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EF occasional missfire 

 

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 Post subject: Re: EF occasional missfire
Posted: Wed Dec 12, 2012 3:55 pm 
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Ride: EF Falcon, 5 Speed

Location: Adelaide
SA, Australia

I've had this happen to me and for some reason it managed to screw up the ECU. One night it got so bad that it began to stall itself as in it would run for a couple of seconds and then just stop/die.

We had some code on the dash light which was something to do with the air bag and the unit that needed to be replaced was completely missing. Fixed that up and replaced the ECU, leads, coil-pack, spark plugs and everything ran fine again and I haven't had a misfire or shudder since.
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 Post subject: Re: EF occasional missfire
Posted: Wed Dec 12, 2012 4:02 pm 
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Ride: EF Gli wagon

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NSW, Australia

Ta for that.
'Some code on the dash light'....what do you mean?*
Yeah....just ordered a new coil pack.
Yes, yes, I should have done that at the beginning, and not got a second-hand one, let's move on....anyway, I'll put it in and get the code looked at.
I received some flak for getting a mechanic to put the coils in, but someone told me it was a horror job without a hoist...so, how easy are they to put in? Will ramps do?

*my library has an EF manual, so I'll going to get it tomorrow and have a look, but I've found the descriptions I've heard here about things are easier to understand.

 

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EF GLi Wagon. Burgundy. Gas shocks. Rear sway bar. Nice stereo & speakers. Factory bull bar. Driving lights. Roof racks. Great car. 2nd owner. 147,000km.

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 Post subject: Re: EF occasional missfire
Posted: Fri Dec 14, 2012 12:12 pm 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

If you have new ignition leads and have a multimeter available, you can check your coilpack without touching it. The pack has three coils, each firing two cylinders; the pairs are 1 and 6, 2 and 5, and 3 and 4. If you pull the leads off these pairs of plugs, you can test the coil they are both attached to, as they form a loop. The actual resistance (ohms) of each loop isn't too important, but it should be reasonably consistent across the three. I would guess that if they vary by more than 10-15%, your coilpack is on the way out. You can expect a loop with longer leads to have slightly higher resistance.

You can replace the coilpack with the car on the ground if you remove the airbox, but it's still a job and a half. It would probably be a little easier with the car on stands/ramps, but the crossmember, engine mount, and air con compressor will likely still be in the way. There is no getting around the fact that the coilpack location was thought up by some sadist.

 

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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: EF occasional missfire
Posted: Fri Dec 14, 2012 2:39 pm 
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Many thanks.
When you say test...you mean putting the multimeter probes in the two spark plug terminals (in the leads)?
And from the sounds of it, if I need to change the coils (might as well as I've paid for the things), I'll pay someone to do it.

 

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 Post subject: Re: EF occasional missfire
Posted: Fri Dec 14, 2012 3:17 pm 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

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Exactly. You test resistance from the spark plug end of one lead to the spark plug end of the other, so it's actually measuring the resistance of the coil plus both leads. This only works with new(ish) leads or leads you have tested already. Otherwise, you have no way of knowing whether it's one of the leads or the coil that's faulty, and you are no f@rt ahead.

I don't want to discourage you from doing the work yourself, as it can be very rewarding. But I find the coilpack to be the "least rewarding" thing to work on. Maybe there's some trick or shortcut I'm not aware of. But I only do it myself because I'm cheap and stubborn - I refuse to let the car beat me. :D

 

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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: EF occasional missfire
Posted: Fri Dec 14, 2012 3:52 pm 
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Cool. I'll check it this weekend.
So, the 'least rewarding' eh?
Hear that sound? Yup, my EFTPOS card sliding out of my wallet! :wink:

 

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EF GLi Wagon. Burgundy. Gas shocks. Rear sway bar. Nice stereo & speakers. Factory bull bar. Driving lights. Roof racks. Great car. 2nd owner. 147,000km.

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 Post subject: Re: EF occasional missfire
Posted: Sat Dec 15, 2012 4:13 pm 
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Ride: ford ef2 xr6

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VIC, Australia

Coil pack not that hard to replace on ef 6 cylinder...as stated above,remove air filter box for better access and get yourself some long socket extensions so you can remove mounting bolts by lowering socket extension bar down between intake manifold runners.As for your occasional misfire,best to get a code check done first to see if any codes are present,as problem may not be caused by coil pack,especially seeing as it is still there after changing to another coil pack.Gregorys manual shows how to build your own code reader for under $10 and how to use it.If misfire is random,also check fuel pressure regulator is not leaking due to split internal diaphragm,just disconnect vaccuum hose from regulator,and suck on it,if you can taste/smell petrol then it is split and needs replacing.Also check o rings on injectors are in servicable condition and not leaking.One other thing to check is that correct spark plugs are fitted as too cold a plug may also cause an occasional misfire.
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 Post subject: Re: EF occasional missfire
Posted: Mon Dec 17, 2012 10:08 pm 
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Paul W - have you tried disconnecting the cam phase sensor yet? - mine is still running fine and sweet with the cam phase sensor disconnected - ie. small plastic bag over the plug and it lashed out of the way with a cable tie.

