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osky1976
Member
Date registered: Oct 2016
Location: Kansas
Vehicle(s): 1990 Mercedes 250GD W460 LWB
Posts: 39
| W460 250GD takes a while to warm up
Hello Everyone need some advice,
Let me start off with some background information, so since I bought my G wagon, I have been doing a tune up. I have so far completed an oil change, power steering oil change with filter, front and rear differential change, transmission oil change, transfer case oil change. This week I will knock out a fuel filter and inline fuel filter change along with running a diesel purge to clean the injectors.
I still have/want to:
change glow plugs , (ream and glow plug conversion)
coolant change / t-stat replace
brakes F&R
replace all tie rod joints ( all are bad)
grease all lube points and refill front grease universal ball joints
I'm hoping after I run a diesel purge this weekend along with changing the fuel filters my G will warm up faster than taking around 7 to 8 min for warm up. I'm unsure if the diesel purge might help. I don't know, what do you think. Any information would be greatly appreciated or could this be the normal warm up time for my 1990 250GD?
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: W460 250GD takes a while to warm up
osky1976 - 12/23/2016 1:40 AM
I'm hoping after I run a diesel purge this weekend along with changing the fuel filters my G will warm up faster than taking around 7 to 8 min for warm up. I'm unsure if the diesel purge might help. I don't know, what do you think. Any information would be greatly appreciated or could this be the normal warm up time for my 1990 250GD?
I can't speak directly to your engine, but all four of my common rail diesels (2007 MB ML 320CDI, 2010 Audi Q7 3.0 TDI, 2014 MB ML 350BTC and 2015 Audi Q7 3.0 TDI) were slow to warm up compared to gasoline engines. This in spite of the Audis supposedly having supplemental engine heaters in place on the engines. |
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osky1976
Member
Date registered: Oct 2016
Location: Kansas
Vehicle(s): 1990 Mercedes 250GD W460 LWB
Posts: 39
| Re: W460 250GD takes a while to warm up
When I mean to warm up, I mean to give it very little gas to keep it from staling out as if I'm applying a little gas to act as a choke. After five plus minutes its ok to release the minimal pressure I have on the gas pedal. |
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w.james
Veteran
Date registered: Jun 2006
Location: New Jersey
Vehicle(s): 84 280 GE 617A 5sp getrag
Posts: 239
| Re: W460 250GD takes a while to warm up
Think that the fuel filters will help |
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bram_r
Expert
Date registered: Apr 2007
Location: the Netherlands
Vehicle(s): 1984 MB 280GE, 1982 MB 300GD, 1986 Subaru XT 4WD
Posts: 1659
| Re: W460 250GD takes a while to warm up
Don't you have that turning knob on the dash like the 240GD and 300GD have? Then you can increase your idle during warm up.
More info here:
http://pointedthree.com/disc/forums/showthread.php?tid=7576&posts=3...
gr. Bram |
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Johnny Christensen
Veteran
Date registered: Sep 2010
Location: Denmark
Vehicle(s): GD290 W461
Posts: 202
| Re: W460 250GD takes a while to warm up
osky1976 - 12/23/2016 2:29 PM
When I mean to warm up, I mean to give it very little gas to keep it from staling out as if I'm applying a little gas to act as a choke. After five plus minutes its ok to release the minimal pressure I have on the gas pedal.
Sounds like your thermovalve in the head, may not be doing it's job or one of the connecting hoses are leaking.
At temperatures under 30C it is to allow vacuum thru, to act on the high idle adjuster that is located at the rear of your injectionpump. It raises your idle by about 150 rpm.
When 30C has been reached, it shuts off and vacuum disappears thru a bleeder valve. Idle will now return to normal, ~800 rpm.
To test the idle adjuster, try connecting a vacuum hose straight on.
Trace the small diameter hose that comes of your vacuum pump in the front of the engine. Downstream from that is where you will find everything needed.
