Glow plug light comes on after starting W210 - Page 2 - PeachParts Mercedes-Benz Forum

Jim H · #16 11-13-2010, 09:18 AM

Quote:

Originally Posted by MB300D81

...The back GPs are impossible to get to ! I read that the inlet manifold has to be removed. if this is true, what is involved in do it that?

The plugs may not be impossible, but I hear that removing the intake manifold makes it a lot easier.

Check out this thread:
Finally - Step By Step Glowplug Change - '98-'99 E300!

Olivier · #17 11-13-2010, 09:33 AM

the first one and the last one can be done with the manifold on. Its tricky tho and the manifold off is a better option, especially if one snapp as you'll need to take the IM out anyway.
Its not that bad, the bugger is the Allen nut that is under the EGR as you need to go under the cat to unscrew it.

tangofox007 · #18 11-13-2010, 10:23 AM

Quote:

Originally Posted by charmalu

My 240D has the GP light flash on from time to time through out the day. I assume this could also be a faulty GP as well?

Not on a 240D.

MB300D81 · #19 11-23-2010, 03:35 PM

Quote:

Originally Posted by KarTek

You can tell if a plug is dead when starting on a colder morning (<50) because the engine shakes and runs like crap for about 2 minutes and then the offending cylinder will come to life with a series of "tack...tack tack...tack tack tack" sounds.

The GP relay is on the top of the left front fender - a black box about 4x2x2. You can pull the 6 wire plug and test between the pins and ground to locate the one with the odd resistance. They will all be within a couple 1/10th ohm of one another.

Did this test. 1, 2,3,5,6 came out with zero reading but number 4 came out with 0.9

Does this sound right?

Thanks

KarTek · #20 11-23-2010, 06:24 PM

Doesn't sound good. I just ran out and tested mine and they produced the following results when testing across each slot on the plug and the chassis ground nearby the GP relay:

1 - 1.1
2 - 1.1
3 - 1.0
4 - 1.7
5 - 1.7
6 - 1.7

Your .9 is the only one that's close to reality. The next thing I would try is removing the intake and testing directly on the GP's. This will also give you a chance to inspect the push-on connections as well.

The manifold should take no longer than 45 min. to remove while working at a leisurely pace.

MB300D81 · #21 11-23-2010, 07:09 PM

Is it possible that I did not set the DVM correctly?

I must admit I am not that expert with DVMs.

The DVM I have has got the following options to select from :

2M , 200K , 20K, 2K, 200

Where did I go wrong.

Jeremy5848 · #22 11-23-2010, 07:13 PM

Intake manifold removal procedure varies depending on whether you have an NA or turbo engine but in any case is not difficult and gives you an opportunity to clean up the top of the engine. I have replaced only two glow plugs in my '96; one took a little working in and out before it came free but the other one unscrewed with very little effort. I used anti-seize on the threads of the new glow plugs.

Jeremy5848 · #23 11-23-2010, 07:17 PM

Quote:

Originally Posted by MB300D81

Is it possible that I did not set the DVM correctly?

I must admit I am not that expert with DVMs.

The DVM I have has got the following options to select from :

2M , 200K , 20K, 2K, 200

Where did I go wrong.

Use the 200 Ohm setting and short the leads, note the reading (should be close to zero). Then pull the six-pin connector off of the preglow relay and measure from each pin (they are numbered 1-6 same as the glow plugs) to engine ground. The reading of each glow plug should be about 0.5 Ohm more than the shorted reading but no more than 1.0 Ohm more. A bad glow plug will read several hundred Ohms up to infinity.

MB300D81 · #24 11-23-2010, 07:20 PM

Quote:

Originally Posted by Jeremy5848

Intake manifold removal procedure varies depending on whether you have an NA or turbo engine but in any case is not difficult and gives you an opportunity to clean up the top of the engine. I have replaced only two glow plugs in my '96; one took a little working in and out before it came free but the other one unscrewed with very little effort. I used anti-seize on the threads of the new glow plugs.

Thanks Jeremy,

I am sure I can get this job done. My E300 is turbo charged.

I feel that I am not expereinced enough in using the DVM to test the GPs.

Hopefully Kartek can advise on this one.

Thanks a lot for all the help.

MB300D81 · #25 11-23-2010, 07:21 PM

Quote:

Originally Posted by Jeremy5848

Use the 200 Ohm setting and short the leads, note the reading (should be close to zero). Then pull the six-pin connector off of the preglow relay and measure from each pin (they are numbered 1-6 same as the glow plugs) to engine ground. The reading of each glow plug should be about 0.5 Ohm more than the shorted reading but no more than 1.0 Ohm more. A bad glow plug will read several hundred Ohms up to infinity.

I see, I will go and do that and report back.

Thanks heaps.

KarTek · #26 11-23-2010, 08:03 PM

Yeah, use the 200 ohm setting at the 6 o'clock position on your selector. Some DVM's also have a separate port for the red lead when you're doing ohm testing. (mine does)

Black lead in the "COM" port and the red lead in the "OHM" port if there's a choice.

If you post a picture of the connectors on the meter, I can verify you're in the right ones.

MB300D81 · #27 11-24-2010, 03:57 AM

Quote:

Originally Posted by KarTek

Yeah, use the 200 ohm setting at the 6 o'clock position on your selector. Some DVM's also have a separate port for the red lead when you're doing ohm testing. (mine does)

Black lead in the "COM" port and the red lead in the "OHM" port if there's a choice.

If you post a picture of the connectors on the meter, I can verify you're in the right ones.

Ok, Setting the selector on 6 O'clock position.

1 reading 1____ .0
2 reading 0.9
3 reading 171.5
4 reading 1____ .0
5 reading 0.8
6 reading 0.9

Not very good news.

It is a little hard to get these GPs in Australia since only a handfull of these cars that made it to down under. However all other parts for the W210 is available.

I will try to get the GPs first before taking things apart.
Lucky it is summer time over here.

Where do you guys get your GPS? Any advise please?

Thanks a million

spark3542 · #28 11-24-2010, 09:03 AM

Looks like GPs number 1,3, 4 are all bad.

The intake manifold ends up being fairly painless to remove on the NA version, not sure about the turbo.

3 simple rules have had successful results in changing w210 glow plugs
1) Warm engine
2) Lots of PB Blaster
3) Use a torque wrench to remove and don't go over 50 Nm

If the plugs don't budge at 50Nm, spray with more PB Blaster, walk away, enjoy a beverage for 30 or 60 mintues and go back and try again. Repeat as needed, but be careful on how many beverages you have.

I buy my GPs online.

MB300D81 · #29 11-24-2010, 05:32 PM

Yeah Mark, I will not rush at all.

I already have a W124 300D so I will not be without a car while doing this job.

Does anyone have an on line link to where to order the plugs please?

Cheers

KarTek · #30 11-24-2010, 06:06 PM

Try the links above first. I'm not sure they sell internationally though. If not, Rock Auto will ship them to you for about $30 AU.

I'm not sure where you're located but I did a shipping estimate to Vic and that's what it came up with.