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Rjthj1 Samba Member
Joined: September 05, 2020 Posts: 12
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Posted: Sat Apr 16, 2022 6:36 am Post subject: T2 Type 4 engine shuddering- intermittent |
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Hi,
Every trip we have after about 15 mins in the engine starts violently shuddering, you would think it's fuel line related, and eventually it stops.
Yesterday it lasted for about 45 mins. When we stopped and idled the engine it was fine. When I depressed the clutch while driving it seemed fine. When dropping into third it seemed fine.
It has a new tank so now dirty. What's the problem? Any ideas greatfully received.
Thx |
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Starbucket Samba Member
Joined: April 30, 2007 Posts: 4006 Location: WA
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Posted: Sat Apr 16, 2022 7:41 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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When was the last time you looked at the sparkplugs? Carb.s or FI? |
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aeromech Samba Member
Joined: January 24, 2006 Posts: 16922 Location: San Diego, California
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Posted: Sat Apr 16, 2022 8:35 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Change the condenser _________________ Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound |
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Rjthj1 Samba Member
Joined: September 05, 2020 Posts: 12
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Posted: Mon Sep 26, 2022 7:41 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Right then.
Changed fuel filter, not changed plus or looked at them. Will do.
Also will look at the condenser
Thanks for the replies |
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airschooled Air-Schooled
Joined: April 04, 2012 Posts: 12686 Location: on a bike ride somewhere
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Posted: Mon Sep 26, 2022 9:35 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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You won't "see" anything wrong on a bad condenser, but you should swap it in pair with new points too. If that doesn't solve the problem, you'll have a known-good spare set of points/condenser, which is quite handy.
Robbie _________________ Learn how your vintage VW works. And why it doesn't!
One-on-one tech help for your Volkswagen:
www.airschooled.com |
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Rjthj1 Samba Member
Joined: September 05, 2020 Posts: 12
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Posted: Mon Sep 26, 2022 11:56 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Thanks Robbie |
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SGKent Samba Member
Joined: October 30, 2007 Posts: 41031 Location: Citrus Heights CA (Near Sacramento)
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Posted: Mon Sep 26, 2022 12:25 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Gary and Robbie are probably correct on this, but if this is a center mounted carb it could be carb or manifold icing. Moving into fall - 70 - 80F outside and humidity can have a low enough dew point in the air to cause icing. Also a fuel tank cap not venting properly can do the same thing. _________________ “Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin |
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Rjthj1 Samba Member
Joined: September 05, 2020 Posts: 12
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Posted: Mon Sep 26, 2022 1:01 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Thanks. I'm not so sure it could be icing. We have had unusually hot weather here this year. Fuel cap seems tight.
Will def check plugs, points, condenser.
This past weekend, the bus started off well enough, but then sure enough the trouble began on the motorway/freeway some 5 miles in.
This time however when going up a steep hill, after pushing the accelerator/ gas pedal to the floor the bus died. Started again all ok and pretty much carried on until destination.
On the way back same thing, apart from the stalling. I'd drop into third or depress the clutch. Then for 45 mins drove well! Even at near 70mph downhill. Nearly home at 30 mph and it started again.
Will hopefully sort at the weekend. |
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aeromech Samba Member
Joined: January 24, 2006 Posts: 16922 Location: San Diego, California
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Posted: Mon Sep 26, 2022 2:15 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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You can have carb icing in summer in Florida. Ask me how I know. _________________ Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound |
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dodger tom Samba Member
Joined: March 25, 2013 Posts: 1226 Location: Central Coast, CA, but we're all still Ukrainian
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Posted: Mon Sep 26, 2022 3:01 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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if all else fails, check the coil. _________________ 1978 Champaign Edition Westfalia
Would never find the time to keep up another classic air-cooled. |
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SGKent Samba Member
Joined: October 30, 2007 Posts: 41031 Location: Citrus Heights CA (Near Sacramento)
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Posted: Mon Sep 26, 2022 4:16 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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as fuel leaves the carb jets it cools the air, just like spraying water does on a hot day but more so. If the humidity is right that cooling forms ice out of the water vapor. It can be 105F outside and still get icing in an unheated carb or manifold. Center carbs on T4 engines are rarely heated. Dual carbs get more heat from the heads so they are not prone to it.
