landboat
LoveMyBus Radical
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Location: Staten Island N.Y.
Type: 72 Camper
Name: Harriette
Posts: 472
Topic starter
Long Live the Vw's...
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« on: April 03, 2008, 01:39:50 PM » |
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took the bus out today for a ride down to my local fishing haunt. and she stalled several times when i came to an abrupt stop?  |
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GostaBerling
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« Reply #1 on: April 03, 2008, 01:58:20 PM » |
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I'd check for vacuum leaks on the line to the brake booster. If it's leaking and you stomp on the brakes it can cause you to stall out.
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"I became an archaeologist because I wanted to drive around in a big Land Rover, smoking, cursing, and finding treasure." - Carmel Schrire Check out Willy's blog: Life and Adventures of a bus named Willoughby http://willoughbus.wordpress.com/ |
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olylawnboy
LoveMyBus Elite Radical
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Location: Oly Wa
Type: 68 Panel
Name: Winnie the Blue
Posts: 520
Long Live the Vw's...
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« Reply #2 on: April 05, 2008, 07:13:17 PM » |
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I'm just wondering here, and I don't have a break booster so I don't understand how a vacuum leak in the brake system would cause the engine to stall. Does it (vacuum) come off the carb or manifold? and the leak changes the air/fuel ratio because of too much or too little pressure for the carb or something like that? Maybe even the dizzy? I don't know. Like I said just wondering  |
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When I feed the poor, they call me a saint. When I ask why the poor have no food, they call me a communist. - Dom Helder Camara
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GostaBerling
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« Reply #3 on: April 05, 2008, 07:32:30 PM » |
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It does come off the the manifold. And that sounds about right Oly, but I don't fully understand how it affects it.
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"I became an archaeologist because I wanted to drive around in a big Land Rover, smoking, cursing, and finding treasure." - Carmel Schrire Check out Willy's blog: Life and Adventures of a bus named Willoughby http://willoughbus.wordpress.com/ |
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vdubyah73
LoveMyBus Elite Radical
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Location: Cape Cod, Mass
Type: 77 deluxe
Name: 3 of 7
Posts: 529
CHANGE THOSE FUEL LINES, ALL OF THEM.
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« Reply #4 on: April 06, 2008, 07:50:28 AM » |
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Long story short. Brake booster has a diaphram that separates atmospheric pressure from vacuum suction. When you step on the pedal the pressure differential between the 2 sides helps to push on the brakes. The vacuum has to be replaced after each time you step on the pedal. When you have a properly functioning power brake servo (booster), you may notice a barely perceptible change in idle. This is the booster demanding vacuum. The idle should return to normal almost instantly,even with the brakes still on, if not the booster is malfunctioning. If the booster or the vacuum lines suppling it leak, the intake system is getting unmetered air into the intake. In other words the engine is getting air that has not passed through the carbs or the AFM, there is no fuel in the mix for that extra air, the mixture goes lean because of it. At a stoplight with foot on the brake and a leaky booster the engine will stall, it's starving for gas because of the unmetered air (leak).
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landboat
LoveMyBus Radical
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Location: Staten Island N.Y.
Type: 72 Camper
Name: Harriette
Posts: 472
Topic starter
Long Live the Vw's...
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« Reply #5 on: December 05, 2008, 08:05:50 PM » |
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Well still having this issue and vdubyah explained very well why the bus is stalling, Now i need to no if i need a totally new/rebuilt servo? if not check valve? and how exactly do i know the diffrence? Also where are the hoses going to the carb? vaccum? Im clueless at this point... I did do the brakes over about three years ago. Changed the master cylinder,front calipers rubber and metal lines and front and rear pads/shoes. Front Disc / Rear Shoes. This year is when she started stalling when i stop short .She will idle at a light but i can hear a signifigant diffrence in idle almost ready to stall... Help???  |
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GostaBerling
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« Reply #6 on: December 05, 2008, 08:23:07 PM » |
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"I became an archaeologist because I wanted to drive around in a big Land Rover, smoking, cursing, and finding treasure." - Carmel Schrire Check out Willy's blog: Life and Adventures of a bus named Willoughby http://willoughbus.wordpress.com/ |
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vdubyah73
LoveMyBus Elite Radical
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Location: Cape Cod, Mass
Type: 77 deluxe
Name: 3 of 7
Posts: 529
CHANGE THOSE FUEL LINES, ALL OF THEM.
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« Reply #7 on: December 06, 2008, 06:47:54 AM » |
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While standing still, with engine running, what happens if you mash the brakes?
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landboat
LoveMyBus Radical
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Location: Staten Island N.Y.
Type: 72 Camper
Name: Harriette
Posts: 472
Topic starter
Long Live the Vw's...
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« Reply #8 on: December 06, 2008, 06:08:46 PM » |
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She won't stall but there's a significant change in the idle she will just putter @ bogg a bit. I have to give her a few revs before I put her in 1st @ take off...
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vdubyah73
LoveMyBus Elite Radical
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Location: Cape Cod, Mass
Type: 77 deluxe
Name: 3 of 7
Posts: 529
CHANGE THOSE FUEL LINES, ALL OF THEM.
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« Reply #9 on: December 07, 2008, 05:56:48 AM » |
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You definitely have a vacuum leak. It may or may not be your brakes causing the problem. It may be that you have another, or a couple small ones, when you step on the brakes it just becomes to much. I don't know what you have, FI or carb but you must check hoses for cracks and check gaskets at the manifold to head flange. If you find no other leaks it would be in your brake servo or the lines going up to it.
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landboat
LoveMyBus Radical
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Location: Staten Island N.Y.
Type: 72 Camper
Name: Harriette
Posts: 472
Topic starter
Long Live the Vw's...
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« Reply #10 on: December 09, 2008, 08:07:57 PM » |
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Thanks vdub will look into it tom. gonna be in the low 60s here in nyc it was 17deg. yesterday...
I do remember noticing hair line cracks on the heads when installing the exhaust sometime back.
I purchased new heads but never installed em do time restraints and the fact that i was still holding
quite good compression...May not be the case now... will give an update asap. This may be the issue?
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vdubyah73
LoveMyBus Elite Radical
Offline
Location: Cape Cod, Mass
Type: 77 deluxe
Name: 3 of 7
Posts: 529
CHANGE THOSE FUEL LINES, ALL OF THEM.
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« Reply #11 on: December 10, 2008, 01:56:04 PM » |
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Don't go tearing it all apart with out first checking all the hoses even remotely hooked to your carb(s) and manifold. Also check the large diameter ones that connect the 3 pieces of the intake manifold together. Then put a wrench on the nuts that hold the intake manifolds to the heads, all of them. Then let us know.
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