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Location:
Brisbane (AUS)
Registered:
August 2003
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GZ power drop at 5500rpm
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Tue, 11 January 2005 06:47
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Hey guys i am tryin to find wats wrong with my gz when i put my foot down the car will rev up to 5500rpm and then just die in the ass like there is no power at all. Just wondering if anyone has come across this and what i can do to fix it. Its a 4agze Map sensored 1991-2 i think from a AE92.
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Location:
Sydney
Registered:
December 2004
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Re: GZ power drop at 5500rpm
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Tue, 11 January 2005 07:19
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its running too hot
do a search i've posted a dyno
timing retarding and fuel leaning
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Location:
Brisbane (AUS)
Registered:
August 2003
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Re: GZ power drop at 5500rpm
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Tue, 11 January 2005 07:27
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It isnt running hot becasue the temp gauge was no were near hot plus it has a 2 core raditor in it that is better then stock so i dont think it is a temp problem
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: GZ power drop at 5500rpm
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Tue, 11 January 2005 08:35
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could well be belt slip on the supercharger belt do u have a boost guage? how bad does the power drop?
The belt will slip at high rpm with a boost guage u can see the boost going backwards but u cant hear it if you have an exhaust like mine.
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Location:
Sydney
Registered:
December 2004
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Re: GZ power drop at 5500rpm
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Tue, 11 January 2005 08:47
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get it dynoed to be sure its not leaning out
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Location:
Ireland
Registered:
May 2002
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Re: GZ power drop at 5500rpm
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Tue, 11 January 2005 09:06
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Ive seen exactly that problem on my friends gze corolla.
We had the car at 5500rpm in fifth by the time the problem manifested itself.
There could be truth in saying the car is too hot.
This has been discussed on club4ag also, do combined searching.
Corolla had relocated cone intake, 175mm pulley, 13.5psi verified on a good HKS gauge, Front Mounts Intercooler.
Exhaust manifold was prone to glowing after such sprints!
HTH
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Registered:
August 2004
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Re: GZ power drop at 5500rpm
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Tue, 11 January 2005 11:10
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| mikey93 wrote on Tue, 11 January 2005 19:47 |
get it dynoed to be sure its not leaning out
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I have this same problem, turns out that its leaning out really badly and just dies high in the rev's.
Try a bigger fuel pump if you are still running a n/a fuel pump,
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Location:
Sydney
Registered:
December 2004
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Registered:
August 2004
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Re: GZ power drop at 5500rpm
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Tue, 11 January 2005 13:03
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My standard GE pump sure cant supply enough fuel to support the 1.2 bar that i get sometimes 
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Location:
Brisbane (AUS)
Registered:
August 2003
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 01:24
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It is running a 7mgte fuel pump which should be heaps for a stock 4agze it also wouldnt rev out past 5500rpm like it would rev to it and die down the rev to it and die down really quickly like you are hitting the rev limiter.
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Location:
Brisbane (AUS)
Registered:
August 2003
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 01:26
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I am also looking at gettin the greedy e manage ecu do you think this is a good replacement for the stock gx ecu
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Location:
sydney
Registered:
July 2003
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Location:
Sydney
Registered:
December 2004
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 06:00
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looks like we got the slow generation 4AGZE's lol.
my mates old ae101 stock made 96kw at the rear with microtech stock 8psi boost.
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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 06:20
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Dunno what you guys are doing wrong , my 4AGZE is fine right to redline in every gear.
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Location:
Sydney
Registered:
May 2004
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 06:32
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Do you have the bonnet scoop on it? That could ontribute to the problem if its heat related.
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Location:
Toronto, Downtown
Registered:
September 2004
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Location:
NSW
Registered:
September 2003
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 07:12
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Might sound obvious but... fuel filter!!!???
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Location:
Sydney
Registered:
December 2004
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 07:13
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possibly.. i haven't changed it yet still using the front cut one 
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Location:
Brisbane (AUS)
Registered:
August 2003
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 09:50
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Yeah i will soon see how mine goes on the dyno i am just gettin a 2.5" exhuast put on it so hopfully the prob will go away with that if not it is back to the drawing board
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Location:
Brisbane (AUS)
Registered:
August 2003
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 09:53
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it is brand new fuel filter and yeah it has a bonnet scoop but i dont think it is a heat problem becasue even with the bonnet off and just reving on the spot it wouldnt rev past 5500rpm
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Location:
Sydney
Registered:
December 2004
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Re: GZ power drop at 5500rpm
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Wed, 12 January 2005 10:41
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from what i noticed.. it leans out top end
timing retards, so does the the TPS. it starts to fall from 100% down to 70% or so as the revs rise.
