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  #1  
Old 03-22-2002, 02:39 AM
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Join Date: May 1999
Location: Sacramento, CA
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300e intermittant no hot start

About four times in the last six months, our 87 300E has intermittantly refused to start when hot. The engine cranks, but doesn't catch. It never seems to do it with any consistancy - once after sitting for about an hour and a half, took about 15 min of intermittant cranking to start. Another time, the car sat for about 1 minute, and took about a minute of cranking to start.

From searching previous posts, I suspect that it may be a fuel pressure leakdown, resulting in vapor lock, but i don't understand why it only seems to happen occasionally, and never after the car sits for the same length of time (granted, my diagnostic abilities are somewhat green)...

thanks,
anthony
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  #2  
Old 03-22-2002, 01:45 PM
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Join Date: Sep 2001
Location: Houston, Texas
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Had the same problem. It turned out to be the fuel pump relay. When it wont start see if you can hear the fuel pump running. If not, check the fuel pump relay.
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  #3  
Old 09-15-2002, 08:01 PM
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Thanks Dave,

Turns out it was the relay. After replacing it, haven't had a problem with starts in the five months the new part's been in the car.
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  #4  
Old 09-15-2002, 09:05 PM
wotan
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I have the same problem

Thanks for this post. My 190E has been doing that when the engine is hot after long drives.

I will check both. BTW, what does the OVP look like next to the battery?
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  #5  
Old 09-16-2002, 05:07 PM
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The OVP should be a red-topped relay with a plastic flip-up cap. Underneath the cap is a fuse. It's on the far right, behind the battery. The relay can be a pain to pull out of the socket...

-anthony
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  #6  
Old 09-16-2002, 11:14 PM
wotan
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Still can't find it on my 1993 190E 2.6

Could it be that it is inside the fuse box to the far left on the driver side?
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  #7  
Old 09-16-2002, 11:57 PM
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You need to pull the black plastic panel behind the battery on the pass. side of the engine bay to expose the relay bank. It can be a little tricky working it out from under the hood. Then the relay is to the right of all the other relays, set back a little bit.

-anthony
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  #8  
Old 09-17-2002, 12:02 AM
wotan
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Thanks! I will check it out.

ok.
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