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Location:
Toowoomba
Registered:
May 2002
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1g-gte (gen 3) idle problem
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Fri, 17 December 2004 09:32
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Hi everyone.
I have a problem with the idle speed in my 1g-gte. It increases to maybe 1500 rpm then it's almost like it cuts out (like lifting your foot off the throttle), this hits I suppose about 800-900 rpm and instantly increases again. If I unplug the idle control unit it revs at about 2000rpm but it's stable. Any ideas on where I should start to look? I'm pretty sure it's electrical but I don't know which sensor to look at first. The last time the motor was run (around 5 months ago since I have been building the rest of the car) it ran smooth as a button so I think I may have made a mistake in the wiring when I did the conversion.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Fri, 17 December 2004 11:02
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Clean the ISCV properly, thats where I'd be looking first, and if it's anything like mine was, it's full of gunk.
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Location:
Malaysia,Kuala Lumpur
Registered:
July 2002
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Re: 1g-gte (gen 3) idle problem
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Fri, 17 December 2004 11:33
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i have the same prob..where's the ISCV ? what does it look like ?
Cheers
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Location:
Melbourne
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Fri, 17 December 2004 12:21
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The iscv is the black little unit located on the plenum next to the throttle body towards the front of the car.
Cheers Adam
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Location:
Malaysia,Kuala Lumpur
Registered:
July 2002
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Re: 1g-gte (gen 3) idle problem
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Fri, 17 December 2004 12:30
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is that the one with the pipe attached to it ?
Will look and see if it's the right one. How do i clean it ?
Can i use a carb cleaner ?
cheers
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 00:10
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I had that problem too. Turned out being lack of power to the stepper motor... Cleaning will help too 
Since it's a weekend, i'm going to be doing a lot of cleaning 
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Location:
Melbourne
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 00:23
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Out of curiosity how did you increase the power to the steper motor.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 00:27
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Sorry, I should clarify, there was NO power getting to the stepper motor, I missed one wire during the conversion 
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Location:
Toowoomba
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 03:58
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worked a treat. thanks guys. one more thing. it seems to idle a little high, I have checked the accelerator tension and the stepper motor adjustment, where else effects idle?
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 04:01
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Idle screw on top of the throttle body.
I cleaned my ISCV today just to see what'd happen, it idles way more smoothly now. I also cleaned out that one way valve that sits in the hole.
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Location:
Toowoomba
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 08:35
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We'll it turns out the reason for the idle being high is because when I cleaned out the iscv the plunger (magnetic thing inside) was all the way out and there was no power to the iscv to push it back in . I connected it to some power and problem solvered.
Does anyone know which wire to use to turn on the electric fan or does the ig-gte ECU not have accomodation for that?
Also where is the easiest places to get to to rig up a boost gauge and oil pressure gauge?
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 12:11
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The electric fan on my car is controlled by the A/C circuit... I assume the 1g-gte ecu doesnt deal with this since it has the fan on the water pump pulley.
Boost gauge can come off the intake plenum... at the end that has hoses going to things like power steering (you probably dont use this) and the like.
Oil pressure... umm... there is a sender on the engine, but I dunno if it'll work with anything but a factory toyota gauge. It's on the intake side of the block... maybe adapt this to work with a new gauge?
As I said above, I had that problem with my ISCV Missing power!
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Location:
Toowoomba
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 14:10
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thanks for the tips. I should be able to use a 'T' piece on the original oil sender it's just nice to know the general area it is in so I don't have to go looking for it  . The 1/2 cut had a small electric fan aswell as the water pump fan on it, this was triggered when the car reached temperature. It might have just been triggered by an external switch. Maybe I should have paid more attention before I pulled it apart  . How have you used the A/C circut to control the fans?
On a different note. Can anyone recommend some decent but not too expensive gauges? I've decided it would be easiest to just replace everything (mainly so it all matches). I'm not after pretty blue lights or anything like that. Just want a reliable and not too ugly set of standard gauges (fuel, oil, water, volts, speedo, tacho and maybe boost for when I play with that). They will be going into a panel similar to a standard RA28 cluster (fiberglass copy with some modifications).
BTW this thing is fast. Took it for a short run up the street and it's a lot of fun. Can't wait to have it all registered and on the road.
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Location:
Sydney
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 22:32
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after cleaning it and having my one stick a few too many times, I just cut out a blanking plate from some 4mm gasket. put it in there and no more dramas from it. only down side it that it doesnt idle up to warm up, but really that isnt a major problem. atleast I know it is sealed.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 22:46
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Mine never does the cold idle up  I haven't been able to work out why yet.
I haven't used that small electric fan... I think it's for when the car is sitting in traffic with the A/C on. I dunno, i'm only guessing.
Yeh a gen3 1g-gte should be pretty zippy! My 1g-gte is a gen 3 but someone replaced the turbos with gen1 items... and they suck.
