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vwdriverfoundvw
Samba Member
Joined: June 02, 2004
Posts: 275
Location: Holy Cross, Ca
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 Posted: Tue Feb 02, 2010 5:29 pm Post subject: Loss of power at hwy speeds |
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I recently pulled my engine to put in a new clutch and a couple oil seals. It ran great before this procedure but started acting funny since. It will cruise all day at 60 but when I go to pass someone or pull up a long grade it starts to lose power. There is plenty of power getting up to speed and even when passing it will get up to a passing speed but cannot maintain it for very long before it starts hiccuping a bit and losing power.
Info:
'72 Westy
Dual Solex Carbs
Dual Vacuum Distributor
2.0L longblock |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51153
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Tue Feb 02, 2010 5:33 pm Post subject: |
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And the fuel filter is ............?
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Sloride
Samba Member
Joined: February 09, 2002
Posts: 926
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vwdriverfoundvw
Samba Member
Joined: June 02, 2004
Posts: 275
Location: Holy Cross, Ca
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| Posted: Tue Feb 02, 2010 7:54 pm Post subject: |
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The clutch is definitely ok.
I'm pretty sure the fuel filter is not clogged. I pulled the main line off the T and ran the fuel pump to make sure things were flowing good. It seemed fine.
Why would it only happen at hwy speeds and not normal driving around town? I'll throw a new filter on there just to make sure. This one does have over 12,000 miles on it now.
Could a manifold vacuum leak cause this? I reused my old gaskets when I put them back on because I couldn't get new ones in time. |
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borninabus
Samba R&D Dept.
Joined: May 18, 2006
Posts: 4539
Location: Arizona Highways
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| Posted: Tue Feb 02, 2010 8:35 pm Post subject: |
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i will ask more specifically about "hiccuping a bit and losing power".
like a misfire?
or more sharp (on/off) like fuel cut off?
i've experienced both ignition & fuel problems that exhibit both these types of symptoms.
checked your timing AND overall condition of ignition AND fuel systems AND did a full tune up AND double checked all your electrics after install?
i assume
sounds like it's time to get busy 
don't forget the strainer in the tank and your primary electricals 
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Last edited by borninabus on Tue Feb 02, 2010 8:39 pm; edited 1 time in total |
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Krautski
Samba Member
Joined: March 28, 2009
Posts: 874
Location: WA
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| Posted: Tue Feb 02, 2010 8:38 pm Post subject: |
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Accelerator pumps properly set?
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Emeritusx
Samba Member
Joined: June 20, 2008
Posts: 2775
Location: 12 inches behind the wheel
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| Posted: Tue Feb 02, 2010 8:44 pm Post subject: |
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The reason it could be your filter because at lower rpm's your carb bowls are filling and there is enough gas to keep things happy, but empty those bowls faster then they can fill (clogged filter) you will start running lean..
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82 Westy ☢, 66 Splitty ☮, 73 Type 181 ✠ |
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vwdriverfoundvw
Samba Member
Joined: June 02, 2004
Posts: 275
Location: Holy Cross, Ca
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| Posted: Wed Feb 03, 2010 12:36 pm Post subject: |
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by "hiccuping a bit and losing power" i mean that it will be accelerating strongly then just kind of cut off/on.
Thanks for all the tips guys.
I guess I'll get to work.
I'll make sure to post what I find out. |
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braidmeister
Samba Member
Joined: June 23, 2008
Posts: 13
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| Posted: Wed Feb 03, 2010 9:54 pm Post subject: |
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| Is the fuel line crimped or hose pinched? |
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Emeritusx
Samba Member
Joined: June 20, 2008
Posts: 2775
Location: 12 inches behind the wheel
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| Posted: Wed Feb 03, 2010 11:14 pm Post subject: |
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| vwdriverfoundvw wrote: |
by "hiccuping a bit and losing power" i mean that it will be accelerating strongly then just kind of cut off/on.
Thanks for all the tips guys.
I guess I'll get to work.
I'll make sure to post what I find out. |
That sounds typical of a clogged filter
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82 Westy ☢, 66 Splitty ☮, 73 Type 181 ✠ |
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Amskeptic
Samba Member
Joined: October 18, 2002
Posts: 8568
Location: All Across The Country
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| Posted: Thu Feb 04, 2010 12:25 am Post subject: Re: Loss of power at hwy speeds |
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| vwdriverfoundvw wrote: |
I recently pulled my engine to put in a new clutch and a couple oil seals. It ran great before this procedure but started acting funny since. It will cruise all day at 60 but when I go to pass someone or pull up a long grade it starts to lose power. There is plenty of power getting up to speed and even when passing it will get up to a passing speed but cannot maintain it for very long before it starts hiccuping a bit and losing power.
Info:
'72 Westy
Dual Solex Carbs
Dual Vacuum Distributor
2.0L longblock |
Make no assumptions about what has or has not been "checked recently".
If you have an aftermarket electric fuel pump (with that 2.0 longblock, I am assuming you do), those things can get all stupid on you under demand. This is dangerous, because it can give you a lean condition right when you really don't want it. You can have excellent fuel pump pressure at idle while testing it, but it starts a death arrythymia out on the road where you cannot see it or hear it even. Before you blame the pump itself, check the wiring carefully. I had a poor connection hidden under the plastic shielding of my cheap connector, and it gave me your symptoms then made my poor bus act like it was running out of gas finally. Everything checked out! Everything! Except that warm connector, wtf?
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Thu Feb 04, 2010 6:19 am Post subject: |
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my '69 had a clogged filter
the symptoms were:
normal power and acceleration until 55mph
then loss of power and speed until 45mph
normal power until reaching 55mph ...
45, 55, 45, 55
new filter 62mph steady
Aloha
tp |
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erwinsm
Samba Member
Joined: February 27, 2006
Posts: 156
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| Posted: Mon Jul 16, 2012 6:48 am Post subject: |
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| Did you ever find the problem ? |
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