It's a 30 minutes and 3 - 20 USD job. Not much will go wrong with this fuelsystem. |
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osky1976
Member
Date registered: Oct 2016
Location: Kansas
Vehicle(s): 1990 Mercedes 250GD W460 LWB
Posts: 39
| Re: W460 250GD takes a while to warm up
no, there is no knob to adjust the idle to help from staling out. |
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osky1976
Member
Date registered: Oct 2016
Location: Kansas
Vehicle(s): 1990 Mercedes 250GD W460 LWB
Posts: 39
| Re: W460 250GD takes a while to warm up
I'm looking into the idle controller valve on my G, but I have no idea where it's hiding at. Can someone help me out and describe where it's located at. I have a 1990 W460 250GD
Thanks
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Johnny Christensen
Veteran
Date registered: Sep 2010
Location: Denmark
Vehicle(s): GD290 W461
Posts: 202
| Re: W460 250GD takes a while to warm up
Please see Mercedes PDF.
Check for leaking vacuum lines first. It typically happens where they are pushed onto the vacuum pump, thermovalve or at the rear of the injection pump.
Attachments
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 Idle increase by vacuum.pdf (404KB - 14 downloads)
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osky1976
Member
Date registered: Oct 2016
Location: Kansas
Vehicle(s): 1990 Mercedes 250GD W460 LWB
Posts: 39
| Re: W460 250GD takes a while to warm up
much appreciated Johnny. |
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BlueG
Elite Veteran
Date registered: Aug 2009
Location: DC
Vehicle(s): 2003 G500
Posts: 714
| Re: W460 250GD takes a while to warm up
On my (non-benz) diesels it is important to have fresh fuel filters and more importantly the valves in adjustment. Not sure if you have done a basic tune up in that regard but the difference can be massive. |
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Johnny Christensen
Veteran
Date registered: Sep 2010
Location: Denmark
Vehicle(s): GD290 W461
Posts: 202
| Re: W460 250GD takes a while to warm up
BlueG - 2/2/2017 7:49 PM
On my (non-benz) diesels it is important to have fresh fuel filters and more importantly the valves in adjustment. Not sure if you have done a basic tune up in that regard but the difference can be massive.
Always have fresh filters, but the OM602 engine have hydraulic valve adjusters. |
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Inkblotz
Expert
Date registered: Apr 2006
Location: Georgia
Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo
Posts: 3186
| RE: W460 250GD takes a while to warm up
On the top back half of the injection pump there is a manual idle screw with a lock nut. Though the Red ELR on the back of the pump should control the idle a manual adjustment to bring the idle up a bit is fine.
Mark
 (Screen Shot 2017-02-03 at 6.41.49 AM.png)
Attachments
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Screen Shot 2017-02-03 at 6.41.49 AM.png (485KB - 1 downloads)
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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| Re: W460 250GD takes a while to warm up
Does it not have an electrical controlled idle speed like the OM603 ? I see the electrical terminal on the top. If this fails idle speed defaults to a very low an dis determined by internal mechanical governor - when hot its ok but cold idee speed will be too low. The controllers often fail - when cold pull electrical connection out - if no speed change then controller or actuator is faulty |
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osky1976
Member
Date registered: Oct 2016
Location: Kansas
Vehicle(s): 1990 Mercedes 250GD W460 LWB
Posts: 39
| Re: W460 250GD takes a while to warm up
I figured it out! I tried everything but nothing seem to fix the idle issue until I was replacing fuel lines that run from glow plug to glow plug. I was moving things around, and noticed the accelerator cable plastic adjusting screw was broke. I replaced it with a new OEM cable and now no more very low idling issues in the morning. Runs like a Champ. I love my G wagon! |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| Re: W460 250GD takes a while to warm up
osky1976 - 4/29/2017 8:35 AM
I figured it out! I tried everything but nothing seem to fix the idle issue until I was replacing fuel lines that run from glow plug to glow plug. I was moving things around, and noticed the accelerator cable plastic adjusting screw was broke. I replaced it with a new OEM cable and now no more very low idling issues in the morning. Runs like a Champ. I love my G wagon!
Thanks for the followup with your solution to the problem. Wouldn't it be nice if everyone did this. Thanks! |
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