Injectors won't fire- Tested everything

[saiGone]

Whats up Club?
16v in my Ae86.
car was running before I spun a bearing:

Beginning:
-Swapped in a new 4age and painted the engine bay

Problem: Injectors not firing. I have full spark, and fuel pressure to the rail.
-Car cranks over very healthily
-Check engine light does NOT light up w. key on

Already checked:
-Engine grounds (pulled each ground, sanded mating surfaces should be fine)
-EFI parts (swapped AFM/ ECU/ Injector Resistor pack/ entire fuse box to a fiends running car) [all worked perfectly]
-ECU wiring (constant 12v to ecu and all 3 grounds tested to be solid)

New parts :
New Battery
Brand new FP bracket from Toyota
New Denso pump
New 3/8 Braided Fuel line.
New fuel filter

Thanks in advance.

[mideng]

Mideng

Reck the ground

[jondee86]

Pretty sure you should have a Check Engine light with the key ON. If you
don't it is a sign you are not getting 12V to the ECU. You need to give it
12V on B, B1 and BATT pins.

You can also check if you have 12V to ground at the main injectors when
the key is ON. If you have 12V and the injectors are not firing, then it is
something else pointing at the ECU not being happy.

Cheers... jondee86

[chi-town]

Jondee is correct, if there is no check engine light then the ecu is not powering up

[saiGone]

Pretty sure you should have a Check Engine light with the key ON. If you
don't it is a sign you are not getting 12V to the ECU. You need to give it
12V on B, B1 and BATT pins.

You can also check if you have 12V to ground at the main injectors when
the key is ON. If you have 12V and the injectors are not firing, then it is
something else pointing at the ECU not being happy.

Cheers... jondee86

Hey Jondee,

I'm getting 12v at b and b1 pins. E1 E01 E02 grounds check out as well.

I will check for 12v at injectors tomorrow.

Swapped in my friends engine harness from a running car, nothing changed...

thnx

[saiGone]

Car will start for a few rotations when carb cleaner is sprayed into intake

[jondee86]

Pull the fuel return hose from the FPR outlet tube. Use a spare piece
of hose to route the fuel return into a glass container. Jump the FP
test plug and see if you get a jet of fuel into the container when you
turn the key ON.

You need to know for sure that you have pressure AND flow in the rail.

Once you have sonfirmed that fuel is available, you need to check
that the injectors are firing. You should be able to feel that if you
put the end of your finger on the body of the injector while cranking.

Cheers... jondee86

[saiGone]

Pulled the fuel return hose and hit the afm flap, filled up a few cm of the glass right away. Flow is good?

I wasn't able to feel if the injectors were tapping. (held the body of them while someone cranked)

Strangely enough, the engine is starting to fart a bit and even run for 1 second. (maybe the cold-start is spraying?) [Maybe 1 injector is firing by itself? 0_o] At this point i don't think there is any carb cleaner left in the intake so i don't think that is helping combust.

Is the cold start injector on a different circuit from the other 4?

At this point i believe that my electronics might not be the issue and possible clogged injectors. (car sat for about 4 years)

*Note Maybe my Check Engine Light is burnt out throwing this whole diagnosing off!

[jondee86]

You have fuel flow so that is OK.

Clogged injectors are quite common when the car has sat for a while.

Cold start is on a completely separate circuit, and has nothing at all
to do with the ECU. However, the cold start injector only squirts while
the engine is cranking, so although it will start, it dies one second
after you let go of the key.

Can you borrow some injectors from a working engine to try ?

Cheers... jondee86

[saiGone]

Put 4 injectors in from friends car that was running 4 years ago (injectors have been off of vehicle)

Car will start after hard cranking. surges to about 2k. will die after 3 or 4 seconds unless i open the throttle.

Gonna mess with it some more. It's been a while since it's gotten this far.

[saiGone]

engine sounds good when reved Doesn't die when Throttle is open, Probably need to clean the IACV to keep idle?

Thanks for the help Jondee

[jondee86]

Have a read here...
viewtopic.php?f=9&t=12013

If the IACV does not control the idle as outlined, you need to check
if both of the small water hoses are getting hot. If only one gets warm
and the other stays cold, it's time to give the valve a clean.

Cheers... jondee86

[saiGone]

Nice. thnx

[sirdeuce]

Have you tried a jumper between Fp and Batt in the test port? I had a similar problem, fuel would pressurize during cranking and then drop after the engine started. Turned out to be the AFM fuel switch wire was broken between the AFM and the manifold. The ground for this circuit bolts to the intake manifold next to the harness cover. If the engine will run with the jumper wire it may be that ground. You could also check from the AFM plug to ground.