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Location:
Sydney
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 23:55
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the reason your idle up will not be working is most likely it is gunked up. my one was gunked up and the little one way flap inside it was stuck closed.
pull apart and used wd40/degreaser to clean.
it doesnt need the electric connected as it runs off the water too.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sat, 18 December 2004 23:59
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Interesting...
That flap, I cleaned it up, but I still don't see any idle up happening. Thats the orange flap right?
Maybe I should pull the ISCV off and clean it more.
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Location:
Sydney
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sun, 19 December 2004 01:21
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yeah orangy pink. that makes sure once on boost nothing comes back from the inletmanifold into the plumbing.
the valve needs to be cleaned and also try pushing it in and out to free it up.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sun, 19 December 2004 02:03
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Ok, I assume you mean the ISCV itself and not the orange flap then? I'll push it around a bit until I think it's clean
If the cold start injector wasnt working would the cold idle up not work correctly? I suspect that it might possibly be blocked up... maybe I should try remove it and check it.
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Location:
Canberra
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sun, 19 December 2004 10:49
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Well, what a spin out, i just came on here to post a similar question about the crazy idle on my 1GGTE. Its been idling up to 1500 and then stays there for sometimes AGES! Sometimes till i stop for a while then restart it. Other times its fine around 900.
But ive figured out if its idling normally and I let the clutch out slow, give it no gas and let the idle pull the car. The idle jumps up 1500?
Whats with that?!
I changed the ISCV but maybe this one's just as bad? Where does the power come from and even if it had no power, it wouldnt ever slow the idle down, would it?
IS it the only thing that controls the idle?
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sun, 19 December 2004 11:30
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Sounds more like a vacuum leak or AFM problem.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sun, 19 December 2004 13:34
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My ISCV is acting funny or something
It worked once today, was great! But it never worked again after that... I'm starting to think the motor is stuffed, and it only steps in one direction. Or maybe the power is only acting in one direction, or some other crazy shit.
I wish I had a lot of them sitting around
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Location:
Sydney
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Sun, 19 December 2004 21:27
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just do what i did and blank it off.
it then eliminates it as the problem, the car still starts in the cold, just doesnt idle up to 1500rpm to warm up so you can either let it warm itself up on a low idle or just give it some accelerator to warm up. but you wont have any dramas from the iscv anymore.
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Location:
south east - melbourne
Registered:
March 2004
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Re: 1g-gte (gen 3) idle problem
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Sun, 19 December 2004 22:16
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anyone got a pic of this thing (iscv) and how to clean it , is it just open the black box and spray wd40 in it , or will shit pop out of it when opened like springs or metal bits or what not , dont want to open it up and have shit flying everywhere
cheers
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Location:
Malaysia,Kuala Lumpur
Registered:
July 2002
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Re: 1g-gte (gen 3) idle problem
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Mon, 20 December 2004 18:30
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Yup...i second indian's question ...will shit come flying out
I.e. bb's or spring etc..
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Location:
Sydney
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Mon, 20 December 2004 23:49
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no you undo the two size 12 bolts holding it in.
the only things you can loose is the flap thing and a rubber ring that hold it in and seals everything but they are both semi inside the inletmanifold.
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Location:
south east - melbourne
Registered:
March 2004
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Re: 1g-gte (gen 3) idle problem
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Tue, 21 December 2004 00:12
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SO what exactly do we have to clean , is it only the little bit where the black box comes out of or the actual stuff inside the black box itself 
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Location:
Canberra
Registered:
May 2002
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Re: 1g-gte (gen 3) idle problem
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Tue, 21 December 2004 03:56
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Just out of curiosity what do your guys 1GGTEs idle at under cold start? Mine has always idled at 2000rpm! Sounds a bit excessive if you ask me but i never thought to ask...
1500 rpm as stated above?
What could be making it idle this high?
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Location:
south east - melbourne
Registered:
March 2004
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Re: 1g-gte (gen 3) idle problem
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Tue, 21 December 2004 21:31
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yeah 1500ish and then down to 700-600 rpm when normal temperature
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Location:
Malaysia,Kuala Lumpur
Registered:
July 2002
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Re: 1g-gte (gen 3) idle problem
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Mon, 27 December 2004 01:13
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Hello again..
after reading all about the ISCV i decided to 'clean' mine too over the weekend, TELL ME IF THIS SOUNDS RIGHT.12 size bolts..removed..all I saw was the O-ring..that rubber valve thingy covering the hole...removed and that was it. No flap..in the plenum..where there was kinda groove half 'curve' hollow' place where I think there might have been a flap/butterfly..
The black part itself..had a spring type valve...kinda one like in a thermostat..but it was hard..could not move it back in or forth. IS this Right ? Can someone please advise..or show me pics or diagrams ?
Thanks for the help
Cheers
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