| Author |
Message |
Surfwagon
Samba Member
Joined: June 29, 2020
Posts: 42
Location: San Diego Area
|
 Posted: Mon Apr 12, 2021 4:32 pm Post subject: Van dies coming from highway speed to stand still ('89 WBX) |
 |
|
Hi,
I've used the search bar and can't find anything that matched to what is happening.
I have an '89 Westy stock 2.1 and when I'm coming off the high way and slow down to a halt the rpm's drop too low and it turns off. Problem is worse if I just throw in the clutch and the rpm's drop from 4k. Its like its not holding the idle when it drops from that high.
When I come in slowly and put in the clutch slowly at 1k sometimes it helps but sometimes I see the rpm go passed 800 and the van off. If I'm still moving I'll take out the clutch and kick start myself and I'm good to go.
I'm hoping you all can tell me how I can play with the idle screw or do I need to look at a new idle control unit?
All the best and thanks in advance,
FG |
|
| Back to top |
|
 |
mikemtnbike
Samba Member
Joined: March 26, 2015
Posts: 2795
Location: North Carolina
|
| Posted: Mon Apr 12, 2021 4:41 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Throttle position switch is my guess. Good videos on YouTube for checking and adjusting it.
_________________
1991 Vanagon GL 2.1 AT Westfauxlia. "Frankie" Totaled  https://www.thesamba.com/vw/forum/viewtopic.php?t=764510&highlight=carnage
1995 Eurovan Camper "Marzivan"
2020 GTI SE manual |
|
| Back to top |
|
|
Steve M.
Samba Member
Joined: July 30, 2013
Posts: 6829
Location: Fort Lauderdale, Fl.
|
| Posted: Mon Apr 12, 2021 5:09 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Do not play with the idle adjustment screw or the "limit screw" . These are not the problem
The Throttle position screw is a likely suspect.
With the engine off move the throttle by hand and listen for the click of a switch mounted on the bottom side of the throttle body.
Basically almost as soon as you open the throttle you should hear the switch click.
If you're in a noisy area do it around 3am so you can hear it! (joking)
When you come to idle the switch closes and opens when you step on the gas.
It closes again when you are at wide open throttle.
Between Idle and Full Throttle it is open
I think it is a 3mm Allen wrench to adjust it. Do not use one of the ball-end Allen Wrenches. Use one with sharp new ends so that the Allen wrench does not slip and start stripping the bolt.
It is a good idea to clean out the bolt head so the Allen Wrench goes in all the way.
_________________
This free advice is worth exactly what you paid for it.
There are seven days in a week. Someday is not one of them. |
|
| Back to top |
|
|
Surfwagon
Samba Member
Joined: June 29, 2020
Posts: 42
Location: San Diego Area
|
| Posted: Mon Apr 12, 2021 5:14 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Steve, Mike
Thank you! I'll check out that screw just have to wait for 10 more hours for 3am (also joking).
I'll post back this week to see if that helped.
Best,
FG |
|
| Back to top |
|
|
djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32576
Location: Reading Pennsylvania
|
|
| Back to top |
|
|
mikemtnbike
Samba Member
Joined: March 26, 2015
Posts: 2795
Location: North Carolina
|
|
| Back to top |
|
|
Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50336
|
| Posted: Mon Apr 12, 2021 6:10 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
| If the TPS doesn't close under decel conditions it can cause the engine to foul, especially if combined with a thermostat that is stuck open causing the engine to run too cool or with a weak ignition for whatever reason. |
|
| Back to top |
|
|
Surfwagon
Samba Member
Joined: June 29, 2020
Posts: 42
Location: San Diego Area
|
| Posted: Mon Apr 12, 2021 6:52 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Dave good call on not flying blind, god knows I've made that mistake before.
Mike thanks for the video, it's easy to understand and with the old blues blog post I feel like I know what to do.
Wild, my van does run cool (lower end of the limits) *knock on wood* and it happens most before the engine has warmed up so with that and all the great insights given to me, I feel like I am on the right track.