There is a fuel cut of some sort. Or running limp
Do the diagnostics code check and see what it spits out
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I Supported Toymods
Location:
perth
Registered:
September 2002
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 03:45
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try replacing the fuel filter its a cheap thing to replace
then check the diagnostic for error codes from the ecu. it may well be a faulty knock sensor or falty signal from the oxygen sensor
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Location:
Syndey
Registered:
December 2002
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 04:04
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this has been covered in great lengths on the twincam.org forums, it is to do with the knock sensor pulling all the timing out, every GZE i have had on the dyno with the stock ecu does it, every microtech one i have tuned dosent do it,
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 04:16
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so you are saying that with microtech, you can allow knock to happen so you make power higher up?
or that the stock ECU is too sensitive to knock detection.. does the MT use the same algorithms to determine if knock is occurring?
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Location:
Syndey
Registered:
December 2002
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 04:24
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to stock ecu is too sensitive to knock and air temps as soon as the air temp goes up it retards timing, as soon as it hears any noise on the knock sensor it retards timing most of the time it is just normal engine noise,
MT dont monitor knock, its all up to the tuner to take care of that
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 04:53
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agreed does that on mine
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Registered:
August 2004
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I Supported Toymods
Location:
perth
Registered:
September 2002
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 05:44
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Ive just searched twincam.org for "power loss" "power drop" got nothing? Do you know the thread name?
This problem must be rectifiable (is that a word?) because wagonboy runs stock ecu and his works beautifully.
Can u just rip out or trick the knock sensor? Where is it located?
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Location:
Syndey
Registered:
December 2002
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 05:50
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i cant remember the thread name, it wasnt that long ago,
it dosent happen to all GZE's thats the tricky bit,
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 06:11
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if you rip the knock sensor out you will get an annoying check engine light and the ecu will spit out error code 52.
before trying anything i reccomend you start by shorting the terminals in the diagnostic plug to see if it spits out an error code and go from there...
it will take you all of 5mins to do aswell
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Registered:
August 2004
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Re: GZ power drop at 5500rpm
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Wed, 22 June 2005 07:43
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If your not sure how to do diagnostic Daniel i can show , its easy enough, needa come round so you can look at this relay setup anyway. . .
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I Supported Toymods
Location:
perth
Registered:
September 2002
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Re: GZ power drop at 5500rpm
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Mon, 18 July 2005 14:08
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Hey All
I found the post about this power drop problem on twincam.org with title : "Attn all MAP 4agze"
With the added research they have done i think its fair to say
The problem has NOT been solved by
-higher fuel octane
-changing superchargers, belts
-putting resistors on intake temp sensor (making ecu think 20 degrees celcius)
The problem HAS been solved by
-aftermarket ECU
-replacingt knock sensor. There is a dude in brisbane who ordered a genuine replacement knock sensor and it fixed his problem immediately and gave 20kw / wheels alledgedly 
Just wanted to let others in the same situation know.
Anyone know how to go about sourcing a genuine 4agze knock sensor from here?
Anyone got the part number?
Cheers
-daniel-
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: GZ power drop at 5500rpm
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Mon, 18 July 2005 21:40
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i know castle hill toyota can order it for you and post it aswell seeing as they arent that big i cant see it costing much try emailing jame sloane he is very helpfull and responds quickly to emails i will pm you his address
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I Supported Toymods
Location:
perth
Registered:
September 2002
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Re: GZ power drop at 5500rpm
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Sat, 29 October 2005 18:43
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--- 7mgte knock sensor update ---
Just reviving this age old post to let everyone know that this definately works. I barely ever get power cut at 5500rpm since doing this (think 7mgte knock sensor is less sensitive) and on the odd time I do, couple of quick revs to redline in neutral solve it for the rest of the drive.
--- notes ---
When pulling out factory ze knock sensor i could pull it apart with my bare hands and look at the internals. Looks like they may perish during transit or perhaps when sprayed down at the docks?
All thats necessary to get 7mgte knock sensor working is take its plug aswell, or simply butcher the existing ze plug. Cutting the outer plastic sheeth off the existing plug allows the centre part of the plug to perfectly schnick inside the 7mgte knock sensor.
All this done on ae101 ze
I didn't realize these engines were so good in stock form when you can freely rev to limiter 1st and 2nd gear...fucking FAST
-daniel-
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: GZ power drop at 5500rpm
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Sun, 30 October 2005 02:10
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| bayka wrote on Sun, 30 October 2005 05:43 |
All this done on ae101 ze
I didn't realize these engines were so good in stock form when you can freely rev to limiter 1st and 2nd gear...fucking FAST
-daniel-
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welcome to the dark side 
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