Date: Wed, 25 Mar 2020 19:32:46 -0500
Reply-To: Mbob1950 <mbob1950@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mbob1950 <mbob1950@GMAIL.COM>
Subject: Re: O2 Sensor problem
In-Reply-To: <SN6PR10MB28949F7CB73F827CA6861529A0CE0@SN6PR10MB2894.namprd10.prod.outlook.com>
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Interesting. The one with 60psi did not have any fuel on vacc. Side. I'll check both of them again and the return line. Tank is new 4 years ago. Funny when I was replacing it the first tank they sent me had the return line blocked off inside the tank, which I found after installing it.
LOL
THANKS
Bob
http://idiopath2017.wordpress.com
http://idiopath2018.wordpress.com
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https:/idiopath2020.wordpress.com
> On Mar 25, 2020, at 18:25, Dennis Haynes <d23haynes57@hotmail.com> wrote:
>
> It is not likely for a FP regulator to fail supplying excessive pressure. Look for a restriction, kink, something inside the return line to the tank. Basically a spring loaded diaphragm. If the spring should break pressure drops. The usual failures I’ve seen are rust outs and the diaphragm filling the manifold with fuel.
>
> Dennis
>
>
> From: mccullough bob [mailto:mbob1950@gmail.com]
> Sent: Wednesday, March 25, 2020 7:03 PM
> To: Dennis Haynes <d23haynes57@hotmail.com>; vanagon@GERRY.VANAGON.COM
> Subject: Re: O2 Sensor problem
>
> Their is no fuel in hose. The regulator on it earlier was running 60psi and I swapped on a good used one. Sensor is blue and followed the graph in bently. I also substituted a resistor to mimic hot water and saw no change.
> I pretty sure I checked that voltage at 0 but ill check again later. I have gone thru and replaced or freshen upped a few wires in engine bay. Ill be checking more.
> Gonna check the lifter and valves again first.
>
> Thanks
>
> Bob
>
>
>
> http://idiopath2020.wordpress.com
> https://idiopath2019.home.blog
> http://idiopath2018.wordpress.com
> https://idiopath2017.wordpress.com
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> On 25, Mar2020, at 5:52 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
>
> Pull vacuum hose off fuel pressure regulator. Make sure there is no fuel there. That is the only real way those regulators fail. Leaking diaphragm adding fuel to the manifold. Make sure temp 2 sensors are not swapped with gauge sensor. Blue for ecu, black for gauge.
> For the shield on the O2 sensor lead, don't just check with ohm meter, with ignition on measure for voltage to ground. Don't discount problem in the FI harness.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of mccullough bob
> Sent: Wednesday, March 25, 2020 6:42 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: O2 Sensor problem
>
> (With meter on sensor and ground connect battery between ground and sensor input and you should see the mixtre go lean and the O2 sensor voltage drop accordingly. If not something else is wrong)
>
>
> from the voltage test, engine at running temp, 02 heater and sensor disconnected sensor 0.91v ecu 1.6v (aa cell connected)
>
> 1.6v cell removed sensor 0.91 ecu 0.43 v
>
> sensor 0.86-0.91 v with ecu grounded
>
> I changed the plugs got fire on all of them I checked all the injectors, no dribbling under pressure and normal spray pattern At idle I am getting a miss fire occasionally and Ive got at least one lifter that hasn't pumped up.
> Im going to check those out again next. I think their is something else going on as you said.
>
> Thanks for all the Knowledge.
>
>
> Bob
>
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> On 24, Mar2020, at 8:41 PM, Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
>
> With meter on sensor and ground connect battery between ground and sensor input and you should see the mixture go lean and the O2 sensor voltage drop accordingly. If not something else is wrong. Could even be a bad injector.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com
> <mailto:vanagon@gerry.vanagon.com>] On Behalf Of mccullough bob
> Sent: Tuesday, March 24, 2020 9:29 PM
> To: vanagon@GERRY.VANAGON.COM <mailto:vanagon@GERRY.VANAGON.COM>
> Subject: Re: O2 Sensor problem
>
> OK
> New o2 sensor installed and it doing exactly the same as before.
> With engine warm and running and o2 sensor connected, Ive got 0.92 v sensor to ground. Does not come down and engine stumbling on throttle open.
> Disconnected sensor heater and sensor voltage slowly come down to 0.45v and stumbling goes away.
> Engine off, Green sensor wire disconected. It looks good and has no continuity to ground or shield. It has continuity to pin 2 ecu.
> Shield is grounded to distributor ground.
>
> While running I plugged the heater back in and the sensor voltage
> started to climb slowly to 0.92 v
>
> Ive refreshed the grounds on firewall and side recently but am going through them again.
>
> Dennis
> If testing with a dry cell battery how do i tell its going lean or rich? Engine running? Check voltage sensor to ground?
>
>
>
> Thanks
> Bob
>
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> On 23, Mar2020, at 4:26 AM, David Beierl <dbeierl@GMAIL.COM> wrote:
>
> ---------- Forwarded message ---------
> From: David Beierl <dbeierl@attglobal.net>
> Date: Mon, Mar 23, 2020 at 5:26 AM
> Subject: Re: O2 Sensor problem
> To: Dennis Haynes <d23haynes57@hotmail.com>
> Cc: vanagonlist a <vanagon@gerry.vanagon.com>
>
>
> Rarely will an O2 sensor go over 1 volt so what happens is that even
> after
>
> the O2 sensor is saturated and reaches its limit the ecu is still
> trying to go rich until it sees something.
>
>
> High voltage signals rich and should drive the ECU lean. However I
> think the programmers must have anticipated the possibility of heater
> element leaking to the sensor, because this condition in fact drives
> the ECU rich just as does a sensor line shorted to ground does.
>
> Yrs,
> d
>
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