unique glow plug problem? - PeachParts Mercedes-Benz Forum

Palangi · #1 12-16-2006, 12:31 PM

Quote:

Originally Posted by t walgamuth

what brand of glows did you use?

if not bosch then i suggest just getting bosch and replacing all of them. this is one place where the brand matters.

bosch is best, imho

tom w

I agree with Tom. This sounds like Autolite or some other mystery brand of glow plugs. Get a set of the proper Bosch plugs and this problem will be gone.

bill.schweig · #2 12-16-2006, 01:52 PM

Quote:

Originally Posted by Palangi

I agree with Tom. This sounds like Autolite or some other mystery brand of glow plugs. Get a set of the proper Bosch plugs and this problem will be gone.

i used bosch. replaced all 5. i usually glow twice when it feels chilly out, just to make it easier on the starter. i haven't been running WVO for a couple weeks b/c i have been out.

i did not ream the GP chamber before replacing them. please elaborate.

would not doing this cause the GP light to flash on and off. it has done this flashing beofre but replacing the GPs made it function normally.

whunter · #3 12-16-2006, 04:06 PM

Quote:

Originally Posted by bill.schweig

I did not ream the GP chamber before replacing them. please elaborate.

Here are some links to help you.

Glow plugs link thread
http://www.peachparts.com/shopforum/showthread.php?p=1019018

Have a great day.

leathermang · #4 12-16-2006, 04:11 PM

Don't glow twice. Turn your glow plugs on and time it for one minute.. the FSM says it continues to get hot if you just leave it on even after the light goes out...

Jadavis · #5 12-16-2006, 07:21 PM

Quote:

Originally Posted by leathermang

Don't glow twice. Turn your glow plugs on and time it for one minute.. the FSM says it continues to get hot if you just leave it on even after the light goes out...

Depends on the model/year.

My 87 300D will go for about 36 seconds. If it is really quiet you can hear the relay click off. Another way to check is to watch your dome light. It will brighten up when the relay kicks off.

-Jim

leathermang · #6 12-16-2006, 11:08 PM

Quote:

Originally Posted by Jadavis

Depends on the model/year.

My 87 300D will go for about 36 seconds. If it is really quiet you can hear the relay click off. Another way to check is to watch your dome light. It will brighten up when the relay kicks off.

-Jim

This is an answer in a thread about a 1980 vehicle....
but those are ways to see how long your plugs are drawing current...
The advice about leaving it on...as compared to ' glowing it twice' is still good since many people don't realize it is suggested in the FSM...

whunter · #7 12-16-2006, 07:33 PM

Here are some links to help you.

bill.schweig · #8 12-16-2006, 07:54 PM

i read thru most of those links yetserday and the restg just a minute ago. i'm realizing that i may have tested the wires wrong. i need to know which socket in that 8 socket head leads to which GP and what the extras are there for would be helpful too. any info?

also any idea on why i got readings the way i did?

864Lightning · #9 12-16-2006, 09:41 PM

Quote:

Originally Posted by bill.schweig

i read thru most of those links yetserday and the restg just a minute ago. i'm realizing that i may have tested the wires wrong. i need to know which socket in that 8 socket head leads to which GP and what the extras are there for would be helpful too. any info?

also any idea on why i got readings the way i did?

As to which socket in the harness plug goes to which glowplug,, If you look down into the holes of the plug,, starting at the bottom where the wires come in,, on the right side row going counter clockwise
1,2,3,4,5 go to the plugs,, 6 is blank and 7,8 go to two sensors on the engine.. This is the way I remember it from last weekend... Also check the tightness of the 8MM nuts on each plug before doing any tests.. I found two of mine a little loose before I started doing my testing.

bill.schweig · #10 12-16-2006, 10:37 PM

Quote:

Originally Posted by 864Lightning

As to which socket in the harness plug goes to which glowplug,, If you look down into the holes of the plug,, starting at the bottom where the wires come in,, on the right side row going counter clockwise
1,2,3,4,5 go to the plugs,, 6 is blank and 7,8 go to two sensors on the engine.. This is the way I remember it from last weekend... Also check the tightness of the 8MM nuts on each plug before doing any tests.. I found two of mine a little loose before I started doing my testing.

well, im hoping that 7 and 8, since they drew 5.6 and 7.1 volts are to the sensors. my #4 is blank - just a difference in model years? so that means 1,2,3,5,6 are my GP connectors.

so each pin except the sensor pins are testing the same as battery voltage, and #1 and #6 holes still test open for resistance.
does that mean no problem with the relay and the problem is wiring between the large connector and the GPs since the GPs themselves are new?

by the way, thank you all so much for the incredible help! having little $ to my name and relatively little mechanical knowledge, fixing my car with your help is the only way i'll be able to visit family for the hoplidays...