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VVWC :: View topic - New 1991 Vanagon funky power loss/stalling issues. Help!!
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New 1991 Vanagon funky power loss/stalling issues. Help!!
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samander
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PostPosted: Tue Aug 30, 2016 5:12 pm    Post subject: New 1991 Vanagon funky power loss/stalling issues. Help!! Reply with quote

Hey all, Just got myself a new (to me) 1991 Vanagon Westfalia a couple months back and am pulling my hair out trying to figure out an issue I am having. Very randomly (maybe once a week) I will take it out and after a couple km of driving, it will lose power and eventually stall out. Here is a sequence of events:

- With foot on gas it will only go to about 2500 rpm, lose power and sputter out. Pumping of gas will keep it barely running until I pull over.
- If at light and it occurs the idle will go downhill and will eventually stall.
- I turn the engine off and on a couple times and suddenly its back to life with no issues for rest of day!
-Often (maybe always) when this condition occurs the engine starts with a ticking sound which I assume is the famous Vanagon lifter noise. It will go away with a drive. Not convinced these are related but good to know


I have replaced the hall sender, checked and cleaned engine bay grounds, checked timing, replaced rotor, spark plugs, distributor cap.

My thoughts are that perhaps the engine/coolant is reaching a certain temperature and then sending mixed signals to ECU, perhaps fuel mixture, and causing it to lose power and stall. But why is this not a consistent issue?

If anyone has ideas/comments I would love to hear them. Thanks in advance!
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OldSkoolSteve
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PostPosted: Tue Aug 30, 2016 7:09 pm    Post subject: Reply with quote

Possible tank rust.
check the fuel quality from the tank.

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samander
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PostPosted: Tue Aug 30, 2016 9:51 pm    Post subject: Reply with quote

Is there a method you can recommend to do that? I am thinking I should also replace the fuel filter and temp II sensor as they are easy cheap potential solutions.
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haywirebutton
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PostPosted: Tue Aug 30, 2016 10:37 pm    Post subject: Reply with quote

start by changing the fuel filter before you throw anymore parts at it
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Wongai
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PostPosted: Wed Aug 31, 2016 1:25 pm    Post subject: Reply with quote

I have an idea. I'm just idiot checking my thoughts. If I feel it is helpful, I'll post it shortly.
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Wongai
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PostPosted: Wed Aug 31, 2016 1:32 pm    Post subject: Reply with quote

PM Sent.

Let's get together and sort this out!
We will post hopefully positive results.

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ranchhand7
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PostPosted: Wed Aug 31, 2016 6:45 pm    Post subject: re engine shutting down Reply with quote

https://www.busdepot.com/071906059 Another thing to check, I had a 1981 Vanagon, did similar stuff. Ended up being the fuel relay. Shutting off power to the fuel pump. Overtime the solder was letting go of the connections inside the relay. Sometimes it worked for a long time, then also would shut me down exactly as you described on your van. A friend of mine took it apart and resoldered the connections, worked again as it should. Or see Bowwow for a new one.
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samander
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PostPosted: Mon Sep 05, 2016 9:19 am    Post subject: Reply with quote

Thanks for the help guys. So I checked my records and looks like the fuel filter was replaced with a Chinese one so replaced it with the Bosch just in case. Since I disconnected the o2 sensor last week the issues havent come up since. I may re connect it now that the filter is in and see what happens.
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Greg
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PostPosted: Mon Sep 05, 2016 7:13 pm    Post subject: Reply with quote

It could also be a failing coil or fubared plug wires. Have you replaced any of those?
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ranchhand7
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PostPosted: Thu Sep 15, 2016 3:02 pm    Post subject: Reply with quote

Soooo, what were the results? Would help others to know the outcome. Smile
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samander
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PostPosted: Thu Sep 15, 2016 4:27 pm    Post subject: Reply with quote

Hey Guys, Here is an update! I have been running the van without the 02 sensor since I last reported here and haven't had a single issue....Although this is great it is also opening a big can of worms as it could still be multiple things. I guess first thing should be to check for exhaust leaks again, does anybody have any other suggestions? Cheers!
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samander
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PostPosted: Tue Sep 27, 2016 4:37 pm    Post subject: Reply with quote

Another update! I replaced the muffler, gaskets and bolts up to the collector pipe, checked for leaks, and reconnected the 02 sensor and the issue came back and worse than before. Im beginning to think that maybe the 02 sensor is the culprit here. What are your thoughts?
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haywirebutton
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PostPosted: Tue Sep 27, 2016 9:57 pm    Post subject: 02 Reply with quote

if it runs ok unplugged ECU default O2 in open loop and like a gutless bag of shit plugged in then you are probably losing your sig voltage to grnd when at operating temp . Replace the sensor or build an 02 simulator....The microswitch in the TPS can cause similar symptoms as well but probably your O2 sensor sig is shorting to ground when hot. An O2 simulator could run 0.5-0.7v should you decide to build one
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samander
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PostPosted: Wed Sep 28, 2016 8:05 pm    Post subject: Reply with quote

I decided to go with the replacement route, but of course while trying to remove the old sensor with heat and penetrating oil I managed to shear it off. Went out and bought an extractor but had no luck. tried to grind down the remainder with a Dremel to make it bendable so I could pop it out but no luck. Does anyone have any suggestions here?
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Wongai
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PostPosted: Thu Sep 29, 2016 8:52 am    Post subject: Reply with quote

I know it's a pain, but if you post a pic, we can offer better advice.

I'm not really sure what you are up against.

Thanks!
Byron
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