Fordmods Logo

back firing 

 

Page 1 of 1 [ 9 posts ] 

 
 Post subject: back firing
Posted: Sun Feb 18, 2007 8:48 pm 
Stock as a Rock
Offline

Age: 37

Posts: 185

Joined: 1st Sep 2005

Ride: ea 5 spd

Location: kadina
SA, Australia

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)

 

_________________

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)
Image

Top
 Profile  
 
 
Posted: Sun Feb 18, 2007 9:36 pm 
Parts Gopher
Offline
User avatar

Age: 35

Posts: 86

Joined: 29th Apr 2005

Gallery: 8 images

Ride: E series falcon

Location: Adelaide
SA, Australia

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.

Top
 Profile  
 
 
Posted: Sun Feb 18, 2007 9:57 pm 
Fordmods Junkie
Offline
User avatar

Posts: 3083

Joined: 22nd Sep 2005

Gallery: 13 images

Ride: EF

Location: Melbourne
VIC, Australia

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.

 

_________________

Image
latest mod: A Service
MY BUILD THREAD

Top
 Profile  
 
 
Posted: Sun Feb 18, 2007 10:21 pm 
Parts Gopher
Offline
User avatar

Age: 35

Posts: 86

Joined: 29th Apr 2005

Gallery: 8 images

Ride: E series falcon

Location: Adelaide
SA, Australia

Just had a look, its a GASTEC FP30.

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

Image

Image

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
Top
 Profile  
 
 
Posted: Mon Feb 19, 2007 3:39 pm 
Parts Gopher
Offline
User avatar

Age: 35

Posts: 86

Joined: 29th Apr 2005

Gallery: 8 images

Ride: E series falcon

Location: Adelaide
SA, Australia

Any ideas anyone??
Top
 Profile  
 
 
Posted: Sun Mar 04, 2007 2:56 pm 
Fordmods Newbie
Offline

Age: 48

Posts: 13

Joined: 4th Mar 2007

Location: adelade
SA, Australia

gas need s a stronger spark and clean air try your plugs leads and air filter
Top
 Profile  
 
 
Posted: Thu Mar 22, 2007 6:07 am 
Parts Gopher
Offline
User avatar

Age: 35

Posts: 86

Joined: 29th Apr 2005

Gallery: 8 images

Ride: E series falcon

Location: Adelaide
SA, Australia

Any reason why it would start backfiring right after i put the new cam in?? It never backfired before.
Top
 Profile  
 
 
Posted: Thu Mar 22, 2007 12:46 pm 
Getting Side Ways
Offline
User avatar

Age: 45

Posts: 520

Joined: 23rd Dec 2005

Ride: EF Futura Wagon

Location: Toowoomba
QLD, Australia

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

 

_________________

If it doesn't fit, jam it. If that doesn't work use a hammer. - Engineers Motto

Top
 Profile  
 
 
Posted: Thu Mar 22, 2007 2:24 pm 
Getting Side Ways
Offline
User avatar

Age: 52

Posts: 8590

Joined: 5th Nov 2004

Gallery: 5 images

Ride: AU Fairlane 5.0, KE Laser, 01 Kw

Location: Melbourne
VIC, Australia

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.
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 9 posts ] 

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Fri Mar 29, 2024 9:23 pm All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names