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Leads or Coilpack? 

 

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 Post subject: Leads or Coilpack?
Posted: Mon Nov 05, 2012 11:22 am 
Stock as a Rock
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Age: 31

Posts: 182

Joined: 10th Jan 2007

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Ride: Mustang

Location: Newcastle
NSW, Australia

okay so I'm still having problems with my series 2 AU falcon. Basically whats happening is the engine has a miss at idle and under load. when i put my foot down all i get is hesitation and a complete lack of power. It is okay if you just baby it along and don't accelerate hard. At highway cruising speeds I get lurching at a constant acceleration (feels like im taking my foot of the accelerator and then pressing it on again).

The problem seems to get worse as the car warms up. It can also be difficult to start after not starting it for a day or so and i have to push on the accelerator while cranking to get it going.

Iv'e tried to check the leads, and what Ive noticed is when i pull the lead caps off the sparkplugs while the engine is running, cylinders 1, 3, 5, & 6 i can hear (clicking sound) and see it arching when i hover the end of the lead just above the sparkplug, however on cylinders 2 and 4 it does not. We have a second AU2 falcon thats running fine and i did the same on it and all 6 leads arced when hovered above the plug.

Does this sound like it would be the leads or the coilpack? or should i just replace both at the same time? Also is there anything else it could be? could it possibly be the fuel pump?

Any help much appreciated, its doing my head in :(
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 Post subject: Re: Leads or Coilpack?
Posted: Mon Nov 05, 2012 11:57 am 
Technical Contributor
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Age: 60

Posts: 6817

Joined: 22nd Jun 2005

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Ride: EF Fairmont

Location: Campbelltown
NSW, Australia

Sounds like your Coil Pack is on the way out, Could be leads but sounds more like coil pack. Change your leads and coil pack.
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 Post subject: Re: Leads or Coilpack?
Posted: Mon Nov 05, 2012 12:00 pm 
Getting Side Ways
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Age: 39

Posts: 843

Joined: 20th Feb 2010

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Ride: AU Fairmont Ghia

Location: Elizibif Norf (Local Spelling!!)
SA, Australia

Yes it does sound an awful lot like leads or coil pack. I had the same issue with my EF. However as I changed both the leads and coil pack at the same time so I can't give you a definite 'it was A or B' but it sorted the issue of hesitation and lurching. (Feels almost like trans slip)
I had also changed the fuel filter initially as I thought it was blocked and the source of the problem.. but no.

Best advice I can offer is to swap the leads from the 2nd AU to the one with the problem as a method of diagnosis. If it goes away, cool! You just need a new set of leads. If that doesn't clear it up you need to replace the coil pack.. and it's in a prick of a spot. :)

 

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Au Fairmont Ghia
My (Old) 95 EF Wagon

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 Post subject: Re: Leads or Coilpack?
Posted: Tue Nov 06, 2012 7:32 am 
Getting Side Ways
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Posts: 836

Joined: 1st Apr 2005

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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

+1 to swapping two leads from the "good" AU2. It is more likely to be the leads.

The coil pack is basically three coils, each coil firing two cylinders that are 360 crank degress apart in the firing order. The firing order is 1-5-3-6-2-4. If one of the coils was failing, it would tend to affect the pairs 1 and 6, 5 and 2, or 3 and 4. As cylinders 2 and 4 are fired by separate coils (and 5 and 3 on the same coils are OK), it is unlikely to be the coil pack.

Hope this helps.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: Leads or Coilpack?
Posted: Wed Nov 07, 2012 7:55 am 
Stock as a Rock
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Age: 31

Posts: 182

Joined: 10th Jan 2007

Gallery: 2 images

Ride: Mustang

Location: Newcastle
NSW, Australia

Thanks guys, turns out was the leads. Replaced them yesterday problem solved :)
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