Date:         Mon, 28 Nov 2016 10:32:02 -0800
Reply-To:     Jeff Schwaia <vw.doka@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jeff Schwaia <vw.doka@GMAIL.COM>
Subject:      Re: No start hot
In-Reply-To:  <CAB2Rwfhd5+sZY9M6NkhSCK3AgBufHrS7W1XxRfKF5-eiaD-VuQ@mail.gmail.com>
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The most common hot start problem I've seen over the last 30 years is a bad air temp sensor in the AFM.  Unfortunately, the air temp sensor is not a serviceable part, and the rebuild quality of the AFMs on the market is very poor.  It is not unusual to go through 3 or 4 "rebuilt" AFMs to find a good one.

Cheers, 

Jeff


-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Neil N
Sent: Sunday, November 27, 2016 5:40 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: No start hot

> I wonder if NSH has more to do with "not enough air", less to do with 
> more than normal fuel?  Does the AFM manage air at start up?

My guess is that even if the AFM flap didn't get pulled open when cranking engine (it likely does though), the air bypass (CO adjuster
screw) would allow little air in. Details of the AFM being used as in input to ECU when starting engine, might be mentioned in the Digifant section of the Bentley? I know that section describes functions of various inputs like the coolant temp sensor.

Zoltan: what engine? Coolant temp sensor and wiring to/from ok?

My thought regarding the fuel pressure residual test was dripping injectors at shut off. Check the plugs once the hot start issue shows up? See if they're wet with fuel?



On 11/27/16, Skip Laubach <skiplaubach@gmail.com> wrote:

> I wonder if NSH has more to do with "not enough air", less to do with 
> more than normal fuel?  Does the AFM manage air at start up? I can't 
> remember what significantly corrected my NSH, but it may have happened 

> when I installed a new AFM.
> Skip
>
> Sent from my iPad
>
>> On Nov 27, 2016, at 1:56 PM, Neil N <musomuso@GMAIL.COM> wrote:
>>
>> residual fuel pressure test? See if fuel might be leaking out at 
>> injector?


--
Neil n

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