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Date:         Tue, 29 Aug 2017 18:37:40 -0400
Reply-To:     Dennis Jowell <dennisjowell@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Jowell <dennisjowell@GMAIL.COM>
Subject:      Re: 2.2 engine hiccups at 3300 rpm
Comments: To: Dennis Haynes <d23haynes57@hotmail.com>
In-Reply-To:  <CY4PR20MB1303A5BD90922298CB4AD7A1A09F0@CY4PR20MB1303.namprd20.prod.outlook.com>
Content-Type: text/plain; charset=utf-8

Plugs running lean, I mean the electrodes are light tan in color which in my racing motorcycles was heading towards a lean fuel mixture. Sorry for any confusion. Swapped AFM with a good one- no change, swapped distributor cap and rotor with and older one- no change. Fixed the leaking Temp 2 sensor. I will do electrical test on the O2 and other wiring. Ordered a new Temp2 sensor for a spare from Ken Miss fires at high rpms only(3200-3800) tomorrow I'll start again.

Dennis J

Dennis Jowell Scotch Hollow Farm Newbury, Vermont

> On Aug 29, 2017, at 5:54 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote: > > Not sure what you mean by them running lean. They should be clean and deposit free. Bad temps 2 sensors or the connections to them usually show up as starting and warm up issues. The actual accuracy of the temp 2 sensor is not critical on a hot engine. Basically it sets the fuel mixture and idle speed for start up and then at around 120F or so the ECU puts the engine into closed loop operation, O2 sensor feedback in control. There is some adjustment for ignition timing based on temperature but that is very limited. > > Besides the spark plugs bad ignition wires, the resisters on the wire ends, and cap-rotor can cause ignition miss. An unbalanced injector can also cause a cylinder miss fire. Usually this shows up more at idle-low speeds. > > Dennis > > Sent from Mail for Windows 10 > > From: Dennis Jowell > Sent: Tuesday, August 29, 2017 6:22 AM > To: Dennis Haynes > Cc: vanagon@GERRY.VANAGON.COM > Subject: Re: 2.2 engine hiccups at 3300 rpm > > Dennis, > Cleaned and adjusted spark plugs. They are apparently running on the lean side. Also found the Temp 2 sensor leaking drops of coolant. It was replaced in the fall last year. I'll check out the O2 sensor then will test drive. ( could the temp 2 sensor cause the problem? ) > > Dennis Jowell > Scotch Hollow Farm > Newbury, Vermont > > > On Aug 28, 2017, at 10:32 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote: > > There are a lot of things that can cause the hiccups or engine miss even at a given speed range. It is extremely unlikely that it is the air flow meter. I recently had a van with hiccups with changing engine load. Turned out to be the wire connection at the alternator that feeds the fuel injection. That one kicked my but for at least a week. > > Point is you need to do some real trouble shooting and just changing parts is not the way to go. Changing parts can often mask bad wiring or connectors where just moving things made a change but the fix does not last so next time a symptom appears one just moves on to the next part. > > For these hiccups I would begin by suspecting the O2 sensor circuit. The fast easy test for this would be to cycle the ignition off and back on while still moving. If the hiccups disappear for a short while than most likely the sensor is weak or the system has an electrical problem causing the ECU to make the mixture too rich. At this point changing throttle-speed may get the engine above or below that critical choking point. > > For all the vans I have worked on I have only actually fixed three with an air flow meter. And those three had the meters opened up and tampered with They really don’t go bad and you can’t reliably test them with an ohmmeter. I have also found that the fuel injection often gets blamed for running issues and that it is not the problem. The ignition system can also cause all sorts of grief even from something as minor as a crack (carbon trace) in the distributor cap or rotor. > > Dennis > > > > Sent from Mail for Windows 10 > > From: Dennis Jowell > Sent: Sunday, August 27, 2017 6:16 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: 2.2 engine hiccups at 3300 rpm > > Thanks Dan I have a replacement AFM I will try tomorrow > > Dennis Jowell > Scotch Hollow Farm > Newbury, Vermont > > > > On Aug 27, 2017, at 4:40 PM, Dan N <dn92610@gmail.com> wrote: > > > > so it's not altitude related... > > > > besides what I suggested to do/check ... I'd think that the carbon tracks on the AFM were worn at the 3K/3.5K rpm spot (that's where the contact sits most of the time) ... if it's the case then you will need and a rebuilt AFM or have yours rebuilt... unless you want to do it yourself... > >


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