w114 280ce still sorting out - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 02-20-2007, 01:48 PM Thread Starter
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w114 280ce still sorting out

hello!

I'm still working on sorting out my new purchase, however i'm at a stumbling block.

The fuel consumption was in the single figures with low power, and the CO% was 11%. I was frightened enough to send it to a merc specialist to solve this. They replaced the inlet manifold gasket and injector rubbers. And the result? 0.3%CO and same power. It starts easier from cold and drives a bit smother, but now misfires a little while driving for a couple of seconds and then is fine again! Ive had a look at a d-jet fault finding guide, but am still not any further! ideas?

The rest of the car is slowly getting there, only have to locate the source of a leak accumulating in the front footwells, but i'll get there! Thanks in advance for all the suggestions!
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post #2 of 6 (permalink) Old 02-20-2007, 06:17 PM
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You need the djet guide published for this car. It was section 7.4 in the M110 engine manual. An early, single volumn copy should have it.

The system is very similar to the 4.5, but with enough differences to warrent its own book.

Step 1 in fixing any fuel injection problem is to ensure that the ignition is perfect in every way as per the book. Has the timing been set at 4,500rpm and tested at 800, 1500 and 3500 RPM?

Step 2 is to make sure the line running to the manifold pressure sensor is both new and clamped to ensure that it's free of leaks.

Your front footwell leak is either the windshield seal or a hole in the firewall. Run the garden hose over the car and watch what happens.

-CTH
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post #3 of 6 (permalink) Old 02-21-2007, 01:02 AM Thread Starter
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The answers to your questions are not that i know of! Can you guess what i'm doing tonight?

The leak is a weekend job i think!

Thanks for some more pointers, i'll have a look for the book
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post #4 of 6 (permalink) Old 02-26-2007, 10:45 AM
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I have an M110 manual for sale if you're interested$30.

Mike
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post #5 of 6 (permalink) Old 03-02-2007, 08:17 PM
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Post D-Jetronic Fun

The D-Jet equipped cars are nice but you gotta do them one step at a time and in the correct order .

# 1 : (ALWAYS) is to do a valve adjust as they're always tight on every car I touch and this upsets the intake manifold pressure , that makes the M.A.P. sensor go wonky and can ruin it too .

Then the ignition timing and advance , often no one has ever pulled the rotor off the dizzy and dribbled a bit of engine oil in there so the advance mechanism sticks... gently turn the rotor and see that it moves and snaps right back . NO side play in the dizzy shaft is permissable ! . just a few drops of oil will do the trick , do this every couple months .

Then begin looking at the various vacuum hoses on the intake manifold , any leaks no matter how minor will upset the D-Jet .

The injector seals a very easy to change , two per injector and they're the same as old VW so cheap anywhere . they make vacuum leaks too .

Do the spark plugs have .035" gap ? never trust the pre gapping from the factory as the parts haus guys toss the boxes 'round .

Lastly , the T.P.S. is often dirty and this makes surging , usually very jerky in nature . get a spare one from the junkyard , take it apart and _polish_ the contacts untill glossy , NEVER use sand paper or steel wool ! .

You can also use a $5.00 oil pressure gauge connected to the cold start injector's hose to ensure the fuel pressure is 32# dead nuts and doesn't drop when you goose the throttle ~ if it drops , change the fuel filter (it's next to the fuel pump by the fuel tank and costs about $32.00) , clean the in tank screen and try again , the fuel pressure is adjustable but if it won't come up -or- the pump squeaks , it's dead , new $$ !! good used , very cheap , easy to clean before use by running Diesel fuel through it , polarity _reversed_ .

Running thid car out of fuel will kill the fuel pump in short order .

I hope this helps , D-Jet books are available new @ Auto Books for $30.00 and well worth the $ . used should be less , maybe Amazon.com ? .

You should easily be able to tweak it to 0.2 % CO and under 300 PPM HC , then your fuel milage should be better .

I'm in the market for a W-114 Coupe here in La-La Land..

-Nate

Quote:
Originally Posted by D_R_Payne
hello!

I'm still working on sorting out my new purchase, however i'm at a stumbling block.

The fuel consumption was in the single figures with low power, and the CO% was 11%. I was frightened enough to send it to a merc specialist to solve this. They replaced the inlet manifold gasket and injector rubbers. And the result? 0.3%CO and same power. It starts easier from cold and drives a bit smother, but now misfires a little while driving for a couple of seconds and then is fine again! Ive had a look at a d-jet fault finding guide, but am still not any further! ideas?

The rest of the car is slowly getting there, only have to locate the source of a leak accumulating in the front footwells, but i'll get there! Thanks in advance for all the suggestions!

-Nate
Old German cars & motos
vintage car mechanic
Gearhead
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post #6 of 6 (permalink) Old 03-04-2007, 02:52 PM Thread Starter
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Thanks for that! I've been busy sorting out bits and pieces the last few days.

replaced sunroof seals and treated some rust on the underside of the sunroof, also found 2 leaks. One from the drivers door chrome trim just infront of the quarter window, which was easily solved, the 2nd is from what I'm assuming is the drain from the fresh air box (just to the right of where the throttle linkage goes through the bulkhead). This isn't so easily fixed! I'm in the process of taking out the heater so i can have direst access to it.

I'm getting there! too bad it won't look any better for all this tinkering!!
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