Another GP question - PeachParts Mercedes-Benz Forum

andmoon · #1 09-26-2006, 09:41 AM

Gp light doesn't come on until 10 seconds after the engine has started...then stays on for 45 ~60 seconds.

I have read mucho threads under GP search and got tired and lazy

...sorry but may I pls. stop searching on this one?

Lostyankee · #2 09-26-2006, 10:03 AM

Look at Diesel Giant (web site) and do the GP & relay check. Then post results.

sailor15015 · #3 09-26-2006, 11:23 AM

How does your car start? Any stumbling or anything to indicate bad plugs?

andmoon · #4 09-26-2006, 02:41 PM

She starts w/ a click of the starter. I waited ~20 seconds even though the GP light didn't come on. Rough for 10 secs and then ran normal...It was 55F this morning.

andmoon · #5 09-29-2006, 11:07 AM

My GP relay tested fine via diesel giant method but my relay doesn't have the strip fuse. 90sdl....what gives?
GP 1 & 2 under .5 oms
3, 4 and 5 gave me .03...is this posible?...not infinite but almost zero...are these bad plugs?
6 .6

Thanks,
Don

rocketman93116 · #6 09-29-2006, 11:12 AM

this must be on the 90 SDL, they don't have the strip fuse in the glow plug relay. I vote for shorted/ GP relay caused by faulty gp plugs, replace the set and gp relay.

andmoon · #7 09-29-2006, 11:26 AM

Quote:

Originally Posted by rocketman93116

this must be on the 90 SDL, they don't have the strip fuse in the glow plug relay. I vote for shorted/ GP relay caused by faulty gp plugs, replace the set and gp relay.

I get battery voltage to the relay when the key is turned....Can this still be a bad relay?
My concern is the close to zero ohm reading on 3 plugs...It says less than .5ohm is good. 0 is less than .5 but is that posible?

rrgrassi · #8 09-29-2006, 11:41 AM

Power to the relay is good, but does not rule out a bad relay. Is there power after the relay? Check that by checking voltage at the GP

andmoon · #9 09-29-2006, 11:45 AM

Yes power to relay...always.
Power out when key is turned to all 6 prongs.

rocketman93116 · #10 09-29-2006, 12:12 PM

check here for testing procedure and specs

http://mb.braingears.com/

rrgrassi · #11 09-29-2006, 12:13 PM

If you are getting the full 12 volts to the GP's then your relay should be good. Does this problem happen all the time, or when hot or cold starting?

Could be one or two GP's getting questionable, especially since you say the car idles rough for ten seconds or so after sitting overnight.

andmoon · #12 09-29-2006, 12:16 PM

Quote:

Originally Posted by rrgrassi

If you are getting the full 12 volts to the GP's then your relay should be good. Does this problem happen all the time, or when hot or cold starting?

Could be one or two GP's getting questionable, especially since you say the car idles rough for ten seconds or so after sitting overnight.

Happens all the time.
What is strange is that the gp light comes on after the engine is started and stays on for 45~60 seconds.

rrgrassi · #13 09-29-2006, 12:29 PM

Since I own a 617, I was wondering if the KLIMA relay can have anything to do with this...

rocketman93116 · #14 09-29-2006, 12:54 PM

Read this thread focusing on the GP issues, I doubt the KLIMA has any thing to do with the problem.

http://www.peachparts.com/shopforum/showthread.php?t=165294&page=3