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back firing 

 

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 Post subject: back firing
Posted: Sun Feb 18, 2007 8:48 pm 
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hey all

a mate of mine just put a stage 2 crow cam in his ef on gas and since than it just back fires heaps how can he tune it so it dont do it any more (runs fine on petrol)

 

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mods: pacemaker extractors, 2.5in red back ,lowered with pedders 17" rims, extreme h/d ceramic clutch, 3.45 ef lsd, and rear brakes, clear indicators, ef thermo's, stage 2 crow (daily)
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Posted: Sun Feb 18, 2007 9:36 pm 
Parts Gopher
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Hey, yeah that would be my car. Its just got the extractors & 2.5"exhaust. Now the crow cam (2222519) is in, runs ok on petrol but idle's very low, but on LPG it has a low idle is constantly backfiring and blowing the crap out of my intake pipe/airbox (its currently held together by tape!) Any help would be great!

Last edited by sammyb on Mon Feb 19, 2007 12:57 am, edited 1 time in total.

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Posted: Sun Feb 18, 2007 9:57 pm 
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youdd need to get your gas system tuned, what sort of gas system are you running because some are easy to tune yourself.

ive had two cams in my car now and neither hae had an issue with gas, just needed slight tune tweeking to work without stalling.

 

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Posted: Sun Feb 18, 2007 10:21 pm 
Parts Gopher
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Just had a look, its a GASTEC FP30.

Here's a few pics, hope they can help!

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I've also noticed it idle's rather rough/stalls on petrol at times also, could that have anything to do with the problem?

Thanks again, Sam
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Posted: Mon Feb 19, 2007 3:39 pm 
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Any ideas anyone??
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Posted: Sun Mar 04, 2007 2:56 pm 
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gas need s a stronger spark and clean air try your plugs leads and air filter
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Posted: Thu Mar 22, 2007 6:07 am 
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Any reason why it would start backfiring right after i put the new cam in?? It never backfired before.
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Posted: Thu Mar 22, 2007 12:46 pm 
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With a lower vacuum on idle, etc you are not getting enough fuel to flow. It is definitely a fuel problem if it happened when changing cams. If you know which is your idle bypass on the LPG converter I would open it up 1/8th of a turn at a time. The idle bypass is normally quite sensitive so only do small movements.

Then go and get it tuned properly.

cheers
Scott

 

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Posted: Thu Mar 22, 2007 2:24 pm 
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You can use that processor to tune it spot on, it's a shame it's mounted in the engine bay, i have a plug in job so i can get the mixtures right as i drive it.
Check the LPG tuning thread, you'll see pics i've put in there of the std power valve and stepper motor setup, to get it right that needs to be adjusted, i'd say you're definately running too lean.
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