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5L Misfire Part 2

FrangaVP

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I have had a misfire on my VP 5L a while ago and I let it sit for a while.

The misfire is now no longer intermittent and is pretty much constant.

I've replaced the rotor, distributor cap, plugs. I have also checked the charge coming off the alternator and its normal. The leads and coil have both been replaced in the last 18 months. Also there are no fault codes.

If anyone has any insight into what it might be it would be appreciated. Thanks
 

FrangaVP

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Its one of the next things on my list, as soon as I can get a hold of one.
 

wraith

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Get one of these mate. You won't be disappointed. Far superior design to the factory item. I got the next level above this one though. I was a bit hesitant at first but the module is awesome and the seller really great to talk to. Tell him Andrew with the clubby recommended him and I'm sure he will look after you.

Holden Commodore Ignition Module V8 5 0 Racing Exchange 3yr Warranty | eBay
 

MikeC

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I've had one of these Racing modules in my 5 L VQ Stato for the past 2-3 years and I can highly recommend it. Car seems to have more power than with the GMH original and the car seems a lot easier to start. But maybe I've forgotten how good the original performance was when I bought the car 20 odd years ago.
 

FrangaVP

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Okay time for an update.
I tested the ignition coil with a multimeter and the primary (between the positive and the negative was up to spec). However the secondary which sends the spark from the coil to the distributor registered 15.5k ohms when according to this thread the range should be between 5.9k to 7.3k ohms.

I'm not even sure if this is the right coil for the car it was just thrown in at a Holden mechanic out in the bush when the oil coil packed up in the middle of nowhere.

I don't much about auto electrics but being twice the accepted range seems like somethings wrong to me.

Any thoughts or help would be appreciated.
 

dans_vz

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Get one of these mate. You won't be disappointed. Far superior design to the factory item. I got the next level above this one though. I was a bit hesitant at first but the module is awesome and the seller really great to talk to. Tell him Andrew with the clubby recommended him and I'm sure he will look after you.

Holden Commodore Ignition Module V8 5 0 Racing Exchange 3yr Warranty | eBay
+1 I got one of these too, the seller couldnt be more helpful, he knows his stuff...
 

Circlotron

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However the secondary which sends the spark from the coil to the distributor registered 15.5k ohms when according to this thread the range should be between 5.9k to 7.3k ohms.
Sounds like it might even be an old points type coil.
Not sure what sort of coil is used ex factory but chuck your dud one away and get one from a blue motor. IMHO they are slightly better than the stock plastic transformer style coils despite looking old fashioned and daggy.
 

drewVHSS

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ummm no....
wrong advise above....
Injected 5.0L uses a MEC716 coil to replace the oil filled type. not a HEI718 coil that blue motors use.
 

hi_ryder

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wraith

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I think that's just him in general. He's very talkative. I was hesitant because of the whole racing, burnout thing but it's just easy marketing really.
 

delcowizzid

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mec and hec coils are fine stands for medium and high energycoil
 

Circlotron

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ummm no....
wrong advise above....
Injected 5.0L uses a MEC716 coil to replace the oil filled type. not a HEI718 coil that blue motors use.
What I was saying was the oil-filled metal can blue motor coil (6 or V8) is a good replacement for the original 304 EFI coil, not that they are the same coil. They are way more common too, so should be a lot less expensive. With the typical 7 amps primary current of a 304 ignition module, a blue motor coil will put out 90 milliJoules. That's almost 3 times what an MSD6 puts out of a coil. They are a good setup.
 
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NoZferatu

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have u cleaned the spark plugs?
 

bigstu

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Make sure the module is earthed properly ....I had a misfire with my 5 litre and we couldn't find it and it kept cooking the module and we replaced everything and it only stopped once we earthed the module properly...... we ran an earth wire from the module to the alternator bracket
 

VP-EXCHASER

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Could be an injector. Make sure all have a good connection, no pins half pushed out ect.
 

FrangaVP

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have u cleaned the spark plugs?
Yeah, I changed them for new ones.

I got a new Bosch coil (the recommended one), I'll let you all know how it went when I work on it next.
 

FrangaVP

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I changed the coil and the coil to distributor lead. Miraculously this fixed the problem completely.

So after all it turned out to be a coil that wasn't right for the car the first place.
 
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