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Thread: Checking Fuel Pump Pressure

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    hyder_m29's Avatar
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    Exclamation Checking Fuel Pump Pressure

    Car: Integra 92 - EFI ZC engine

    Problem: Car takes too long to cold start - about 5-6 tries, then stutters during the first few minutes driving. When cold starting, I have to hold down the accelerator pedal and even after starting, the rpm stutters at under 200 for about 5-7 seconds before it gets normal. I noticed that when I pump the pedal for a while before cold starting, it starts a little better.

    Steps Taken:

    - Fuel injectors tested and cleaned
    - Dizzy timing set correctly with a timing gun
    - Throttle body and IACV cleaned
    - Battery tested
    - Spark plugs and wires replaced
    - Tappets adjusted

    My next suspect is the fuel pump, unless someone chimes in otherwise. It looks like I'll need to drop the tank to get the fuel pump out . So I was hoping there was a way to test if it's really the pump dragging things down. How I can check the fuel pump pressure, and what should the pressure be?


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    SER_GTR's Avatar
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    Default

    Pressure Is Checked Where Filter Connects Fuel Rail....!

    No Need To Take Out Fuel Pump

    As You Say It Gets Better When You Start With _Pedal Pressed

    So Check Your TPS Sensor..It May Need Adjustment..ECU Might Have Reading In Negative....
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    If it only happens on cold starts its worth checking the idle up cold start valve,it has a water feed just like Iacv,when the water is cold the valve allows the engine to idle at a higher rpm until the wax inside it warms up and shuts off the air hole in the throttle opening.It should be located at the bottom of your throttle body or intake manifold .also check the resistance value of your coolant temperature sensor if this is faulty your ecu will not be giving correct fuel enrichment hence causing cold start problems.

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