4age won't start, was running, possible wiring issue

[skizzamods]

Car - KE70 4age

motor / part in question - AE82 bigport 4AGE with stock ecu

problem - car wont start, has no spark.

occurs/started when - Thrashed car for a night, put in garage, fitted factory heater hoses to firewall possibly disrupting wiring loom. (car has been rewired recently and ran fine for 5000kms).

Idle was rough, car would drive but sounded like only a few cylinders, had no power and would cough and splutter. Got worse very quickly then wouldnt start at all after removing heater hoses and bypassing back to how it was before. (thought it could have been an issue with hoses on the wrong way)

Thought the issue was very old tired bigport, was leaking oil everywhere and was gutless so new rebuilt bigport motor was fitted to same wiring. Same issue still present.

TESTS RAN: Tested ecu is getting power, ok. Fuel pump is priming and pressure at fuel rail when nut is cracked fuel pisses out. no arcing from plug leads to ground when held against the block. dizzy 3 pin plug was getting 8V then swapped to a different stock ECU as the existing one looked a bit shit inside. Now all 3 dizzy plugs getting 0V to ground with ignition on ECU plugged in and unplugged.

Continuity tested 3 dizzy wires back to ECU pins, continuity OK. Continuity tested ignitor plug to ECU pins, seems ok also.

Earth on body next to engine bay fuse box connected, intake manifold earth connected, chassis rail to block earth connected. ECU is earthed, tested from body to pin on ecu plug x 3 earthing plugs.


Have tried a different coil + ignitor to no avail. Currently have the whole wiring loom unwrapped as thought it could have been a broken wire somewhere. Can we pull fault codes somehow?

Any help would be great, 4age gurus. Cheers in advance.

[Trivial]

Wish I had the answer for you - best I can do is give you a bump.

Hope it works out mate, will be following the thread out of interest. Sounds like a pain in the ass.

[jondee86]

Have you got 12V at the coil/igniter positive when the key is ON ?
Have you got 12V at the injectors when the key is turned ON ?
Has the igniter outer case got a good ground to the chassis ?

Cheers... jondee86