Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts New!  See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
Van has no power, uphill, highway and now on flat...
Forum Index -> Vanagon Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
greenwesty73
Samba Member


Joined: November 10, 2008
Posts: 39
Location: Montreal, Quebec, Canada
greenwesty73 is offline 

PostPosted: Thu Jun 11, 2015 12:17 pm    Post subject: Van has no power, uphill, highway and now on flat... Reply with quote

Hi,

My van was running really fine, that was until i got to have no power on the highway and hills (low degree). cannot go beyond 3000rpm, and seems to get worse.

My mechanic changed sparkplugs, distributor cap and fuel filter. Idle is good, but has soon has i drive and it warms up, same same, and problem gets to be at lower speeds now...And started leaking oil while he was checking high reving. Cat blocked, fuel pump, timing...where to look?

Thank you!

Greenwesty
89 wolfburg bluestar
_________________
___________

1973 westfalia 1700 single carb
1989 vanagon gl wolfsburg
Back to top
View user's profile Send private message Gallery Classifieds Feedback
snowsyncro
Samba Member


Joined: January 11, 2009
Posts: 1499
Location: East Preston, Nova Scotia, Canada
snowsyncro is offline 

PostPosted: Thu Jun 11, 2015 12:35 pm    Post subject: Reply with quote

Those are symptoms of fuel starvation. You said your mechanic changed the fuel filter, but did he check fuel pressure and fuel flow rate? When he changed the filter, did notice dirt or water? Depending on where the filter setup is, it may be possible to have a new filter, but there can still be dirt and/or water in the pump itself. This will reduce fuel flow.

If fuel flow is good, next would be to check the injectors. You can do a quick spray test and fuel volume test. Procedure is in Bentley.

Timing is another possibility. Very easy to check. RPM > 3500 will be full advance. Make a mark on pulley as described in tencent post. You can find that in the FAQ section.

RonC
Back to top
View user's profile Send private message Gallery Classifieds Feedback
daroota
Samba Member


Joined: December 19, 2012
Posts: 266
Location: bc
daroota is offline 

PostPosted: Thu Jun 11, 2015 2:04 pm    Post subject: Reply with quote

Also A tear in your intake boot may be the culprit. Allowing too much Air and leaning out your mix.

It's a quick easy check. The increased RPM's torque the engine a bit, which opens the tear and causes no power when over that touchy point.

Just my 2 cents from experience.
_________________
1982 Westy-Air Cooled, Fuel Injected, 4 Speed Manual
Air Cooled Vanagon's FaceBook Group:
www.facebook.com/groups/AirCooledVanagon/
Back to top
View user's profile Send private message Gallery Classifieds Feedback
wecm31
Samba Member


Joined: August 05, 2012
Posts: 358
Location: Eganville, Ontario
wecm31 is offline 

PostPosted: Thu Jun 11, 2015 3:42 pm    Post subject: Reply with quote

daroota wrote:
Also A tear in your intake boot may be the culprit. Allowing too much Air and leaning out your mix.

It's a quick easy check. The increased RPM's torque the engine a bit, which opens the tear and causes no power when over that touchy point.

Just my 2 cents from experience.


X2...just went through your symptoms, was vacuum leak.
Intake boot clamp found loose Embarassed on intake plenum.

And vacuum leaks are just like fuel starvation at times...
Just that it's too much un metered air.

Try a propane sniff test.
_________________
Gerald P
1985 Vanagon (Betty) & 1985 BMW R80RT (Wilhelm)
vintage boxers!!

Gone are the days we stopped to decide
Where we should go, we just ride:)
Back to top
View user's profile Send private message Gallery Classifieds Feedback
phatveedub
Samba Member


Joined: September 18, 2008
Posts: 93
Location: Sac
phatveedub is offline 

PostPosted: Thu Jun 11, 2015 8:20 pm    Post subject: loss of power Reply with quote

Could be a plugged air filter too - easy enough to check/replace.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
bluebus86
Banned


Joined: September 02, 2010
Posts: 11075

bluebus86 is offline 

PostPosted: Thu Jun 11, 2015 8:39 pm    Post subject: Reply with quote

Where is the oil leak at??? address that first I say. Is this mechanic simply shotgunning the repairs? (ie trying anything on your coin). time for some diagnostic's.

