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Toyota Service
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Category: Lexus
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2001 Lexus IS 300 cold start extended crank. After that

Customer Question

2001 Lexus IS 300 cold start extended crank. After that starts fine till it sits overnight again. Replaced fuel pump and fuel pres regulator. Same issue. Replaced VVTI solenoid. Same problem
Submitted: 8 months ago.
Category: Lexus
Expert:  Toyota Service replied 8 months ago.

Hello. Welcome to Just Answer. Please allow me to assist you. Extended cranking usually comes form one of two sources, and both of them are related to fuel volume and residual fuel pressure. When the engine is shut off, there needs to be fuel in the injection rail, under some pressure for the next start. Toyota Scion and Lexus all have an internal one-way check valve inside of their fuel pumps. When the pump shuts off, the valve closes, and keeps the fuel in the rail and the lines from draining back into the tank. When the pump starts again, the fuel is repressurized. If the fuel pump check valve is leaking off, the fuel in the rail drains back to the tank. The extended cranking is the time it takes for the fuel pump to push the fuel back to the injectors, whilst the injectors purge the air in the lines out. A faulty in-line check valve in the pump is the most common issue here. A 'new' pump may not have a good check valve. Aftermarket pumps may not even have the valve installed. The second most common issue is dirty or worn injectors. Overnight, leaky injectors will allow the fuel in the rail to drain off into the intake manifold. This would give you a raw fuel odor when starting and some sever engine misfire conditions when it starts. If it starts up and idles OK after the extended cranking, I would suspect your replacement fuel pump is faulty. The best way to check this is via a mechanical fuel pressure gauge. Hook it up (if you have one and wan to do this), and start the engine. The pressure should be about 35 PSI. Shit the engine off and watch the gauge. If it drops to zero PSI rather rapidly (say in about 6 hours), you are losing your fuel back to the tank via a faulty inline check valve.

Expert:  Toyota Service replied 8 months ago.

The VVT solenoid, if it was the issue, would set the check engine light on and set a VVT code.

Expert:  Toyota Service replied 8 months ago.

Please confirm that you have received my input. If you have any questions, please feel free to ask. Thanks

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