Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: JayUK on 22 February 2008, 23:07:02

Title: Won't rev past 4000 rpm
Post by: JayUK on 22 February 2008, 23:07:02

Hi all. I've just picked up a car for my charity rally in April.

It's a 1995 3.0 Elite in good nick etc.

However, driving home I put my foot down to overtake and the auto box kicked down, but when the revs got to about 4000 it cut power and started bouncing the revs up and down! Eeek I thought!  :o

Anyways, I tried revving it after pulling over and in N it won't rev past about 4000, it bounces up and down like there's a rev limiter.

A little concerning, it was bought privately and the guy I bought it off said it hadn't happened to him. Soooo....

Any ideas? Please don't be an expensive fix!  :-[

Title: Re: Won't rev past 4000 rpm
Post by: Matchless on 22 February 2008, 23:23:59

Cam sensor.

Does the EML work?

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 22 February 2008, 23:31:22

No EML light, no check lights, everything's peachy apart from the not revving part :|

Title: Re: Won't rev past 4000 rpm
Post by: Matchless on 22 February 2008, 23:34:04

Yeah, but does the EML come on when you switch on ignition and go out independantly of the oil light?

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 22 February 2008, 23:35:56

Oh sorry - Ummm, Yes,  I think the EML light comes on and then goes off. I will check tomorrow, but I'm pretty sure it lights then goes off

Title: Re: Won't rev past 4000 rpm
Post by: omega_elite on 23 February 2008, 00:04:38

Hi

I had the same problem with my omega and it was the crank shaft sensor. I got a new sensor from ebay for about £25 and it takes ago an hour to change if you access it from under the car. Hope this helps

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 23 February 2008, 09:27:04

 :y

Thanks for the heads up. I've got a local garage that I use, and intended to drop it into them anyways for a good look over.

I'll ask them to change the sensor, and hopefully it'll all be hunky dory.

Apart from the revving issue (Which is pretty major!) everything else works fine :)

Title: Re: Won't rev past 4000 rpm
Post by: MutantCav on 23 February 2008, 09:57:55

Seen this issue a few times on posts, cant remember for sure what the resolution was but crank shaft sensor could well be it :)

Title: Re: Won't rev past 4000 rpm
Post by: rickyboy on 23 February 2008, 12:52:46

The revs are limited when there is either a cam or crank sensor fault.  I imagine replacing the crank sensor will fix it, if not then it'll be the cam sensor.

Title: Re: Won't rev past 4000 rpm
Post by: MutantCav on 23 February 2008, 13:12:05

I have a 95 Elite cam sensor here if you do need it...but most likely worth checking the crank sensor first...

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 23 February 2008, 13:16:28

I've done a bit of digging and it seems advice is to replace them both!  So that's going to be my plan.

Hopefully that's it, as I don't really want to spend too much on it. I'll only keep it a couple of months!   :-?

www.imagineeruk.com/2amigos

Title: Re: Won't rev past 4000 rpm
Post by: MutantCav on 23 February 2008, 13:18:24

Well I have a working cam sensor you can have for £7 delivered if you want as I know its for charidee! :)

Title: Re: Won't rev past 4000 rpm
Post by: caolan_p on 23 February 2008, 13:58:48

mine was going the same would not go over 4500 rpm got a new cam sensor its going great now ,i paid £70 for it , is there one you can get for £7? and is it a vx

Title: Re: Won't rev past 4000 rpm
Post by: MutantCav on 23 February 2008, 14:01:29

Yeah mate, its genuine Vaux off a 95 Elite...why £7...because its for charidee and its sitting around spare :)

Title: Re: Won't rev past 4000 rpm
Post by: caolan_p on 23 February 2008, 14:03:32

nice one  :y

Title: Re: Won't rev past 4000 rpm
Post by: MutantCav on 23 February 2008, 14:05:58

And if I knew what the crankshaft sensor looked like I probably have that too knocking about...

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 23 February 2008, 14:08:19

Now, if anyones got a crank sensor for a 95 3l elite - Speak up :)

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 23 February 2008, 14:10:29

Well Chris, I have no idea.
I'm sure one of the resident geniuses will post a picture though after the cam belt party this weekend :)

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 24 February 2008, 12:55:17

Just for clarification  ;D

Can anyone post photos of a crank sensor and cam sensor for a 95 3l elite?

Cheers!

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 25 February 2008, 10:50:20

Still hoping for a photo if possible :)

Also, when I started her up this morning, there was a whining noise for a minute or two. Sounds like a pump starting up and then turning off - Is that usual?

Title: Re: Won't rev past 4000 rpm
Post by: Marks DTM Calib on 25 February 2008, 11:13:34

Cam sensor failure on a V6!

The advice to change both extends ot a 4 pot and no further.

You NEED to read the fault codes and not change items willy nilly as all you will do is add more unknows.

Thre are a number of sensors which kick in the rev limit

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 25 February 2008, 12:29:25

Well it's with my garage guy at the moment, so he can read the codes and give me the news.  ::)

Hopefully it won't be too bad, else I'll have to get rid and then find a new car for April.

If it's not the cam sensor then, I'll have a spare when Chris sends it on. Doh!  :-?

Title: Re: Won't rev past 4000 rpm
Post by: MutantCav on 25 February 2008, 12:33:09

Well its in the post as of this morning mate...

Title: Re: Won't rev past 4000 rpm
Post by: JayUK on 17 March 2008, 15:33:40

OK....  

So the garage have tested the cam sensor and the crank sensor on the car, and have found that they're supplying the right readings etc.

They had another crank sensor lying around, tested that and it was kaput.

So it seems the cam & crank sensors are both ok - What would be next in line to be checked ?   :-?

Title: Re: Won't rev past 4000 rpm
Post by: Marks DTM Calib on 17 March 2008, 16:13:20

Live readings are required and full fault code read.

Knock sensors kick in the rpm limit, any sign of damage to the cables on them?