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Poor starting TR3a Discuss.

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#41 Peter Cobbold

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Posted 15 March 2016 - 01:47 PM


Just looked up the Denso Iridium spark plugs that I think will do a 4 cyl TR  -  Denso IWF20 - Just £8.00 a pop.  I am in the old world of spark plugs costing one to two pounds a set or each as it is today - Do you have road test experience of these items in a TR Peter?  Should we now be ditching our NGK BP6HS (TR2-4A) and NGK BP6ES (TR5-6 PI) ?





Peter W


No experience yet, they're sitting on the shelf. My aim is to run really lean at cruise and not to suffer weak sparks under boost: wire plugs should do both. I am always wary of sales blurb but wire plugs are based on sound data, in textbooks and publications. eg thsi on ignting lean mixtures:


So they should help starting. The carb may be richended but only a small fraction of petrol will vapourise in a cold engine, so the mixture at the plug will be lean.


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#42 roger murray-evans

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Posted 03 November 2017 - 03:21 PM

Had this exact problem on an old Vauxhall Velox very recently.

Battery was fine, took forever to churn and start then OK 'til

the next occasion when cold.Replaced all ignition components,

one at a time, regardless of how new they were.

Cap, leads coil condenser, rotor (I didn't bother with changing plugs.

The chance that all 6 were knackered seemed highly unlikely.

Just about to give up when I did get around to changng the perfectly good points.

Voila.Instant success and as a bonus, an irritating mid range, long term

'carburretor' stumble disappeared simultaneously!

Since then starting has been instant.Hot or cold.

And the bonus is, all those ignition parts you tried and didn't help can

now be kept handy for the next occasion.


Roger M-E

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#43 Ian Vincent

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Posted 09 November 2017 - 12:00 PM

FWIW,  I solved my problem (see post somewhere above) during the summer by fitting a Pertronix kit.  Car starts instantly and even runs more smoothly


Rgds Ian

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#44 RogerH

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Posted 09 November 2017 - 12:11 PM

Over the last 3 months or so the 4A has been iffy to start. It always does but after a fair bit of cranking.

Last week I was plagued with a spasmodic cough.


After some meddling I replaced the spark plugs and lo and behold the coughing has stopped and the poor starting has improved dramatically.


Start with the easy items first.



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