invisik,

Polarity of the ohmeter doesn't matter. You are measuring pure DC resistance not a solid state device such as a diode or transistor.

The readings you got are odd, though. The way you connected the ohmeter, some of the readings should have been reading 2 GP in series so should have been about 1 to 1.5 ohms. Maybe you do have some open GP and that would account for the readings you got.

P E H

alldata says it's a B level ability job, 3.6 hours . even at 40/hr that's 140 bucks plus parts $85 for plugs, $15 for two gaskets.

__________________
71 220D 169K wrecked
83 240D 118K sweet 4 speed
91 350SDL (one of the 60% good engines) 156K
84 300d (loaner to my sister) 189K
79 300SD (partswagen)
86 420SEL partswagen
70 220d (partswagen)
68 280s GASSER!!! under construction now
85 300sd 310K miles winter beater car retired
93 300d 2.5 turbo 168K wife's car
83 280SL euro 5 speed 155K
69 250S newest project 54K

fj,

Thanks for that information. If I do end up taking it somewhere, I have some ammo on the price.



The car is back, I will let it cool a bit and dig back into it.

Thanks.

-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

Ok, here's the new results. I planted the black probe on the negative batter terminal and used the red to probe the plug.

1 0.5
2 OL
3 0.6
4 0.6
5 OL

I couldn't find a stable ground closer to the plug. It would give me number of like 83 and stuff like that, which I don't think was right.

Thanks again for the help. Are my 2 and 5 plugs shot?

-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

Yes, this tends to indicate plugs 2 and 5 are not working. If they have an open circuit like that they won't heat.

It is also consistent with your glow plug dash indicator operation that you have two (and not just one) plugs bad.

Only other thing I can think of to check before going further is to make sure the wires are OK and hooked up to those plugs - not likely to be a problem, but worth a visual check.

Ken300D

__________________
--------------------------
1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

So I could focus on those plugs at least for now. If I do end up taking the intake manifold off, I will just do them all (I already have the parts).

Are the plugs 1 through 5 from the front of the engine to the back or are they mixed up?

Thanks again!

-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

invisik,

Yes, I would say GP 2 and 5 are bad. The last readings would also agree with the first readings you posted when you were reading 2 GP in series.

The GP are numbered from #1 to #5 from front to rear just like the cylinders but you have to check to see how the GP are connected to the connector holes. How many holes did the connector from the GP cable to the GP relay have in it. 617 style engines had connectors with 8 holes of which 5 were connected to the GP.

Refering to Bertrand's data, your shop must be charging you about $100 an hour which I consider outrageous. DIY, especially since you have the parts, where else can you make $100 an hour tax free? Just be careful any wires or vacuum lines are replaced correctly. Take some pictures before you start and as you are removing things and make notes of everything you remove, (nuts, bolts, wires. vacuum lines, parts, ETC) so everything is put back correctly. You will be proud when you are finished and be glad you haven't paid for the MB dealer's yacht.



P E H

Hey,

My glow plug connector has 6 positions, 5 that are used and one that is not. Each pin had a number by it, presumably the cylinder number.

Yeah, I remembered the sign at the shop saying $105/hr and anything over 15 years old $125/hr.

I'm nervous partially to my history on some larger jobs that haven't turned out so well, and to the fact that I don't have a backup car anymore. And now it's Sunday and we have Mom coming over this evening, I should probably wait until next weekend to start.

Any problem with starting the car on 3 cylinders for a few weeks? After you drive it a few blocks all 5 start to fire and it runs normally, but lots of smoke and shaking until then.

Thanks much. I also have to check to see if I have the correct tools, which I suspect I don't yet.

-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

Also, should I buy a glow plug reamer and do that?

Finally, what else should I do while all these parts are off the engine? I plan on cleaning the inside of the intake.

I'm very much a "while I'm in here, let do other stuff" mindset.

Thanks again. I think I will make it.

-m

PS: Anyone want a sound file of a 5 cyl diesel firing on 3 cylinders?

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

I very much recommend the glow plug reamer. Lots of information about using them in other threads here - try the search function for lots of reading material.

It makes the glow plugs easier to install and improves their effectiveness by removing surrounding carbon.

Ken300D

__________________
--------------------------
1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

invisic,

I would rev the engine until it runs on all the cylinders before moving the car. This will get the cylinders with the bad GP hot quicker and will increase the driveability of the car.

P E H

Ok, folks! Today is the big day. My schedule is cleared all day today and Sunday. The wife isn't going anywhere so I can use her car for parts/tools runs.

The car is drying from some engine degreasing and we'll be jumping into it shortly.... Standby for questions!

Thanks again for all the advice!

-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

Good luck.

__________________
'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate

On the throttle linkage, are you supposed to be able to take the ball and socket connections apart? I haven't yet, but something's got to give here...

Thanks.
-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

Invisik,

The throttle linkage ball joints will pop apart with force applied to them. You might have to use a screwdriver to pry and a vise grip to hold, to get them apart.

P E H