Date: Wed, 13 Apr 2011 18:50:26 -0400
Reply-To: Jonathan Poole <jfpoolio@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jonathan Poole <jfpoolio@GMAIL.COM>
Subject: Re: Consistent cutout at 3k rpm
In-Reply-To: <062501cbfa1c$5a713cf0$6401a8c0@PROSPERITY>
Content-Type: text/plain; charset=ISO-8859-1
Hey Scott,
It's also pretty common for folks to not read what is written,, check again
and you'll see that my first sentence provides year and engine information
;)
Thanks for your suggestion and I agree that it could be the afm. I did pop
the cover off, lightly clean and even adjust the slider to see if it was
related to this issue. I have a real-time air fuel ratio guage so can make
adjustments like this and get the ratio dialed back in although I'm waiting
for a replacement part on it currently so am set by ear/temp until it comes
back in. In any case it doesn't appear to be slider wear in the afm. I've
been wondering if it is the signal coming from the pertonix that is not up
to keeping the injectors firing at higher rpm. It's like there is still a
signal at the dizzy but maybe the computer loses it?
Jonathan
On Wed, Apr 13, 2011 at 4:49 PM, Scott Daniel - Turbovans <
scottdaniel@turbovans.com> wrote:
> lol..
> half the time people don't say what kind of engine they are talking about.
>
> since all waterboxers have electronic ignition ( waterboxer starts in 1983
> ) and 83 diesels don't have points , you must be talking about an air-cooled
> vanagon.
>
> it's really nice to have two distributors ..
> one to modify, one stock with points as a back up.
> I think I would look for another good used distributor just to have one
> anyway.
>
> Air flow meter pops into my mind.
> I have seen them get worn in one spot ..
> the spot that corresponds to around 3,000 rpm .
>
> just a thought of something else to consider..
> not a real diagnosis.
>
> what happens if you just advance the timing more ?
> just as a test.
>
> ----- Original Message ----- From: "Jonathan Poole" <jfpoolio@GMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Tuesday, April 12, 2011 9:33 PM
> Subject: Consistent cutout at 3k rpm
>
>
>
> Howdy Vanagon List,
>>
>> My '83 Air-Cooled Vanagon is consistently cutting out at 3 thousand rpm.
>> This behavior started recently after I made some changes to the ignition
>> system. I believe that the problem is related to my changing out the
>> breaker points for a pertronix electronic ignition module but it may also
>> be
>> related to the new plug wires, distributor cap, rotor, coil, plugs or the
>> thorough cleaning of all accessible electrical connections in the engine
>> compartment or the adjusted timing.
>>
>> A few items of note:
>> -the timing at idle and high-rpm is good (7.5 deg to 31 deg) so it doesn't
>> appear to be an advance issue
>> -the engine runs great all the way up to 3k rpm with better power/feel
>> than
>> before these changes
>> -fuel pressure was stable when tested it while making these changes.
>> -engine temps are good (350 cht, < 220 oil) when cruising at 2900 rpm
>> -I have tried different gaps between the pertonix unit and the magnetic
>> ring
>> with little/no change in cutout/performance.
>> -the tach doesn't drop or jump erratically when the engine cuts out which
>> may contradict my suspicion of the pertronix unit? The tach is out of a
>> '91
>> Vanagon and wired up in typical fashion off of the coil.
>>
>> My next tests will be to re-check voltage at the coil at high-rpm and then
>> to put the points back in but I wanted to inquire here before the
>> switch-out
>> in case there is something easy that I have overlooked that I can test
>> before pulling the pertronix out.
>>
>> Any suggestions, especially of easy tests, are appreciated.
>>
>> Thanks,
>>
>> Jonathan
>>
>
>
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