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Old 27-07-2006   #1
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power loss!

been having problems today, engine management light came on this morning but thought nothing of it as been having problems recently!

last friday the light came on for no apparent reason, was the day after i had the cambelt changed so took it in to get it read just incase and it was 27 counts of faults on coil pack 1. the guy said it possibly could be the pack on the way out or most probably the spark plugs so changed them and its been fine!

today the light came on again for no apparent reason but later in the day the reason came aparent! i keep having a sudden juddering and loss of power, both when accelerating and sat at lights idling. it feels like one of the cylinders isnt firing but dropping the clutch and a tap of the gas sorts it!

so im a bit puzzled! we had this a few months back and some redex in the tank seemed to sort it. im thinking along the lines of the coil pack going and keeps stopping firing? or could it be something less expensive!
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Old 28-07-2006   #2
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Re: power loss!

27 counts of coil 1 faults? what do you mean

Dont you mean the error counter was at 27(it counts down the way)?
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Last edited by T14086; 28-07-2006 at 00:04.
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Old 28-07-2006   #3
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Re: power loss!

the guy said the coil pack had sent a fault 27 times!
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Old 28-07-2006   #4
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Re: power loss!

If you have a multimeter you can check them yourself. Check them when they are cold and then again when the engine is hot (ignition switched off of course or you will get a perm checking the HT side ) they should give more or less the same reading from each one.

TBO check it sooner rather than later it has been known for failing coil packs to fry the ECU
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Old 28-07-2006   #5
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Re: power loss!

wont the coil packs fry a multimeter? or you do them a special way?
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Old 28-07-2006   #6
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Re: power loss!

With the engine off there is no power supplied to the coils

You need to check the resistance accross the LT side first. Unplug the small single plug on each coil and touch both pins with the multimeter the reading should be between 0.5 and 0.6 ohms (when cold)

Then unplug the two HT leads and do the same this should be 6.6 to 8.1 ohms (when cold) if you get higher of lower readings then the coil pack is NFG

if you check them with the engine hot the readings should be about the same on the two coil packs.
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Old 28-07-2006   #7
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Re: power loss!

cheers allan! dont suppose you know which is numbered one and two? the error was for coil pack one but dont know if thats the front of the back pack
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Old 28-07-2006   #8
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Re: power loss!

Not 100% sure but I think it is the back one the one that feeds the spark plugs for cylinders 1 and 4
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Old 28-07-2006   #9
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Re: power loss!

Quote Quote:
Then unplug the two HT leads and do the same this should be 6.6 to 8.1 ohms (when cold) if you get higher of lower readings then the coil pack is NFG
you mean connect the multimeter between the 2 connections?
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Old 28-07-2006   #10
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Re: power loss!

yep
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Old 28-07-2006   #11
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Re: power loss!

You do not check a coil with resistance,the 'consumer' (in this case the coil must be 'working' at the time of test or you will get false readings.Coils tend to break down under load so resistance tests are useless.

p.s.coils do not send faults to ecu,how can it(they)?
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Old 28-07-2006   #12
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Re: power loss!

Sorry mate but

a pro may do it that way if he has the equipment but if I rember my degree level physics and 5 years working with industrial transformers I can tell you if you have been given an indication that there is a problem by a "Pro" then you can veryfiy this yourself if the problem is as bad as indicated

Resitance does very under load but static resistance especially on the primary side of a simple dc step up transformer (a coil) has a huge effect on the output voltage frequency, increased resitance of the LT side will reduce output voltage.. Fact

Now if you want to talk about AC transformers that are finding there way on to more sofisticated cars then that is a different matter

You are right there is no feedback to the ECU it is my understanding that the ECU logs the fact that there is high resistance.
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Last edited by allanhelen; 28-07-2006 at 19:23.
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Old 28-07-2006   #13
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Re: power loss!

A resistance check (on both primary & secondary windings) on a ignition coil will only prove a open circuit,nothing else! As I stated since coils faults are normally due to breakdown under load resistance checks are useless,unless of course you have a open circuit in the windings however this would be obvious as the coil wouldn't produce a H.T. output,i.e.no spark.

p.s.I have been a auto electrician for 19yrs (with many different manufacturers) so I know about coils
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Old 28-07-2006   #14
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Re: power loss!

OK not getting into an argument here, you deal in small coils i deal in big ones

all i'll say is section 5B of the Haynes if you have a coil that is NFG and you have been told there is a problem with one this will help identify the potentially duff one.
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Old 28-07-2006   #15
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Re: power loss!

The coil can 'send' a problem to the ECU in as much as the unburnt fuel gets picked up by the lambda sensor and because the system can't sort it, it throws the light on.

This is a common cause of misdiagnosis. Code reader says lambda faulty. Change lambda, fault remains.

Cheers

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