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Need Help With Gas Power problem 

 

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 Post subject: Need Help With Gas Power problem
Posted: Sat Jan 16, 2010 10:25 pm 
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Location: Adelaide
SA, Australia

Hey
Ive recently purchased a au falcoon on gas.The previous owner said it need a tune cause it had no power.
so i went and got it tuned he said the tune was fine it made no difference really at all.It takes around 60 secs to get to 100. goes up semi steep hills at like 50-60 kph just has no real go at all.
So i need some ideas and opinions on what it could be it is so slow !
I think it could maybe be the converter gas guy didnt think it would be ???
Maybe timming ??
what else could it be
the car has new coil pack leads and plugs
Also onl got around 120 ks to 28l of gas
cheers
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 Post subject: Re: Need Help With Gas Power problem
Posted: Sat Jan 16, 2010 10:50 pm 
Getting Side Ways
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Location: melburn
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first step would be to check compression.
is it down on power on petrol also?
what gas system are you running?
how many ks on the driveline (including engine)?

tune plays a huge part on how gas perfoms, but you wont be able to play with the tune much without some form of ecu.
playing with the gas settings can still provide some form of drivability or economy increase at least...

 

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 Post subject: Re: Need Help With Gas Power problem
Posted: Sat Jan 16, 2010 11:09 pm 
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180 across all cylinders
Its factory straight gas
has a different converter on it not standard one
cars done 500 thousand 200 thousdand on engine and trans
i Dint think gas had ecu ?

its use huge amounts of gas but is so slow redicolously
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 Post subject: Re: Need Help With Gas Power problem
Posted: Sat Jan 16, 2010 11:14 pm 
Getting Side Ways
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factory straight gas will def have an ecu - well it has a different map.
but i was mainly getting at the fact that you cant change your spark mapping without an ecu upgrade.
but if its chewing through the gas then the gas system could use a tune up.
im not 100% sure how the factory gas stuff works, so maybe someone else can help with that, but its quite common for gas setups to have a simple ecu that uses for oxygen sensor (and few other sensors) to drive a stepper motor that will help meter the gas going into the mixer.

what brand and model converter is fitted?
sometimes changing converters can cause exactly what you are explaining as it might not suit your mixer.

 

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XG Panelvan
mild engine, EL ECU & J3, HI6 & MSD coil

in the shed - .595" lift cam, GT4202, forged AU engine, ems 4424 ecu, glide & 5500 stall - next-bellhousing

XH ute daily - DOHC BA XR6 engine, T5, AU3 ECU, J3 chip, wideband & logger, ported BBM, 3" intake

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 Post subject: Re: Need Help With Gas Power problem
Posted: Fri Feb 12, 2010 5:01 pm 
Oompa Loompa
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Ride: EBII Fairmont Ghia i6

Location: Normanville
SA, Australia

ke55pig wrote:
180 across all cylinders
Its factory straight gas
has a different converter on it not standard one
cars done 500 thousand 200 thousdand on engine and trans
i Dint think gas had ecu ?

its use huge amounts of gas but is so slow redicolously


even my EBII's LPG has an aftermarket ECU which runs off the engines sensors to help the tune. granted i only got the system put in a month ago. Unless ur ecu has fried and ur spark timing is WAYYY wrong. sound like the timing is retarded if it was an older car but since the compression is there its gotta be electrical. Unless ur cat converter is seriously blocked preventing the exhaust to come out and choking the motor. Is the auto trans in limp mode? this will make it feel like its taking off in 3rd
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 Post subject: Re: Need Help With Gas Power problem
Posted: Sun Feb 14, 2010 8:31 pm 
Getting Side Ways
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It could be timing related, does it ever back fire thru the intake or go "bang" thru the exhaust? Do you know if the o2 sensor is working properly? If not, you will be running mega rich. You sure the car doesn't have any vacume leaks? That too will cause poor economy.

What sort of spark plugs are in it & what gap are you running?

Cheers

TranaGuy

 

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