I must quit being lazy and check the position of the phase sensor in case the whole issue causing intermittant misfiring / stuttering with it connected is from the position being just out of tolerance - ie. blade passing the sensor at the wrong time which is clashing with the timing at certain ignition advance or something.

In any case, it's running fine with it disconnected.

 

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96 EF Auto GLi - Bilstein Shocks - Adjustable Front sway bar - JMM Cam - TI Perf J3 - TCI 2500/3000 stall converter. 2015 Jeep Cherokee Trailhawk.

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 Post subject: Re: EF occasional missfire
Posted: Sun Jan 13, 2013 10:05 am 
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I'll be removing it this week, and checking the codes.
Been very busy lately, and as the car still runs fine, it's been way down the list of Things To Do.
Also fitted a new coil pack, but no improvement.

 

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EF GLi Wagon. Burgundy. Gas shocks. Rear sway bar. Nice stereo & speakers. Factory bull bar. Driving lights. Roof racks. Great car. 2nd owner. 147,000km.

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 Post subject: Re: EF occasional missfire
Posted: Sun Jan 13, 2013 10:35 am 
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Do give it a go - just disconnecting the plug and lashing it out of the way to see if it kills the problem is easy enough to do - bagging the plug would be a good idea if you end up leaving it unplugged for any amount of time.

That's all I've done - disconnected the plug - ie. the rest of the shaft/hsg/sensor etc. is all still in place as normal.

My phase sensor housing / shaft / blade unit seems to be set correctly so all I can think is that the sensor itself - which I fitted NEW early last year - is faulty - so my next step is to get another sensor and hook it all up again. Tho as I say, it seems to all be running fine without it.

 

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96 EF Auto GLi - Bilstein Shocks - Adjustable Front sway bar - JMM Cam - TI Perf J3 - TCI 2500/3000 stall converter. 2015 Jeep Cherokee Trailhawk.

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 Post subject: Re: EF occasional missfire
Posted: Sun Jan 13, 2013 12:30 pm 
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Well, if that's all I have to do....I'll see if I have time today.
Cheers.

 

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EF GLi Wagon. Burgundy. Gas shocks. Rear sway bar. Nice stereo & speakers. Factory bull bar. Driving lights. Roof racks. Great car. 2nd owner. 147,000km.

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 Post subject: Re: EF occasional missfire
Posted: Thu Jan 17, 2013 9:32 am 
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I was going to remove the camp phase sensor, but as the codes were to be checked yesterday, waited for the result.
Codes checked...nothing. It seems all is well on that front.
So, I figure removing the cam phase sensor plug would be a waste of time, if it's not registering a problem on the codes?
I'll go back through the suggestions here and see what non-electrical thing can be done.

 

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EF GLi Wagon. Burgundy. Gas shocks. Rear sway bar. Nice stereo & speakers. Factory bull bar. Driving lights. Roof racks. Great car. 2nd owner. 147,000km.

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 Post subject: Re: EF occasional missfire
Posted: Sun Jan 20, 2013 12:08 pm 
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I hadn't pulled codes etc. so can't comment as far as that goes - but all I'll say is that it takes a couple of seconds and is absolutely harmless to pull that plug and eliminate CMP as being the issue. Cable tie the plug out of the way if ur in doubt whether it might swing about and hit the belt etc.

 

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96 EF Auto GLi - Bilstein Shocks - Adjustable Front sway bar - JMM Cam - TI Perf J3 - TCI 2500/3000 stall converter. 2015 Jeep Cherokee Trailhawk.

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 Post subject: Re: EF occasional missfire
Posted: Sun Jan 20, 2013 2:09 pm 
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I actually tried today...thing would not come out....just pulls out? No little clips to watch for?
Unfortunately, it's at a distance that's no good for my reading glasses or my usual ones, so cannot see it properly.
Fading eyesight is a ........!!!!!!

 

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EF GLi Wagon. Burgundy. Gas shocks. Rear sway bar. Nice stereo & speakers. Factory bull bar. Driving lights. Roof racks. Great car. 2nd owner. 147,000km.

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 Post subject: Re: EF occasional missfire
Posted: Mon Jan 21, 2013 12:09 pm 
Getting Side Ways
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HAha - I hear ya! - just breaking in my first set of progressive focals myself... :(

There is a clip on that plug - on top and you lift it at the CMP sensor end - but also the little bug&er has a triple ring rubber/silicon seal inside the plug that causes a fair amount of stiction - mine always comes off with that rubbery suctioning "POP" sound like a good plug lead.

 

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96 EF Auto GLi - Bilstein Shocks - Adjustable Front sway bar - JMM Cam - TI Perf J3 - TCI 2500/3000 stall converter. 2015 Jeep Cherokee Trailhawk.

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