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bf 6 cyl backfire upon start up 

 

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 Post subject: bf 6 cyl backfire upon start up
Posted: Fri Jun 21, 2013 4:00 pm 
Getting Side Ways
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Ride: BF XR6,

Location: NEWCASTLE
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My bf has been backfiring upon start up, when this happens the car runs like the ignition timings out and stalls., I turn the car off and then back on and the problems gone again. Its not on gas so im not sure where the problems coming from. Could it be coil packs?

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Fri Jun 21, 2013 4:02 pm 
Getting Side Ways
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Ride: BA Falcon XT

Location: Smithfield
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Could be the HEGO or the Catalytic converter, they do play up a lot on the BA's.
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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Fri Jun 21, 2013 4:04 pm 
Getting Side Ways
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Papa Smurf wrote:
Could be the HEGO or the Catalytic converter, they do play up a lot on the BA's.

My cat colapsed so I gutted a week ago until I order another, could a gutted cat cause the problem? It was happening before hand

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Fri Jun 21, 2013 4:05 pm 
Getting Side Ways
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Ride: BA Falcon XT

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It could do, that sort of thing would interfere with the proper running of the car. BA's are more sensitive when it comes to emission controls.
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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Fri Jun 21, 2013 4:07 pm 
Getting Side Ways
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BA's also have issues with TPS, the thing on the side of the throttle body.
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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Fri Jun 21, 2013 4:08 pm 
Getting Side Ways
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Yeah i might order a new one asap, I know the engine lights on since I gutted it but i knew that was going to happen

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sat Jun 22, 2013 2:39 pm 
Getting Side Ways
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Ride: BF XR6,

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Ok so I replaced my fuel filter and rear exhaust gasket and the cars better. But I'm wondering is there some form of gasket that goes from the manifold to the cat section that needs replacing because it sounds like theres a leak there after ive had it off

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sat Jun 22, 2013 9:30 pm 
Getting Side Ways
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8R2Z 9A457 AA about $12.00. It is the gasket that goes between the two manifold halves. You can try to tighten it up first?
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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sat Jun 22, 2013 9:40 pm 
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Papa Smurf wrote:
8R2Z 9A457 AA about $12.00. It is the gasket that goes between the two manifold halves. You can try to tighten it up first?

its tight, but i hear a hissing or some sort of a air leak noise when i rev the car or its under load with a bit of throttle, but its not the rear gasket after ive replaced it because there would be noticable black marks around it where the airs passing out,
when i gutted the cat my father inlaw tigged the cat back on pretty good so i cant see that leaking?

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sun Jul 07, 2013 5:50 pm 
Getting Side Ways
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ok so just updating this, i have replaced my coils with brand new vdo branded ones, this has so far stopped my back firing upon start up but hasent changed fuel economy, ive purchased a new cat convertor bolt on piece off ebay(non genuine), the only code coming up on my scanner is the fact that my second oxy sensor is reading that ive gutted the cat(catylist error or something?)

also i have started running 95 octane fuel because i normally run 98 and this only made my economy worse, i havent been driving the car hard at all and its reading 13.8l/100km(some highway some round town) on 98 fuel and 15+l/100km on 95.
i replaced my spark plugs when i first bought my car with a set that came out of an xr6 turbo and they had only been ran a week before a colder set was purchased and i got them given to me.
its got me buggered where the problem is, the only mods are the gutted cat and an xr8 snorkel which isnt much bigger than stock

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sun Jul 07, 2013 7:17 pm 
Parts Gopher
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I thought n/a and turbo plugs were different?
That might be your problem, haha
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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sun Jul 07, 2013 7:18 pm 
Getting Side Ways
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Ride: BF XR6,

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dan_mac20 wrote:
I thought n/a and turbo plugs were different?
That might be your problem, haha

they were same when i pulled mine out and looked at the part numbers lol, unless some d***head had the wrong ones in mine in the first place

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sun Jul 07, 2013 7:24 pm 
Parts Gopher
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I thought the turbos had a smaller gap from memory. Maybe pm Smurf?
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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Sun Jul 07, 2013 7:32 pm 
Getting Side Ways
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Age: 25

Posts: 4599

Joined: 30th Aug 2010

Ride: BF XR6,

Location: NEWCASTLE
NSW, Australia

dan_mac20 wrote:
I thought the turbos had a smaller gap from memory. Maybe pm Smurf?

i rechecked the gap to standard spec

 

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BF XR6
xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: bf 6 cyl backfire upon start up
Posted: Mon Jul 08, 2013 7:48 am 
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Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
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your o2 sensor fault will stay there, as even though you changed the cat it still don't work as well as the genuine cat, meaning the aftermarket cat don't meet the emission the factory cat did..

so you need to trick the 02 sensor or fit a factory genuine cat or get a flash tune to change the range of the 2nd o2 or have it switched off in the tune..

and from memory the turbo runs a 1.1mm plug gap and the n/a runs a 1.3mm gap. but running the n/a with 1.1 gap wont cause a problem...

now you know what owning a b series is about... :lol:
that's why I don't own one... :P
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