| Author |
Message |
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
 Posted: Sun Jun 01, 2014 3:21 pm Post subject: 78 type 2 will not idle and stalls when warm (solved!!) |
 |
|
Been doing some work on my sons 78 trying to get it more reliable with him heading to college next year. It starts and runs fine when cold but after it warms up it stalls and will not idle.
I have checked for vacuum leaks and found none. I am at a loss as to where to go next. Any suggestions?
Last edited by Bob63 on Sat Jun 14, 2014 11:28 am; edited 3 times in total |
|
| Back to top |
|
 |
busdaddy
Samba Member
Joined: February 12, 2004
Posts: 53222
Location: Surrey B.C. Canada, but thinking of Ukraine
|
| Posted: Sun Jun 01, 2014 3:44 pm Post subject: |
|
|
Start with the temp sensor 2, clean the threads and confirm it's tight as well as making a good electrical connection, trying your spare one you keep in the glove box wouldn't be a bad idea either.
_________________
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! |
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Sun Jun 01, 2014 4:02 pm Post subject: |
|
|
| busdaddy wrote: |
| Start with the temp sensor 2, clean the threads and confirm it's tight as well as making a good electrical connection, trying your spare one you keep in the glove box wouldn't be a bad idea either. |
So I should keep a spare one in the glove box. Good advice. I will give it a try. |
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Fri Jun 13, 2014 10:20 am Post subject: |
|
|
Change out the temperature sensor II and while doing that noticed that the intake manifold gasket was cracked. I changed those too and also the fuel injector seals.
It is running great now. Funny how digging into one thing makes you find multiple things that need replaced. Glad I did it though and nothing was too expensive so that's a bonus. |
|
| Back to top |
|
|
SGKent 
Samba Member
Joined: October 30, 2007
Posts: 42961
Location: at the beach in Northern Wokistan
|
| Posted: Fri Jun 13, 2014 12:07 pm Post subject: |
|
|
| Bob63 wrote: |
Change out the temperature sensor II and while doing that noticed that the intake manifold gasket was cracked. I changed those too and also the fuel injector seals.
It is running great now. Funny how digging into one thing makes you find multiple things that need replaced. Glad I did it though and nothing was too expensive so that's a bonus. |
FWIW about 5 years ago someone sold me a whole 1978 FI set in a box that had come off their bus because their mechanic could never get the FI to run right. The fix he recommended was they install a carb, which they did, and then they sold all the FI parts they took off their bus. All that was wrong with the FI system when I got it was that the injector seals were dried out and falling apart. Kudos to you for taking the time to check it and look it over. |
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Fri Jun 13, 2014 1:18 pm Post subject: |
|
|
I wasn't going to put it back together without having good parts in it. I thought i had the issue handled but now it is acting up again when hot. A 5 minute trip on the expressway and it won't keep idle and stalls.
not sure where to look next. I swear I hear a vacuum leak behind the throttle body but can't find anything. Any suggestions welcome. |
|
| Back to top |
|
|
Randy in Maine
Samba Member
Joined: August 03, 2003
Posts: 34890
Location: The Beach
|
| Posted: Fri Jun 13, 2014 1:24 pm Post subject: |
|
|
| There should be a seal between the throttle body and the air plenum. Also make sure that the throttle body is evenly attached with those 2 screws that hold it on. |
|
| Back to top |
|
|
busdaddy
Samba Member
Joined: February 12, 2004
Posts: 53222
Location: Surrey B.C. Canada, but thinking of Ukraine
|
| Posted: Fri Jun 13, 2014 2:21 pm Post subject: |
|
|
It's also worth removing the rubber S boot and carefully looking it over for cracks. Easier to see that throttle body seal while it's out too.
_________________
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! |
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Fri Jun 13, 2014 4:34 pm Post subject: |
|
|
Removed the throttle body and the seal looked distorted and could be the issue. Didn't have a new one laying around so i tried using some high temp rtv around it and I don't believe I hear the leak anymore. Will get one on order in the meantime.
Bad news is it still is idling rough and stalling when it is warm. Checked the S boot too and it checks out fine. |
|
| Back to top |
|
|
busdaddy
Samba Member
Joined: February 12, 2004
Posts: 53222
Location: Surrey B.C. Canada, but thinking of Ukraine
|
| Posted: Fri Jun 13, 2014 4:53 pm Post subject: |
|
|
Likely more leaks to be found, keep looking. In the meantime have you tested the fuel pressure yet?
_________________
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! |
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Fri Jun 13, 2014 5:20 pm Post subject: |
|
|
| Haven't tested the fuel pressure yet. Sounds like a good project for tomorrow. |
|
| Back to top |
|
|
aerosurfer
Samba Member
Joined: March 25, 2012
Posts: 1603
Location: Indianapolis, IN
|
| Posted: Sat Jun 14, 2014 5:32 am Post subject: |
|
|
Its a little premature yet to be messing with the AFM, but with the leaks you just fixed and potentially are about to, likely in a previous life the AFM was adjusted rich(er) to compensate for that. Now that they are sealed up again you are running too rich and need to lean it out. Have you looked at your spark plugs yet?
