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miss fireing 

 

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 Post subject: miss fireing
Posted: Mon Dec 13, 2010 3:09 pm 
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Location: Craigieburn
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why is my el xr6 miss firing on gas?? wen i've got her on petrol runs fine but wen she's on gas and im stopped on a set of lights i need to put it back to neutral as it vibrates thru the car in drive..any ideas??

 

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 Post subject: Re: miss fireing
Posted: Mon Dec 13, 2010 10:26 pm 
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plugs, leads and tune

LPG is incredibly hard on ignition systems, they need to be in good order.
And no just because it works on petrol doesn't mean it should work on LPG

 

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 Post subject: Re: miss fireing
Posted: Tue Dec 14, 2010 2:36 am 
Getting Side Ways
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do you think that a head gasket could be the problem aswell? because i've heard they can cause the same issue...

 

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EL xr6,standard a** au motor,hi-tech headers, 2 1/2inch red back,,Tikky kitted and wingless,Black GT-P's,on ultra lows and still too high

My Build: the-garage-f53/daniels-el-xr6-build-t100586.html

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 Post subject: Re: miss fireing
Posted: Tue Dec 14, 2010 8:04 am 
Getting Side Ways
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Ride: EA SVO, AU2 Forte

Location: Bendigo
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try the cheaper things first. like it's been mentioned LPG is hard on ignition systems. take it from me. my eb is on LPG. when i bought it, it ran like s**t. put some LPG plugs in and and new leads. all sweet.

make sure you put lpg plugs in it

 

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 Post subject: Re: miss fireing
Posted: Wed Dec 15, 2010 1:09 am 
Getting Side Ways
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Location: Craigieburn
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should i go standard leads or 10mm??

 

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EL xr6,standard a** au motor,hi-tech headers, 2 1/2inch red back,,Tikky kitted and wingless,Black GT-P's,on ultra lows and still too high

My Build: the-garage-f53/daniels-el-xr6-build-t100586.html

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 Post subject: Re: miss fireing
Posted: Thu Dec 16, 2010 12:02 am 
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Buy the best leads you can afford and buy LPG-specific plugs with a gap of between 0.7-0.9mm. While you're at it, check the rest of your ignition - distributor etc.

 

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 Post subject: Re: miss fireing
Posted: Fri Dec 17, 2010 10:58 pm 
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wild-el wrote:
should i go standard leads or 10mm??


get a set of Eagle series 2 eliminators. I had topgun LPG leads but the boots didn't seals around the plugs properly, in wet weather the spark would track down the outside of the plug cause a missfire and common backfiring. I ended up fitting a set of MSD plug boots to them and replaced the terminals at the same time (topgun need to buy a better crimping tool). haven't had any issues since.

I've never had good results with Bosch and LPG.

 

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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 7:25 pm 
Getting Side Ways
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nahh i definatly think its miss firing because of the head gasket.i did my road worthy today and the mechanic said i've got abit of an oil leak near the head.but im not losing any water.the oil leak is on the inlet side and there's abit of a water stain under neath the extractors side..

 

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EL xr6,standard a** au motor,hi-tech headers, 2 1/2inch red back,,Tikky kitted and wingless,Black GT-P's,on ultra lows and still too high

My Build: the-garage-f53/daniels-el-xr6-build-t100586.html

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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 7:50 pm 
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so why ask for help?

 

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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 7:54 pm 
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tickford_6 wrote:
so why ask for help?


Yeah?

Would love to personally know how a leaking head gasket causes a back fire...

Esp if nothing is leaking out... You done a compression test on it to know that the heap gasket is leaking from a cylinder?

 

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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 8:03 pm 
Getting Side Ways
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wel tickford_6 im asking myself te same question.i mean if the spark plugs and leads and dizzy arent the problem then i really dont no why the head gasket would cause it...i guess i jut have to get it out of the way too...

 

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EL xr6,standard a** au motor,hi-tech headers, 2 1/2inch red back,,Tikky kitted and wingless,Black GT-P's,on ultra lows and still too high

My Build: the-garage-f53/daniels-el-xr6-build-t100586.html

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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 8:06 pm 
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wild-el wrote:
wel tickford_6 im asking myself te same question.i mean if the spark plugs and leads and dizzy arent the problem then i really dont no why the head gasket would cause it...i guess i jut have to get it out of the way too...



have you changed the leads, dizzy cap rotor and plugs at all??
closed the gaps like others have said??

otherwise your just guessing the leads are not the problem!
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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 8:07 pm 
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have you checked the timing?

Have you checked the coil with HEI test plug?

Have you checked the button and the cap for wear

Have you measured the lead resistance?

Snow your asking yourself if its the head gasket?

wild-el wrote:
nahh i definatly think its miss firing because of the head gasket.


You sound so sure here though?

 

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93 Red ED 5spd Manual Build Thread

Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 8:10 pm 
Getting Side Ways
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Age: 25

Posts: 1260

Joined: 11th Dec 2010

Ride: EL xr6

Location: Craigieburn
VIC, Australia

well mechanics are telling me if its not electrics then its the head gasket no clue why....and i have signs of a head gasket leak...

 

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EL xr6,standard a** au motor,hi-tech headers, 2 1/2inch red back,,Tikky kitted and wingless,Black GT-P's,on ultra lows and still too high

My Build: the-garage-f53/daniels-el-xr6-build-t100586.html

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 Post subject: Re: miss fireing
Posted: Tue Dec 21, 2010 8:11 pm 
Technical Contributor
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Age: 28

Posts: 3705

Joined: 27th Sep 2006

Gallery: 20 images

Ride: ED Falcon

Power: 133 rwkw

Location: Leeton
NSW, Australia

So you've checked compression to know its bad?

They have checked compression to know its bad?

You know its not the electronics how?

Could be the LPG computer for all you know? Has it been diagnosed if its possible?

 

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93 Red ED 5spd Manual Build Thread

Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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