[DeTomaso] Sparkplugs

michael@michaelshortt.com michaelsavga at gmail.com
Mon Jul 5 12:07:14 EDT 2010


Has it run before in this set up?

Sounds like it is burning rich, when it does run, doyou smell gas
really strongly in the exhaust?

Have you changed the carb jets to a smaller size?

Just ideas.

Michael Shortt

On Mon, Jul 5, 2010 at 11:48 AM, Henrik Svensson <hsv at traen.se> wrote:
> Hi Dan
>
> Thanks for all the input.
>
> I have an old MDS box that came with the car. Ford Motorsport "Extra Performance Ignition" M-12199-C301. I don't know much about it. I did the same misstake as Mike last year. It didn't pass by unoticed. It run very bad!
>
> I have not verified strength or a-f ratio. Iäll guess I'll have to go to a garage to check the ratio to start with.
>
> Thanks!
>
> /Henrik
>
> ________________________________
>
> Från: detomaso-bounces at realbig.com genom Daniel C Jones
> Skickat: må 2010-07-05 16:50
> Till: detomaso mailing
> Ämne: Re: [DeTomaso] Sparkplugs
>
>
>
>> The plugs does look ok to me when removing them, just a very little
>> sooty but not as much that is should give me problem when firing the
>> engine?!?
>
> With unleaded fuels and additives like MBTE or alcohol, it can be hard
> to read plugs.  When in doubt, I sometimes pull a plug from my daily
> driver for a comparison.
>
> http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp
>
>> Any recommendations regarding Heat Range or electrode gap?
>
> What I have in the database for AFD heads is
>
>  Spark Plugs: 3/4" reach, 5/8 hex, washer seat (e.g. NGK BCP6ES)
>
> which appear to be the plugs you are using.  Have you verified the strength
> of the spark and the air-fuel ratio?  I like to use a wide band oxygen sensor
> and an ignition tester (one with an adjustable gap that looks like a spark
> plug with a grounding clamp).  You mention the MSD ignition.  Is that just
> the distributor or also the multi-strike capacitive discharge box (e.g.
> MSD 6AL).  What are the gaps currently set at?  Also, retarded timing can
> foul plugs.
>
> A properly functioning MSD-6AL should be able to keep plugs firing even
> when the mixture is rich.  Mike Drew had the choke wire come loose and
> we ran for 140 miles with the primaries choked closed.  If the spark
> strength is good, the timing and air-fuel mixture correct and the choke
> functioning try the next step hotter plug.  In your case, that would be a
> BCP5ES.
>
> Dan Jones
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-- 







Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390


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