Have you downloaded the AFC guides yet?
http://www.thesamba.com/vw/archives/manuals/fuelinjection.php
Or the excellent color tutorial;
http://www.itinerant-air-cooled.com/viewtopic.php?f=50&t=7761
_________________
Rebuild your own FI Harness..My Harness
77 Westy 2.0L Rockin and Rolling Resto!
72 Sportsmobile (sold)
79 Tran$porter... Parts car money machine (gone) |
|
| Back to top |
|
|
Joey
Samba Member
Joined: August 12, 2005
Posts: 5376
Location: Nova Scotia - Canada
|
| Posted: Sat Jun 14, 2014 5:51 am Post subject: |
|
|
Since his problem is only at idle the idle mixture screw should only need adjusting... and this is only after he's sure all other problems are fixed.
_________________
Joey
‘60 Kombi - '74 Bus - '79 Panel - '65 Beetle |
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Sat Jun 14, 2014 11:32 am Post subject: |
|
|
Well finally got it all solved. Checked the fuel pressure and everything checked out fine. Fixed several vacuum leaks and then changed the distributor cap, rotor and points. Runs like a champ now! Probably the best it ever has.
Thanks for all the suggestions and input. I know am more versed on this engine and hope to keep it running for several more years now. Now to get that BA6 heater bench tested and installed. |
|
| Back to top |
|
|
SGKent
Samba Member
Joined: October 30, 2007
Posts: 42961
Location: at the beach in Northern Wokistan
|
| Posted: Sat Jun 14, 2014 12:25 pm Post subject: |
|
|
| Bob63 wrote: |
Well finally got it all solved. Checked the fuel pressure and everything checked out fine. Fixed several vacuum leaks and then changed the distributor cap, rotor and points. Runs like a champ now! Probably the best it ever has.
Thanks for all the suggestions and input. I know am more versed on this engine and hope to keep it running for several more years now. Now to get that BA6 heater bench tested and installed. |
Hi Bob - was thinking about this thread and thought I might contribute something. Many years ago my ex-wife, Linda and I bought a 1971 sunroof deluxe. We wanted to haul the kids around as well as be able to get better fuel mileage than the big American vans at the time, which were getting 8 - 10 MPG. I had worked on cars quite a bit, including some racing but the VW air cooled engine, and drive train were over my head. The first thing I did was buy the John Muir book, immediately followed by the factory service manual, and read the chapters starting with regular maintenance. I also read the owner's manual cover to cover. Linda let me keep the factory manual near the coffee table and when TV was boring I'd read a few pages and look at the photos. Over time it sunk in and working on the bus became quite easy. In 1980 we divorced, and the bus went with me. It was sold in 1984 - still running and maintained like a new bus. In 2000 I started dreaming of owning a bus again, and in 2008 we finally found a 1977 sunroof deluxe barely worth restoring. Today we love it, and like the 1971, it is like a new bus. The secret is that the first thing I did this time is buy the Bentley manual, which is the same as the factory manual in 1971. The only difference is that the photos are dot matrix so they don't have the detail, and the wiring is black and white instead of color. One can find 1979 +/- copies of the Bentley that are the better photo style and have colored wiring. There is also the VW of Germany manual which has some additional photos and procedures, as well as a large fold out wiring diagram. We have color wiring diagrams here on the Samba that can be printed on large paper too. If you don't have a Bentley manual, or haven't had the time to read thru it, it is a really good place to start learning all these procedures. My guess is that 75% of the new problems that are posted here in the Bay forum have their answers in the manual - whether it was a PO who ignored them or their mechanic. Given time, almost any bus owner can become quite proficient in maintaining their bus if they have the time and desire to read thru the factory manual. It sounds like you may have already found it based on the quality of the repairs you just completed.
Enjoy your bus and keep an eye on those valve adjustments.
[img][/img] |
|
| Back to top |
|
|
Tcash
Samba Member
Joined: July 20, 2011
Posts: 12843
Location: San Jose, California, USA
|
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Sun Jun 15, 2014 7:25 pm Post subject: |
|
|
Since I wasn't working on the motor today I had time to get her cleaned up and thought I add a few pics.
[/img] |
|
| Back to top |
|
|
Randy in Maine
Samba Member
Joined: August 03, 2003
Posts: 34890
Location: The Beach
|
| Posted: Mon Jun 16, 2014 3:26 pm Post subject: |
|
|
| Sweet looking bus! I would keep it and give him the Chevy. |
|
| Back to top |
|
|
secretsubmariner
Champagne Wrangler
Joined: January 08, 2011
Posts: 3111
Location: Tulsa, OK
|
|
| Back to top |
|
|
Bob63
Samba Member
Joined: November 04, 2012
Posts: 29
Location: USA Ohio
|
| Posted: Mon Jun 16, 2014 6:13 pm Post subject: |
|
|
| Randy in Maine wrote: |
| Sweet looking bus! I would keep it and give him the Chevy. |
The Chevy is my other son's. Getting ready to drop a new motor in that next month. That is why I needed to get the bus problems handled and hopefully get the BA6 heater running in the next few weeks.
I just get to cruise around in my '10 VW Jetta. I am trying to convince him to take the Jetta and I can take the bus. |
|
| Back to top |
|
|
|
