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cyrnel · 03-22-2005, 04:51 PM

Any difference when warm vs. cold? Is it better if you recently shut down?

If temperature makes a difference I'd look at the coil or crank position sensor. If you need a place to start then the coil's much easier to get to.

If it's a first start of the day thing then I'd check the fuel system. (How long since filter was changed?) Get a pressure gauge (~$25) and test at the fuel rail valve. Should be ~31psi idle, ~41 peak. At key on it should jump to 8-15 for the ECU prime then up to normal once started. Problems can be at the filter, regulator, or pump. If you want to cheat, have someone kink the return line before you turn the key. If it fires more quickly than normal you're closer to knowing the problem.

Useless nitpick: if you're describing symptoms to the shop then cranking and turning over are essentially the same thing. Turning over often implies at least partial ignition but it's ambiguous. Remember the origin of "cranking" is from using a handle out the front of the engine. "Firing" obviously indicates some kind of air/fuel ignition.

03-22-2005, 04:51 PM	#4 (permalink)
cyrnel Adequate Location: In my angry-dome.	Any difference when warm vs. cold? Is it better if you recently shut down? If temperature makes a difference I'd look at the coil or crank position sensor. If you need a place to start then the coil's much easier to get to. If it's a first start of the day thing then I'd check the fuel system. (How long since filter was changed?) Get a pressure gauge (~$25) and test at the fuel rail valve. Should be ~31psi idle, ~41 peak. At key on it should jump to 8-15 for the ECU prime then up to normal once started. Problems can be at the filter, regulator, or pump. If you want to cheat, have someone kink the return line before you turn the key. If it fires more quickly than normal you're closer to knowing the problem. Useless nitpick: if you're describing symptoms to the shop then cranking and turning over are essentially the same thing. Turning over often implies at least partial ignition but it's ambiguous. Remember the origin of "cranking" is from using a handle out the front of the engine. "Firing" obviously indicates some kind of air/fuel ignition.