The fuel cap tight or loose has absolutely nothing to do whether it is venting or the tank venting system is working. If some wasp plugged the fuel tank vent on an earlier bay with a mud nest, the tank is not going to get air to replace the fuel so the tank gets a vacuum. Or a fuel pump could be weak, or the screen plugged, or you have a bad coil, or a bad connection, or the ignition switch is going out. All anyone here can do is make suggestions where to look based on years of other people with the same problems. If you just go, oh that couldn't apply to me, then you may live with this for a long time - or you may get lucky and find the problem right away. Don't be tempted to spend money throwing solutions at it. _________________ “Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51057 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Mon Sep 26, 2022 4:34 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Solid or hydraulic lifters? _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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Rjthj1 Samba Member
Joined: September 05, 2020 Posts: 12
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Posted: Mon Sep 26, 2022 11:24 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Morning. Please do remember that when it comes to engines or busses I'm an absolute novice. 😂
All feedback is 100% appreciated. The suggestions and detail that is being provided is awesome.
The whole Icing thing seems above my skill level for now. I'm going to start with replacing plugs, leads, points, condenser. That's prob gonna take me more than a few hours. Coil looks ok I think and from other experts input but will upload a pic.
Another thing I wanted to mention, it has a brand new fuel tank. And mid pandemic I had a severe fuel leak with the pipe just above the carb. Thankfully another enthusiast had a spare piece and it was replaced. Issues have also started since then. Could there be air somewhere? |
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Rjthj1 Samba Member
Joined: September 05, 2020 Posts: 12
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Posted: Mon Sep 26, 2022 11:36 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Xevin Samba Member
Joined: January 08, 2014 Posts: 7596
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Posted: Mon Sep 26, 2022 11:59 pm Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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Rjthj1 wrote: |
Morning. Please do remember that when it comes to engines or busses I'm an absolute novice. 😂
All feedback is 100% appreciated. The suggestions and detail that is being provided is awesome.
The whole Icing thing seems above my skill level for now. I'm going to start with replacing plugs, leads, points, condenser. That's prob gonna take me more than a few hours. Coil looks ok I think and from other experts input but will upload a pic.
Another thing I wanted to mention, it has a brand new fuel tank. And mid pandemic I had a severe fuel leak with the pipe just above the carb. Thankfully another enthusiast had a spare piece and it was replaced. Issues have also started since then. Could there be air somewhere? |
STOP!!!!!
Can you identify the carburetor you mentioned in your quote? Figure that out first. You might be surprised. When you add a part. Drive with it if you can. See if that makes a difference. Don’t just slap on five parts and hope for the best. It could be just a cracked or dirty distributor cap. One thing at a time. _________________ Keep on Busin'
67rustavenger wrote: |
GFY's Xevin and VW_Jimbo! |
Clatter wrote: |
Damn that Xevin... |
skills@eurocarsplus wrote: |
I respect Xevin and he's a turd |
SGKent wrote: |
My God! Xevin and I 100% agree |
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alman72 Samba Member
Joined: October 09, 2014 Posts: 2573 Location: MICHIGAN
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Posted: Tue Sep 27, 2022 4:29 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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yea, it used to be not as bad to fire the parts cannon, but "new" crap you get these days can just add to your woe. echlin points and condensor i believe are of fair quaility. bosch is bad these days. Seems part makers farm out production to cheapest bidder, and when you tell the parts guy the part was bad out of the box, he says he never had one come back like that! Bull.
always ask here what manufacturer to buy before you shop. you will be surprised what names used to be gold are now crap. |
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Jetfxr69 Samba Member
Joined: December 28, 2018 Posts: 1293 Location: White mtns nh
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Posted: Tue Sep 27, 2022 4:59 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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well we can stop all the carb solutions after seeing that pic. TSII if the ignition parts dont help. Ive also had more than one double relay with old weak coils in them cause erratic and intermittent running. Im not one for shotgun approach, but start with the easiest stuff first (ignition and fuel delivery), and if that doesnt help, onto FI controls. after TSII and relay verified good, check AFM wiper contact area.
welcome to the world of VW fuel injection. Its a P.I.T.A. right now, but resist the urge to rip it out for a carb conversion. Once its rectified, the FI is the way to go with these engines, IMHO of course. _________________ You can't be a real country unless you have a beer and an airline. It helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer. Zappa
‘77 westy Seamus
‘76 tintop Crusher
‘77 westy The Judge
‘72 tintop bastard westy Hudson |
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SGKent Samba Member
Joined: October 30, 2007 Posts: 41031 Location: Citrus Heights CA (Near Sacramento)
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Posted: Tue Sep 27, 2022 9:51 am Post subject: Re: T2 Type 4 engine shuddering- intermittent |
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you have a fuel injected engine. Add your location to your sig line or your avatar so we can offer best solutions.
New fuel tank statement concerns me. Hopefully it was a good used one because I think the FI tank reproductions don't have baffles in them. Low fuel levels can cause all sorts of problems of the pump sucking air without an internal FI baffle.
TSII suggestion is a good one too. _________________ “Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin |
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