Date: Sun, 15 Jul 2018 20:47:37 -0700
Reply-To: SC Strawn <scstrawn@VERIZON.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: SC Strawn <scstrawn@VERIZON.NET>
Subject: Re: new coil secondary resistance tests out of spec
In-Reply-To: <MWHPR20MB1551826CCDB4012F0FBCC21BA05D0@MWHPR20MB1551.namprd20.prod.outlook.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Good information here, Dennis.
Thank you!
Sally
On 07/15/2018 07:42 PM, Dennis Haynes wrote:
> Testing coils by resistance is not a good test. What you really need a hi voltage potential tester to look for shorts to the case or failed insulation. Rarely will these coils fail open. Depending on how the fail there is the potential to take an ECU or the earlier coil module with it. If we can blame anything beyond luck on why they fail, anything that increases the spark voltage can add to the deterioration of the winding insulation. Excessive spark gaps, rotor and distributor tips, open wires or the wire resistor ends.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of SC Strawn
> Sent: Sunday, July 15, 2018 1:41 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: new coil secondary resistance tests out of spec
>
> Thanks so much for the quick reply, Ken, exactly what I needed to know!
>
> The Hall sender tested good, and I was pretty much down to ECU. Cleaned up a bunch of connectors including the ECU connector (had it open to do the connector wiring tests per Bentley and to check solders), buttoned her up, and she started and ran, but I know that may not last.
>
> This is a good time to thank you for all your great videos, and the information you provide to the list. Great stuff!
> Thanks again,
> Sally
>
>
> On 07/15/2018 10:26 AM, kenneth wilford wrote:
>> Yes, either the Bentley spec is wrong or all new coils are out of spec
>> but still work fine. No coils I have ever tested have been within
>> what Bentley specifies as good. I keep a good, tested, used one
>> around to swap in for testing purposes. It doesn't have the proper
>> resistance reading according to the Bentley manual though.
>>
>> Coils usually fail after they have started to leak the tar that is
>> inside them, out. That has been my experience. Most of the time a
>> no spark condition on a Digifant Vanagon is the result of a failing
>> ECU or failing Hall Sender in distributor. We have rebuilt ECUs and
>> new distributors in stock if you need them. Also we help people
>> trouble shooting their vans via email or phone every day of the work
>> week. Please call on us if you are in need.
>>
>> Ken Wilford at vanagain.com
>> <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fvana
>> gain.com&data=02%7C01%7C%7Caaa2d981bdc14b218bae08d5ea7a1e3d%7C84df9e7f
>> e9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636672732563518759&sdata=%2BnwEfEZY
>> 6VvifunBhLwsOekqoa7om6ZlVMbKYWze4c8%3D&reserved=0>
>>
>> On Sun, Jul 15, 2018, 12:59 PM SC Strawn <scstrawn@verizon.net
>> <mailto:scstrawn@verizon.net>> wrote:
>>
>> 17+ year lurker via the archives, haven't needed to post since my
>> "Dealer Disaster" thread 15 years ago.
>> 1989 Westy "Vanna White", I'm the original owner.
>>
>> Had a sudden onset cranks/no start/no spark situation a couple of
>> weeks
>> ago which the very generous David Beierl helped me work through as
>> I was
>> waiting for approval to rejoin the list. During that process I
>> ordered a
>> Bosch coil 00061, Bosch part # 0 221 122 349 (the green label one)
>> from
>> Autozone. First one did not work (but that may have been due to other
>> factors), and tested Primary resistance 0.7 ohms (Bentley says
>> 0.5-0.8),
>> Secondary 4.16k ohms (Bentley says 2.4-3.5k). Because it didn't
>> work and
>> because the secondary resistance was out of spec, I returned it and
>> ordered another, which I have just received. Vanna White is
>> running now
>> with the old coil in place, and I am deciding whether to keep the new
>> coil for what Stan Wilder used to call the Paranoid Parts
>> Department, or
>> to return it. This newest one tests Primary resistance 0.8 ohms,
>> secondary 4.22k, so secondary is still out of spec.
>>
>> So my questions are:
>> - is 4.22k is too far out of spec to work - either to have kept
>> her from
>> starting during my diagnostic process earlier, or in the long run to
>> keep her running well?
>> - for those of you buying/stocking coils, is it common to get
>> secondary
>> resistance out of spec on new coils these days, making it necessary to
>> try numerous times before getting a good new part? I have a 280Z that
>> took me 3 tries to get a working alternator, so I know that
>> happens too
>> often now, but didn't know about coils?
>> The spade connectors on these new coils are much thinner than the
>> original, so some tweaking of the female ends was required to get
>> a good
>> connection with the double connector for Terminal 1. Frustrating.
>>
>> The original problem at this point seems to have been cleared up by
>> cleaning up connections, all original parts still in place, though
>> time
>> will tell.
>>
>> Thanks very much,
>> Sally Strawn
>> and Vanna White
>>
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