Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Peterbos on 15 November 2011, 12:15:15

Title: 2.5 V6 engine fault update
Post by: Peterbos on 15 November 2011, 12:15:15: More help please.
First a brief diary of event so far.
Aux belt tensioner failed and took out the belt. These items were replaced. (the engine did boil up but only lost 2 pints of coolant)
Engine started fine but cut when it got to temp. Leave for 5 mins restart ok then cut and so on.
Suspect crank sensor now replaced.
Engine started ran for 1 min or so and cutout and now will not fire at all.
Paperclip test shows 73 mass air sensor voltage low.
I've checked all the pipework around area where I was working when replacing the belt and can fine nothing obvious. All pipes and rubber conectors appear ok and there is nothing I can see hanging. All the plugs are conected. All the larger pipe clips are tight.
Any ideas would be appreciated.

Thanks Pete :-\
Title: Re: 2.5 V6 engine fault update
Post by: tunnie on 15 November 2011, 13:01:09: V6 will start with a MAF disconnected, any other codes?

Also, not sure why a snapped auxbelt would cause you to loose coolant? It will stop the water pump turning, but it should not create a leak.
Title: Re: 2.5 V6 engine fault update
Post by: RobG on 15 November 2011, 13:04:36: Quote from: Peterbos on 15 November 2011, 12:15:15
More help please.
First a brief diary of event so far.
Aux belt tensioner failed and took out the belt. These items were replaced. (the engine did boil up but only lost 2 pints of coolant)
Engine started fine but cut when it got to temp. Leave for 5 mins restart ok then cut and so on.
Suspect crank sensor now replaced.Engine started ran for 1 min or so and cutout and now will not fire at all.
Paperclip test shows 73 mass air sensor voltage low.
I've checked all the pipework around area where I was working when replacing the belt and can fine nothing obvious. All pipes and rubber conectors appear ok and there is nothing I can see hanging. All the plugs are conected. All the larger pipe clips are tight.
Any ideas would be appreciated.

Thanks Pete :-\
Genuine?
Title: Re: 2.5 V6 engine fault update
Post by: Andy B on 15 November 2011, 13:16:18: Quote from: tunnie on 15 November 2011, 13:01:09
........

Also, not sure why a snapped auxbelt would cause you to loose coolant? It will stop the water pump turning, but it should not create a leak.

It will if you ignore it for long enough. No water pump = no coolant through the radiator = no heat transfer = gets very hot = it boils over & spews coolant through the relief valve in the header tank = loss of coolant ;) ;)
Title: Re: 2.5 V6 engine fault update
Post by: tunnie on 15 November 2011, 13:19:09: Quote from: Andy B on 15 November 2011, 13:16:18
Quote from: tunnie on 15 November 2011, 13:01:09
........

Also, not sure why a snapped auxbelt would cause you to loose coolant? It will stop the water pump turning, but it should not create a leak.

It will if you ignore it for long enough. No water pump = no coolant through the radiator = no heat transfer = gets very hot = it boils over & spews coolant through the relief valve in the header tank = loss of coolant ;) ;)

Good point, did not think of that. But loosing 2 pints is going some!
Title: Re: 2.5 V6 engine fault update
Post by: Peterbos on 15 November 2011, 16:05:33: The coolant loss was thro the header tank filler cap and yes genuine sensor.
Title: Re: 2.5 V6 engine fault update
Post by: JamesV6CDX on 15 November 2011, 16:23:27: When it actually runs, does it run on all 6?

I sent you a PM yesterday... :y
Title: Re: 2.5 V6 engine fault update
Post by: Peterbos on 16 November 2011, 00:45:58: Fired up second or third piston up and ran sweet as a nut for around a minute then just cut out and died.