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  #1  
Old 11-19-2013, 11:58 PM
davidlee's Avatar
davidlee
 
Join Date: Mar 2012
Location: Portland OR
Posts: 605
I need to bend someones ear about my car issues

3 weeks ago I was involved in a somewhat minor collision with my 87 300D, I was on the freeway on my way home after a long days work, in rush hour traffic and took my eyes off the road just long enough to look in my side mirror, preparing to move a lane over, when I looked forward again traffic was stopped 10 feet in front of me and i wasnt. I hit a mid 90's Mazda truck, not that hard but it doesnt take much with a MB, the truck didnt have a scratch, his rear bumper lined up perfectly with my headlights and grill, there was no other outside damage, ie. fenders, hood, bumper. they were untouched. but it bent my core support and pushed my radiator into something (thats all I knew at the time because i was loosing coolant and couldn't get the hood open) I was able to shut the car off almost immediately so I know the engine never overheated, the car was towed home, then I loaded it onto my car trailer and towed it to the body shop, once they got the hood open they called me down there because I told them I wanted to see the damage before it was pulled out, (I wanted to look to see if any engine parts might have been compromised ) what I saw was, the radiator was pushed back into the p/s pump a little bit, thats where the loss of coolant came from, and a fan blade was chipped, so I had them replace the fan blade and clutch, new radiator, good used A/C condenser and electric fan.
Backing up a little bit,, when I drove the car onto my car trailer to take it to the bodyshop I noticed the Idle was unusually low and the car was vibrating, but I figured it had to do with what ever was pushed into the radiator (remember I had not been able to open the hood yet at this point) but it still bothered me enough to tell the body shop to hold off on the new paint job until I here this thing run again ( the collision didn't cause the car to need a paint job, I have been wanting one for a while and figured Hell, its already there might as well have it done at the same time ) granted i only carry liability insurance so this whole thing is coming out of my pocket. So I told them I wanted to make sure this thing doesn't have engine issues before I fork out the cash for a paint job.
Fast forward back to the present, the car is all put back together the way it was pre accident, save for the 91 2.5T passenger side vented fender I have been saving for the past 2 years. this eve after work I ran down there to hear it run and nothing has changed, extremely low vibrating idle .
not sure how to explain it other than the feel of a bad OVP relay.
Once again no fuel lines oil cooler lines or any other lines where damaged in the accident, would a minor collision cause a OVP to go bad? its located at the fire wall, far away from any damage.
I didn't think about the OVP till I was on my way home or I would have checked the fuse and Or pulled it to see if there was a difference.
the car doesn't die and still revs up just fine. its just the idle that I have noticed, I have not actually drove it so I cant tell you if there is a loss of power.

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82 GMC Jimmy (K5) 6.2 Diesel (my Wheeler)
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  #2  
Old 11-20-2013, 12:27 AM
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Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,346
A low idle on the OM603 means the electronic idle control is not active. Likely OVP relay or an issue with power to the idle control.
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  #3  
Old 11-20-2013, 12:51 AM
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Location: Philadelphia, PA
Posts: 2,771
My bet's on OVP relay... I solved/fixed similar issue on older Diesel not too long ago. 87 300D too.
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  #4  
Old 11-20-2013, 01:48 PM
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davidlee
 
Join Date: Mar 2012
Location: Portland OR
Posts: 605
thanks for the responses, that does make me feel a little more at ease about this situation. i still want to here it run well again before i go forward with the paint.
once again thank you all. this forum had been so valuable to me i don't know what i would do with out this group, i probably wouldnt still own a diesel MB, for the simple fact i do most of the work myself because i can't afford shop prices.
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Live simply so others can simply live



07 E350 sport Wife's Daily
01 E320 sport My Daily
00 C230 Kompressor Our back up (new Arrival)

87 300D Turbo my Daily for 8 yrs. Selling to neighbor

82 GMC Jimmy (K5) 6.2 Diesel (my Wheeler)
73 Roadrunner 340ci My very first car, still own it
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  #5  
Old 11-20-2013, 07:57 PM
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davidlee
 
Join Date: Mar 2012
Location: Portland OR
Posts: 605
The OVP had a blown fuse, Idle problem fixed, now Im dealing will a coolant circulation issue, can seem to get the new fluid to flow, engine is running hot, rad. hoses are cold, overflow level wont drop.
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Live simply so others can simply live



07 E350 sport Wife's Daily
01 E320 sport My Daily
00 C230 Kompressor Our back up (new Arrival)

87 300D Turbo my Daily for 8 yrs. Selling to neighbor

82 GMC Jimmy (K5) 6.2 Diesel (my Wheeler)
73 Roadrunner 340ci My very first car, still own it
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  #6  
Old 11-21-2013, 09:33 AM
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Join Date: Feb 2013
Posts: 209
I don't know how applicable this is to your engine, but when I recently installed a lower rad hose heater on my 1978 300D I put the nose of the car up on ramps, pulled the lower hose off, drained coolant into a bucket, topped up fluid, started and ran the car still up till the thermo opened and I saw the coolant moving in the rad, lowered car, drove around, allowed car to cool, then topped up coolant with it on the ground.
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  #7  
Old 11-21-2013, 09:58 AM
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Join Date: Jan 2002
Posts: 18,355
Yeah, could be an airlock after new coolant was installed with radiator replacement. Also could be a stuck thermostat or maybe a bad waterpump.

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