1g-gte problems - need some help

[ndgcpr]

He mentioned in the soarer thread (which we will move all talks to here now) that he is running 2 AFMs and got codes 24, 31 and 34.

24 = Intake air thermo sensor signal
31 = Air flow meter signal
34 = Over Boost (Air to Water Intercooler)

First of all can you explain the 2 AFM bizzo?

the 1G's run a line from the AFM to the fuel pump. If the AFM see's no air flow then it shuts off the fuel line (from what i can remember). It means that if you stall the car the fuel pump shuts off or if you disconnect the AFM the fuel pump shuts off. (oops I didn't really read what brett wrote so this is pretty much what he said)

Also i always thought that an air leak ran it too lean and thus idled higher?????

I mentioned trying to clean the ISCV (not that it would make a diff) Anyone know how to do this if the screw heads are not well?

EDIT: SOrry i am stupid, i think he has 2 afms and tried both not 2 running at the same time. This still means that a wire could be broken between the AFM and ECU...

[Hydra]

the 1G's run a line from the AFM to the fuel pump. If the AFM see's no air flow then it shuts off the fuel line (from what i can remember). It means that if you stall the car the fuel pump shuts off or if you disconnect the AFM the fuel pump shuts off. (oops I didn't really read what brett wrote so this is pretty much what he said)

Sorta... there should be a fuel pump relay of sorts, and there is the (from memory) circuit open relay which when you turn off the car, will keep power supplied to some parts of the engine and car while things like the ISCV reset to the open position. It also is supposed to ensure the fuel pump shuts off correctly in a crash, preventing fuel.. fuelling a fire.

That 2 AFM business was odd before you edited

[VeeP]

this is getting to be frustrating.
iv checked cooler piping n all seems ok. Still cant find that fuel filter under the body or elsewhere. Its not running rich i dont think because its not blowing any black smoke at all and as well i have my modified AFM in at the moment (which runs leaner). toyota wants 240bux for a new fuel pressure regulator bahhh!

and whenever i open the fuel cap it makes a "psshh" sound so there is obviously air coming out of the fuel tank whenevre i open the cap accompanied by the smell of fuel. So. . . took out the charcoal canister and blew some compressed air through it but no fix. . . . whats up with that?

Btw now the motor is "spitting" what seems to be oil out of the exhaust at idle too. . . . .

[love ke70]

why do you think its oil?
is it black? probably fuel picking up the extra carbon in your exhaust.
either that or its just condensation from sitting overnight or whatever rolling around in the excess carbon and coming out the tail pipe.

either that or youve done a head gasket

[JustCallMeOrlando]

It's probably not oil. Lemme hypothesize. (?) I'm with Jamie in saying it's probably an air leak, which will cause both problems. An air leak will also cause your car to run pig rich, carboning up all your exhaust. When you get a bit of condensation in the exhaust (think of what your cat converter is doing too) you will get water in the exhaust which turns into a black liquid which spits out the exhaust. My car does this too, the black marks on my driveway will attest to that.

[stradlater]

Agreed. I get black shit out my exhaust all the time. Ofcourse that's for mildly different reasons.

[VeeP]

well the black stuff feels oily. . .ill look into it further.

Ok so before i rip my fuel system to pieces - the fuel pressure regulator looks just like a wastegate actuator thingo doesnt it? im gonna pull it off and then see if there is something visibly faulty. Where can i get a new one from guys? and i havent been able to find a fuel filter still?!?!?

and btw whats that pssshhh sound every time i open te fuel tank cap?

[ndgcpr]

mine usually pssshhh when i have filled it to the top and drive it for a few weeks and them fill it up again, not all the time, sounds odd.

I think your looking for the wrong thing with respect to a fuel filter. mine is a metal thing not clear plastic so it could be mistaken for something else. follw the fuel lines, you should be able to find it easily as well as the fuel pressre regulator. I can't think at the moment if I am mistaken the 1J for the 1G but it should be at the front of the rail with a little pipe running to the intake chamber and a pipe (which will spray fuel when the pump turns on) running back to the tank.

I was a little vauge on the AFM - fuel pump bit. It does go through some relays and stuff but basically it runs the fuel pump.

[thechuckster]

I can't think at the moment if I am mistaken the 1J for the 1G but it should be at the front of the rail with a little pipe running to the intake chamber and a pipe (which will spray fuel when the pump turns on) running back to the tank..

yup, the FPR is attached to the fuel rail it has a small vacuum line going to the plenum so it can adjust fuel pressure relative to manifold vacuum, it also has a hard line or flexible EFI hose heading underneath the intake manifold then off to the chassis rail where it connects to the hard line to return to the tank

I was a little vauge on the AFM - fuel pump bit. It does go through some relays and stuff but basically it runs the fuel pump.

yes - in the AFR is a switch that (assuming you're using the factory loom) will prevent the fuel pump from running if no air is being sucked into the engine. Cranking the engine will suck enough air thru the AFM to trigger the switch.

From there it runs into the cabin and (via the ECU i think) then triggers the fuel pump relay.

re: filter: the factory setup is a metal can attached to the engine block near the mount on the intake side - it has stiff-as-buggery banjo bolts on both ends.

If the filter was blocked you would be running lean, not rich.

[VeeP]

ok i got the stupid regulator off as a last ditch resort and im gonna replace it. . .but where from? 2 jap wreckers said they dont have one? is there any place in perth where someone knows i can get on from?? Also. . . i cant believe toyota wanted 240bux for a lil piece of metal like this FPR. . its ridiculous!

Oh, and are there any other fuel pressure regulators from another motor that are interchangeable with the 1G-GTE one? (GEN3 motor)

[love ke70]

maybe you should consider identifying the problem rather than just randomly changing parts...
have you done a compression test, put a a/f ratio reader on to make sure it is rich?
identify problem, THEN fix it

[brett_celicacoupe]

you should have just put a fuel pressure gauge on the line and monitered the fuel pressure. as said above, its probly worth finding the problem rather than changing parts and hoping for the best