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Testing ignition coil 20vt le #1632298
06/05/2019 22:24
06/05/2019 22:24
Joined: Aug 2018
Posts: 10
Belgium
Jan Offline OP
Newbie
Jan  Offline OP
Newbie

Joined: Aug 2018
Posts: 10
Belgium
Hi everyone

After getting the engine back working, i have noticed the power isnt really there. My mechanic tells me there probably is a faulty ignition coil. It drives ok, but once above 3000rpm, not a lot happens, and when giving it full throttle, the car has a tendancy to need to take its breath. So need to release throttle a bit before it picks up again.

I have got a new Bosch ignition coil, but wanted to know if there is a scientific approach to knowing which coil is malfunctioning rather than just swapping one by one and testdriving?

Thanks!

Re: Testing ignition coil 20vt le [Re: Jan] #1632307
07/05/2019 08:08
07/05/2019 08:08
Joined: Aug 2007
Posts: 819
Germany
neil_r Offline
Enjoying the ride
neil_r  Offline
Enjoying the ride

Joined: Aug 2007
Posts: 819
Germany
The traditional way if no codes are available is to let the car idle with one coil disconnected. Disconnect a good coil and the revs drop. Disconnect a "misfiring" coil and the revs rise. Not absolutely foolproof, but if the coil is bad enough to cause misfire, you will identify it.

I disconnected and connected coils with the engine off. I didn't think it was a good idea to do it with the engine running.


1997 20V
2000 V6 manual S-Type and 2011 5.0 XKR
2016 Tucson 1.6T AWD
2018 Mazda2 GT
Re: Testing ignition coil 20vt le [Re: Jan] #1632385
09/05/2019 12:06
09/05/2019 12:06
Joined: Feb 2006
Posts: 111
Newbury
MIB Offline
Club Member 1579
MIB  Offline
Club Member 1579
On a journey

Joined: Feb 2006
Posts: 111
Newbury
There should be 0.4 ohm resistance between the contacts (primary coil resistance). If you have a multimeter you could do this check.


[Linked Image]
Bog standard!
Re: Testing ignition coil 20vt le [Re: Jan] #1632448
11/05/2019 18:46
11/05/2019 18:46
Joined: Aug 2018
Posts: 10
Belgium
Jan Offline OP
Newbie
Jan  Offline OP
Newbie

Joined: Aug 2018
Posts: 10
Belgium
Thanks both, will give it a go!


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