1jz no start. I have fuel, timing, compression, spark

[Master Bator]

So i have a 1jz. I had it running since the rebuild over winter, but it only ran for 20 seconds then died, then i fixed the injector o ring leak i found. Now it won't start.

I have spark on all 6 plugs

I have fuel in all 6 cylinders

I have timing correct

I have 160-170 psi compression across the board. same as when i pulled the engine this winter.

All the sensors are reading.

Just changed the water temperature sensor.

Brand new plugs as of yesterday. Gapped to .028

My fuel setup is completely new for this year. New pump, new rail, new injectors, new FPR.

Injectors are 880cc, plug right in to factory harness.

Ecu is new this year. I have a power fc.

Car has yet to run on this setup (except for those 20 sec0nds)

My buddy whom i got the injectors from, also had a power fc. So he sent me his tune and i uploaded it on mine. Injectors are only running at 37 percent if i remember correctly

I tried a stock ecu as well and nothing.

Im really out of ideas at this point. And ive pretty much read every google link there is.

If it matters. this is on my 1991 Toyota Cresta.

 

[scottiedawg66]

do you have any stock injectors around?

 

[Master Bator]

yes i do. its a pain in the ass to put back in.

its pretty much firing up now. just wont stay running. currently on the hunt for a big vacuum leak

 

[Master Bator]

My buddy just told me he had it running while i was away for a moment. He said it only ran for about 20 seconds. but he got it to run by using his finger and the iacv and blocking and unblocking it, while playing with the throttle.

I think its the iacv. i pulled it and it was open. im not sure how its suppoed to be. Im cleaning it

 

[JPsToyota]

It's probably stuck shut or is shutting when it starts running? It will run fine when open, it's like having a big open vacuum leak. Vacuum leaks will make you idle higher, not kill the motor unless POSSIBLY if you are running super lean already? (not sure on that one, never tried it)

I say lower the base fuel pressure a big chunk (10+ psi), but do not drive it or rev the piss out of it until you know for sure your AFRs are ok. With 880s you are pushing in a metric-shit-ton of fuel I bet, enough to drown the motor at idle.

Whats your base FP at? If you've never had it running for more than 20 seconds in it's life, you probably will need to check your TPS and throttle plate position also. If it used to idle fine on a different setup, then stick with things you changed.

Also, a PFC should have a 'base' map also, it's like a tweaked version of the stock ECUs map. Maybe you should start with that instead of your buddys mystery tune if you can't figure out anything else.

 

[Master Bator]

we tried lowering the fuel pressure already and playing with the settings on the injectors. I can't figure anything out.


I think the best thing at this point is to put my stock injectors and ecu back in and get it running like that

 

[Master Bator]

Ive even gone as extreme as checking the spark firing order.

It just seems like the injectors are firing at the wrong times or something.

The other thing i changed was.

this car used to have a mines ECU with a greddy emanage tapped in. when i got the power fc. I had to rip that crap out. and whoever did it, instead of splicing into the factory wires they just cut them and ghetto rigged it (its was bad)

So i had to fix that. I just matched all the wires up to each other based on color and tracers.

I even went a doubled checked. all the wires are lined up.

Then i got thinking.

I really don't know if this is factory engine. and what harness this is for. Maybe the harness was modified for a different 1jz ecu and when i put it back together. i lined all the colors up, but now it won't work with the jza70 power fc.

The jzx81 and jza70 are the same ecu correct?

 

[IBoughtASupra]

Post pictures of the harness connectors that go to the ECU and the ECU connectors. Make sure they're good pictures and we will tell you. The only way they can be messed up is if you used a JZA70 wiring diagram and the harness is a Soarer or something equivalent to that since you did have to rewire the wires that were cut.

 

[Master Bator]

Main harness

Jumper harness

 

[Master Bator]

 

[IBoughtASupra]

Have you checked codes?

Those are my JZA70 connectors. Looks like Soarer ones to me. If nobody verifies by later tonight, when I get home I will check.

 

[Master Bator]

going through my wiring harness now.

 

[IBoughtASupra]

You definitely do. You will need shielded wire for that.

 

[Master Bator]

Jza70 connectors are the same as jzx81. all the ecu pinouts say "jza70/ jzx81 ecu pinout"


went through my harness.

On that jumper harness the one was de pinned so i had to improvise and i just wire connected it to the main harness. but i didn't do it right. i was reading the pinouts backwards. regardless.

I was giving the Intake air temp sensor reading from the engine to the knock sensor 1 port on the ecu.

Which is why the IAT wasn't reading anything on the datalogit for the power fc.

I got it right now. knock sensor to knock sensor and IAT to IAT.

I thought maybe that was it. Car still doesn't run.

But im wondering if maybe i fried one of the sensors now.

do you even need the IAT for the engine to run?

 

[Master Bator]

I was still reading the ecu pinout wrong. i totally have wires for the cam sensors

 

[Master Bator]

I thought i had to get it running to check codes?

can i even check codes the same way as stock even thought i have a power fc?

Also. Tried stock ecu. doesn't run.

I thought it might atleast fire even though the injectors are way bigger than stock.


Something to mention as well.

when i take the spark plugs out. they are soaked in fuel.

But when i clean them off and try to start it again. It gets really really close to staying running.

I have 2 sets of NGK 4644 gapped the same at .028

One is the set from last year and one is a new set as of 2 days ago.

Is it possible that from attempting to start the car so much and not actually getting it to run, that the spark plugs fouled?

If i take them out and lay them all on the valve cover, all 12 plugs, have a nice blue/white spark.

 

[Master Bator]

If i take the plugs out and clean them off (usually full of black sooty fuel), and put them back in. it gets closer to running. i think its a not enough fuel problem.

Its pretty consistent in the fact that on the 9-10 crank is when it fires up.

My theory is. over the first 8 cranks or so its building up fuel in the cylinders and then it sparks and fires.

If by the end of the night i can't make a list of things to check tomorrow, i'm just going to swap my stock injectors and ecu back in.

 

[Master Bator]

I put stock injectors and ecu in. still nothing

 

[Master Bator]

Why does my harmonic balancer have two notches to indicate TDC. ANyways. guess which one i chose. The wrong one.


All that work.

Set the timing properly, fired right up.

Now to solve why my afr's are 17-19 at idle. YIKES

 

[IBoughtASupra]

I never use the mark on the pulley. I use the crank gear mark and line it up on the oil pump.