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[Richiel_7]

Hi all,

After getting cheesed off with electrical gremlins on my Alfa's I have switched to a lovely 2.2 auto Omega.

Having a small gremlin which I need advice on.

On start up the car can sometimes take longer than normal to fire - it is accompanied by the engine light and check auto gearbox message. On turning the ignition off and trying again, car fires quicker and all is fine. Even if I drive with the fault showing, the car drives perfect - no gear issues or hesitation etc. Also if I correct the fault by refiring the car - the fault never appears while driving - only at start up.

Fault code showing is P1781 - engine torque signal circuit.

My gut feeling sends me to the cam sensor as it is a start up fault - but I only had this changed 3 weeks ago. The reason I had the sensor changed is because sometimes the engine light would come on whilst driving (not just from start up like it does now) although then, I never pulled up a fault code and don't know if the check auto gearbox was showing because it was before I changed my faulty header tank and the check coolant light was always on!

The cam sensor I bought was not GM but was (I'm told) a reliable make - FACET.

My question is, where do I go from here. Could I have two duff sensors or is it more likely a fault elsewhere?

Any help gratefully received!

[dbug]

Pattern cam sensors not good news mate - go for genuine Vx

[albitz]

Agreed. I would bet a genuine GM sensor will cure your problems.

[Richiel_7]

Okeydokey. Thanks for the responses!

I'll trog down and try to "trade" in the duff one for a vx tomorrow. Why do they sell these things if they don't work - it was still £40!

I'll let you know how it goes!

[Richiel_7]

Hmmm. Would I be right in my assumption that people advertising genuine Vx ones at cheap prices on eBay, aren't actually genuine?

GM use siemen, right? Would a siemen one do or should I ONLY go to a vauxhall dealership?

Thanks

[TheBoy]

Accept that most branded stuff on Ebay is fake.

For that reason, I'd get one from a dealer, or if 3rd party, ensure it has the GM hologram on the sealed packet.

[Richiel_7]

Hi all - just an update. 

Success!!!

The hologramed GM part may have been expensive at £80 but it did the job. No more fault lights. Start up feels smoother too. I shall now avoid aftermarket sensors forever!

Thanks for the advice.