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Old 12-15-2003, 02:11 PM
sdanville's Avatar
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Join Date: Sep 2003
Location: Michigan USA
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Where is the EGR valve on the ML320 ?

Rough idle.
I would like to replace the EGR valve myself.
searching the Web- I can find nothing, let alone a shop manual on this truck. Any help appreciated a great deal.

A MONTH LATER UPDATE JAN 2004. - I cleaned the EGR Tube. It took me maybe 20 minutes tops to take it off. And I added a bottle of Gumout Emission cleaner to the gas. The check engine light went off and it idles fine. Now I add Mystery Oil to every tank and keep my fingers crossed.
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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
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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; 01-14-2004 at 11:41 AM.
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Old 12-15-2003, 04:57 PM
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Easy job! However P0 400 doesn't mean that the valve is bad.
Most of the time you will find the EGR valve pipe clogged-up.

The valve is behind the RIGHT cylinder head.
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Old 12-15-2003, 07:24 PM
sdanville's Avatar
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Join Date: Sep 2003
Location: Michigan USA
Posts: 315
clogged pipe EGR ML320 ? - it Worked !

well thank you very much for the reply.
I will attempt to locate it---then remove the pipe and clean it before I buy a new valve.

Any tips on doing this? I was only able to reach back and take the 3" rubber hose off the EGR. Could not even see a metal tube.

12/24/03 update ..I located the EGR Tube with a mirror and lighting. Removed the big plastic intake tube to make room. removed & cleaned out the EGR tube and idle 80% improved. Your help was extremely vauable.

steve
__________________
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; 12-24-2003 at 01:36 PM.
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