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Author Topic: Omega Engine management coolant sensor  (Read 397 times)

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whiskey mike

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Omega Engine management coolant sensor
« on: 03 July 2019, 14:11:50 »

I have the Omega 2.6 v6 and the engine management coolant sensor has failed.  I have purchased a new one and need some guidance on how to fit it please.  As always any help would be appreciated.
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Nick W

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Re: Omega Engine management coolant sensor
« Reply #1 on: 03 July 2019, 14:31:24 »

Disconnect the wiring plug from the old sensor
Clean around the threads with a small wire brush.
Unscrew the old sensor.
Screw in the new one.
Fit the wiring plug.


You'll probably need to remove the intake plenum for access.
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Andy B

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Re: Omega Engine management coolant sensor
« Reply #2 on: 03 July 2019, 14:34:46 »

the ECU temp sensor & temp gauge sender unit are both right at the back of the engine.

http://www.omegaowners.com/forum/index.php?topic=113765.0
« Last Edit: 03 July 2019, 14:39:07 by Andy B »
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Diamond Black Geezer

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Re: Omega Engine management coolant sensor
« Reply #3 on: 03 July 2019, 14:36:46 »

Once plenum is off (see howto) it's nice and obvious, as Nick says, as hard as unscrewing/screwing in the new one.
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Re: Omega Engine management coolant sensor
« Reply #4 on: 03 July 2019, 14:58:19 »

Double check the voltages of the plugs as the ecu coolant temp and purge valve plugs are the same but the ecu one is 5v and the purge valve is 12v.

And they are next to each other so easy to confuse ::)
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whiskey mike

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Re: Omega Engine management coolant sensor
« Reply #5 on: 03 July 2019, 15:13:10 »

Thank you for information. Just a real pain the proverbial .... will have another go  :(
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Re: Omega Engine management coolant sensor
« Reply #6 on: 03 July 2019, 17:24:44 »

Double check the voltages of the plugs as the ecu coolant temp and purge valve plugs are the same but the ecu one is 5v and the purge valve is 12v.

And they are next to each other so easy to confuse ::)
Suffice to say that the ecu temp sender is pretty reliable...

Until you put 12v through it.
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whiskey mike

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Re: Omega Engine management coolant sensor
« Reply #7 on: 05 July 2019, 19:23:02 »

So far I have changed the two coil packs, the temperature sender unit and spark plugs.  The car will start and runs sometimes for 15 minutes and other times it will run for 1 minute then starts running rough.  At a loss as to what's causing it.  Once again any assistance would be appreciated.

 :-\ >:(
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Shackeng

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Re: Omega Engine management coolant sensor
« Reply #8 on: 05 July 2019, 19:25:55 »

Double check the voltages of the plugs as the ecu coolant temp and purge valve plugs are the same but the ecu one is 5v and the purge valve is 12v.

And they are next to each other so easy to confuse ::)
Suffice to say that the ecu temp sender is pretty reliable...

Until you put 12v through it.

Would you care to share how you know that? ::)
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Re: Omega Engine management coolant sensor
« Reply #9 on: 05 July 2019, 20:01:12 »

I managed to get the plugs swapped over following some work under the plenum, possibly a thermostat swap.

Car started and ran OK, so nothing obvious, drove it four miles and parked up. Got back in it ten minutes later and car wouldn't start... Symptoms same as failed crank sensor plus stink of fuel. Car only started with fuel pump fuse pulled.

Basically temp sender had blown and defaulted to - 40C causing the ecu to dump the fuel rail into the cylinders whilst cranking.

New temp sensor and swap the plugs over sorted it :y
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Re: Omega Engine management coolant sensor
« Reply #10 on: 05 July 2019, 21:36:42 »

I managed to get the plugs swapped over following some work under the plenum, possibly a thermostat swap.

Car started and ran OK, so nothing obvious, drove it four miles and parked up. Got back in it ten minutes later and car wouldn't start... Symptoms same as failed crank sensor plus stink of fuel. Car only started with fuel pump fuse pulled.

Basically temp sender had blown and defaulted to - 40C causing the ecu to dump the fuel rail into the cylinders whilst cranking.

New temp sensor and swap the plugs over sorted it :y
Ecu sensors are all 5v, the solenoids are all 12v ;)
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