Hey guy, checkout ALLDATAdiy.com Leading Source of Factory Automotive Repair Information its a great resource and really cheap per year subscription. You will find the information you are looking for there. I have not done glowplugs on my ML yet, but did them on both of my E class diesels. Its like changing a spark plug as long as they are not stuck with carbon. If the code is telling you the controller, you could find its location a www.startekinfo.com go to MB offers a free subscription to the parts website that the dealers use. There are good diagrams there as well. Just need a credit card for verification.
2008 ML320 CDI. Iridium Silver/Black MBTex, P2 pkg, NAV, Trailer Hitch. Purchased 3/2012 CPO
2006 E320 CDI Black/Black, Leather, NAV, Harmon Kardon, HTD Seats, Rear Shade. Purchased 2/2010 CPO SOLD
1997 E300D Silver 304,000 miles SOLD
2000 VW Passat 1.8t Black/Black 366,000 miles original owner
I took some photos, but this short video is clearer. While it's a Jeep engine, it's very similar to our CDI's The module is mounted on the bottom of a bracket on the front of the motor. The module on my '08 is slimmer than the one in the video, but you'll get the idea.
modules fail and the glow plugs fail. i usually replace them as a set becasue if the glow plugs are in there for too long they wont come out, then your really SOL. module is located on front of engine twards the pass side. has a connector on the side with the glowplug output wires. check with a diagram and then each wire can be checked against ground, need to see around 2 ohms per plug.
MasterCertified, how long do you suggest before replacing the glow plugs?
I had no idea the glow plugs had a replacement interval, nor did I ever think I would have to replace the module.
I have 116k miles on mine (187,000km) and as far as I know, the plugs and modules are original. I have all service records from the dealer since the truck was new (I'm the 2nd owner) and there is no mention of either of these being replaced.
When should I replace the plugs, and should I be replacing the module (as a preventive maintenance item) in advance before it fails? Or just when it breaks?
I don't mind spending a few extra $ on problems that I know will appear in the future, to avoid having those problems.
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