Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: bestseany on 16 February 2007, 20:07:13

Title: Damn! Now my car's going into limp home mode
Post by: bestseany on 16 February 2007, 20:07:13
On the way home from work I got the dreaded engine management light and limp home mode. Felt like I had a 1 litre engine with the amount of power I had. Stopped at the chippy, and it was fine for 2 minutes and then it did it again.

Got my paper clip at the ready, wish me luck....
Title: Re: Damn! Now my car's going into limp home mode
Post by: Jimbob on 16 February 2007, 20:46:49
Good luck mate.

FYI, new tech2 contact.... Dickens Vauxhall in Wrexham
mines booked in for gearbox update for £36.72!

Dunno if you ever got your keys sorted, if not may be worth a try.
Title: Re: Damn! Now my car's going into limp home mode
Post by: bestseany on 16 February 2007, 20:54:01
Cheers mate. I'll keep that in mind for when I want to get the key done (not done it yet)

Right. My fault codes.....

135 - Check engine lamp - low voltage
89 - Oxygen sensor heater - low voltage
91 - Oxygen sensor heater - high voltage
19 - RPM signal (crankshaft sensor) - incorrect signal
74 - Air flow sensor - high voltage
16 - Knock sensor 1 - no change in voltage

The first 4 can be ignored I think, the lambda sensor heater has been throwing up a fault since I had the car.

I am concerned about the knock sensor and the air flow sensor though. I can't see any shorts in the wire. Do these two sensors share a loom at any point? Where is the knock sensor?
Title: Re: Damn! Now my car's going into limp home mode
Post by: Jimbob on 16 February 2007, 20:55:34
Lot of faults, nothing sounds major.

Battery is running at right voltage isn't it?

Reckon the knock sensors causing the limp mode, used any different petrol?
Title: Re: Damn! Now my car's going into limp home mode
Post by: bestseany on 16 February 2007, 21:03:56
No, I always use Shell standard unleaded mate.

I haven't got a multimeter on me, but I'm not getting the alternator light coming on whilst the engine is running.

Any idea where the knock sensor is? A "no change in voltage" fault must mean it's disconnected mustn't it?
Title: Re: Damn! Now my car's going into limp home mode
Post by: Jimbob on 16 February 2007, 21:23:13
That many voltage / signal things sounds like a red herring to me, hence the battery idea.
Known a few batterys start going and cause funny things like this (with no alternator light).
Title: Re: Damn! Now my car's going into limp home mode
Post by: bestseany on 16 February 2007, 21:30:01
The battery is only about 5 months old mate and I've not had any issues with charging etc before.

The only thing that is suspect, is the air flow sensor and knock sensor 1 are quite close to each other, so I though they might be in the same loom and shorting on something together.
Title: Re: Damn! Now my car's going into limp home mode
Post by: Jimbob on 16 February 2007, 21:31:55
That does point it away from that then.

Thats me out of ideas.
Title: Re: Damn! Now my car's going into limp home mode
Post by: jud1255 on 17 February 2007, 11:20:39
sorry cant help with ya problem, but i was wondering where your got the info regards bridging the pins and where you got the codes from  etc.
without me spending a lot of time searching .
Is it possible for you to explain or give me the necassary links
mines a 98 elite 3-0cc
thanks jud
Title: Re: Damn! Now my car's going into limp home mode
Post by: salvo3.0 on 17 February 2007, 11:29:45
had the same problem a few months back, got new knock sensor from vauxhall for 46.50 , got local garage to fit it , now works fine.
my sensor melted because of heat sheld , they is 2 sensors on each side of engine.
Title: Re: Damn! Now my car's going into limp home mode
Post by: TheBoy on 17 February 2007, 18:48:37
check wiring to knock sensors, often damaged.

you have a 19 as well...
Title: Re: Damn! Now my car's going into limp home mode
Post by: bestseany on 17 February 2007, 19:35:53
I though 19 was normal when the engine isn't running?

I played around with a few wires last night, couldn't see any split or broken ones though. Anyway, my playing seems to have done the trick and it's worked fine today during the 100+ miles I've done. Strange.
Title: Re: Damn! Now my car's going into limp home mode
Post by: TheBoy on 17 February 2007, 19:38:07
Quote
I though 19 was normal when the engine isn't running?

I played around with a few wires last night, couldn't see any split or broken ones though. Anyway, my playing seems to have done the trick and it's worked fine today during the 100+ miles I've done. Strange.
31 is normal with engine not running. 19 is a sign of a severely failing sensor...
Title: Re: Damn! Now my car's going into limp home mode
Post by: bestseany on 17 February 2007, 19:39:01
But I didn't get a code 31, and my engine was off...  :-/
Title: Re: Damn! Now my car's going into limp home mode
Post by: TheBoy on 17 February 2007, 19:41:26
Quote
But I didn't get a code 31, and my engine was off...  :-/
Coz you got the 19 instead ;)