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[worzelof10acrefield]

Hi.
just thought i would mention that i had a very similar reving prob on my old senator and that was the coolant sensor for the ecu.
Prob nothing to do with yours but worth a mention.
Jay

[worzelof10acrefield]

BTW
this coolant sensor was 1 of 2. 1 did the dash gauge and 1 did the temp sensor for the ecu to say it was warm.
what you are experiencing is exactly what i had. ok when cold but over reving or idling at 2000rpm when warm.
Might be a good idea to see if there are 2 sensors.
hope you get it sorted soon.

[bigpaul]

latest update for all those following :-

So I took it too the local Vauxhall dealership £70 for a diagnostic the idea being that their system being specifically for Vauxhall and not generic.

Their findings were that they traced it to the throttle body and it needed to be replaced at a cost of £650 not just that it might not be the full problem but they couldnt go any further until it was replaced what a waste of time and money.

I told them that I had already replaced it twice but they said not with a new one and the old part I had purchased might be faulty although they had taken it apart and cleaned it at no extra cost and could find nothing wrong. 

My local garage had suggested the throttle sensors but Vauxhall didnt think so but kept saying the 2.6 v6 had often caused them problems.

I have noticed different numbers on the various throttle bodies I have used 8, 10, 12 so maybe it has to be in sync with the car but can find nothing to support that.

I still have the original so maybe put it back on but replace the faulty readers who knows 

[Andy H]

Get yourself to High Wycombe tomorrow High Wycombe meet confirmation.

If The Boy (The Fat Shadow) or Kevin Wood are there then they should be able to put you right. (might be worth sending each a PM first to check.......)

[Taxi_Driver]

latest update for all those following :-

So I took it too the local Vauxhall dealership £70 for a diagnostic the idea being that their system being specifically for Vauxhall and not generic.

Their findings were that they traced it to the throttle body and it needed to be replaced at a cost of £650 not just that it might not be the full problem but they couldnt go any further until it was replaced what a waste of time and money.

I told them that I had already replaced it twice but they said not with a new one and the old part I had purchased might be faulty although they had taken it apart and cleaned it at no extra cost and could find nothing wrong. 

My local garage had suggested the throttle sensors but Vauxhall didnt think so but kept saying the 2.6 v6 had often caused them problems.

I have noticed different numbers on the various throttle bodies I have used 8, 10, 12 so maybe it has to be in sync with the car but can find nothing to support that.

I still have the original so maybe put it back on but replace the faulty readers who knows 

Sorry, but you took it to Skurrays 

I took my 2.2 there, when it was under warranty.....8 times!!! and they couldnt diagnose a faulty cam sensor.....I wouldnt trust them to diagnose a fault on a bicycle! 

[Taxi_Driver]

Get yourself to High Wycombe tomorrow High Wycombe meet confirmation.

If The Boy (The Fat Shadow) or Kevin Wood are there then they should be able to put you right. (might be worth sending each a PM first to check.......)

Good suggestion 

[bigpaul]

Wish I could guys but stuck at work no such thing as bank holidays for me 

I suppose if im honest what got to me is that a local garage that my mate has used for many years not cheap but reasonable said they thought it was the throttle sensors 2 hour job £50 an hour plus parts but no guarantee that it was the problem until they took it apart  they suggested go to the dealership for a more accurate diagnostic and it hasnt helped at all

I asked the dealership about the throttle sensors they said the throttle body had to be changed before they could progress further, I dont really think they wanted the job.

I have started to give up hope 

[bigpaul]

Just had a possible break through but need your thoughts guys

Could this be linked to the throttle position sensor / potentiometer ?

I know its connected to the throttle body somewhere but cant find it for looking

[Kevin Wood]

Just had a possible break through but need your thoughts guys

Could this be linked to the throttle position sensor / potentiometer ?

I know its connected to the throttle body somewhere but cant find it for looking

Why? You've changed the throttle body and it made no difference?

The problem you have is that you haven't found someone who can diagnose it properly. The clue is in the fault codes. The throttle body and position sensors are very closely monitored in drive-by-wire systems, and yet there are no codes indicating a problem here.

