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Location:
Brisbane, Australia
Registered:
May 2004
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4AGZE running incredibly rich
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Sat, 08 January 2005 08:58
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I've currently got an AE101 4AGZE under the hood, fed by a VL commodore fuel pump with a stock fuel pressure regulator. I had the thing dynoed this morning. Basically its running 10:1 AFR. The guy who was dynoing it suggested a malpassi fuel pressure regulator.
I've searched around the forum and I've read some bad things about temperature affecting fuel pressure on the malpassi. What would you guys recommend?
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Location:
Newcastle
Registered:
May 2002
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Re: 4AGZE running incredibly rich
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Sat, 08 January 2005 10:09
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use a sard fuel pressure regulator.
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Location:
Brisbane, Australia
Registered:
May 2004
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Re: 4AGZE running incredibly rich
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Sat, 08 January 2005 10:22
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Thanks for that info. Are they widely availble in australia?
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Location:
Canberra
Registered:
May 2002
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Re: 4AGZE running incredibly rich
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Sat, 08 January 2005 11:19
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What reason did the dyno operator give for needing an aftermarket adjustable reg? Have you actually tested that your rail pressure is too high, and if so, have you eliminated any other problems that could contribute, such as a partially blocked return line etc?? There are several possible causes for your rich mixture, I wouldn't go and spend hundreds of dollars on a regulator unless you are SURE that it is the problem.
Maybe you've already done all this, in which case, ignore all I said  
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Location:
Brisbane, Australia
Registered:
May 2004
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Re: 4AGZE running incredibly rich
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Sat, 08 January 2005 23:22
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He seemed pretty certain about it.
The AFR graph starts out ok @ around 12.5:1, then as the rpm climbs it suddenly plummets down to 10:1 and stays there until redline. I have a feeling that this is when the 5th injector opens up.
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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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Re: 4AGZE running incredibly rich
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Sun, 09 January 2005 00:18
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That fifth injector is a cold start injector.
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Location:
Sydney
Registered:
December 2004
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Re: 4AGZE running incredibly rich
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Sun, 09 January 2005 00:32
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| Phoenix01 wrote on Sun, 09 January 2005 10:22 |
He seemed pretty certain about it.
The AFR graph starts out ok @ around 12.5:1, then as the rpm climbs it suddenly plummets down to 10:1 and stays there until redline. I have a feeling that this is when the 5th injector opens up.
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10:1 isnt too bad.. are you planning on modding it? your lucky to have more fuel then lean out at top 
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Location:
Brisbane, Australia
Registered:
May 2004
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Re: 4AGZE running incredibly rich
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Sun, 09 January 2005 01:01
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| DiZ_ wrote on Sun, 09 January 2005 10:18 |
That fifth injector is a cold start injector.
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Well, I'm an idiot. 
| mikey93 wrote on Sun, 09 January 2005 10:32 |
10:1 isnt too bad.. are you planning on modding it? your lucky to have more fuel then lean out at top
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Yeah it certainly is better than leaning out... but the engine isn't making anywhere near the power it should. It climbs fairly quickly to 75kw atw, then drops of momentairly (this is when it starts to go stupidly rich), and then climbs back up to around 75-80kw atw and hangs around there until redline.
Fixing this problem should give me another 15-20kw atw going by what everyone else gets on their stock GZE's.
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: 4AGZE running incredibly rich
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Mon, 10 January 2005 09:09
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a faulty 02 sensor can cause them to run rich, just another option to look at.
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Location:
Sydney
Registered:
December 2004
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Re: 4AGZE running incredibly rich
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Mon, 10 January 2005 09:40
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| Phoenix01 wrote on Sun, 09 January 2005 12:01 |
Yeah it certainly is better than leaning out... but the engine isn't making anywhere near the power it should. It climbs fairly quickly to 75kw atw, then drops of momentairly (this is when it starts to go stupidly rich), and then climbs back up to around 75-80kw atw and hangs around there until redline.
Fixing this problem should give me another 15-20kw atw going by what everyone else gets on their stock GZE's.
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Yeah too much fuel does cause power loss.
I made 92@fwkw 4th gear on BP Ultimate. But heatsoak cuased retardation
new i/c should help if not. ill install a FPR like you have mentioned.
is it an 92 or ae101 with 4 wire 02?
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4AGZE running incredibly rich
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Mon, 10 January 2005 12:26
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4agze ecu's only take O2 sensor into account on low throttle cruising, like higways and constant speed etc - the ECU runs open circuit when at WOT.
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Location:
Melbourne
Registered:
December 2004
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Re: 4AGZE running incredibly rich
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Mon, 10 January 2005 12:45
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does anyone know what kw is 4AGZE engines off a AW11, AE92 and AE101 rated ?
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Location:
Ireland
Registered:
May 2002
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Re: 4AGZE running incredibly rich
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Mon, 10 January 2005 15:39
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club4ag.com members and mr2oc.com members frequently talk about 5500rpm power dropoff in MAP gzes. 5500rpm engine hiccups, then runs insanely rich killing power.
Might be related?
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Location:
Brisbane, Australia
Registered:
May 2004
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Location:
Brisbane
Registered:
February 2003
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 02:32
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I ran a VL fuel pump and stock regulator on my GZE and continue to use it on my GTE. The richest it gets to is 11:1 on full boost, not that bad. I'd be looking elsewhere first.
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Location:
Brisbane, Australia
Registered:
May 2004
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 02:39
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Yeah, but what was it doing in stock form (before the turbo).
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 09:06
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i cant remeber getting any sort of fuel economy from my gze but mybee thats cause ive allways got my foot burried 
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Location:
Brisbane, Australia
Registered:
May 2004
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 09:35
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Well you know whats funny?
While running stupidly rich, I'm getting 7L/100km. 
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 09:39
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i probably do get decent fuel economy but with a 35ltr tank it seems to go kinda quick
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Location:
sydney
Registered:
March 2003
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 11:55
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before u go testing everything this could be a normal thing
some car manufactures use something called wide open throttle
i have had a good air fuel meter on my hilux and mixtures are perfect except
when under about 90% throttle all is perfect
over 90% then i think the ecu is programmed to dump fuel in so as not to blow up the engine
this i swhy alot of engines get more horsepower when u fit an aftermarket ecu and lean it off up hi
i can be on and revs and load mixtires are perfect but
as soon as i get over 90% its goes to 10 : 1 air fuel instanlty
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Registered:
August 2004
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 13:09
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Ive heard the Toyota ECU's are one of the worst for over fueling.
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: 4AGZE running incredibly rich
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Tue, 11 January 2005 13:20
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nissans are prettey bad too
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Location:
Ireland
Registered:
May 2002
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Re: 4AGZE running incredibly rich
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Wed, 12 January 2005 09:54
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several club4ag and mr2oc members speak of hitting 10:1 AFR at 5500rpm.
Does an S-AFC override the ECUs wide open throttle settings?
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Registered:
August 2004
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Re: 4AGZE running incredibly rich
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Wed, 12 January 2005 15:17
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Yes they have high and low throttle setting, i know of some ppl that their AFC is taking 25% fuel put
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Location:
Sydney
Registered:
December 2004
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Re: 4AGZE running incredibly rich
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Thu, 13 January 2005 13:09
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have you tried running a hotter plug?
just a thought? maybe in the 5/6 series
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