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[vectrolosys]

Hello,

I completed the first long journey in the Omega today, after replacing the cam sensor, with a brand new sensor, this morning. Anyway, on driving to where I was going, I had to go up a steep hill, in second, full throttle, and around 3.5K RPM. The car lurched, ECM light came on, and we could not rev above 4500 RPM, as she went into a limp home mode. However, fuel economy remained the same, and over the whole B road/A road journey, with some town work, we got 32MPG.

On stopping and parking up, the engine started immediately when warm.

I disconnected the battery and left the car.

On leaving, several hours later, the engine started, but once slightly warm, on part throttle, things were a little lumpy, but no ECM light came on. On this return journey of similar roads, I got around 34MPG.

I parked up outside my house, so I could open the gates to get the car in. I stopped the engine, and tried to restart after around 1 minute. The car would not start, it would try to catch, but not start.

I went away and left it for 5 minutes, it started first time after the 5 minute wait and I managed to get it onto the drive and into the garage.

I stopped, tried restarting, but could not. I quickly read the fault codes off, though I'm not certain any were stored, and only had one code returned, 0335 , which is Crank Angle Sensor, a sensor I recently replaced with a £9 ebay special. The crank sensor was a genuine Siemens part from autovaux.

Is it possible I have a duff Crank angle sensor, or have I got yet another Cam sensor problem?

Thanks in advance,

James

[Auto Addict]

Sounds like a dodgy cam sensor to me. I think I read somewhere that Vx upgraded the cam sensor or something like that, could be wrong.

[vectrolosys]

Sounds like a dodgy cam sensor to me. I think I read somewhere that Vx upgraded the cam sensor or something like that, could be wrong.

Hello,

That's be annoying , as the sensor is brand new, could a ropey output from the alternator fry sensors at all? Vauxhall did produce an upgraded sensor, which had an oval connector, but it was just as unreliable as the original, so they reverted to the original design if I recall.

I spose it is possible that the sensor is faulty, but it would suprise me as it was brand new on today, and a genuine Vauxhall part.

James

[ffcgary1]

Was the part from autovux a gen vx part  :question if so  then it could be  covered under vx parts warrenty , but not sure as to if its bought from a non vx dealer :-?

[vectrolosys]

Was the part from autovux a gen vx part  :question if so  then it could be  covered under vx parts warrenty , but not sure as to if its bought from a non vx dealer :-?

I think so, as Siemens make the majority of the engine sensors, but I'll discuss the issue with them on monday....

[JasonH]

What's the alternator doing? How many volts across the battery at idle and 3000 rpm? Should see about 14.5V max.

If the regulator has blown then you get a higher voltage and all sorts of sensor problems.

[vectrolosys]

What's the alternator doing? How many volts across the battery at idle and 3000 rpm? Should see about 14.5V max.

If the regulator has blown then you get a higher voltage and all sorts of sensor problems.

This was my next port of call, I'm going to check today. Does it physically destroy sensors, or just cause some very random sensor related errors?

[JamesV6CDX]

I guess there's not much that can die on a hall sensor..

[vectrolosys]

I guess there's not much that can die on a hall sensor..

True, my concern is that it could be affecting the ECU beyond repair

[vectrolosys]

Hello,

Well, I have just been out and tested the voltage output to the battery, it's just over 14 volts at either idle, or 3000 rpm and above. I have dis-connected the battery, removed the ECU, cleaned the connectors coming off the positive terminal of the battery, cleaned all the relays and fuses in the engine bay fuse box, and put it call back together. It is still very lumpy if held on throttle at around 1500RPM, all the way to 2500RPM.

I have checked the cam sensor wiring, and cannot see any splits, frays, etc.

I am beginning to wonder if the loom may be knackered. The problem gets worse as the engine gets warmer, which does say cam sensor to me.

I am getting sick and tired of this as I need something reliable, that I can use and not have to worry about it breaking down in the middle of nowhere, with my 1 year old daughter and I stranded (until the AA arrive).

If anyone has any further ideas, I'd love to hear them, but, I am probably going to have to do something, such as take the car to a vauxhall specialist, admit defeat and let them check it over, run their diagnostic tests, etc. At the moment, I am all out of ideas .

James

[Taxi_Driver]

The code you read......could it be an old one?

Can you clear the code and see if any come back......

[vectrolosys]

The code you read......could it be an old one?

Can you clear the code and see if any come back......

Disconnected the battery yesterday, for several hours, had it disconnected today also. No ECM light has come on since yesterday morning, and last nights code was the CAS sensor, but she is very hard to restart when hot, which says CAM sensor to me.....on the journey home, she ran ok, but was still a little lump at around 1500 to 2500 RPM.

On the journey down, after a 4000RPM plus uphill full throttle blast, she went into limp home mode and refused to rev beyond 4500RPM, which again says cam sensor, however, I didn't pull the faults off on this occasion.

[VXL V6]

This is the second Cam Sensor you've fitted isn't it? I reckon you should do the Crank Angle Sensor as well now, I know the VX dealer I used to use when I had company cars always used to replace both of them regardless of which one failed first.

AFAIK on the X20XEV either sensor failing causes the limp home mode, unlike the V6. On the X20XEV the Cam Sensor is far a more common failure.

[vectrolosys]

This is the second Cam Sensor you've fitted isn't it? I reckon you should do the Crank Angle Sensor as well now, I know the VX dealer I used to use when I had company cars always used to replace both of them regardless of which one failed first.

AFAIK on the X20XEV either sensor failing causes the limp home mode, unlike the V6. On the X20XEV the Cam Sensor is far a more common failure.

First cam sensor I have fitted, and first Crank Angle Sensor.

I am thinking of doing the Crank Angle Sensor also, but I recently replaced it with a £9 new Ebay special, I guess it is totally possible that this sensor is faulty......despite being new. Wasn't there recently a batch of faulty sensors doing the rounds? supposedly new, but faulty...

[cem_devecioglu]

As an other possibility :

Rough Running; Bad Knock Sensor. [Symptom:] Higher idle, no power; running rough at RPM higher than idle. It jerks every few seconds and there is no pattern to it. It idles and starts fine.
[Diagnosis:] Check the knock sensor, it senses knock (no kidding) and retards the timing. When this gets faulty, it will make the engine have very poor power, lousy and jerky acceleration, but will start and idle fine. It's a small black plastic covered unit bolted to the block (ten mil. bolt) under the intake man. with a plug attached to it.

and ....

nope.. I didnt read the second part what you write..if dont start when warm knock sensor is out of question..