You do have fuel trim errors on both banks. I'm not sure why these have been discounted but they are telling you something important. Either there is a fuel metering problem common to both banks (MAF most likely candidate here) or you have an intake air leak that's throwing the fuel trims out. I think you need to get it to a code reader that can do live data and post up the values you see here. Particularly interesting would be MAF output, lambda sensor activity and fuel trims. Please don't spend any money bases on the advice you've received from the garages so far as they are guessing, IMHO.

[bigpaul]

This is so frustrating I mean how can a Vauxhall dealership not know iys driving me mad.

The live reading were posted by Entwood way back when in November 2011 when we first talked about the engine managment light coming on.

At the time the MAF was suggested but I tested this recently by unplugging it as advised the first time i did it there was no change engine ran from cold to 80 as normal then straight up to 2000revs.
The second time I did it it went up to 3000revs after reachong 80 my understanding was that if the car ran better with the MAF unplugged than this was the problem if it didnt then the problem was somewhere else.

So there we are not any further forward and no more money to spend


 

[martin42]

wonder if it is a wiring fault on the tps side of things and thats why nothing improves the situation when parts are swapped over

[bigpaul]

certainly a possibilty I suppose would help if I could locate the TPS 

another suggestion was the accelarator Potentiometer cant find that either 

At the back of the engine there appears to be a small pot operating on a vacuum that mirrors one on the front there is a small  metal rod that goes in when you use the accelarator but then appears to stick before coming back out.

Interesting enough the rev counter is acting in the same way when driving or ticking over it sticks as you accelarate sometimes it sticks then brings the tick over down from its high reving

Sorry I only have laymans terms for you

[Andy H]

This is so frustrating I mean how can a Vauxhall dealership not know iys driving me mad.
Totally agree but unfortunately that is normal (though there must be some good ones somewhere
The live reading were posted by Entwood way back when in November 2011 when we first talked about the engine managment light coming on.

At the time the MAF was suggested but I tested this recently by unplugging it as advised the first time i did it there was no change engine ran from cold to 80 as normal then straight up to 2000revs.Chances are that the ECU has been given duff information for so long that it has learned bad habits. Someone who knows how to use Tech II should be able to determine quite quickly where the problem lies.
The second time I did it it went up to 3000revs after reachong 80 my understanding was that if the car ran better with the MAF unplugged than this was the problem if it didnt then the problem was somewhere else.Idle getting faster and faster as the engine warms up normally points a to an air leak. Again a half decent Tech II operator should quickly be able to see how much throttle the ECU calling for. If the the ECU isn't calling for throttle then you have an air leak

So there we are not any further forward and no more money to spend

Before you spend any more money take the inlet plenum off and check that the rubber seals are intact. Put it back together but try running with the 1/2" vacuum hose to the brake servo blocked off.

[Andy H]

certainly a possibilty I suppose would help if I could locate the TPS  DBW has a potentiometer (pot) on the accelerator pedal to tell the ECU what you want and another potentiometer in the throttle body to determine where the actual throttle is. The motor in the throttle body then drives the throttle until the value from the pot matches the value the ECU is asking for. I don't know which pot is the TPSor whether they are both called TPS 

another suggestion was the accelarator Potentiometer cant find that either  top of the accelerator pedal

At the back of the engine there appears to be a small pot operating on a vacuum that mirrors one on the front there is a small  metal rod that goes in when you use the accelarator but then appears to stick before coming back out.This isn't a pot, it is a vacuum operated servo that opens a flap in the inlet manifold at high RPM

Interesting enough the rev counter is acting in the same way when driving or ticking over it sticks as you accelarate sometimes it sticks then brings the tick over down from its high reving

Sorry I only have laymans terms for you

[Kevin Wood]

The drive-by-wire system actually has two independent position sensors on the pedal and two on the throttle itself. This allows it to determine if any of them is reading erroneously whereby it will drop into a limp mode which gives you very little throttle and it raises the appropriate fault codes. The fact that you don't have any codes related to the DBW system makes me think it's very unlikely that there's a fault in that area.