Setting the turbo up through dual webers could be a challenge bigger than setting up the damn Motec! Plus 40mm simply wouldn't be big enough

Feral..... the injector resistance has been checked.

TSillay.... the Dizzy should be fine.... it's the same unit that was used previously in this engine set-up, which includes the loom, computer and Mapping. I think something must have happened during the transplant.

I spoke with Motec yesterday, they gave me a couple of things to check.

1. The only way the computer knows thatthe engine is turning over is when the "ref" wire gets voltage. The fact that it thinks the engine is turning over when we do the injector diadnostic test suggest that the ref wire is getting some interference or electrical noise. Also, the fact that it only thinks the engine is turning over when the injectors are fired, would suggest that the intereference is coming directly from the injector wiring. So this has to be checked.

2. Second thing to check is the resistance of the injectors at the ECU end of the loom. It is possible that we have enough power to drive the node light on the injector (which shows it pulsing while cranking) but not enough power to drive the injectors.

What I am hoping to find is that we have some kind of a short, or other proble in the injector wiring, which in turn is interfereing with the "ref" input of the ECU.

Thanks guys for all the ideas, I'll report back with a progress report later in the week..... can't get to the car until tomorrow night!

Good luck man, You will get it.
This is just another chicane on the race track of life
It will all be worth it when you get it going

OK did some more checks.....here are the results.

1. Checked for voltage at 'Ref' input - it has 5volts! Mark at Motec told me it should be Zero when the engine is not cranking. Any voltage at all would be interpreted by the ECU as the engine turning over.

2. Also checked the 'Sync' input..... Zero volts here...I would assume this is correct.

NB: There is a power and an Earth going to the Dizzy already (Pins 26 & 27) so I assume that the 'ref' should read zero volts like the 'sync' when not turning over - can some one confirm this for me?

Also, when I had the multimeter on the 'Ref' wire, the injector test worked..... as soon as the probe was taken off the 'ref ' wire the injector test crashed again, as the ECU thought the engine was spinning....weird.

I also tried unplugging the Dizzy and got the following result.

1. Injector test worked fine - did not crash.

2. Still had a reading of 5 volts at the 'ref' wire..... so why did the test work?

On the injector side of things -

1. Resistance at injectors is 1.1 ohms.

2. Resistance atthe ECU plug was hard to get a good reading. lowest was 1.4 ohms on all..... however higher readings were also recorded if the loom was moved ...... anywhere from 1.8 to 3 ohms. Would that be enough to drain power from the injectors - enough to stop them from opening fully?

Still chasing them gremlins!

Quote:
Your volt meter could be passing enough current to make the circuit. Most analog meters have like 10kOhm impedance and the digitals have 10M Ohm. I'm kinda guessing since I don't have them in front of me, it's usually writen on the dial of the meter or the back. The next time you call Motec, you might want to ask.
Good luck

yeah.....your right....that's what i thought might be happening.

Good point, to check oxygen sensor, you need a 20 Megohm resistance voltmeter. Not all digital meters are that good.

Yeah...I only have a cheap multi meter unfortunately..... But That's ok, I have an Auto Electrician coming on Tuesday night, and he has a scope, so we should be right.