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ea_5_spd
Fordmods Stock as a Rock
Age:22
Posts: 184
Joined: 01 Sep 2005
Location: kadina SA, Australia
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 Posted: Sun Feb 18, 2007 7:48 pm Post subject: back firing |
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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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sammyb
Fordmods Parts Gopher
Age:19
Posts: 82
Joined: 29 Apr 2005
Location: Adelaide SA, Australia
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| Posted: Sun Feb 18, 2007 8:36 pm Post subject: |
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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 Sun Feb 18, 2007 11:57 pm, edited 1 time in total |
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rushed
Fordmods Junkie
Posts: 2756
Joined: 22 Sep 2005
Location: Melbourne VIC, Australia
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| Posted: Sun Feb 18, 2007 8:57 pm Post subject: |
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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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sammyb
Fordmods Parts Gopher
Age:19
Posts: 82
Joined: 29 Apr 2005
Location: Adelaide SA, Australia
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| Posted: Sun Feb 18, 2007 9:21 pm Post subject: |
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Just had a look, its a GASTEC FP30.
Here's a few pics, hope they can help!
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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sammyb
Fordmods Parts Gopher
Age:19
Posts: 82
Joined: 29 Apr 2005
Location: Adelaide SA, Australia
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| Posted: Mon Feb 19, 2007 2:39 pm Post subject: |
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| Any ideas anyone?? |
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hard driver
Fordmods Newbie
Age:33
Posts: 13
Joined: 04 Mar 2007
Location: adelade SA, Australia
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| Posted: Sun Mar 04, 2007 1:56 pm Post subject: |
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| gas need s a stronger spark and clean air try your plugs leads and air filter |
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sammyb
Fordmods Parts Gopher
Age:19
Posts: 82
Joined: 29 Apr 2005
Location: Adelaide SA, Australia
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| Posted: Thu Mar 22, 2007 5:07 am Post subject: |
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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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MacGyver
Fordmods - Getting Side Ways
Age:29
Posts: 513
Joined: 23 Dec 2005
Location: Toowoomba QLD, Australia
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| Posted: Thu Mar 22, 2007 11:46 am Post subject: |
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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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Walker
Technical Contributor
Age:37
Posts: 8581
Joined: 05 Nov 2004
Location: Melbourne VIC, Australia
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| Posted: Thu Mar 22, 2007 1:24 pm Post subject: |
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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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