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[Andy Cas]

Hello all , My 2.0l 16v omega had piston slap like a good 'un and belched blue smoke out most mornings, with enough blow-by to please even the expats I decided to buy a short block off ebay, recon the rings / bearings etc and transplant it into my engine. I finished getting it back in today, got all the wiring done again, then oil, water, battery, turn key and... nothing. I plugged the selector switch sensor back in (Doh!), turn key and nothing again. I heard the fuel and ignition relays buzzing away to themselves, christmas tree lights on the dash and the EML on strong.
I tried starting it a few more times and must have insulted the EML - it started flashing at me.
Rev counter was going crazy too. The cam sensor wiring was cut during the removal, and I re-wired it together.
Rev counter would lift to idle, then fall. Sometimes it would sit at 4500rpm until the key went off.

I'm going to try the paperclip test tomorrow to see what codes I get.

Could the cam sensor wiring job I did cause the starter circuit to be disabled? Or is there a special way to "re-set" the ECU after a major job like this?
On a few starts I heard the starter motor "flick" for a second. but not every time.

Confused!

[JamesV6CDX]

All your earths OK?

Main multiplugs all home?

Points to an earthing issue to me.

[Andy Cas]

No loose wires anywhere. All plugs back in properly.

The three big plugs by the battery took some abuse before I realised you turn the holder to release them.

I ran out of time today but might book tomorrow afternoon off work to sort it

[damage consultant]

i'll second bad earth easy to check if you have jump leads put one to the block then to neg on batt and other to ecu to neg batt

[Andy Cas]

where on the ecu?

just on the casing? I am nervous that will fry it

[Andy Cas]

All your earths OK?

Main multiplugs all home?

Points to an earthing issue to me.

Spot on. I put a jump lead from the lifting eye to the batt neg and she fired up.
No smoke, rattles, knocks or fault codes at all!
Got me a dirty great red battery lead and bolted it from the block to the -ve terminal.

But no brakes either... The braking assist servo is not coming on with the engine start up.
I see the power steering pump provides the pressure for this to be actuated by the servo (triggered by the brake pedal), and the pipes have not been disturbed (I bent the PSP out of the way on the engine change)

Does anyone have any details on the vacuum hose circuit? This is the only thing I can think of that has been disturbed on the brake system (One hose is loose and there is a thick one broken and taped up...)
Strange how this would cause the servo not to work though.

Any ideas?

[Abiton]

AFAIK power steering and brake servo are entirely independent sytems.

The brake servo is powered by inlet manifold vacuum, so if there's a thick vac hose broken/not connected, that would explain the servo's inability to help.

[Andy Cas]

A-ha! I saw the broken hose on the bottom of the inlet manifold, and also the broken hose coming from the servo system!

I also distinctly remember breaking it off when I lifted the engine out. It was the thing I forgot.

I will have to replace it with a new / 2nd hand part (as opposed to a bodge) as I don't want the brakes to fail on me.

Without the servo assist on the brakes it takes a LOT of force to stop an omega estate.

Thank you guys. This forum continues to be a great help to me.

[JamesV6CDX]

Glad it worked mate