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Location:
berala sydney
Registered:
November 2002
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help back firing on boost
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Mon, 05 May 2003 06:00
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hi all
got the iggte going like a rocket its in a hilux ute.Till i let a so called machanic have a look at the cold start idle.Now when the second turbo come on to boost it back fires and break down real bad. any one out there got any ideas what may be wrong.
thanks in advance knackers
 
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Location:
Brisbane
Registered:
May 2002
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Re: help back firing on boost
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Mon, 05 May 2003 07:44
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Sounds like you might be hitting boost cut. How much boost are you running?
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Location:
berala sydney
Registered:
November 2002
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Re: help back firing on boost
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Mon, 05 May 2003 07:57
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running about 10 psi but it would rev hard be for no probs till this f////en nutter got hold of it
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Location:
Brisbane
Registered:
May 2002
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Re: help back firing on boost
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Mon, 05 May 2003 11:33
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Well if a mechanic screwed up your engine I suggest you take it back and demand he fix it for you.
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Location:
sydney
Registered:
March 2003
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Re: help back firing on boost
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Mon, 05 May 2003 11:46
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wehat u mean by 2nd turbo
they both boost up together at same time
check for air leaks
or maybe even bad spark plugs
check that he hasnt swapped em for shitty ones its been doen b4
if its electrical i can possibly look at it for u
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Location:
Canberra
Registered:
May 2002
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Re: help back firing on boost
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Mon, 05 May 2003 12:46
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check your spark plug condition, & gaps. you may need to close them down to 0.8-0.9mm, but I wouldnt really expect that you'd need to with only 10psi
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Location:
MACKAY
Registered:
May 2002
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Re: help back firing on boost
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Mon, 05 May 2003 13:03
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Backfiring when boost comes on can be caused by leaning out , check your fuel filter and pressure .
Trevor
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Location:
Sydney
Registered:
May 2002
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Re: help back firing on boost
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Mon, 05 May 2003 14:07
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yeah if he was playing with the cold start(stepper motor) he may have knocked the vacum line to the fuel reg. also check that once the car is warm the stepper motor is closing off.
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Location:
berala sydney
Registered:
November 2002
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Re: help back firing on boost
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Mon, 05 May 2003 22:28
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hi all
Thanks for all the replys.Dont no what the prob is at the moment but will tell you all when i find it.I think the bugman is onto the prob will check it out.
Thanks again cya knackers
ps is the stepper motor on top front of the plenum chamber
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Location:
Sydney
Registered:
May 2002
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Re: help back firing on boost
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Tue, 06 May 2003 04:32
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also check all the leads are secured to the spark plugs.
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Location:
berala sydney
Registered:
November 2002
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Re: help back firing on boost
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Tue, 06 May 2003 09:28
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hia all
Well iam a bit :blush:embaressed for baging my machanic(sorry)
The problem turn out to be a lose wirer (the main wiring loom from the coil)one wire caused all the trouble  . well its going great now.Well thanks again boys for your advice & suggestions.
cya knackers 
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