3d gen 3sge problems Options

[mi645]

ok having big issues with 3d gen 3sge
st204 swap. so turn on engine poor idle, idle jumps around 750-900 car wont rev smooth at sll anytime u rev it goes up then down to like 200 rpms ad back up to 750, seems like its running rich, new oem spark plugs and already black, was using oem parts that came with the engine so then trouble shooting i switched igniter off 5sfe switched tps sensor off my 5sfe the map sensor the distributor rotor, and same issue i need help!!!

[Rusty]

Any CEL codes? I'm sure something would be popping up.

If you've just done the swap, has it got fresh fuel in the tank.

During the install was there any maintenance done on the engine?

[mi645]

quarter tank 91 gas.
lof lube and oil filter.
cam seals crank seals
all belts incluing timing belt
spark plugs and wires distributor rotor not cap
water pump and thermostat
map sensor
coil igniter
tps sensor
all oem toyota parts except for gates timing belt

[Rusty]

Ok, and the CEL codes and the fuel age?

[mi645]

no cel codes atm even when i plug te1 and e1
fuel age less than 2 month,
yesterday performed compression test 150 all across battery a bit low dead now so it wasnt spinning at full speed.
also new plugs when took them off they were super black, meaning car is running extra rich.
conclusion for me is vac leak or coolant temp sensor i will perform some checks when im home .
but ideas rusty? vac diagram anywhwre?

[Rusty]

Yeah a few ideas, just trying to get more of an idea on what's happening, what's been replaced.

the idle sounds very off first idle should be ~1,800rpm and then after 5 mins or NOT should be a smooth 750 +/-50rpm


First things to check, that all sensor plugs are fully plugged in all the way. It's something simple, but sometimes overlooked.

Secondly vacuum lines:
MAP sensor: from the sensor itself, runs along the top acis chamber and plugs into the intake manifold just after the throttle body.
On the intake pipe:
Idle line/big hose, from the intake pipe to the ISCV which lives under the TB
Vacuum line/small, hose goes to a 'T' section hard line that goes to idle up and to the back of the engine, can't remember exactly where off the top of my head.


Sensors to check they are: clean & operate as they should
Idle Speed Control Valve (ISCV) - chances are this is dirty
Water temp sensor
TBPS - was replaced and was set right?

I wish I had a vacuum diagram of the gen 3, I have a gen 2 diagram

[mi645]

tps chaned and adjusted isc cleaned and adjusted.
coolant temp sensor just replaced same issue

[Rusty]

Interesting. As those parts are the most likely things to be causing the problems.

So you're happy with the engine wiring, no faults in the loom? All sensor connections are fully pushed all the way in? When parts were replaced, were they installed correctly & the right way? The ISCV, how was that cleaned, rebuilt and adjusted? From memory they were computer controlled and not really manually adjustable?

Any chance of some decent photos of the engine bay and possibility of a video of the idle + trying to rev?

[mi645]

all eiring was connevted correctly i just took it out to double check it all today, all sensirs r good to go i have bo ps belt so ps atm, also ac idle up valve not connected to the harness but connected to the vacuum, ill get a video when i can and isc cleaned with tb cleaner and replaced the gasket for the coolant and installed with fipg around and valve was stuck shut when cleaned it moves easily inside and yes its adjustable with the throttle body measure resistance when in idle abd when throttle about to open