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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Ecu wet car would not start. Where does water come from?
Hi guys car would not start I traced it to the ECU on passenger side near front sam
Where does water usually come from?
Thanks
Erick
2002 G500 |
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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: Ecu wet car would not start. Where does water come from?
Ertech - 2/4/2018 7:47 PM
Hi guys car would not start I traced it to the ECU on passenger side near front sam
Where does water usually come from?
Thanks
Erick
2002 G500
Not sure where the mentioned front sam is locacted.
1.) Loose or leaking windshield wiper bushings.
2.) Plugged or broken drain tubes from the sun roof. |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| RE: Ecu wet car would not start. Where does water come from?
here it is
 (w463-fuse-box-front-sam-N10-1.jpg)
 (IMG_1059.jpg)
Attachments
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 w463-fuse-box-front-sam-N10-1.jpg (25KB - 1 downloads)
IMG_1059.jpg (65KB - 2 downloads)
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: Ecu wet car would not start. Where does water come from?
If you have the little antenna between the sunroof and windshield, that is a common leak point. That thing is useless now anyway. Replace it with a plastic plug and sealant.
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Ecu wet car would not start. Where does water come from?
I welded that shut when I painted the truck |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| Re: Ecu wet car would not start. Where does water come from?
Spray water at the windshield wiper shaft. I'm guessing that is the entry point. The wipers may need to be moving to let the water in. The sliding roof drains are a distant second chance. Easy to test and clean though.
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H1LM002G55
Expert
Date registered: Mar 2010
Location: S Florida / Geneva / Jeddah
Vehicle(s): 500 GE, G55, LM002, H1
Posts: 1796
| Re: Ecu wet car would not start. Where does water come from?
Tell us more about the sliding roof drains and how to check for any issues here, please. |
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Titus Pullo
Elite Veteran
Date registered: May 2007
Location: Ottawa, ON, Canada
Vehicle(s): '90 Wolf 240GD, '06 G270 CDI.
Posts: 1010
| Re: Ecu wet car would not start. Where does water come from?
Eric, it is most likely coming from the right wiper arm shaft. |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: Ecu wet car would not start. Where does water come from?
The sliding roof drains are near the four corners of the sliding roof. The actual tubes are ~10mm ID, and they go into the closest pillar. They can be probed (carefully - see below) with a really long ziptie. As far as flow testing, goes. Open the roof protect the interior and poke around with the ziptie until you find the opening. Then thread a narrow hose in there and run some water through. You will find out quickly if it is plugged. The tubes are a glued and friction fitted to the sliding roof tray. One failure mode is that the tube cracks and slips off. That allows water to come out into the headliner. Again that is pretty obvious. Removing the headliner to fix that is a real pain.
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Ecu wet car would not start. Where does water come from?
You guys are right wiper shaft since I put green grease in the caps and the water was like tinted with grease
The linkage is new i think I might have put the seal from on the outside
Does the seal go on the inside our outside?
Thanks |
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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: Ecu wet car would not start. Where does water come from?
AlanMcR - 2/5/2018 1:13 PM
The tubes are a glued and friction fitted to the sliding roof tray. One failure mode is that the tube cracks and slips off. That allows water to come out into the headliner. Again that is pretty obvious. Removing the headliner to fix that is a real pain.
Heinz did a repair and posted about it here with photos. |
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Ertech
Veteran
Date registered: May 2016
Location: Montreal CA
Vehicle(s): 2011 G550
Posts: 156
| Re: Ecu wet car would not start. Where does water come from?
what seal do you guys use for wiper pivot since you can't only but it separately from MB.
thanks |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| Re: Ecu wet car would not start. Where does water come from?
At the wiper shaft there appear to be two types of leaks. 1) where the fixed sleeve is attached to the body. Loosen that and seal it. Preferably with a non-hardening sealant that will prevent rust where the parts bite into the paint. 2) between the shaft and that sleeve. This should really not be a leakage area if the outer plastic sleeve is in place. I "invested about $2.50/ea in these at the dealer 12 years ago. Still going strong. While I had it acessible I worked thick grease into the shaft/sleeve interface.
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 464
| Re: Ecu wet car would not start. Where does water come from?
Hi gents
Although the OP's leak point..from the right wiper shaft, above the ECU is the cause here..and the sunroof drain tubes where mentioned
I would like to add more to the issue of "blocked drain tubes".
I've never had a blocked tube issue but I did notice with every car washing, the water would drip out from behind the black exterior pillar trim's..hours after the washing.
Decided to remove the trim and investigate..close to a third of the pillar was filled with leaves/dirt=compost!
I was expecting to find rust under all the crud, to my surprise...none!
If anyone's inclined to remove the compost..the trim is held in place with three or four small S.S.rivets, easily seen with the front doors open.
Carefully drill off the rivet heads, make sure you've reached the rivet shaft diameter..keep in mind, you'll be pushing them thru painted holes in the body? Use a drift with a smaller diameter than the rivet shaft and tap it thru. The rivets are 1/2" long..need to carefully drive them almost all the way thru to free the trim.
I would locate new Black S.S. rivets of the same diameter and length first..and because I can not remember if the rivets where 1/2" or 3/4"..buy both sizes. During assembly, apply a small amount of silicon..where the rivets meet painted holes.
Enjoy! |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| Re: Ecu wet car would not start. Where does water come from?
An alternative to rivets is to use black caulk to glue it on. It won't come off on its own, but can be pulled off with some effort. So far the cover has taken several branch hits with no sign of loosening.
Edited by AlanMcR 2/7/2018 1:19 PM
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