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AU 6 Auto - Misfire - COIL? 

 

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 Post subject: AU 6 Auto - Misfire - COIL?
Posted: Wed Feb 08, 2006 9:09 pm 
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Location: Sydney
NSW, Australia

Vehicle: 98 AU Series 1 6CYL Auto.

Problem: It is missing a bit at Idle and quite noticeable under power - my wife tells me it is more noticeable when the engine is warm.

What I have done: Replaced spark plugs, Air Filter, Fuel Filter.

Tonight, I thought it was time to check the spark getting to the ends of the leads at the plug - at night I noticed that the spark at CYL 2 and 5 is much much weaker than any of the others. I can see the leads run over to between the cylinder head and the inlet manifold, so I cant see the coil pack.

QUESTION: does cyl 2 and 5 share the same coil pair? how do I replace the coil pack, or is there a coil pack to replace? What is this likely to cost? I will check it out in the workshop manual, but I cant locate that right now either!

Am I along the right lines here? I would have suspected a lead, but two out of the six are showing the same symptom (according to the firing order, 2,5 sounds right?

Thanks, James.
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Posted: Wed Feb 08, 2006 9:16 pm 
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first thing i would do mate is replace all the leads.
the coild pack is just under the inlet manifold and yes its a prick to get to you need patience and long skinny arms, easy way to do it is to remove the airbox and piping to give you some room under there the number are marked on the coil pack for each lead.
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Posted: Wed Feb 08, 2006 10:31 pm 
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Ride: 2000 AU II Fairmont Ghia

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from memory its 1,6 2,5 3,4... Its almost certainly your leads... i had the same issue in my car... it was as though traction control was going when i was accelerating, but it was just missing all over the joint! easy as pie to fix, just replace the leads one by one as they are a tad difficult to get at...

 

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Posted: Wed Feb 08, 2006 10:50 pm 
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Ride: 2000 Au wagon

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shouldn't it be 1 5 3 6 2 4

 

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Posted: Wed Feb 08, 2006 10:51 pm 
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are we talking firing order, or coil pack order? i was referring to coil 1 has leads 1 and 6... i think anyways

 

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Posted: Wed Feb 08, 2006 10:54 pm 
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um yeah,,good point,,i'm talking fireing order but i think the coils maybe wired differently.

wheres frank,he'd know.

 

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Posted: Wed Feb 08, 2006 10:56 pm 
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i am pretty sure the coul packs are wired like i said... but then again, my manual has become one really thick page after the rains, so i really cant say :S

 

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Posted: Wed Feb 08, 2006 10:57 pm 
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google is useless.

 

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Posted: Wed Feb 08, 2006 11:02 pm 
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Looking directly at the coil pack assembly with the spark plug wire towers at the upper edge, from left to right, the order is 1&4, 6&3, and 2&5. Cylinders 1,3,5 are near the firewall. Cylinders 2,4,6 are next to the radiator.

does this sound right

 

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Posted: Thu Feb 09, 2006 12:04 am 
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when i changed my leads the coil was like this looking side on from passenger side at side of block

RAD |1 2 3| FIREWALL
.........|6 5 4|

 

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Posted: Thu Feb 09, 2006 10:45 am 
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Ride: Au Falcon with TE50 Bodykit

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VIC, Australia

Welcome to the world of the Au falcon. Ive got the same problem with my fairmont series 1. The damn thing misses on idle only when its hot and it not a constant miss. Its all ova the joint. Ive changed sparkies, leads, gve it to ford to check on their computer and they said all the sensors were fine but they said they could feel the miss. They also said that it was idling lower that normal which means its compensating somewhere else.

This miss does give the car a bit of a flat spot. Ive even taken the oxygen sensor out and cleaned it and put it back in but no go.

I did notice when i pulled each lead out and put em back that Number 5 made very little difference as in it idled almost the same when the lead was unplugged.

No sure on whats goin on either. Some tell me its my crank sensor not sending the correct signal to the ecu thus the valves are not opening on time/when they should.

But what is s**t me is dat it does it only when its hot and the miss is not constant. It misses then its fine and then does it constantly and then stops so yeh.

HELLLLLPPPP!!!!!!!!!!!!

 

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Posted: Thu Feb 09, 2006 10:46 am 
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O and to make it more noticible ive got a 2.5 cat back exhaust and u can clearly hear it miss

 

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Posted: Thu Feb 09, 2006 11:43 am 
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devil. The ECU does not control the valves. The valves are controlled by the camshaft which is chain driven off the crank.

Now that we've cleared that up, lets continue.

Are the coils in 2 pairs of 3 or 3 pairs of 2? If they are in 3 pairs of 2 and cylinders 2 and 5 share the same coil then I'd assume that that coil is dead or dying. Anyway get yourself a spare set of leads and change leads 2 and 5. If they still have a weak spark then its definitely the coil.
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Posted: Thu Feb 09, 2006 5:26 pm 
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its definately 3 pairs of 2

 

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 Post subject: UPDATE
Posted: Thu Feb 09, 2006 5:49 pm 
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Location: Sydney
NSW, Australia

UPDATE..

I have a new set of leads and a new coil pack. Going on the markings of the coil pack, 2 and 5 are shared, so I am pretty confident this is the problem. For the extra $50 I am doing the leads at the same time.

Now, I have the car on car stands and I can see the coil pack, I have to ask, WHY THE FLICK DID FORD PUT IT THERE!!!! I have no idea how I am going to get the old one out and less luck with getting the new one out! It is not visible from the top, only the bottom, but the bolts are on top... please dont tell me the inlet manifoild has to come off??

I cant even get a socket extention bar down there....

Any hints, please?
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