I should have time tonight to check it out.  |
|
| Back to top |
|
|
Surfwagon
Samba Member
Joined: June 29, 2020
Posts: 42
Location: San Diego Area
|
| Posted: Tue Apr 13, 2021 3:38 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Hi everyone,
I took a video of the clicking test. I have made no modifications but it did turn off twice in 140 miles today.
https://youtu.be/rlC10e_eueM |
|
| Back to top |
|
|
Surfwagon
Samba Member
Joined: June 29, 2020
Posts: 42
Location: San Diego Area
|
| Posted: Tue Apr 13, 2021 3:49 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Also I’m seeing what I believe is low resistance.
|
|
| Back to top |
|
|
Steve M.
Samba Member
Joined: July 30, 2013
Posts: 6829
Location: Fort Lauderdale, Fl.
|
| Posted: Tue Apr 13, 2021 4:09 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Think you are at this point here if you do not already have it downloaded!
https://www.thesamba.com/vw/forum/viewtopic.php?t=725680
It is not a bad idea to make the diagnostic steps in an Excel form and either print them or tranfer it to Google Sheets to use on a Tablet to write down your readings.
_________________
This free advice is worth exactly what you paid for it.
There are seven days in a week. Someday is not one of them. |
|
| Back to top |
|
|
Steve M.
Samba Member
Joined: July 30, 2013
Posts: 6829
Location: Fort Lauderdale, Fl.
|
| Posted: Tue Apr 13, 2021 4:10 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Somebody's going to jump on you for your Alternator cables!
_________________
This free advice is worth exactly what you paid for it.
There are seven days in a week. Someday is not one of them. |
|
| Back to top |
|
|
Steve M.
Samba Member
Joined: July 30, 2013
Posts: 6829
Location: Fort Lauderdale, Fl.
|
| Posted: Tue Apr 13, 2021 4:17 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
If you happen to have an old connector for a Fuel Injector or the Temp ll sensor it makes a good test fitting if you put butt connectors on the wires.
It's easier then trying to hold the probes on the blades in the connector.
Terminals 6 & 11 @ ECU
Throttle Switch TPS
Closed 0 Ohm's
Idle Infinite Ohm's
Full Throttle 0 Ohm's
_________________
This free advice is worth exactly what you paid for it.
There are seven days in a week. Someday is not one of them.
Last edited by Steve M. on Tue Apr 13, 2021 4:25 pm; edited 1 time in total |
|
| Back to top |
|
|
Surfwagon
Samba Member
Joined: June 29, 2020
Posts: 42
Location: San Diego Area
|
| Posted: Tue Apr 13, 2021 4:22 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
Thanks,
I actually replaced the temp II sensor that when I changed the harness maybe 3 weeks ago. (This problem was before the harness change.)
And don’t worry alternator wires are on the to do list for sure! |
|
| Back to top |
|
|
Steve M.
Samba Member
Joined: July 30, 2013
Posts: 6829
Location: Fort Lauderdale, Fl.
|
| Posted: Tue Apr 13, 2021 4:31 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
_________________
This free advice is worth exactly what you paid for it.
There are seven days in a week. Someday is not one of them. |
|
| Back to top |
|
|
djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32576
Location: Reading Pennsylvania
|
|
| Back to top |
|
|
djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32576
Location: Reading Pennsylvania
|
|
| Back to top |
|
|
Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50336
|
| Posted: Wed Apr 14, 2021 4:40 am Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
| When slowing down, you should be able to feel the engine go into the decel mode (zero fuel) when you remove your foot from the accelerator pedal at higher RPM and then feel the engine begin to get fuel again as the rpm drops to near idle. |
|
| Back to top |
|
|
90Doka_Guy
Samba Member
Joined: April 08, 2007
Posts: 548
Location: South Jersey
|
| Posted: Wed Apr 14, 2021 5:05 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
I have had similar symptoms on my doka in the past. Engine would die when clutching in coming to a stop. I took out the idle control valve and cleaned it out with some carb cleaner. That did the trick. Not saying that is your cause, but giving it a cleaning is easy enough. My cleaning consisted of liberally squirting carb cleaner in the ports and letting dry.
_________________
-'87 Westy
-'90 Tintop
-'90 DOKA |
|
| Back to top |
|
|
4Gears4Tires
Samba Member
Joined: October 08, 2018
Posts: 3019
Location: MD
|
| Posted: Wed Apr 14, 2021 8:48 pm Post subject: Re: Van dies coming from highway speed to stand still ('89 WBX) |
|
|
It's not broken until it's clean and broken! 
_________________
'87 Syncro
Ferric Oxyhydroxide Superleggera Edition |
|
| Back to top |
|
|
|
