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#1
09-06-2004, 09:52 PM
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Noise with motor off key on behind intake manifold.
99 ML320.
When the key is on and the engine not running I hear a noise coming from the rear of the intake manifold. Perhaps from the air breather tube. It whirrls or runs or hums constantly.(with key on engine not running). I've been trying to figure out why I have occational no start problems. Anyone know what this is ? Thanks. So far replaced fuel filter to try & fix starting problem. The filter update and new fuel lines made no differance. I ordered a new fuel pump today. 9/9/2004
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Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles Last edited by sdanville; 09-09-2004 at 06:51 PM. 
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#2
09-07-2004, 09:52 AM
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The noise is probably from the auxiliary water pump. IT runs to help heep hot spots from damaging the all aluminum engine, esp when hot.
Would have no effect on hot re-starts. Most likely problem that causes hot re-starts is the crankshaft flywheel speed sensor.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
09-07-2004, 11:13 AM
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ML320 no start at times.
The no start situation has been when the truck is not hot.
However, the reply is greatly appreciated.
__________________
Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles
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#4
09-07-2004, 11:22 AM
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ML320 no start at times.
The no start situation has been when the truck is not hot.
However, the reply is greatly appreciated.
__________________
Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles
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#6
09-07-2004, 12:35 PM
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throttle actuator
should that continously run ?
__________________
Steve Danville what i did myself. CPS rear shocks MAS x 3. SparkPlugs (twice) Fuel pump & Filter Window switch replaced both failed horns with Honda horns. Cleaned ERG Tube Oil changes Oil consumption Fix Brake Pads A/C Recharge Anti-Freeze change X 2. Front Shocks. Monroe. $90 Mercedes Warrenty Work: Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles
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#7
09-07-2004, 08:51 PM
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My '96 S500 (M119) also makes a "whirring" noise when the key is on, engine off. Removed the air cleaner assembly and the noise is clearly coming from the throttle body area... its done it for as long as I've had the car... always thought it was normal but don't have another to compare it to...
Anyone? Thanks.
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KenP 1996 S500 W140 Coupe
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