2JZ-GTE engine hunting at idle - conversion into falcon

[Shakotan_Aaron]

you need to ADD power to E3. i dont know what you have done exactly, but you will need to take power from somewhere to power up this wire.

[wrench]

So the ISCV just needs straight up 12V?
Yeah its weird actually, it took 2 days for me to get the loom out of the aristo coz i refused to cut wires. I cut the 1/2 cut away from the loom as it were lol. Only disconnected the plugs that go through the firewall for the ecu and body plugs, but all that stuff is plugged back in. I'm a 240V electrician by trade, thats why i won't cut wires if i don't have to lol.

[Shakotan_Aaron]

cutting wires is fine, as long as you dont need them.

as your not using hardly anything these a heap of shit in the looms that you wouldn't need anyway.

+12v for ISCV and VSVs etc should be connected via the E3 pin via the main relay which comes on when the ignition is turned to 'ON'. with mine i couldnt find a male plug for the engine>body loom (didnt come with the engine and i didnt buy a half cut) so i had to use spade terminals. but you shouldn't have that issue.

[wrench]

Powered it up, made no difference. Ran fuel pump at 6v made no difference. I took the idle control valve out of the equation by disconnecting it, blocking vacuum lines etc... It stopped hunting but it is pumping out the fuel smoke at idle, i can't rev it out either, i'd say its running way too rich, this was also with fuel pump running at 6V.
I'm also using a aftermarket O2 sensor, would this be a reason its running rich?

[wrench]

I checked, there is power at the ICV plug. I took the ICV out and it was open, i could blow through it easily. Seeing how i unplugged it while the car was running and it made no difference would that indicate that it is stuffed? And causing the hunting?

[wrench]

I have blocked off the ICV, unplugged it and adjusted up the throttle stopper screw, it will now idle, just running rich as hell. Any ideas on how to make run a bit leaner? When i try to rev it splutters and carries on.

[midnight_purple_GA70]

have you checked the map sensor and vac lines to the map sensor...

also if the o2 sensor is the wrong type it might cause it to have issues...
what was wrong with the standard o2 sensor?

[wrench]

The standard one got broken pulling the engine out of the halfcut. I'm using a single wire one off my old MZ10 soarer now, it looks similar to a 4AFE one. Yeah i haven't touched the TPS or MAP sensor yet. Its just dumping the fuel into it at present. So is it ok to get rid of the ICV ? Is there anyway to get it to run a bit leaner?
The 02 sensor up near the twins is still there, i broke the one that was down past the cat ( the cat is long gone too ).

[midnight_purple_GA70]

if the one near the twins is ok then that shouldnt be an issue...

personally since it is all stock running of a stock ecu etc i would be trying to ensure the ICV works correctly then once it is working correctly close the throttle plate back up and adjust the tps (im sure there is a proceedure around here somewhere for doing it)

possibly check your fuel pressure and make sure its not above stock (think its 38psi)

and when you say it hunts how bad or extreme are we talking?

[wrench]

The hunting has stopped now that i have disconnected the icv. I tried to grease it up and clean it up but it still won't work. I checked the power to it, both centre pins have power so thats fine there. I have a rising rate regulator, i may connect it up but not put the vacuum on so it doesn't raise the pressure. I have a VL turbo external fuel pump on the car, fed from a 10L fuel cell. Will check pressure tomorrow. Yeah the o2 sensor near the twins never even got unplugged. There is only the 1 fuel pressure regulator on the 2j? Up on the fuel rail near the front of the engine? I replaced all the vacuum lines for map and sensor and fuel reg.
What do you mean by close the throttle plate back up ?
It was hunting 1000-2500rpm and back again.

[midnight_purple_GA70]

that to me sounds more like a malfunctioning ICV rather than hunting...

the ones ive seen hunt dont generally hunt more than a few hundred rpm...

what i mean by close the throttle plate was refering to you mentioning earlier that you had to crack the throttle to get it to idle... i assumed you mean you adjusted the stopper to manually force it to stay open? or do u mean you just had your foot on the gas?

stock fuel reg is on the stock fuel rail to the front of it... just get a pressure gauge on the feed line and check what its doing... if your fuel pressure is good at 38psi at idle its probably a good sign

afaik you dont need to grease the ICV just clean all the carbon off it with carby cleaner and put it back together...

[wrench]

Yeah i have blocked the ICV now, it has stopped doing it. I pulled it right apart to clean and grease the bearings inside it. Made no difference, i think it has been dead for a while. Yet to check fuel pressure.

[wilbo666]

I've only quickly read this, but are you sure you have used a relay that is triggered by the engine ecu m-rel pin to power the iscv?
Sounds like that might be the issue...?

This link on my wiki maybe useful
http://wilbo666.pbworks.com/M-REL+-+...ISCV%29+Wiring

Also this link for general jzs147 wiring
http://wilbo666.pbworks.com/2JZ-GTE+...+Engine+Wiring

Cheers
Wilbo

[wrench]

Yeah the wiring is fine, there is power at both centre pins of the ICS's plug. Coz of the way i removed the loom from the halfcut no wires were cut and only 4 plugs were unplugged. I took every last wires out of that half cut and it is still all sitting in the falcon. I tested the ICV both on the car and with a battery pack and it wouldn't budge, i think its stuffed. I'm not worried about it now anyway as the car has stopped hunting now. Just got to sort out over fueling issues.

[JP]

unplug the vac line for the map sensor while it's running and see if that makes any difference. If the map sensor is broken/not working then they run extremely rich at idle and have trouble free-revving.

If unplugging the vac line makes no difference, get a multimeter and check the sensor output voltage, the table from Wilbo below lists the sort of level's you should be reading:


With the engine off and ignition on you should have about 2.6V, at idle it should be lower around 1.7ish.

If you have 2.6V or higher at idle it will pour fuel out the exhaust.