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[mong00sehun]

hi guys,
car made a big crack sound when staring, and since then the little car icon with the wrench is on, so the lump mode too (error code 340= camshaft sensor), and its limiting the engine to 4000 rpm
i cant find V6 camshaft sensor guide,  so where should i looking for it?  2.6 V6

[Doctor Gollum]

The assumption here is that the sensor has failed...

Don't drive the car another inch until you've checked the timing.

The sensor is easy enough to change. But in this case it wouldn't be my first check.

If you do start with replacing the camshaft sensor, and again , I wouldn't under the circumstances, swap it with a known good one. From memory it can be replaced without taking anything else off. It's on the left hand cylinder head towards the front. Plug is next to it in the cable tray.

Good secondhand genuine one will be fine, but if you insist on getting a new one, then genuine or Bosch only. Don't waste your time on OE equivalent aftermarket rubbish.

[JamesV6CDX]

I second Docs post, if the car made a horrible mechanical noise, then don’t even turn the key again until the timing belt setup has been checked.

Not just by peeling the cover back a bit, but by properly removing it, and checking the tension and timing is totally correct and no FOD

[mong00sehun]

thanks guys
it was only one cracking like sound maybe it was just only the starter, because after that, the engine started normaly, sounded good, had the same power, nothing rattling sound, but i will check the timing

[TheBoy]

Ignoring wiring damage, I've never seen a Omega V6 cam sensor failure.

So if you have a P0340, you need to confirm that the sensor's wiring isn't damaged (usually caught under cam covers if those weren't replaced correctly) or check the cam timing.

Heed the warnings given by others.  Even if the cam timing is spot on, checking will give you that piece of mind

Incidentally, the cam timing can only be properly checked using a proper GM V6 cam locking kit. You can just about check its near enough not to cause damage without one, but you cant properly check or adjust it without.

[Doctor Gollum]

I've replaced a couple, including one of Josh's.

Had it been a 2.2 then I would be suspicious as to the actual cause, and in this case the unusual noise was more of a concern.