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 Post subject: Spark Plugs
Posted: Tue Apr 22, 2008 6:03 pm 
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hey guys, after changing my spark plugs today i noticed that a couple or them were worn to the sh** house, while others didnt look very worn out at all.
Any one have any ideas why this could be. On a some what irrelevent note, the engine does seem to be missing quite a bit especially in the lower rev range and i cant figure out why.

 

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Posted: Tue Apr 22, 2008 6:16 pm 
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pre crossflows can leanout due to induction channeling,

in otherwords, state details of alleged car!

 

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Posted: Tue Apr 22, 2008 7:11 pm 
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4.0L EL falcon on LPG and petrol, it misses a fairbit on LPG but is pretty much undrivable on pretrol (injectors possibly??)

 

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Posted: Thu Apr 24, 2008 9:46 pm 
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ideas anyone?

 

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Posted: Fri Apr 25, 2008 3:04 am 
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oxy sensor damaged or the thing is running way lean

 

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Posted: Fri Apr 25, 2008 4:13 pm 
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well in that case, i have an oxy sensor off an EB, any chance that itll fit in place?

 

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Posted: Sat Apr 26, 2008 1:13 am 
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hmm. should

i'd be checking the injectors and fuel system (incl. fpr) to make sure your getting the right amount of fuel going through.

then try to figure out whats caused the overall damage. (could be just old plugs...)

 

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Posted: Sat Apr 26, 2008 11:45 am 
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LPG is hard on Spark Leads, when were they last replaced ?
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Posted: Sat Apr 26, 2008 12:36 pm 
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i think leads would be close to 2 years old now, the odd thing is that it runs ok on LPG, i think id be leaning towards injectors, is there any way of testing them?

 

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Posted: Sat Apr 26, 2008 7:01 pm 
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na, but i'll just about say that you need a set of recos or a freshen up of the ones you got. check the pressure pipe for a propper seal too from the fuel reg. seen a few with holes worn in the back

 

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Posted: Sat Apr 26, 2008 7:19 pm 
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I was thinking about putting in a set of AU injectors but im not too sure what there worth, also ive never replaced jectors before so not sure if its a big job.
also where would i find this pressure pipe?

 

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Posted: Sat Apr 26, 2008 10:23 pm 
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Check your timing.

 

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Posted: Sat Apr 26, 2008 10:46 pm 
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get iridiums
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Posted: Sun Apr 27, 2008 12:25 am 
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back of the fuel rail on the fuel presure reg, theres a small back pipe

take it off and suck on it, if its not holding pressure, replace it

 

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Posted: Sun Apr 27, 2008 1:56 am 
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hmmm.. not sure about the iridiums, i was told there a waste of money as they burnout just as quickly on LPG (I put normal NGK's in the other day), thanks anyway though.
Ill check the pressure hose tomorrow but I'm finding it increasingly difficult to narrow it down to one or 2 things. So far it looks as if ive got a long list of things that may need replacing. If i got my mechanic to run a diagnostic test on the ECU would it help me narrow the problem down a bit?

cheers boys, appreciate the input

 

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