Help please

Taz Horton

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Going back to august in the heat l had a coil pack melt so purchased new one no joy , now I have six new ones the correct bremI part no as the original ones 6 new plugs ngk new air filter still running on 5 cylinders swapped them around still running on 5 cylinders swapped injectors around still running on 5 , it's cylinder 3 ..... does anyone have any ideas ??? Thanks
 

t-tony

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Did you do a compression check?

Tony.
 

Taz Horton

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No Tony I haven't I parked the car in the staff car park it was running perfectly came back to it later , this was the fist day of the heat wave started the car and it was missing so found the melted coil pack ??? Ime wondering if as the coil pack hadn't been sparking it might have built up some kind of heat or other issue someware else ,,, can't imagine it's mechanical as it was running fine when I arrived at work ? I wondered ecu ?
 

Taz Horton

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Also Tony I've just taken out the six new plugs 5 you can see have been firing no 3 still shiny and new
 

t-tony

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Can you try swapping a couple of injectors to see if the problem is fuel rather than spark related?
Have you read the codes? If so what did that tell you?

Tony.
 

Nodzed

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@t-tony
Tony didn't someone on here have this issue and found it was the wire running to the coil pack was the problem? or have I dreamt it?
 

Taz Horton

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Ive swapped the injectors still no joy haven't got a coad reader ime wondering weather to try another wiring loom ( plug lead so to speak )
 

Nodzed

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@Taz, daft question but have you checked that #3 plug has actually got a spark? Start with the easiest check first??
 
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t-tony

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@t-tony
Tony didn't someone on here have this issue and found it was the wire running to the coil pack was the problem? or have I dreamt it?
That does ring a bell Niall, but I can't think who it was mate.

Tony.
 

Nodzed

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@Taz Horton if you can definitely rule out the plug and the coil pack then I would give @mrscalex (Rob) a shout. He should be able to help :thumbsup:
 

mrscalex

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You might be thinking of the replacement engine I put in @Nodzed & @t-tony . It was fine when it left the donor car. In the receiving car it would only run on 5 cylinders.

It turned out to be the pin on the DME that controlled the firing signal of the cylinder. It was corroded. No firing signal reaching the coil pack.

Logic suggested that was the cause of the original engine blowing it's guts out of the sump. Fuel built up, no spark, compression raised and then boom. It was bought like that so I don't know the history first-hand.

It's well worth pulling the DME out and inspecting for damp ingress and pin corrosion. That's something everyone should do bearing in mind the possible consequences...

But as always, best to start with the error codes. Mine reported as a misfire on cylinder 4 and that was it.

If it's not that, happy to try and make further suggestions if we know the error code. But I'm no ignition/engine expert. Just ruthless at getting to the bottom of any problem so it doesn't beat me ;)
 

mrscalex

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Thinking about it you should work out what caused the melted coil pack as it could lead you to the fault. You should still check for errors but they will potentially tell you only the consequence on this occasion and not necessarily the root cause.

I don't think coil packs randomly melt. Was it tricked into continuously activating by some faulty wiring? If so you have the opposite problem to me. I had no signal. You might have had a continuous signal, melting the coil pack but providing no spark.

Have you traced the harness back to the DME to look for any pinches, exposure to exhaust manifold etc? A quick google suggests the coil is powered by completion of a ground circuit. So if something is chaffed and touching something connected to ground that could be the issue.

This thread sounds very similar to your position.

https://www.bimmerfest.com/forums/showthread.php?t=765923
 

Taz Horton

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Thanks very much for that it's definitely not plug , coil pack, or injectector . No signal getting to coil pack so now to look at what you have suggested thanks again
 

Taz Horton

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Well after all of your help , thanks again , I have it sorted .it was the ecu ???? changed that a couple of days ago and all is well , I don't no if it was the ecu that melted the coil pack or the coil pack that bu**ed the ecu anyhow found on ebay a chap that sent me a remapped ecu so no need for any other work to be done 154 quid less 50 quid for the old one so quite happy good service too arrived 2 days after ordering .... so now I can go join the traffic chaos in central cambridge again :cool:
 

t-tony

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Well after all of your help , thanks again , I have it sorted .it was the ecu ???? changed that a couple of days ago and all is well , I don't no if it was the ecu that melted the coil pack or the coil pack that bu**ed the ecu anyhow found on ebay a chap that sent me a remapped ecu so no need for any other work to be done 154 quid less 50 quid for the old one so quite happy good service too arrived 2 days after ordering .... so now I can go join the traffic chaos in central cambridge again :cool:
That's some good news Taz, maybe you could post a link to the seller?

Tony.
 

petecossie

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Its marvelous when you get a problem like this solved after all the head scratching, well done.
 
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