M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Hard start after hard driving

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Old 12-25-2016, 10:12 PM
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1998 ML320, 2006 Gto, 1990 Comanche
Hard start after hard driving

When I take my ml320 for a drive and keep the rpms under 2500 for a 20-30 minute drive my ml starts right up after sitting for a day, however when I drive my car and keep the rpm between 3000-4000 for 20-30 minutes and try to start the car after a day the motor takes 4-5 seconds to crank. Does anyone have any ideas of what the issue is?
Old 12-26-2016, 07:19 AM
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2002 ML 320 & 2006 ML500
The problem is fuel pressure leak down. You will need a fuel pressure gauge. With the gauge attached, run the eng. for a minute and turn off eng.

Then monitor the gauge following the PDF instructions.
Attached Thumbnails Hard start after hard driving-fuel-pressure-gauge.jpg   Hard start after hard driving-fuel-pressure-test-port.jpg  
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Fuel Pressure Test.pdf (11.9 KB, 67 views)

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