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  #1  
Old 05-19-2006, 04:50 PM
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Join Date: May 2006
Location: Florida
Posts: 8
w108 engine stalls

Hello everyone!

I am the proud Dad of a '72 280 SE 4.5. The car was given to me by my Godfather after being in storage for 9 years! We are having a bit of a problem in "weaking it up" .

Already cleaned the Gas tank!
Got new fuel pump and fuel filter!
Changed fuel hoses!
New spark plugs!

The car started fine, a bit rough at the begining and smoking like crazy! ran for a bit and then stopped and would not start! Looked at spark plugs and the were black and dirty! Change for new set and started again fine. Even decided to get gas and put more air in tires. At the gas station after putting gas it stopped and would not start again.
I looked at the spark plugs again and they were not as dirty as the first but still black and kind of smell like gas!
Any ideas what to do next to clean all that stuff??
Any help and advice would be great.
Car has only 65 000 miles (two owners) only it has been sitting since 1997 at my god father's warehouse!

Thanks!

Tex
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  #2  
Old 05-19-2006, 05:05 PM
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Location: near Scranton, PA
Posts: 5,080
I don't see any "Replaced rubber vacuum line to the MAP sensor" - and believe me, this is VERY important if it was sitting for 9 years, chances are the hose on it now is completely full of holes. It will make your engine run EXTREMELY rich! Replace the hose to the MAP sensor. It sits on the firewall about center. You can see it in this pic, it's got the 2 blue stickers on it:
http://www.peachparts.com/shopforum/attachments/vintage-mercedes/18503d1085103143-picture-request-dscf0121-.jpg

Also, see all those blue metal lines on the pic (yours won't be blue) - you want to make sure ALL of them have good rubber. If ANY of them have cracked rubber your mixture will be WAY off, especially idle!

All the vacuum sources are incredibly important to make sure they don't leak. Also, the injector seals and manifold seals can leak too. A leak anywhere in the system may make your engine run so rich it stalls and floods automatically. If you DO flood, to help unflood it, unplug the trigger point harness from the distributor - labeled #5 on this pic:
http://www.peachparts.com/shopforum/attachments/vintage-mercedes/25593d1114212845-4-5-distributor-modifications-dizzy1.jpg

Then crank it for about 5-10 seconds. It may fire a bit. Then plug it back in.
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  #3  
Old 06-06-2006, 08:33 AM
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Join Date: May 2006
Location: Florida
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Thanks Tomguy!

Sorry it took so long to respond back (away on buss. trip) I had already changed all the rubber in the areas you tell me, but had not looked at the for the MAP sensor! I actually left the car with a mechanic before I left and just got back yesterday and have not checked on it yet. I did recieve a voice mail from him telling he was changing 2 fuel pressure regulators.
I will let you know how it is!

Thanks again!
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  #4  
Old 06-06-2006, 11:10 AM
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Join Date: Nov 2004
Location: Dallas, TX
Posts: 4,961
dirty plugs

If the car is running rich, you may find that there could be a lot of gas in the oil. This will make the car run like crap until you drain the oil and refill.

More importantly you need to determine why it's running rich. As I understand it (Tomguy may confirm), the computer controls the idle and the map sensor controls the running mixture.
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  #5  
Old 06-06-2006, 01:55 PM
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Well, the computer controls it all, but if you mean the mixture setting on the ECU, it only controls the idle mixture. And even then, ANY adjustment on the MAP will still change the idle mixture too.

Don't worry about touching the mixture adjustments yet. Make sure you are 100% leak free before you do. Remember, if it ran properly when parked, it'll probably run properly once you get all the leaks fixed without adjusting anything.

And I believe those regulators have rubber diaphraghms, so yeah, if they were dry/gummed from stale gas, I could imagine you not having the correct fuel pressure and that's really bad. The EFI lines are all VERY high pressure (31 PSI) so if ANY line is dryrotted at all, it can easily burst and cause a major fire.

Let us know how she comes back!
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  #6  
Old 06-06-2006, 02:16 PM
John Holmes III
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I would make sure the ignition system is 100% before adjusting anything on the fuel injection. These cars need a healthy spark to run well, or at all. Weak spark can make the plugs turn black and foul, making the car very hard to start.
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  #7  
Old 06-07-2006, 11:34 PM
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Tomguy,
What is the ID of the rubber vacuum line to the MAP. It just has the one line, right? I don't want to pull mine off til I get one to replace it.
Thanks
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  #8  
Old 06-08-2006, 01:29 AM
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5/16" ID EFI line should work fine - same ID as what the injectors and the fuel rails use.
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Current:
2018 Chrysler Pacifica Limited
1999 Chrysler 300M - 211,xxx

My Mercedes Benz 108 and 109 resource site

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
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