vl commodore electrical

[aaasharmas]

my vl commodore justs cranks over but no start.
iam struggling on this for last 4 days,
the real fault is i cant get the injector pulse when cranking,we got 5v at distributor input and output, ground and 12v ignition.
we have fitted new crank angle sensor,ecu,air flow meter,ign coil but we got spark just cant understand whats shutting down the injectors,also got ign 12v to injector connectors but cant get the noid light flashing when cranking also cant fault the timinng of the engine.

[Tasmaniak]

hmmm. Thats a tough one. It's take a lot to shut down the injectors.

Have you checked out the EFI relay? This will cause a no pulse situation. I'm not completly sure that the VL has one.

Is the fuel pump priming? Is the tacho jumping when you crank it?

[VL Berlina 5speed]

well ive had this problem for a quite a while
too me and a few mechanics and elecs to figger it out
did all you did and more

reason you have no injector pulse is that once the computer goes under 9v in power it turns off,
once thats turned off you dissy doesnt receive its power supply resulting in you having - no spark or very weak - no injector pulse and the fuel pump wont run

do a voltage drop test on the starter when you crank it and see what the power goes too
do a voltage drop test on the ecu and see what that drops out at too

is the engine turning over slowly? like not as quick as it use too
as my problem was from a half seized engine,
the engine could turn over but not as quick as normal
causing the starter too draw extra power too try and make it spin but when it did it was taking the power from the ecu so it wouldn run

[VL slut]

hey im havin trouble witih my VL it has no spark or fuel pump power and the lights in the computer will not light up! i have changed cas, computer relays fuses checked wiring loom and is all ok but still no power? its giving me the shits!

[dutchy34]

i have a similar problem to vl slut, is the ecu cactus.

[detox_nath83]

need to look at the post dates bloke.....
year old

[dutchy34]

Sorry about that i thought it would be easier to tag onto this thread because i am having exactly the same issue with my car, which i use to tow & have a meet coming up soon.

[detox_nath83]

soz man
Generally no spark is a CAS problem either failing of the plug ontop. as well as power transistor and coil then leads and plugs...
EFI relay as well good luck let us know