When starting from cold car sometimes car sounds off cylinder and smoky and down in power. all ready had a new pump problem still exists. have been told maybe injector fault, have been to mazda dealer and they say they have never had one in with that problem and no way of testing injectors.
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It sounds like the ignition may be firing early at times. If it sounds like it is knocking and pinging then this can be ******* the engine to keep it running like this. It is better to get off the roadway and shut it down. Check for engine codes, etc.
Yes sir , you have a failing valve, soon it will snap in two....please have your head checked. You can do this yourself by placing a long-handed screwdriver , business end down to each cylinder while pressing your ear to the handle(while engine is running)...you will notice a definite difference when you hit which cylinder has the bad valve. Also makes sure the egr valve is clean and your exhaust recycle valve is not stuck.( located in the crossover pipe)
could be valve stem seals. when it sits the oil leaks down into the cylinders and is burned off when first started. isn't noticible when driving because not a lot of oil leaking into cylinders until it sits for a while and accumlates
You have the timing belt off. If the engine computer sees the Crank sensor and the cam sensor don't line up, the engine computer will shut down two injectors. It sounds stupid, but trust me. I have seen this before.
The most common cause of this condition is the check valve in the fuel pump failing, to check this hook up a fuel test guage to the fuel rail test port, run the engine for a moment and shut it down, after shout down the pressure should stay within 5 PSI of the pressure at shut down after sitting overnight, if it doesn't then the fuel pump must be replaced, the reason is the fuel drains back to the tank if the valve is defective, so you get air and no real pressure on cold start, A check of pressure on a hot running engine will not show this fault, also make sure you are usine the correct Octane of fuel, Prem fuel in a regular fuel engine will cause cold start and stalling issues in cold weather.