were the old plugs cap and rotor defective?

from fine running to bad suddenly usually is not a spark plug issue. plugs tend to go bad slowly not suddenly.
check timing, check fuel pressure, check the ECU sensors. does the exhaust smell rich?
_________________
Help Prevent VW Engine Fires, see this link.....Engine safety wire information

Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022
Back to top
View user's profile Send private message Gallery Classifieds Feedback
otiswesty
Samba Member


Joined: November 21, 2006
Posts: 1496
Location: Portland
otiswesty is offline 

PostPosted: Thu Jun 11, 2015 9:05 pm    Post subject: Reply with quote

Sounds like when I had a plugged fuel injector. Good compression on all 4 but only running on 3 cylinders.
_________________
1978 Sage Green P22 Westfalia

Just a regular guy
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Vinzanto
Samba Member


Joined: March 22, 2012
Posts: 247
Location: Kansas City
Vinzanto is offline 

PostPosted: Thu Jun 11, 2015 9:43 pm    Post subject: Reply with quote

Timing is worth a check. Have you attempted to adjust the timing lately? I had a similar issue on wet mornings. Would start and idle fine but would not rev over 3-4k. Then when under load had no power. This lead me to believe it was an ignition issue (plugs, cap wires, coil) but after a lot of trial and error dialing my timing in solved the issue.
_________________
1984 Vanagon Westfalia Wolfsberg
Back to top
View user's profile Send private message Gallery Classifieds Feedback
greenwesty73
Samba Member


Joined: November 10, 2008
Posts: 39
Location: Montreal, Quebec, Canada
greenwesty73 is offline 

PostPosted: Sun Jun 14, 2015 3:35 pm    Post subject: Reply with quote

Well...The AFM was thought to be the culprid. That was cleaned, was running awesome saturday morning, later on after 30 miles from the repair, i could not go at some higher speed (65+mph) but it was windy. Today, could not climb a hill on second, had to be in first gear...Normally i'm in third, than second on a tight turn than third again. I hear a rattle in (around) the exaust...Back to the garage if i can get there.

idle is smooth, goes a bit high when hot 1000-1100rpm.

Will have the fuel pump checked, and have check for air leaks. Normally my mechanic is dead on stuff, and pretty good, but with this...
_________________
___________

1973 westfalia 1700 single carb
1989 vanagon gl wolfsburg
Back to top
View user's profile Send private message Gallery Classifieds Feedback
djkeev Premium Member
Samba Moderator


Joined: September 30, 2007
Posts: 27639
Location: Reading Pennsylvania
djkeev is offline 

PostPosted: Sun Jun 14, 2015 4:11 pm    Post subject: Reply with quote

Classic clogged convertor or clogged muffler symptons.

Runs good until it backs up and can't vent exhaust hence it cannot draw in combustion air either.

Dave
_________________
Stop Dead Photo Links how to post photos

Ghia
http://www.thesamba.com/vw/forum/viewtopic.php?t=392473

Vanagon
http://www.thesamba.com/vw/forum/viewtopic.php?p=6315537#6315537

Beetle
https://www.thesamba.com/vw/forum/viewtopic.php?t=482968&highlight=74+super+vert
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Das67bus
Samba Member


Joined: April 06, 2008
Posts: 239
Location: Prescott, AZ
Das67bus is offline 

PostPosted: Sun Jun 14, 2015 4:20 pm    Post subject: Re: Van has no power, uphill, highway and now on flat... Reply with quote

greenwesty73 wrote:
Hi,

My van was running really fine, that was until i got to have no power on the highway and hills (low degree). cannot go beyond 3000rpm, and seems to get worse.

My mechanic changed sparkplugs, distributor cap and fuel filter. Idle is good, but has soon has i drive and it warms up, same same, and problem gets to be at lower speeds now...And started leaking oil while he was checking high reving. Cat blocked, fuel pump, timing...where to look?

Thank you!

