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au falcon backfiring and really bad misfire 

 

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 Post subject: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 3:36 pm 
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Location: gladstone
QLD, Australia

hi guys ,a few weeks ago car start to run fuelly and stalling.slowly got worse now it is almost undrivable

have replaced leads ,coil pack ,plugs,injectors,fuel filter, 02 sensor
cleaned tb and isc with carby cleaner

if you take off injector plugs 123 and 5 car starts to stall
if you remove 4 and 6 it doesn't make a difference(car still runs rough)

done compression test and all seems fine

any ideas what it could be
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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 3:41 pm 
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Blocked cat?

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 4:21 pm 
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Ride: AU VCT,68 LANE,84 COURIER,

Location: brisbane
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fuel reg.

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 4:23 pm 
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Blown head gasket?

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 4:28 pm 
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93EB wrote:
Blown head gasket?


if a compression test was ok?

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 5:10 pm 
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Possibly map sensor?? can cause them to run like s**t, spluttering and dumping fuel etc

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 5:54 pm 
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dead cat in the airbox.

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 5:57 pm 
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Ride: AU VCT,68 LANE,84 COURIER,

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Where is the MAP sensor? In the manifold? MAF sensor? There is a sensor below the throttle body you can clean it by removing the throttle body and you can see it sticking out inside the manifold (hard to remove sensor has security keys on early models) I cleaned this a few times before i decided to change my fuel reg. Now it just stays clean cause my car is no longer a petrol tanker, best fuel economy mod ever done ! 320 to a tank now high 500s,and its still not tuned.

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 6:05 pm 
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Lol just realised it was an AU, thought it was an EL going the OP's username i.e elrob

EL's have the map sensor mounted up near the firewall but on AU's i believe the map sensor is under the throttlebody, so Autofast2, id say that would be the sensor right there

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 6:09 pm 
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Yeah but my scan tool calls it a MAF sensor weird. You could always unplug it and see what happens if its still crap then BINGO you found it,or not.

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 8:25 pm 
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its not a blocked cat as i had it changed the other day.if its map sensor then why would it only seem to be no.4 and 6 that are not firing
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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Wed Sep 16, 2009 9:49 pm 
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Ride: AU VCT,68 LANE,84 COURIER,

Location: brisbane
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Try the coil pack?

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Thu Sep 17, 2009 12:09 am 
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vac leaks or dead fuel reg

 

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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Thu Sep 17, 2009 9:12 am 
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Coil packs on AU are a problem also they like to blow inlet gaskets. But it sounds like a coil pack problem.
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 Post subject: Re: au falcon backfiring and really bad misfire
Posted: Thu Sep 17, 2009 9:37 am 
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Location: gladstone
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i tried the coilpack it did squat
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