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I have an intermittent problem that leaves me with getting the Van towed. ?

82 Westy diesel?
2001 Subaru Outback limited automatic intake on EJ253 engine?

Van drove good for about 5 miles then started to lose power on the highway. Pulled over and engine pulsates and wants to stall when letting out clutch to start moving. ?Sometimes it will smooth out and idle correctly for a few seconds.?

Scanned codes at the side of the road. ?I had evap and a cat converter inefficient code. Will monitoring the live data of the sensors I saw that the speed sensor was saying 158.6MPH.?

Had it towed home and hooked up the scanner again. ?I noticed when the engine is pulsating all of the sensors are all over the place. ?I will upload screen shots of the sensor readings that were taken one after another as fast as the phone would take them. ?

I am thinking the ecu might be bad. Any thoughts??

I have uploaded a video of the pulsing engine on youtube?

Thank you?
? ? ? Scott Wolfe

?

Another thing I noticed was the evap codes and cat codes were present at the side of the road and I did not clear them. I came home and rescanned the codes and a misfire, throttle position, and turbo charge codes were present and the other codes vanished. I did not clear them. Now the evap codes, and cat codes are back and the misfire, throttle position and turbo charge codes are gone with out clearing them. Another reason I believe the ecu is bad.
I did not check the voltage to the ecu yet to verify if the erratic voltage reading coming from the ecu and shown in the screen shots is actually present at the ecu or not.

Thank you
Scott

Green test connectors are disconnected? 158 mph doesn't sound right. What VSS is it? Neutral switch to the ECU is grounded?

All,
There are no green plugs connected together.
This is not a new project. I converted this van about 8 years ago and it ran well for years. I had this happen to me last year with the same issues. I had it towed home and the van ran fine once it got home about three hours later. I could not make the issue reoccur to troubleshoot after it got home. I did not have this issue for another 500 miles until today. I keep the van in the garage and only drive it during spring summer and fall when weather permits.
Last year I had a knock sensor code when this happened and I changed that out hoping that was the issue. I do not have that code now.
The speed sensor is a Rocky Mountain Westy proximity type that mounts by the rear drive axel and has a disc with teeth mounted to the drive axel. This has been installed for 8 years.

Thanks
Scott

Engine ground to the intake manifold? This is where the ECU gets its ground. ECU can do weird things so I've read. I had an extra ground from the harness to the chassis near my ECU.

All,
After disconnecting the Blue signal wire from the VSS and I started the van, it idled correctly. Then I hooked up the scanner and verified that the ecu was registering 0mph. I connected the wires and waited for the ecu to report 158mph again which took about two minutes for it to get up there. It was still idling correctly at 158mph. Then I had my son press the accelerator and it wanted to die and stall. Foot off the gas and it still wanted to idle erratically with wires connected. When I released the wire connection the van idled correctly again. We repeated the test a few times with the same results.
I would say it is a Vehicle speed sensor issue.

Thanks
Scott

Anyone know of a source for this style sensor replacement? I remember years ago someone sending a link of sensors on eBay for around $15. I believe it is just some kind of proximity sensor.

Thank you
Scott

look for proximity sensor on Amazon might be your best bet for timely arrival.

All,
I assume the proximity sensor that I am looking for should be an inductive type. There are NPN normally open, NPN normally closed, PNP normally open, and PNP normally closed options. Can someone confirm what style sensor I would need to source.

Thank you
Scott

. This should be an exact replacement for what you have in van currently if it was done by RMW.

Also, .

I have no experience with this vendor but they appear to have it for a cheaper price.?

The RMW replacement ($46 US!) says it's a sinking open collector whatever that means. What I got to work with a Smallcar damaged CV ring was a PNP (NO I think) original Littlefuse sensor, that pulses a signal with magnet contact. I had no luck with a NPN sensor that pulled the signal voltage to ground on magnet contact.

This might help:??https://www.omch.co/npn-and-pnp-proximity-sensors/