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  #1  
Old 11-26-2006, 08:16 AM
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Posts: 3
Cold start problem (1989 190E)

I've got a 1989 190E 2.6 that has trouble starting when cold. It just cranks and cranks but never starts. I can spray starting fluid in the throttle body and it'll start right up (and start fine every time after that until it cools off again). I've replaced the OVP relay (and the fuses on top). I'm measuring about 4v at the cold start injector during cranking. If I remember right I should be getting the full 12v, right? Any ideas where to look next?

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  #2  
Old 11-28-2006, 11:31 PM
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Any thoughts are welcome...
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  #3  
Old 11-29-2006, 08:06 AM
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
Check the coolant temperature sensor.

Ohm's range from the temp chart in the /Engine Manual-Combustion Manual-07.3 Mechanical/electronic gasoline injection system (KE injection)-121 Testing electrical components of KE injection system. page 60

Temperature °C........Resistance k?
-20........................15.7
-10.........................9.2
0............................5.9
10...........................3.7
20...........................2.5
30...........................1.7
40...........................1.18
50...........................0.84
60...........................0.60
70...........................0.435
80...........................0.325
90...........................0.247
Same resistance values apply to KE intake air temp sensor.
I think this chart applies to these 2 sensors for all KE systems but don't know for sure.
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-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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  #4  
Old 11-29-2006, 10:16 PM
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Thanks. I'll check it out. Can you point me in the right direction? Doesn't this engine have multiple coolant temp sending units? Thanks again!
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  #5  
Old 11-30-2006, 08:06 AM
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
The one that affects cold start fuel injection is on top of the block near the back of the sensor aray:
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1WU0I65ZV1YG0H9SHG&year=1989&make=MB&model=300-E-002&category=C&part=Water+Temp.+Sensor&appEngines=_any
__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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  #6  
Old 04-01-2007, 11:50 AM
Russian MB tech, hmmm....
 
Join Date: Mar 2007
Location: Greenville, NC
Posts: 15
I'm having the same problem at the moment. Have swapped fuel pump relay, coolant temp sensor, air intake temp sensor and ecm with running car. No dice. Fuel pressure ok, no voltage at cold start valve on cold start. Haven't been able to find the OVP relay on this car, I'm mildly worried about that. I have pics, and a reference car to go by. Mine is MIA. Hmmm.

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