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[Migalot]

As per the post title, how do I access this sensor?

Thanks in advance.

[frostbite]

Its intergrated into the throttlebody unlike the earlier 2.5

[Doctor Gollum]

As per the post title, how do I access this sensor?

Thanks in advance.

There are two... one is built into the throttle motor, tother is built into the accelerator pedal

Your issue is most likely that the retaining clips on the throttlebody plug are worn/damaged/missing allowing an intermittent poor contact... easily fixed with judicious application of cable ties

[Migalot]

Thanks..I think! 

My problem is that the car has an issue (and has had one intermittently) with the autobox. If I have keep the throttle pressed lightly (say, in medium traffic) and then accelerate quite lightly the revs will rise sharply and the autobox will not change up ...then it does with a donkey-kick and the limp-home light comes on. If I turn everything off and wait 30seconds, the engine is re-set normally. In contrast, if I start from nothing and accelerate hard, the autobox will change up no problem.

It COULD be the autobox or its ECU but, it COULD be one of the throttle sensors. I bought an aftermarket one (like the old ones on the 2.5), but can't figure out where it goes. I can see the throttle body on the car with a sliver clip on top. If I remove that, will I see the standard 3-pin sensor behind it?   

[Doctor Gollum]

Firstly return that new sensor for a refund... it is of no use whatsoever on the later dbw v6s.

Secondly, check gearbox level as per the guide and top up as necessary.

DO NOTHING ELSE UNTIL THESE TWO THINGS ARE DONE

Then report back.

[Migalot]

OK. Will do. 

[Migalot]

I'm getting a bit too advanced to go crawling under the car, so I just called Halfords Autocentre to ask if they could check my autobox oil and they said it was a main dealer only job. 

[aaronjb]

Well you had a lucky escape there.. maybe take it to somewhere that isn't staffed entirely by gibbons 

Perhaps Serek in Huntingdon? Or a local member in your neck of the woods..

[Kevin Wood]

If anything goes wrong with any of the DBW system components, it'll go into limp home mode (giving you about 1500 RPM) and raise some fault codes. This issue sounds like a problem with the gearbox to me.

[robson]

My local garage did mine no problem

[Migalot]

If anything goes wrong with any of the DBW system components, it'll go into limp home mode (giving you about 1500 RPM) and raise some fault codes. This issue sounds like a problem with the gearbox to me.

If that's the case, then it will have to be goodbye Omega (shame, having owned Omegas for the last 10 years).

Even though it's relatively low mileage, it's only worth about two bob and a bag of marbles...

[Shackeng]

If anything goes wrong with any of the DBW system components, it'll go into limp home mode (giving you about 1500 RPM) and raise some fault codes. This issue sounds like a problem with the gearbox to me.

If that's the case, then it will have to be goodbye Omega (shame, having owned Omegas for the last 10 years).

Even though it's relatively low mileage, it's only worth about two bob and a bag of marbles...

Gearbox ATF level check is a very simple job with the vehicle on stands or even simpler on a ramp. Any local garage should be able to do it, but make sure they know the proper way. (See guide).

[Migv6 le Frog Fan]

Also reasonably easy without the car even jacked up if your a skinny bastid like I am used to be.   

[Migalot]

Firstly return that new sensor for a refund... it is of no use whatsoever on the later dbw v6s.

Secondly, check gearbox level as per the guide and top up as necessary.

DO NOTHING ELSE UNTIL THESE TWO THINGS ARE DONE

Then report back.

Found a local garage that was happy to check the level for me. It took just over 1 litre of Dexron and all seems well at the moment. Although I haven't driven it far, the changes already seem smoother so maybe it was just a case of low fluid. 

Thanks for the advice! 

[Migalot]

Damn it! I spoke too soon.

The problem came back again this evening. I think I may have to start looking at the throttle position sensor — maybe pick up a cheapo one on eBay.

That would be the last of my attempts to fix it. If it's the gearbox itself, then I may have to just bite the bullet and get a newer car.