[Rovernet] P5 running problem.

Ben Saunders bsaunders at firstva.com
Sun May 17 08:18:36 EDT 2015


Hi Peter,
Not too sure if this will be of any help but some years back I had a 
similar problem that BP had been using 40% ethanol in our area.

On 05/16/2015 09:32 PM, peter king via Rovernet wrote:
> Update on the P5:  I ran it until it began to falter today, and checked the coil temp. Hot, but not excessively.  I checked the resistance across the coil and it was normal for the coil (3.3), checked secondary resistance, also normal. Checked voltage to coil with key on and with engine running at 2500 rpm, both ok.  I removed the sediment bowl to clean the screen and found it missing—probably dropped out when I removed the dome one night after stalling out on the road.  I removed the carburetor and cleaned it again, and will probably install an inline fuel filter to eliminate that as the culprit. But when I dismantled the carburetor, I noticed a lot of carbon on the inside. I also had backfiring at one point from the carburetor when I pushed the throttle quickly.  I’m going to check timing next, but any other thoughts on next steps?
>
> thanks for your collective wisdom.
>
> Peter
>
>
>
>
>   
>> On May 12, 2015, at 7:01 PM, peter king via Rovernet <rovernet at rovernet.org> wrote:
>>
>> Thanks Steven et al,
>>
>> I’ll be checking this and all other suggestions this weekend, will let you know what I discover.
>>
>> Peter
>>
>>
>>> On May 11, 2015, at 5:57 PM, Steven Dibdin via Rovernet <rovernet at rovernet.org> wrote:
>>>
>>> Hey Peter,
>>>
>>> I have to second what others have said. This sounds like a classic case of an overheating coil. Try touching the coil when the engine starts running rough, is it hot to the touch? Do you have a ballast resistor on your system? Sometimes when they go bad they can let the full 12v get to the coil under normal running and overheat it. As with all things auto based, start with the easy to test and eliminate stuff first and work from there.
>>>
>>> Best of luck,
>>>
>>> Steven
>>>
>>> Sent from a small screen, please excuse any typing errors.
>>>
>>>> On May 11, 2015, at 17:37, Michael Connor via Rovernet <rovernet at rovernet.org> wrote:
>>>>
>>>> PeterTry swapping the coil for a known good one. I have had more coil issues in recent years than ever before.This sounds like symptoms I had on my P4 except I could drive longer than 10 min. On my Morgan that stopped on a trip back from Houston one rainy evening and changed the coil along side the interstate.The coil worked fine and I got home with no other issues. A week or so later put the old coil back on and ran fine. It turned out there was a break in the wire from coil to distributor. Sometime it would make and sometime it would break.   This would be worth a check . Good LuckMike Connor
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>>
>>
>> Peter King + Company
>> 21 Drydock Avenue
>> Floor 7
>> Boston, MA 02210
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>> www.king-co.com <http://www.king-co.com/>
>> www.facebook.com/pkingco <http://www.facebook.com/pkingco>
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> Peter King
> Peter King + Company
> 21 Drydock Avenue
> Floor 7
> Boston, MA 02210
> 617-292-7877
> www.king-co.com
>
>
>
>
> _______________________________________________
> Rovernet mailing list
> Rovernet at rovernet.org
> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org





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