Greenwesty
89 wolfburg bluestar


Just curious......did your mechanic offer any help? I would think he/she would try to address the problem(s). ????
_________________
SLOW RIDE........TAKE IT EASY!!!
-Foghat

COMFORTABLY NUMB!!
-Pink Floyd
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Ahwahnee
Samba Member


Joined: June 05, 2010
Posts: 9259
Location: Mt Lemmon, AZ
Ahwahnee is offline 

PostPosted: Sun Jun 14, 2015 4:36 pm    Post subject: Reply with quote

djkeev wrote:
Classic clogged convertor or clogged muffler symptons....


I agree - mine behaved similarly the first time the cat packed it in. Most muffler shops (or good mechanics) can test for the excessive back pressure that is a measurable symptom.

Sometimes a failed cat will rattle, sometimes it will not. If it has a big impact on performance there is usually a change in the exhaust note associated with it.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
greenwesty73
Samba Member


Joined: November 10, 2008
Posts: 39
Location: Montreal, Quebec, Canada
greenwesty73 is offline 

PostPosted: Sun Jun 14, 2015 4:40 pm    Post subject: Reply with quote

@bikerbus: he's so convinced it's the AFM. It ran like a dream for 40-50 miles (which it usually does), then same same, no power. Will talk to him tomorrow, will bring back the van tomorrow.

The engine is a full new parts rebuild (heads and all) with 30k miles on (the van has 250k miles). Computer, coolant hoses, gaz tank +++ all done in the last years. Normally for fuel economy, the ICV is unplugged (i only drive it summers). I replugged it this year, but lately, i get 1000-1100rpm (variable...related?).

Again, thank you all for your inputs.
_________________
___________

1973 westfalia 1700 single carb
1989 vanagon gl wolfsburg
Back to top
View user's profile Send private message Gallery Classifieds Feedback
djkeev Premium Member
Samba Moderator


Joined: September 30, 2007
Posts: 27639
Location: Reading Pennsylvania
djkeev is offline 

PostPosted: Sun Jun 14, 2015 4:57 pm    Post subject: Reply with quote

Crap moves around while driving. Airflow picks it up and takes it with it plugging more and more holes until
The engine barely runs!

Shut it off. Pressure bleeds Off crap settles
Down until the next trip.

I am amazed your mechanic hasn't pulled three bolts freeing the cat or even simply pulled the oxygen sensor making a breathing hole.

All that built up pressure also pressurizes the crankcase, no air can escape so it finds holes to get out!..... Oil seals
_________________
Stop Dead Photo Links how to post photos

Ghia
http://www.thesamba.com/vw/forum/viewtopic.php?t=392473

Vanagon
http://www.thesamba.com/vw/forum/viewtopic.php?p=6315537#6315537

Beetle
https://www.thesamba.com/vw/forum/viewtopic.php?t=482968&highlight=74+super+vert
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
greenwesty73
Samba Member


Joined: November 10, 2008
Posts: 39
Location: Montreal, Quebec, Canada
greenwesty73 is offline 

PostPosted: Sun Jun 14, 2015 6:43 pm    Post subject: Reply with quote

@djkeev:
so if by revving the engine hard, oil started leaking (toward the back of the engine), this would be caused by a pressure build-up, maybe confirming a lack of "breathability" because of a clogged cat.
_________________
___________

1973 westfalia 1700 single carb
1989 vanagon gl wolfsburg
Back to top
View user's profile Send private message Gallery Classifieds Feedback
djkeev Premium Member
Samba Moderator


Joined: September 30, 2007
Posts: 27639
Location: Reading Pennsylvania
djkeev is offline 

PostPosted: Sun Jun 14, 2015 7:24 pm    Post subject: Reply with quote

Yes.

If the engine can't vent via the exhaust it in essence becomes a compressor, the pistons compress air on both the upstroke and downstroke.

The compressed air can escape out the intake and filter but the pressure build up in the crankcase is quite high. The small crankcase vent to the intake manifold is no match for four rapidly moving 94mm pistons.

As a result the air escapes out any crevice it can find.

Dave
_________________
Stop Dead Photo Links how to post photos

Ghia
http://www.thesamba.com/vw/forum/viewtopic.php?t=392473

Vanagon
http://www.thesamba.com/vw/forum/viewtopic.php?p=6315537#6315537

Beetle
https://www.thesamba.com/vw/forum/viewtopic.php?t=482968&highlight=74+super+vert
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Vanagon All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2020, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB