BostonBobFlywheelVideo#5543000332201103922 |
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DanHoug
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Joined: December 05, 2016
Posts: 4770
Location: Bemidji, MN
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| Posted: Sat Mar 30, 2019 4:15 pm Post subject: Re: 91 2.1 running rough after sucking in rain water |
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have you changed your air filter? a wet air filter can cause drivability havoc.
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-dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
www.thefixitworkshop.com |
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DuncanS
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Joined: October 17, 2013
Posts: 4583
Location: New Hampshire
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| Posted: Sat Mar 30, 2019 6:41 pm Post subject: Re: 91 2.1 running rough after sucking in rain water |
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| Idle stabilizer control module behind the right tail light. |
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devesvws
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Joined: January 05, 2004
Posts: 1540
Location: madison va
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djkeev
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Joined: September 30, 2007
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Location: Reading Pennsylvania
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The Carrot
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Joined: November 18, 2013
Posts: 173
Location: Ontario, Canada
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| Posted: Sun Mar 31, 2019 6:42 am Post subject: Re: 91 2.1 running rough after sucking in rain water |
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Morning,
Hope you get it running OK. How did rain water get into the airbox? Looking to avoid that possibility.
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1990 Orly Blue Carat |
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devesvws
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Joined: January 05, 2004
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Location: madison va
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SyncroButter
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Joined: February 02, 2016
Posts: 383
Location: Seattle
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| Posted: Mon Apr 01, 2019 11:06 am Post subject: Re: 91 2.1 running rough after sucking in rain water |
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| devesvws wrote: |
| The Carrot wrote: |
Morning,
Hope you get it running OK. How did rain water get into the airbox? Looking to avoid that possibility. |
I guess the right air vent? first time ever and I have had a lot of vanagons it was raining very hard that morning |
I cannot imagine how this could happen from a hard rain, I think to get water in your intake you pretty much need to have water coming in from underneath the van (assuming your Vanagon is a regular 2wd with the stock 2.1 airbox) like if you drove through a flooded area.
How exactly did you verify the "water got in the air box" claim? Sorry if I sound skeptical but... I'm skeptical 
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Grant
In the stable: 1986 Syncro Westfalia/Bostig, 1989 Doka Tristar, 1974 Vespa Rally 200, 1973 Vespa Primavera 125, 1963 Solex 2200, 1938 Buick Special
Gone but not forgotten: 1989 Porsche 944, 1973 Standard Beetle |
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devesvws
Samba Member
Joined: January 05, 2004
Posts: 1540
Location: madison va
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| Posted: Mon Apr 01, 2019 3:42 pm Post subject: Re: 91 2.1 running rough after sucking in rain water |
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| SyncroButter wrote: |
| devesvws wrote: |
| The Carrot wrote: |
Morning,
Hope you get it running OK. How did rain water get into the airbox? Looking to avoid that possibility. |
I guess the right air vent? first time ever and I have had a lot of vanagons it was raining very hard that morning |
I cannot imagine how this could happen from a hard rain, I think to get water in your intake you pretty much need to have water coming in from underneath the van (assuming your Vanagon is a regular 2wd with the stock 2.1 airbox) like if you drove through a flooded area.
How exactly did you verify the "water got in the air box" claim? Sorry if I sound skeptical but... I'm skeptical |
lol for one thing the filter was damp and it had water residue at the bottom where the filter sits I was like how the heck??? I had drove about 40 miles in this storm with ponding on the rd so I pulled off to take a nap for about 45 min and when I went to start it it started to miss real bad and the next 10 or 15 miles home was a bit on the slow side with very little power...
_________________
THE FEW THE PROUD THE ORIGINAL VW WATERBOXER -> looking for a original 91 vanagon owners manual with 1991 on the cover http://www.youtube.com/watch?v=pmuiG2tUsP4&feature=share https://picasaweb.google.com/101290228103300323836/BostonBobFlywheelVideo#5543000332201103922 |
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DanHoug
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Joined: December 05, 2016
Posts: 4770
Location: Bemidji, MN
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| Posted: Mon Apr 01, 2019 4:02 pm Post subject: Re: 91 2.1 running rough after sucking in rain water |
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the good news is that since the air intake for the AFM is 6" above the bottom of the airbox, you didn't suck in a slug of water and bend a rod or something nasty.
were it my van and this rough running truly associated with the rain run, i'd pop the dist cap, dry it and the dist with a hair dryer, replace the plug wires, change spark plugs or at least clean the white insulator, put an abundance of IsoHeet in the tank while it is low, change fuel filter and drain out some gas to check for water, and think about a fuel tank reseal including the tipover valve grommets in the fuel expansion chambers.
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-dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
www.thefixitworkshop.com |
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djkeev
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Joined: September 30, 2007
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devesvws
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djkeev
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Wildthings
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Joined: March 13, 2005
Posts: 50336
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| Posted: Mon Apr 01, 2019 6:11 pm Post subject: Re: 91 2.1 running rough after sucking in rain water |
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| djkeev wrote: |
Correction, you are probably getting a fuel/water mix at the injectors.
Dave |
^^^^ This
You need to determine where the water got into the fuel system and to get any water that is still in there out. |
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Wildthings
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| Posted: Mon Apr 01, 2019 6:13 pm Post subject: Re: 91 2.1 running rough after sucking in rain water |
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| djkeev wrote: |
Correction, you are probably getting a fuel/water mix at the injectors.
Dave |
^^^^ This
You need to determine where the water got into the fuel system and to get any water that is still in there out. |
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DuncanS
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Joined: October 17, 2013
Posts: 4583
Location: New Hampshire
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| Posted: Tue Apr 02, 2019 3:31 am Post subject: Re: 91 2.1 running rough after sucking in rain water |
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| 100% behind Dave on this. Had a friend who put in a brand new fuel tank and had the same problem you do. It turned out one of the 30 year old vapor tanks had a gash in it from road shrapnel and took on water every time it rained. It could also be the hoses that run from the vapor tanks to the main. |
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E1
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Location: Westfalia, Earth
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| Posted: Tue Apr 02, 2019 8:28 am Post subject: Re: 91 2.1 running rough after sucking in rain water |
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Add me to the evap tank list.
You may have a hole in one, or the grommet's bad.
Pour a quart of gas into a milk jug, wait a few minutes, and see if it separates into two layers.
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‘84 Westy, 2.1L with Digijet, 5.43 R+P, GT Gears
"Adding power makes you faster on the straights.
Subtracting weight makes you faster everywhere."
— Colin Chapman |
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devesvws
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Location: madison va
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dhaavers
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Joined: March 19, 2010
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Location: NE MN (tinyurl.com/dhaaverslocation)
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| Posted: Tue Apr 02, 2019 4:40 pm Post subject: Re: 91 2.1 running rough after sucking in rain water |
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In a mere 1000 words:
- Dave
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86 White Wolfsburg Westy Weekender
"The WonderVan"
<EDITED TO PROTECT INNOCENT PIXELS> |
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