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gu power or lack off
Posted: Wed Oct 29, 2008 9:29 pm
by matty_d
hi all i have a drama my 4.5 gu has this on and off problem a little info it has unchip and full exhaust sys and duel fuel now just the other day driving down the road she had a miss fire and went away but then i went to go around a car it just died it ran out of power and could not rev up and could not even rev past 3000rpm i have been under the bonnet for the last two days going over eveything and all looks fine so i was thinking it is the dissy playing games??? can anyone else give me advice anything would be great thanks
Posted: Wed Oct 29, 2008 9:36 pm
by PGS 4WD
If you have the Unichip bypass link try fitting it to eliminate that as the fault.
Joel
Posted: Wed Oct 29, 2008 9:43 pm
by matty_d
no bypass link do you think the guy who fitted will have one??? oh i forgot to say this problem comes and gos it fine for a few days then its back again got me stuffed i am worried it is the unichip
Posted: Thu Oct 30, 2008 5:33 pm
by matto
i had a falcon that did that and it was the ignition leads
Posted: Thu Oct 30, 2008 9:14 pm
by PGS 4WD
He should have. It could certainly be ignition, if worse on a snap throttle and high load that might point to a leads breaking down or jumping to ground. Also make sure the top hose is not rubbing against the leads. Check all the obvious stuff if you haven't. Cap, rotor, plugs, leads. Also the intake manifolds can get air leaks at the joints.
Joel
Re: gu power or lack off
Posted: Fri Oct 31, 2008 7:19 am
by jessie928
matty_d wrote:hi all i have a drama my 4.5 gu has this on and off problem a little info it has unchip and full exhaust sys and duel fuel now just the other day driving down the road she had a miss fire and went away but then i went to go around a car it just died it ran out of power and could not rev up and could not even rev past 3000rpm i have been under the bonnet for the last two days going over eveything and all looks fine so i was thinking it is the dissy playing games??? can anyone else give me advice anything would be great thanks
hi man
If it backfired, It may have blown the " SEAL" that is the failsafe to protect the airbox/mixer during backfires.. check the intake hose from the airbox to the intake manifold, you may find something like wesuit material, or a bit of gaffa tape thats blown up.
you could have also blown the airflow sensor or covered it in crap from the backfire.
Jes
Posted: Fri Oct 31, 2008 3:57 pm
by matty_d
no back fire and would n t the air flow meter not be in action when on gas
Posted: Fri Oct 31, 2008 7:37 pm
by jessie928
matty_d wrote:no back fire and would n t the air flow meter not be in action when on gas
sorry i misread missfire as backfire
does it run ok on petrol?
Jes
Posted: Fri Oct 31, 2008 9:42 pm
by matty_d
nar runs like crap on both leads or spark that what it feels like but its got new leads plugs rotor and cap
Posted: Fri Oct 31, 2008 10:01 pm
by matty_d
is there anyway of bringing up fault codes there no info that i know of to do so i dont wanna take it to a dealer
Posted: Sun Nov 02, 2008 11:27 am
by nabstud
My old 4.5 GU did something sort of like that, it also had a flat spot. Turns out it was the fuel filter that caused it. Changed the filter and all was good.
Posted: Sun Nov 02, 2008 10:45 pm
by matty_d
not fuel filter its new and does it on gas as well i took of the i think its egr valve it was coated in oil cleaned and seam sto be better well hasnt played up yet so i keep driven it till it does
Posted: Sun Nov 02, 2008 11:02 pm
by j-top paj
nabstud wrote:My old 4.5 GU did something sort of like that, it also had a flat spot. Turns out it was the fuel filter that caused it. Changed the filter and all was good.
mine has something similar at 3100rpm. the power seems to "kick in" noticably above that.
is this similar to your old one?
Posted: Mon Nov 03, 2008 5:58 pm
by nabstud
j-top paj wrote:nabstud wrote:My old 4.5 GU did something sort of like that, it also had a flat spot. Turns out it was the fuel filter that caused it. Changed the filter and all was good.
mine has something similar at 3100rpm. the power seems to "kick in" noticably above that.
is this similar to your old one?
Not really on petrol, but thats what it did on gas. Above about 2500rpm and it felt like it had an extra 30kW kicking in...
Posted: Mon Nov 03, 2008 7:22 pm
by j-top paj
how did you fix it?
mine did it when i first got it but then stopped doing it for a while and now its back again
Posted: Mon Nov 03, 2008 9:50 pm
by nabstud
Didn't get a chance to fix it, it got written off before I investigated it
