Omega Owners Forum

Chat Area => General Car Chat => Topic started by: omegod on 24 February 2014, 09:21:54

Title: I think my mig maybe dead!
Post by: omegod on 24 February 2014, 09:21:54

Went to start it this morning and it nearly caught then made a fluffy type noise, following cranking sounded very fast and certainly not normal at all, compression gone???. AA on route to see what the score is :'(

Title: Re: I think my mig maybe dead!
Post by: zirk on 24 February 2014, 09:54:12

Quote from: omegod on 24 February 2014, 09:21:54

Went to start it this morning and it nearly caught then made a fluffy type noise, following cranking sounded very fast and certainly not normal at all, compression gone???. AA on route to see what the score is :'(

Hmmm, if its spinning, could be Cambelt gone, get the AA Man to check it first, before continually trying to crank it over.

Title: Re: I think my mig maybe dead!
Post by: omegod on 24 February 2014, 09:58:31

Well stone me, false start meant petrol washed away the oil resulting in the low compression symptoms ! started eventually and running sweet :y

Borewash apparently!

Title: Re: I think my mig maybe dead!
Post by: zirk on 24 February 2014, 11:25:14

Result then,  ;)

Title: Re: I think my mig maybe dead!
Post by: Webby the Bear on 24 February 2014, 13:44:39

Guys, what is bore wash? Out of interest.

Title: Re: I think my mig maybe dead!
Post by: Marks DTM Calib on 24 February 2014, 14:15:00

Bore wash is where unburnt fuel washes the oil from the bore sides and compromises the piston ring seal.

The question is......why all the unburnt fuel

Title: Re: I think my mig maybe dead!
Post by: omegod on 24 February 2014, 15:39:58

Quote from: Marks DTM Calib on 24 February 2014, 14:15:00

Bore wash is where unburnt fuel washes the oil from the bore sides and compromises the piston ring seal.

The question is......why all the unburnt fuel

Indeed, it caught a little then didn't start but I wouldn't have thought it would chuck enough much juice in to cause that problem?

Title: Re: I think my mig maybe dead!
Post by: Marks DTM Calib on 24 February 2014, 15:41:08

Indeed.

By the way, if you do get signs of flooding, floor the throttle and crank it for a bit.

Title: Re: I think my mig maybe dead!
Post by: Webby the Bear on 24 February 2014, 17:30:30

So basically it's over fuelling somehow? So first port of call would be looking to see if its going to closed loop or not?

Title: Re: I think my mig maybe dead!
Post by: Marks DTM Calib on 24 February 2014, 19:18:39

Quote from: Webby the Bear on 24 February 2014, 17:30:30

So basically it's over fuelling somehow? So first port of call would be looking to see if its going to closed loop or not?

In this case no as it was a cold start so would have been open loop until it was warmed up (O2 sensors only operate when very hot).

It could be a weeping injector, flooring it and cranking for a few seconds followed a normal start would prove that

Title: Re: I think my mig maybe dead!
Post by: Webby the Bear on 24 February 2014, 22:09:41

Quote from: Marks DTM Calib on 24 February 2014, 19:18:39

Quote from: Webby the Bear on 24 February 2014, 17:30:30

So basically it's over fuelling somehow? So first port of call would be looking to see if its going to closed loop or not?

In this case no as it was a cold start so would have been open loop until it was warmed up (O2 sensors only operate when very hot).

It could be a weeping injector, flooring it and cranking for a few seconds followed a normal start would prove that

Yeah, should have realised that  :-[