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Car Wont Start

Lukas 33

By Lukas 33,
in Engines & Forced Induction

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Lukas 33 Proficient

Lukas 33

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Hey guys Im having some troubles trying to get my car running,

I have an rb25/30 in my series 1 r33 gtst. The ecu has not yet been tuned but I dont see why it should still not start and run roughly. ECU is a microtech LT12s. You might mock it but thats what the majority of tuners are good at around here.

It is only sparking on Cylinder number 2 and only putting fuel into number 6. What the hell could be causing this? I have checked all the connections many many many times to make sure everything is all plugged in. I have changed the plugs to some new ones at the right gap and there is still only spark on cylinder number 2. I have also fiddled with the CAS and still nothing. I have also tried fitting a working CAS and it is still doing the same thing.

What could be doing this? Could it be that the igniter is broken? Would the igniter being stuffed affect the fuel injection or could it be a coincedence and something else is f**ked at the same time. I am kind of hoping that the ECU isnt f**ked but I dont have a standard one to test on the car just for initial start up.

All suggestions welcome :happy: Thanks guys

Edited by Lukas 33
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blind_elk Grand Master

blind_elk

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I would suggest that the LT12 isn't configured correctly to run a RB engine in sequential spark/injection mode. Get it to the tuner to have it set up correctly.

BTW -spark plugs themselves have no effect on spark delivery or timing.

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Lukas 33 Proficient

Lukas 33

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yes i agree it should kick over and run terrible.

To me it seems that you may have to have your ecu tuned, depending on the item, or worst case your ecu maybe dodgy? is it 2nd hand or brand new?

The ECU is second hand. However it was from an rb25 and the car WAS running for a couple of laps around the block before this kind of shit happened when trying to start

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Lukas 33 Proficient

Lukas 33

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tuning the ecu wont make much difference if the injectors and coils are not firing. have you checked that you are getting the signals to fire the coils/injectors?

Nah I havent. Where exactly should I look for signal to the injectors? Or just check power is getting to the injector plugs? I doubt 5 of 6 injectors are broken but I will check if there is any signal being sent to them. Should I just check for a signal between the ignitor and the coils? Do you suspect broken injectors or coils? Cheers

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blind_elk Grand Master

blind_elk

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The injectors should have permanent power when IGN = ON. The ECU switches to earth to open the injector.

Pull the CAS, turn IGN -> ON, slowly rotate CAS shaft and listen for injector and coil activity.

Check that you haven't bent the pins inside the connector plugs when you connected everything up.

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Lukas 33 Proficient

Lukas 33

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The injectors should have permanent power when IGN = ON. The ECU switches to earth to open the injector.

Pull the CAS, turn IGN -> ON, slowly rotate CAS shaft and listen for injector and coil activity.

Check that you haven't bent the pins inside the connector plugs when you connected everything up.

Yeh I have pulled the CAS off and have rotated the shaft around. It is still only activating inj 6 and coil 2. No pins are bent

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Lukas 33 Proficient

Lukas 33

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It is sparking to all cylinders now. But why no fuel to anything but number 6? Could it be that the ignitor may stilll be faulty? Is it worth buying another ignitor and stock ecu to see if this could be my problem?

If my injectors plugs or ignitor had a crap connection would that put the car into a sort of limp mode?

Main question. should I try getting a new ignitor and ecu and trying that out?

Cheers

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daisu Mentor

daisu

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The ECU is second hand. However it was from an rb25 and the car WAS running for a couple of laps around the block before this kind of shit happened when trying to start
It is sparking to all cylinders now. But why no fuel to anything but number 6? Could it be that the ignitor may stilll be faulty? Is it worth buying another ignitor and stock ecu to see if this could be my problem?

If my injectors plugs or ignitor had a crap connection would that put the car into a sort of limp mode?

Main question. should I try getting a new ignitor and ecu and trying that out?

Cheers

So it was working fine, then it stopped working, now the coils are working but you haven't found and fixed any faults? Sounds like the ECU is dodgey or the loom/connectors between it and the coils/injectors.

The ignitor should have no effect on your injectors (if that is what you were asking).

Pull the CAS out and plug in a stock ECU and see if turning the CAS fires all the coils/injectors. If so then it would point to your ECU being faulty. If not then check the loom out.

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Lukas 33 Proficient

Lukas 33

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So it was working fine, then it stopped working, now the coils are working but you haven't found and fixed any faults? Sounds like the ECU is dodgey or the loom/connectors between it and the coils/injectors.

The ignitor should have no effect on your injectors (if that is what you were asking).

Pull the CAS out and plug in a stock ECU and see if turning the CAS fires all the coils/injectors. If so then it would point to your ECU being faulty. If not then check the loom out.

Ok I will get it checked out as soon as I can and get a stock ecu on tuesday or so. Im 350kms from the car so gotta try and get a mate to do it at the moment. I would much rather the loom be faulty than the ecu >_< Should i put the ignition to ON and just unplug one injector plug at a time and put the test light on each plug to see if they all have power? Will try and get an electrician friends out there to have a look

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