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16CVs 
Samba Member
Joined: February 22, 2004
Posts: 4026
Location: Redwood City, California
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 Posted: Wed Oct 02, 2019 6:58 pm Post subject: Re: Bad Gas Mileage |
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Have you checked your grounds? Is your tail pipe Fat? My 1.9 was running like crap and using a ton of gas. After cleaning the grounds it all went away.
Stacy
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1987 Syncro Westfalia Triple knob (bastard)
1989 Syncro Tristar Triple knob "Swedish"
2013 Jetta Hybrid a true "Zwitter"
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Keep Your van running and upkept tastefully for the love of the hobby.
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jlrftype7
Samba Member
Joined: July 24, 2018
Posts: 3582
Location: Chicago
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| Posted: Thu Oct 03, 2019 6:57 am Post subject: Re: Bad Gas Mileage |
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| 16CVs wrote: |
| Have you checked your grounds? Is your tail pipe Fat? My 1.9 was running like crap and using a ton of gas. After cleaning the grounds it all went away Stacy |
. Me too..... 
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'68 Westy- my first VW and vehicle/Bus- long gone.- sold it to a traveling Swiss couple....
'67 Type 3 Fastback, my 2nd car- gone
'69 Semi-Auto Stick Shift Beetle-gone
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‘84 Tin Top - Hilga....Auto
Last edited by jlrftype7 on Thu Oct 03, 2019 5:05 pm; edited 1 time in total |
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andrewvwco
Samba Member
Joined: February 23, 2017
Posts: 298
Location: Estes Park colorado
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| Posted: Thu Oct 03, 2019 7:41 am Post subject: Re: Bad Gas Mileage |
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| 16CVs wrote: |
Have you checked your grounds? Is your tail pipe Fat? My 1.9 was running like crap and using a ton of gas. After cleaning the grounds it all went away.
Stacy |
Same clean all the grounds of any dirt, paint, exc down to bare metal. Put a fresh bolt and new ground cables too it is easy and cheap.
Here is the 1.9L ground locations.
https://www.thesamba.com/vw/forum/viewtopic.php?t=662834
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Be here now, not in the past and not in the future, but be here now. |
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-Derek-
Samba Member
Joined: February 24, 2009
Posts: 41
Location: Seattle, WA
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| Posted: Sat Oct 05, 2019 8:39 pm Post subject: Re: Bad Gas Mileage |
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Thanks all for the replies. Busy week at work, but took some time today to fuss with the grounds. Re-terminated a bunch of the small wire grounds to new ring terminals. Re-terminated the main engine ground strap. Cleaned everything. Made sure all the terminals were nested neatly and bolts tight. Measured nil resistance with engine cold. But after running there resistance was as I quoted earlier (~3 ohm from block to chassis). Real head scratcher.
I repeated the two diagnostic tests I performed last sunday with the same results. I'll borrow a fuel pressure test kit from the local FLAPS and measure the pressure next.
Unrelated, but while doing an oil change I spotted a coolant leak from the new water pump. Grrrr..... Looks like I'll be headed for a GW warranty claim.
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'83 Vanagon
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-Derek-
Samba Member
Joined: February 24, 2009
Posts: 41
Location: Seattle, WA
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| Posted: Sat Oct 05, 2019 8:51 pm Post subject: Re: Bad Gas Mileage |
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| 16CVs wrote: |
| ...Is your tail pipe Fat? ... |
Not sure what you mean. My tailpipe is ugly for sure.
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-Derek-
Samba Member
Joined: February 24, 2009
Posts: 41
Location: Seattle, WA
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| Posted: Tue Oct 08, 2019 6:30 pm Post subject: Re: Bad Gas Mileage |
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Fuel pressure is 36 psi with vacuum line disconnected, 32 psi connected. So a little higher than Bentley specifies, but not drastically off.
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-Derek-
Samba Member
Joined: February 24, 2009
Posts: 41
Location: Seattle, WA
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| Posted: Sun Oct 20, 2019 8:21 pm Post subject: Re: Bad Gas Mileage |
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Today was the first lengthy drive since adjusting the timing and re-doing the grounds. I filled up before my 106 mile trip, and put 6 gallons back in when I got home, 17.6 mpg! 70/30 mix of highway/city. I really can't expect much better with my automatic.
However, whether as a consequence or coincidence, drive-ability is not what it was. Twice while accelerating from ~10 mph to ~35 mph the engine hesitated, alternating between bogging down and surging. Felt like I was behind the power curve. By backing off almost to idle and gently applying the throttle the rpm would slowly pick up. This happened while the engine was cold, didn't repeat after warming up or while driving at faster speeds.
-Derek
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djkeev
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Joined: September 30, 2007
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Location: Reading Pennsylvania
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a2wolfsburggli
Samba Member
Joined: October 30, 2018
Posts: 279
Location: WI
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| Posted: Mon Oct 21, 2019 7:36 am Post subject: Re: Bad Gas Mileage |
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| -Derek- wrote: |
Today was the first lengthy drive since adjusting the timing and re-doing the grounds. I filled up before my 106 mile trip, and put 6 gallons back in when I got home, 17.6 mpg! 70/30 mix of highway/city. I really can't expect much better with my automatic.
However, whether as a consequence or coincidence, drive-ability is not what it was. Twice while accelerating from ~10 mph to ~35 mph the engine hesitated, alternating between bogging down and surging. Felt like I was behind the power curve. By backing off almost to idle and gently applying the throttle the rpm would slowly pick up. This happened while the engine was cold, didn't repeat after warming up or while driving at faster speeds.
-Derek |
Mine did this from Idle to about 25mph. I swapped out the injector seals and all was good. What your describing is most likely a vacuum leak.
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