Ignition coil

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mikeyb1
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Ignition coil

Post by mikeyb1 » Mon Aug 19, 2019 12:12 pm

Hello folks, Iv'e now had my Coupe for a couple of days and have already compiled a long list of jobs I want to do to improve/make it more enjoyable to drive. However, one thing really puzzles me, and that's the HT coil. When I first viewd the car, we went for a drive of a few miles and all was fine until it started to misfire badly. My friend who accompanied me suspected the coil, as he had experienced the same problem on his S6 Coupe. Sure enough the coil was almost too hot to touch. The seller stated that his garage had fitted a new one only a few days previously, but he promised to get it fixed before we went any further with the deal. This was done, and the new coil was also re-positioned so that it no longer got hot simply by being bolted to the engine block. The car ran fine, I bought the car, and drove home with no issues. My question is, what sort of coil had this garage fitted? They assured the PO that it was the correct coil, but I'm not convinced. Today it took an age to start, and only did so with the help of some Damp Start, the motor churning away with no sign of it firing. Could have been a coincidence, as it had sat outside during a couple of down pours, but it does seem strange. Car has electronic ignition (Accuspark I think, which I have had in several cars without problems) but can anyone identify that coil? I've never seen one like that in over 50 yrs of tinkering with cars.
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philhoward
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Ignition coil

Post by philhoward » Mon Aug 19, 2019 12:28 pm

It looks a bit like this one: which makes me think its a US upgrade - maybe for an American Ford?


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Post by Old and Slow » Mon Aug 19, 2019 4:36 pm

If you have trouble starting next time, I'd suggest temporarily closing all the plug gaps down to about ten thou and see if it gets any better. I'm thinking you might have a "weak" spark from the coil.
Of course this might not make any difference to starting, in which case...


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mikeyb1
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Ignition coil

Post by mikeyb1 » Mon Nov 11, 2019 8:56 pm

Evening all, still puzzled about this coil.See my original post and pic. Closer inspection shows markings of 12V PBT-GF30 Made in Italy. Anyway, whatever it is I'm now wondering if the original fault that prompted it's fitment is returning. ie bad misfire. A couple of days ago, I suffered a couple of misfires and backfires through the exhaust. Distributor has an internal electonic unit, so timing should be OK. What coils do members use (Coupe V6) and recommend? Also does the car use conventional ignition or would it have a ballasted system. How can I check, because my car has obviously had lots of mods to the wiring in the past.



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David Tew
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Post by David Tew » Mon Nov 11, 2019 9:15 pm

Have you checked the primary resistance of the coil? Electronic distributor modules normally require it to be greater than 1.5 ohms yet the Mallory-style coil you have is usually about 0.5 ohm so you could be frying the module.

The original Coupe system is non-ballast but it could have been modified, of course. You can check by measuring the voltage at the coil. It should be about 12v, if it's 9v then you have a ballast somewhere.

The best coil to use is a Lucas DLB105 or similar.


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Post by willholderogri » Tue Nov 12, 2019 6:46 am

Acuspark is designed for conventional coils as David said .the coil you have there is s modern version for cars with ECU ignition .try an older style coil as David advises and all should be well .the old ones are oil filled whereas the one you have is not


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Post by tony1966 » Tue Nov 12, 2019 6:40 pm

that coil is in pic same as used to upgrade cossies etc-grp a /4 style coil ...as advice above-its probs weber marreli or similar



mikeyb1
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Ignition coil

Post by mikeyb1 » Tue Nov 12, 2019 7:52 pm

Thank you chaps. Been busy refitting the LH exhaust today after I discovered a couple of leaks. Did check the coil as per Davids info but multmeter playing up so need to get another tomorrow. Opinion seems to be overwhelmingly against the coil currently fitted, and as I have a spare conventional type, I'll try that. Provided of course that testing supply voltage doesn't show the existence of a ballast resistor. If that's the case I'll rewire the supply to the coil.....am I correct in thinking that this comes from the tacho? Thanks again.



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peter freeman
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Post by peter freeman » Tue Nov 12, 2019 8:10 pm

Yes supplied via the tacho



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Post by Terry Rickard » Tue Nov 12, 2019 8:49 pm

I have an Accuspark electronic ignition unit fitted in the distributor in my SE6a and I also bought a matching Accuspark coil to go with it.
I have a blue Accuspark coil for a ballasted system.
I believe the red Accuspark coil is for a non-ballasted system.
Voltage at coil for a non-ballasted system will be a nominal 12 volts, but higher if engine running and lower if not (dependant on state of charge of battery).
Voltage at coil for a ballasted system will be 9 volts or lower and could be as low as 7 volts.
See: http://www.accuspark.co.uk/index.html



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Post by willholderogri » Wed Nov 13, 2019 7:54 am

I am using blue accuspark same as terry .So far no issues and I have contact breakers at the moment .


1962 mini, bedford CA , KR200. morris 1000, mini pickup.several escorts,ford grandad.ford cortina X2 ,astra, SE5A x 2 ,ford focus.

mikeyb1
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Ignition coil

Post by mikeyb1 » Wed Nov 13, 2019 1:42 pm

Thanks again folks for all the advice and info. I've checked the system according to David's instructions, and also those on the Accuspark website (thanks Terry, why didn't I think of that?) If my findings are correct, then I have a ballast type coil on a non-ballast system. I have e-mailed Accuspark with my readings and asked them for their comments etc. Looks like I shall be buying a red coil, and I'll probably replace the distributor module just in case it's suffered some damage already. I'll keep everyone posted once it's (hopefully) sorted. TTFN, Mike.



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David Tew
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Post by David Tew » Wed Nov 13, 2019 3:06 pm

I'm glad you've narrowed the problem down.
Good idea to replace the Accuspark module just in case it's intermittent, they're cheap enough. In fact they have a deal on eBay at present for a module, red coil and uprated rotor arm for £51.95. 😉


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mikeyb1
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Ignition coil

Post by mikeyb1 » Wed Nov 13, 2019 5:45 pm

Thank you David, you're certainly on the ball. If I bought the same items from Accusparks website they would cost almost £60.I've put their eBay offer in my Watch list. I'm just waiting for a reply from them hopefully confirming my diagnosis. Cheers for now, Mike.



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