| Author | Topic |
|---|
Location:
Melbourne
Registered:
August 2005
|
|
20V motor in a SX twim cam
|
Wed, 24 August 2005 12:30
|
 |
|
i recently bought a SX with a 20V motor in it, but something wrong wiht the idling...sometime it goes down to 500Rev but sometime will go back up to 1000 to 1200..anyone knopw what is the problem is? can anyone help me out?
|
|
|
Location:
sydney
Registered:
March 2003
|
|
Re: 20V motor in a SX twim cam
|
Wed, 24 August 2005 12:58
|
|
you could have an air leak
also could be prob with wiring
or tps
make sure theres power to idle motor
|
|
|
Location:
sydney
Registered:
October 2004
|
|
Re: 20V motor in a SX twim cam
|
Wed, 24 August 2005 13:54
|
|
i have this problem too
well i think i fixed it
happens every now and then
mayb ur AFM is screwed
cause mine was and when that got fixed
its made it abit better
mayb check ur leads also
|
|
|
Location:
Melbourne
Registered:
August 2005
|
|
Re: 20V motor in a SX twim cam
|
Wed, 24 August 2005 15:21
|
|
so how much u spend to fix it? do i need a dyno tune up?
|
|
|
Location:
Melbourne
Registered:
August 2005
|
|
Re: 20V motor in a SX twim cam
|
Wed, 24 August 2005 15:21
|
|
|
what is AFM by the way?
|
|
|
Location:
Toronto, Downtown
Registered:
September 2004
|
|
Re: 20V motor in a SX twim cam
|
Wed, 24 August 2005 22:57
|
|
afm is air flow meter...
which version of 20v is it black or silver top???
if its a black top then there is no AFM..
Its a fair chance the TPS (throtle position sensor)needs adjustment or you have a leak somewhere after the afm if there is one....
Hunting can also be an issue with coolant i belive if there is an air pocket in the cooling system.
|
|
|
Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
|
|
Re: 20V motor in a SX twim cam
|
Wed, 24 August 2005 23:12
|
|
with something like this, i would think it has more to do with the ISCV (idle speed control valve/motor)..... i had a similar issue with a 20V conversion i recently completed, whereby the engine would idle nicely when warming up - but once at operating temps the engine would run out of air from the idle being too low.
How the ISCV works is that when the engine is cold, it is fully open (or near fully open) allowing the engine to idle a little higher than normal.... and as the engine warms up the ECU (engine control unit - computer) starts to close up the ISCV to bring the idle down to the 800-900rpm it should be at.
With the conversion i just did (same thing - silvertop 20valve into AE92 SX seca), we tried cleaning out the ISCV in case it was getting "sticky" from oil residue etc... but it still seemed to be a bitch.
The solution was.... unplug the ISCV. Yes the engine will idle a little higher when warm... but at least it doesnt die!
|
|
|
Location:
Toronto, Downtown
Registered:
September 2004
|
|
|
Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
|
|
Re: 20V motor in a SX twim cam
|
Wed, 24 August 2005 23:39
|
|
yeah with this one, it would idle fine when cold and whilst warming up... but at full operating temp the engine was starved of air, and would eventually die out.
You could tell because you could hear the circuit opening relay clicking on/off since the AFM flap was fluttering open/closed.... (this is because the circuit opening relay is triggered by the AFM flap opening)
Unprug ISCV - no probrem!
|
|
|
Location:
Melbourne
Registered:
August 2005
|
|
Re: 20V motor in a SX twim cam
|
Thu, 25 August 2005 03:56
|
|
|
so..not sure..is like black in the middle and silvr both sides...where can i take it to fix in Melbourne? or to check it out?
|
|
|
Location:
Melbourne
Registered:
August 2005
|
|
Re: 20V motor in a SX twim cam
|
Thu, 25 August 2005 04:07
|
|
|
i had a quad throttle...so must be the air flow meter...i remember the guy who sold the car to me said it has some sensor missing in the throttle..
|
|
|
Location:
Toronto, Downtown
Registered:
September 2004
|
|
Re: 20V motor in a SX twim cam
|
Thu, 25 August 2005 04:24
|
|
|
not all quad throttle 20v's are air flow metered the black top 20v's are map sensored. The ISCV could well be the missing sensor as i think from memory of finneys 20v its near the quads
|
|
|
Location:
Sydney
Registered:
April 2003
|
|
Re: 20V motor in a SX twim cam
|
Thu, 25 August 2005 04:34
|
|
Where can you get an ISCV from? Mine has the same problem.
Just rang Toyota. They need to come in from Japan but the price is too scary to mention.
Anyone got one for sale?
|
|
|
I supported Toymods
Location:
NY
Registered:
May 2002
|
|
|
Location:
Melbourne
Registered:
August 2005
|
|
Re: 20V motor in a SX twim cam
|
Thu, 25 August 2005 04:52
|
|
|
i will go to hk next week to see if i can get all the parts i need there...so where can i take the car to check up?
|
|
|
I supported Toymods
Location:
NY
Registered:
May 2002
|
|
Re: 20V motor in a SX twim cam
|
Mon, 29 August 2005 10:00
|
|
|
i hear HK is good for rollas.
|
|
|
