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  #1  
Old 07-19-2010, 05:35 PM
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Location: Napa Ca
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89 300sel 3.0 six

My car is hard starting after it sits overnight....crank crank crank... Did a compression test
150
160
150
145
140
150

I have had overheating issues and was concerned with head gasket issue...no oil/water mix.

What should I expect my compression to be from a 175K engine?
Thanks
Warren

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  #2  
Old 07-19-2010, 06:19 PM
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That seems pretty good for that many miles, without giving you a specific answer. On a new one you'd expect 200ish, so you are pretty good.

One suggection, given the symptom, is to check the OVP fuse. You can do a search on it. If it starts hard and runs kinda poorly until it's warmed up, it would be worth a quick check of that fuse.
Gilly
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Old 07-19-2010, 08:06 PM
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thanks...should I do the "wet" test?
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Old 07-19-2010, 08:56 PM
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Up to you, hows the ovp fuse?
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  #5  
Old 07-19-2010, 09:44 PM
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checking it tomorrow Had a broken plug wire...the wire slipped out of the ceramic housing.. A ***** to get back on..if I can at all!!!
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  #6  
Old 07-20-2010, 10:10 PM
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I changed plugs, removed ovp, checked fuse, cleaned connectors, repaired broken plug wire...crossed fingers...and it started right up!! Runs fine...we will see.

Thanks
Warren
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Old 07-21-2010, 07:49 AM
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Quote:
Originally Posted by wrnmnro View Post
I changed plugs, removed ovp, checked fuse, cleaned connectors, repaired broken plug wire...crossed fingers...and it started right up!! Runs fine...we will see.
Runs fine without an OVP?
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1988 California version 260E (W124)
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Past Mercedes-Benz:
1986 190E Baby Benz
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Old 07-21-2010, 09:27 AM
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I cleaned it up and put it back in...don't know if it was the problem because I was doing a number of other things too. But it is starting great. Will keep an eye on it and buy a spare.

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