4AG starts, runs and dies condition (almost there) EDIT : IT RUNS NOW!

[3jcelica]

Just another thought, as you say from a delco background, I used to use the camria throttle body that had a stepper motor in it. In order to get the system to work properly with out the speed sensor I had to block off the idle control ports(of the stepper motor) that the speed sensor controls(through the stepper motor). Don't know if this applies here.

[skiddz]

perhaps check for air leaks esp big ones... thats why my 20v didnt run

[Nilezy]

Hi,

I'd suggest checking your source power for the ECU. IE IG SW on the computer. Upon switching the ignition to ON and then also while your are cranking the engine, I suspect that you have 12V in the ignition switch ON position, and you loose that when you switch the ignition switch to START, so as soon as you let go of the key, it will fire or run for a second, then die. You should have 12V to that pin when you switch to the ON position, and when you are in the START position.

This happened to Julian Edgar when he installed an RB20 into his old Skyline. He thought he was getting 12V for the ECU when he was cranking the engine, but the point where he took this 12V powe for the ECU, looses 12V when switched to the cranking position.

Cheers,
Nilezy

[Grega]

3jcelica............interesting........not sure i'd want to be disabled teh IAC.....would make normal starts a bugger
i'm using the std 4AG 100kw ECU here, so, no delco here

skiddz.........been caught out with that before on my old 2T. so yeah, in check

nilezy.........thats been playing in my head since this condition started and will check first chance i get today

(no time spent diagnosing yesterday, daughters 1st birthday which i spent driving 300km trying to get her to sleep (she is sick at the moment)

[Grega]

nilezy........power fine.

reckon i've got it
(video to come)

basically during a start event - only one injector actually spraying fuel

i had another set of injectors. same same
tried the one good injector on other plugs - worked

so in short, my injectors are knackered. which explains why it runs on aerostart

[Grega]

it runs. yay

in short - i pulled the injector baskets out of the injectors and soaked them in fuel.

one injector is still dead but the other 3 are working just fine. so runs on 3 cylinders (still pretty bloody smoothe mind you go figure)

BIG thanks to all who have input here and helped out - i really appreciate your help!

[Grega]

video of the first start

http://www.ae92.info/images/4age1stStart.3gp

(need quicktime yo)

[too_quick]

Good to hear its running mate. Injector cleaning and servicing is well worth the money. Mine ran ok but while i had them on the flow bench i soon realized how much shit was blocking them up.

Youtubed version http://www.youtube.com/watch?v=aQgCHn2Fp0M

[Grega]

thanks des

an update : its missing on number one cylinder
i have spark and i have (too much) fuel as the plug is wet and i do have spark (which fvcking hurts) at the end of the lead

remarkebly it runs really well on 3 cylinders. my missus just reminded me it is very noisy - you get that with no exhaust - exhaust is exiting @ the cat convertor

hopefully get the injectors done tommorrow.

[Grega]

thanks to B&M Fuel Systems in Richmond VIC i now have a set of fully reconditioned 4AGE 100kw fuel injectors

end result : my car runs perfectly.

YAY