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EA falcon misfire 

 

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 Post subject: EA falcon misfire
Posted: Tue Mar 04, 2014 12:33 pm 
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G'day back again with yet another problem with the falcon, how surprising... not. Anyway there appears to be a misfire at idle and with minimal to no load, with full load she sounds nice and goes good. I can't see why it'd misfire with good leads, good new coil, ( 2nd hand dizzy, new rotor / cap - red flag ) good new spark plugs, new air filter, new fuel filter, new fuel pump ( 2 sets of injectors do the same thing ) new inlet gasket, new aux shaft ( can't see it being mechanical as some times it's crystal smooth ) Tried ECU reset 2 times and the list goes on.

Not to mention fuel economy is doghouse s**t. Anyway here's a video for more in depth details of the misfire.

http://www.youtube.com/watch?v=JBVHu0rO ... e=youtu.be

 

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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 2:12 pm 
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02 sensor.. could be pegged rich/lean?

 

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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 3:28 pm 
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Tried a known good 02 sensor and no luck.

 

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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 6:04 pm 
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GrannyFalcon82 wrote:
Tried a known good 02 sensor and no luck.


Did you reset the ECU after fitting the good O2 sensor?
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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 7:05 pm 
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Will do, brb.

 

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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 7:13 pm 
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What's the best method of reset. I've seen multiple such as:

(N with loads off
N with loads on
Drive with Loads on
Drive with Loads off ) *2 minutes

Also


(N with aircon off
N with aircon on
Drive with aircon off
Drive with aircon on) *2minutes

Is there really much of a difference?

 

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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 7:24 pm 
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i think he means resetting by unpluging one lead from the battery
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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 7:27 pm 
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Yes, after letting the car sit for 30 minutes or so with the leads off and then doing those things... that's what i was referring to.

 

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 Post subject: Re: EA falcon misfire
Posted: Tue Mar 04, 2014 8:05 pm 
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well that did jack s**t, tried looking for sparklead arcs, couldn't see any in the pitch black besides a little glow / interference down under the inlet manifold ( not ontop of the distributor ). Will attempt some more diagnosis tomorrow.

 

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 Post subject: Re: EA falcon misfire
Posted: Wed Mar 05, 2014 6:45 pm 
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Tried changing TPS ( with reset ) no different, disconnected temp sensor and map sensor, no difference. So i decided to go and change the sparkplug leads to some good ones i had laying about and still, no difference...

Beer time.

 

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 Post subject: Re: EA falcon misfire
Posted: Thu Mar 06, 2014 5:59 pm 
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Tried changing over the isc with a spare i had, still no good, i forgot to add, this problem only started after having to jump start the car with a portable jumpstarter, that probably opens a whole new can of worms.

 

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 Post subject: Re: EA falcon misfire
Posted: Fri Mar 07, 2014 11:14 am 
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I've discovered something a little bit concerning, the TPS black and orange wire are giving me a constant 4.95v. No change whatsoever if i were to touch the throttle. Wouldn't this tell the computer to be delivering fuel as if it were at WOT? Or will the inlet manifold pressures combat this?

Also this TPS is good, along with the other one. Any thoughts on this would be greatly appreciated.

 

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 Post subject: Re: EA falcon misfire
Posted: Fri Mar 07, 2014 1:20 pm 
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should have 0.7v +or- .2v between the green and black wires with the ignition on closed throttle. you might have a signal ground issue. i would unplug the manifold harness and test the ground between the plug and sensor, then from plug (other half) to ECU.

 

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 Post subject: Re: EA falcon misfire
Posted: Fri Mar 07, 2014 3:30 pm 
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mk, i was testing the wrong wire ( from memory i thought it was the friggen orange wire ) and testing 0.8v - 4v so i may need to adjust the tps to get around 0.7 v for closed throttle.

As far as the misfire goes i can only put it down to the distributor... Might swap it out for the new ebay dizzy i had ( I'll be changing the gear over, learned from that mistake )

 

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 Post subject: Re: EA falcon misfire
Posted: Fri Mar 07, 2014 9:48 pm 
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Changed over the dizzy, misfire is still there ( running rich as hell ) My only guess is that the jumpstart has buggered the ECU.

 

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