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@2001LC @BnvS @jerryb as yall have assisted me on other issues
Most common cause of a long crank to start. Is fuel injector (FI) leak down. Typically, the longer the engine sits off. The longer the crank to start afterwards. But if engine running, shut down and re started moments later. It starts up fast (normal crank).
The FSM has a sequence for testing fuel pressure. In the sequence, is included fuel injector leak down test. This is done through tech stream, for first part of testing. Which I like to start testing, with a cold engine and fuel pump. It also test fuel pressure regulator and fuel pressure.
In general, FI leak down in excess of factory limit. Reduces fuel pressure and amount of fuel in rail. Then when we start cranking engine to start, fuel is not instantly available. Fuel and fuel pressure then needs extra time to build up in fuel rial, to get into combustion chamber (all 8 cylinders).
This assume the engine is well tuned. Which includes good: air filter, MAF sensor, spark plugs, coils, no vacuum leaks, throttle body perform as should, good compression, etc.
Note:
"Crank" or Cranking or turning over", is when engine can be heard turning trying to start-up (fire up), as we turn IG key to start. The 98-02 we hold key in start position during crank, until engine starts. In 03-07 Toyota installed "auto crank" feature. In which we turn IG key to start and release. Engine will crank until it starts, or about 5 seconds max. Auto crank, also prevents engaging starter, if IG key turned to start while engine running.
It's important your buddy understand. The fuel pump does not pump unless engine is cranking/turning over/running. We can run fuel pump engine off, through tech stream, but not by simple turning IG key to on..
