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[bottlegone]

I have owned a 2.0l Omega CD model for 4 years now and has given me NO problems and with over 120k on the clock!

The weird problem started as I accelerated from a roundabout, in the LCD dash screen it said 'Automatic Transmission' then the oil light came on and grew brighter as the car accelerated.  After a mile or so the auto trans went off in the display but the engine oil light remained on, not to mention the car went into limp mode as I left the roundabout.

To my reckoning the oil light should go off when accelerating as the pump is supplying pressure at higher speeds and only come on at low revs i.e. tickover.  With it getting brighter as the engined revved higher it has totally bamboozled me, the oil is fine and was changed 3 weeks ago inc a new filter.

What could be causing this weird behaviour?

[Mike Collins]

First check the oil level, then the voltage at the battery terminals at idle and 2000 rpm or so.

[bottlegone]

I have also been informed that the engine's idle was uneven at cold start, it dropped and then sped up a little, then dropped and so on until it had warmed up.  My wife drives the car mostly as I own an Escort rs200
and forgot to mention it

What if anything are you trying to diagnose by measuring the battery voltage? Alternator, battery (which cranks it fine), modules?

Don't misunderstand me I am relatively well versed in engine mechanics however this has really stumped me, I have heard of a bright oil light going off when revved but not the other way?!?

[rickyboy]

Check the oil pressure and clean the ICV, throttle body and surrounding breathers to cure the uneven idle.

[JasonH]

The alternator regulators can fail. You get a high voltage, above 15V, and all sorts of strange electrical problems.

[bottlegone]

Thank you for that, I will get cleaning in the morning and check the voltages...

....If it is the voltages would it be prudent to replace the alternator or are there packs you can buy to repair them yourself?

[rickyboy]

Thank you for that, I will get cleaning in the morning and check the voltages...

....If it is the voltages would it be prudent to replace the alternator or are there packs you can buy to repair them yourself?

You can refurbish the alternator, I'm sure there is a guide in the maintenance section.

[omegalyn]

Had the same prob a few weeks back, the alternator was kicking out 16.5 Vaults at high revs, got a second hand unit and everything is now ok.
if this is your problem, check for any blown bulbs in the dash as I blew three of them before I changed the alternator.

[bottlegone]

did you get the oil light progressively brightening as you revved also?

[bottlegone]

Sorted..New alternator fitted..

I noticed from cold that it's tickover is up then down then up then down until it warms up then it is stationary, also noticed the handbrake light dimming as the revs dip a little then it returns to normal.

What do you reckon, clean the breather hoses?