Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: duke101 on 16 February 2013, 11:32:15

Title: Wont rev above about 4000rpm
Post by: duke101 on 16 February 2013, 11:32:15

Hi All, Car is a 2.5 V6 automatic....No problems until today when I put it into sport mode and used kickdown....got to between 3000 +4000 revs and then misfired that badly that it stopped accelerating at all. Tried it several times in and out of sport mode ...the same fault, locked it into first gear and again same fault. There is no noticable lack of power or misfire under normal use not exceeding around 3000rpm...the tickover at 500rpm which used to be perfect is now very slightly uneven. Code reader shows only code 19 which is incorrect rpm....any ideas please?

Title: Re: Wont rev above about 4000rpm
Post by: martin42 on 16 February 2013, 11:45:55

coil pack

Title: Re: Wont rev above about 4000rpm
Post by: tunnie on 16 February 2013, 11:48:50

Quote from: martin42 on 16 February 2013, 11:45:55

coil pack

Sorry don't agree with that.

A code reader is showing code 19, thats crank sensor  :y

Title: Re: Wont rev above about 4000rpm
Post by: tunnie on 16 February 2013, 11:49:58

You want to get that crank sensor replaced quickly, as it can fail at any time.

Can you get access to genuine GM parts?

Also double check the plugs for oil/water  :y

Title: Re: Wont rev above about 4000rpm
Post by: noel on 16 February 2013, 11:50:06

code 19 is usually crank shaft sensor ;) 
http://www.omegaowners.com/forum/index.php?topic=90540.0

Title: Re: Wont rev above about 4000rpm
Post by: duke101 on 16 February 2013, 12:01:03

Many thanks for the replies...I am breaking another V6 so i can use the crank sensor out of it to try it....

Can you get access to genuine GM parts? ......i dont have any preferential access to GM parts

Title: Re: Wont rev above about 4000rpm
Post by: tunnie on 16 February 2013, 12:05:38

Quote from: duke101 on 16 February 2013, 12:01:03

Many thanks for the replies...I am breaking another V6 so i can use the crank sensor out of it to try it....

Can you get access to genuine GM parts? ......i dont have any preferential access to GM parts

Not all V6 crank sensors are the same, they changed over the years  :y

Try AndyC for trade prices, he is a parts manager at a Vauxhall dealer  :y

Title: Re: Wont rev above about 4000rpm
Post by: feeutfo on 16 February 2013, 12:06:59

See Andyc in recommended, trade prices on crank sensor I think, as its not on tc.

Too late. :)

Title: Re: Wont rev above about 4000rpm
Post by: duke101 on 16 February 2013, 12:46:39

Try AndyC for trade prices, he is a parts manager at a Vauxhall dealer  

Will do once ive proved the fault....thanks for the advice  :y

Title: Re: Wont rev above about 4000rpm
Post by: tunnie on 16 February 2013, 12:47:56

Quote from: duke101 on 16 February 2013, 12:46:39

Try AndyC for trade prices, he is a parts manager at a Vauxhall dealer  

Will do once ive proved the fault....thanks for the advice  :y

You know what the fault, is code reader indicated crank sensor. Its a common failure  :y

Title: Re: Wont rev above about 4000rpm
Post by: noel on 16 February 2013, 14:56:00

Quote from: tunnie on 16 February 2013, 12:47:56

Quote from: duke101 on 16 February 2013, 12:46:39

Try AndyC for trade prices, he is a parts manager at a Vauxhall dealer  

Will do once ive proved the fault....thanks for the advice  :y

You know what the fault, is code reader indicated crank sensor. Its a common failure  :y

+1

Title: Re: Wont rev above about 4000rpm
Post by: duke101 on 16 February 2013, 17:22:37

Replaced crank sensor and fault has been cured as per advice thank you. Checked codes again after a run and code 31 showed up, again referring to rpm fault, cleared it ,started the engine and revved up but not been for a run yet but no faults reappeared. What is code 31 cause please.

Title: Re: Wont rev above about 4000rpm
Post by: Jimbob on 16 February 2013, 17:26:43

31 is No crank signal - perfectly normal when the engine is off :y

Title: Re: Wont rev above about 4000rpm
Post by: duke101 on 16 February 2013, 17:35:04

Thanks Jimbob, looks like were back to normal now then. Once again my thanks to those who helped with the correct advice so quickly.

Title: Re: Wont rev above about 4000rpm
Post by: noel on 16 February 2013, 22:22:32

easy fix then well done :y

Title: Re: Wont rev above about 4000rpm
Post by: amba on 17 February 2013, 08:53:06

Just out of curiosity would the failing crank sensor also cause the EML light to come on as it has stored a fault code and didn,t read any mention of that.

Reason I ask is I also have a slight hesitation over 4k although does rev beyond that...as no EML I didn,t think to read the codes stored as had assumed NO EML....NO CODE

Title: Re: Wont rev above about 4000rpm
Post by: Jimbob on 17 February 2013, 09:54:59

19 Doesn't tend to put on the EML, a huge oversight imho.

Title: Re: Wont rev above about 4000rpm
Post by: amba on 17 February 2013, 09:58:36

Thanks for clarrification,Jimbob.

Perhaps mine is crank sensor also  :(...will have a look at what codes ,if any, are stored.

Remember replacing sensor about 120k ago  ;D

Title: Re: Wont rev above about 4000rpm
Post by: henryd on 17 February 2013, 11:26:39

Quote from: amba on 17 February 2013, 09:58:36

Thanks for clarrification,Jimbob.

Perhaps mine is crank sensor also  :(...will have a look at what codes ,if any, are stored.

Remember replacing sensor about 120k ago  ;D

LOL,I should fit a new one then,it's on borrowed time anyway.

Title: Re: Wont rev above about 4000rpm
Post by: amba on 17 February 2013, 16:34:41

Checked codes and nothing stored .

Only ever gives miss when hard acceleration otherwise pulls smooth and hard.Will find old receipt for correct part # and give dealer a call in morning as expect thats the next part to fail ;D

Title: Re: Wont rev above about 4000rpm
Post by: amba on 17 February 2013, 16:52:15

Situation worse than originally thought  :-[ :-[

Last crank sensor fitted 30/04/2007 :-X think it is probably due another just for lasting that long  ;D

Title: Re: Wont rev above about 4000rpm
Post by: Jimbob on 17 February 2013, 17:05:50

I wouldnt be too quick to condemn it...

When was your fuel filter last changed?

Title: Re: Wont rev above about 4000rpm
Post by: Andy H on 17 February 2013, 19:50:07

Quote from: Jimbob on 17 February 2013, 17:05:50

I wouldnt be too quick to condemn it...

When was your fuel filter last changed?

When were the plugs last changed?

Title: Re: Wont rev above about 4000rpm
Post by: amba on 17 February 2013, 20:02:48

Both fuel filter and plugs replaced less than 10k ago along with leads and dispack . :y

Will have a close look at 2/4/6 bank as did have a whiff of oil earlier,although oil and breathers also done less than 2k ago too.

Fancy a morning on the car  ;D