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Date:         Tue, 25 Feb 2014 18:00:32 -0600
Reply-To:     mcneely4@COX.NET
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dave Mcneely <mcneely4@COX.NET>
Subject:      Re: Engine Starting Problem
Comments: To: OlRivrRat <OlRivrRat@COMCAST.NET>
In-Reply-To:  <Wn2B1n01508X5Fr01n2FKB>
Content-Type: text/plain; charset=utf-8

Hmmm..... . My 1991 Volkswagen Vanagon GL Campmobile original 2.1 L waterboxer engine exhibits this phenomenon year round. I am reluctant to use a lighter weight oil, whether multi-grade or single grade, than the 20W-50 that I use in summer. I want that -50. Before I installed an external oil cooler (Ten Cent Life), whenever I pulled off the highway after a long run in hot weather, the idle oil pressure would drop below 5 psi, enough for the oil light to come on at idle. Please don't tell me that ambient temperature does not affect oil pressure when the engine is hot. I realized very graphically that it does when I drove into a thunderstorm on Raton Pass from 105 F ambient to 45 F ambient quite suddenly. The oil pressure rose quickly from around 25 psi to around 55 psi. Same gear, same speed.

Since the lifter clatter stops quickly after I drive a block or so (or let the engine idle a few minutes if it is really cold out), I don't worry about that.

mcneely

---- OlRivrRat <OlRivrRat@COMCAST.NET> wrote: > If you Switch to a 10 or 5 or even 0W** Oil that ColdLifterSyndrome will most probably be diminished or > > may even go away completely ~ > > ORR ~ DeanB > > > On 25 Feb , 2014, at 2:58 PM, Steven Shelton wrote: > > > I drove it around for a while and now the noise is tolerable. I'd never > > heard it that loud. I let the oil drain overnight before I refilled it; > > maybe that had something to do with it. > > > > Well, I spent half the day trying to fix a starting problem, didn't find > > anything wrong, and now it starts fine. Not very satisfying. Thank you > > all for your suggestions, though. Just knowing there are people out there > > with a lot more knowledge than I have gives me the confidence to attempt > > these repairs. > > > > > > On Tue, Feb 25, 2014 at 3:59 PM, JRodgers <jrodgers113@gmail.com> wrote: > > > >> Having a Mann oil filter will help prevent this. > >> > >> > >> John > >> > >> On 2/25/2014 2:28 PM, Steven Shelton wrote: > >> > >>> This is turning into a real nightmare. I reinstalled the AFM; now it > >>> starts fine, but the engine makes a loud clattering! It's done this > >>> occasionally over the years, but always went away pretty quickly. Now it > >>> won't stop. I've gone over it with a stethoscope and it seems to be > >>> loudest at the driver's side of the intake air distributor, but it's hard > >>> to pinpoint. I disconnected the fuel injector plugs and cranked the > >>> engine > >>> to see if something was bouncing around in a cylinder, but heard nothing. > >>> Can all this be related? It all started off with a shorted oil pressure > >>> sensor wire. > >>> > >>> > >>> On Tue, Feb 25, 2014 at 2:25 PM, Dennis Haynes <d23haynes57@hotmail.com> > >>> wrote: > >>> > >>> Intermittent problems are often elusive. Will it start reliably with the > >>>> AFM > >>>> disconnected? If yes then you do have a mixture control issue and the > >>>> sensor > >>>> being disconnected is helping get past it. I would look for massive > >>>> vacuum > >>>> leaks and wiring issues. Except for the O2 sensor which is a > >>>> "consumable", > >>>> it is very rare for any of the other sensors to go bad. Again, the > >>>> connectors and wiring is more often the real problem. > >>>> > >>>> Dennis > >>>> > >>>> > >>>> -----Original Message----- > >>>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf > >>>> Of > >>>> Steven Shelton > >>>> Sent: Tuesday, February 25, 2014 2:12 PM > >>>> To: vanagon@GERRY.VANAGON.COM > >>>> Subject: Re: Engine Starting Problem > >>>> > >>>> I meant that the engine turns over and over but it will not start/run. I > >>>> checked the intake air sensor (Bentley 1999 edition pg 24.28): > >>>> > >>>> 2-3 556 > >>>> 6-9 557 > >>>> 6-22 2697@18 degrees C > >>>> 2-3 and 7-9: ohms change as I moved the sensor plate > >>>> > >>>> Is this a definitive test or could there still be something wrong with > >>>> intake air sensor? > >>>> > >>>> > >>>> On Tue, Feb 25, 2014 at 1:59 PM, Dennis Haynes > >>>> <d23haynes57@hotmail.com>wrote: > >>>> > >>>> Cranking and starting are two completely different issues. The starter > >>>>> will crank (turn)the engine over if you removed the complete fuel > >>>>> delivery system and put it out to the garbage. > >>>>> Check the wiring on the back of the starter. The solenoid trigger wire > >>>>> may be loose and you're working near there is making or breaking that > >>>>> connection. > >>>>> > >>>>> Dennis > >>>>> > >>>>> -----Original Message----- > >>>>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > >>>>> Behalf Of Steven Shelton > >>>>> Sent: Tuesday, February 25, 2014 1:18 PM > >>>>> To: vanagon@GERRY.VANAGON.COM > >>>>> Subject: Re: Engine Starting Problem > >>>>> > >>>>> OK, as I said above, the engine would not crank at all, even after > >>>>> returning to it using a charged battery the next day. As soon as i > >>>>> removed the AFM, even with the #1 spark plug removed, the engine > >>>>> cranked right up. > >>>>> I checked the ECU connector, with the following results: > >>>>> > >>>>> 2-7 3213 ohms@16 degrees C > >>>>> at this temperature the reading should be 3000 ohm to 3500 ohm. > >>>>> I also checked at the temp 2 sensor, it was 3178 ohm. > >>>>> > >>>>> Other readings were: > >>>>> 1-7 10.64 V > >>>>> 5-7 infinity > >>>>> 6-19 558 ohm > >>>>> 7-25 0 ohm > >>>>> 11-7 14.9 ohm > >>>>> 12-7 15.1 > >>>>> 14-6 3154 ohm > >>>>> 15-19 555 ohm at rest, it moved up when I moved the plate > >>>>> > >>>>> Does this mean conclusively that the temp 2 sensor is OK? Any > >>>>> suggestions on what to try next? > >>>>> > >>>>> > >>>>> > >>>> > >>>> > >>>

-- David McNeely


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