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2004 Fiesta 1.4 Petrol

Posted By Iver Thursday, September 05, 2019 6:14:16 PM
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Iver
 Posted Thursday, September 05, 2019 6:14:16 PM
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Very strange one this, to me anyway.


This job was for a Mobile Mechanic.

The info I got was that a new fuel pump (in tank) has been fitted because no fuel was coming up to the rail. With the new pump he still no fuel being pumped up.

Furthermore he said the Ignition Coil had a crack in it hence no spark.



I asked him to get the coil (guess where he got it from) and fit it. While he did that I got to work behind the Glovebox confirming Fuse, Relay, Fuel Cut Off.

The fuse was blown. We now have fuel delivery at the rail. Coil Fitted and the car started.



2 minutes lather the coil started smoking, cracked in the same way as the old one and it cut out.



I have never ever seen that before. It is a 3 wire affair, Live and 2 signal wires from PCM. My conclusion is it grabs an earth from its mounting bolt.

My question here is: What would cause that ??

I couldn't do any testing as it does not run. Clutching at straws my guesses are:

1. The alternator is pushing out a very high voltage, something tells me that scenario would wipe out a lot of other stuff before the coil - don,t know !

2. Cheap ECP Coil - but for the fact both failing and cracking in the exact same way.



Reluctant to put a dealer supplied or Known Genuine Delphi / Bosch on to see it explode again.

thanks
denbo
 Posted Friday, September 06, 2019 12:52:36 AM
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Genuine ford coils only for me. Seen these cheap aftermarket coils have chunks missing. Why not try a used one from local scrapers just for test purposes.
K And R
 Posted Friday, September 06, 2019 2:42:24 AM
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Iver

" Cheap ECP Coil "


So ECP are OK as a sponsor of top tech, but supply crap parts !! double standards ?


Kev.

"If you dont KNOW how it works, don,t try to test or fix it"
McTech
 Posted Friday, September 06, 2019 6:03:41 AM
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K And R (9/6/2019)
Iver

" Cheap ECP Coil "


So ECP are OK as a sponsor of top tech, but supply crap parts !! double standards ?


Kev.


guilt money - pay off...

I O, I O, its off to work I go!
Iver
 Posted Friday, September 06, 2019 8:48:33 AM
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So ECP are OK as a sponsor of top tech, but supply crap parts !! double standards ?



I couldn't careless who sponsors it. Funny how the coil from ECP was £35 and from Allparts its near a £100.




Any ideas on why it bang ?
Thema
 Posted Friday, September 06, 2019 1:00:33 PM
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Probably too late now but it would have been interesting to put an ohm meter between pins, HT outputs and the hold down bolt.
I can't see it being anywhere in the ECU because if it smoked the coil it would have smoked the ECU as well.Maybe a wiring fault on the wiring back to the ECU? But when you say the alternator is putting out a high voltage what sort of figure are you talking, and how many amps?

Peter
denbo
 Posted Friday, September 06, 2019 2:05:46 PM
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It may well have taken the ecu with it. It usually takes the coil driver out.
Iver
 Posted Friday, September 06, 2019 2:30:29 PM
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Peter

But when you say the alternator is putting out a high voltage what sort of figure are you talking, and how many amps?



That was just my thoughts after the coil popped.


Just got a phone call to say he got another from ECP and that has gone the same way.
Robski
 Posted Friday, September 06, 2019 3:08:39 PM
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last I knew of a coil pack 'blowing up' it was working too hard ie high KV from a very large gap !

no P0351/2 ?


Rob.
Iver
 Posted Friday, September 06, 2019 3:25:55 PM
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Rob

Yes Indeed but today he did replace the leads and plugs on my suggestion. Before he put the coil on.. He did say on side of the Coil is Hot whereas the other is not.

Also he took the Alternator "Big" wire off before starting it.

I'm thinking Coil and Bad Batch.

The Primary side is unlikely to be doing this or the PCM would pop, this surely has to be Secondary Insulation or Near Dead Short.


I had a E39 M5 a while a go where one coil popped, I'm guessing secondary voltage went up the Signal wire. The IGBT (driver) was mutilated and detached from the PCB but it did act as a fuse so a new IGBT Fixed it.

Sorry Rob. Did not get as far as Scanning it for codes or data. My remit was to get the fuel pump running which I did by replacing the blown fuse.
Friday, September 06, 2019 3:37:39 PM by Iver

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