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Unable to start my Nissan Altima

My Nissan Altima 2006 without a warning stopped turning over. My mechanic has checked the fuel pump, fuel injectors, fuel filter and even the computer. Still to no avail. Can someone please help me. My mechanic is a good guy but he needs help and so do I.

Do you mean the engine doesn’t turn over when you turn the key or the engine turns over but doesn’t start ?

The engine is turning but will not start

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Since he’s a mechanic I assume he’s checked the coils and / or spark plugs to see if it’s firing ?

Well my Nissan is back in the shop now I am being told that the head gasket might be blown and that on the Nissan Altima that is the death nell for that car. Any solutions at this point?

A blown head gasket CAN be the death knell for any car. The Altima is not unique in that respect.
The ultimate question, therefore, is…How long ago did the head gasket become breached?
If it was breached a while ago and you have been driving it in that condition, then it is indeed possible that the engine’s lubricating oil was diluted with coolant, and as a result bearings, piston rings, and cylinder walls in the engine were damaged. Or, if the breach was of very recent origin, it is possible that the engine has survived major damage.

However, if the engine turns over but doesn’t start, I have to suspect that there is inadequate compression in the engine as a result of major internal damage, and if that turns out to be the case then you have to decide whether to get a replacement engine from a junkyard, or to ditch the car.

Hi @Shinhan. I think I have an idea worth exploring. Have the mechanic check the Cam/Cranksharft sensor. There is a known defect on the 2005 and 2006 Nissan Altima and similar vehicles in the Nissan family. If you want to see more on this topic, check out Coincidental to your post I had recently researched this car for a CarTalk story and remembered the problem being mentioned. - John G.

Have the compression checked and post the results.

If the head gasket is bad there’s usually some fairly straight-forward tests that can verify the diagnosis. The compression in one or more cylinders lowers; unusual intake manifold vacuum behavior; cylinder leak down tests don’t pass muster; cooling system pressure tests don’t pass; visual signs of coolant in the oil or oil in the coolant; or coolant pH has become more acidic due to exhaust gasses leaking into the coolant, verified by a chemical test of the coolant. These don’t always happen, but one or more usually do with a failed head gasket.

If the problem is one of the sensors – not the wiring – then the more likely one to fail is probably the TPS.