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  #1  
Old 02-02-2012, 04:50 PM
wbski007
 
Join Date: Jan 2012
Location: Mary Esther, Fl
Posts: 17
no start on 92 300 CE

OK fella's here we go again, now my 92 won't start at all, if I give it a shot of either it starts but you have to keep it reved pretty high to keep it running, if you let off on gas it dies and won't start again untill you give it more either, I changed the fuel filter and checked the pumps and their both working, its getting fuel to the fuel control valve and past that to the injection pump, seems to have plenty of fuel pressure, even cracked the return line and its got pressure there too, I just cracked all the injection lines coming out of the pump to the injectors and none off them has any gas coming out so the gas must be just passing right through the pump, is there anything in the pump that could be bad, any ideas on whats going on or what it could be????

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  #2  
Old 02-02-2012, 05:03 PM
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Boy that's weird because the thing should run in fixed operating mode if nothing else if it has fuel. I would suggest first, take off the supply line into the fuel dizzy, and put the end into a container, turn the key to "on" and see if you get a shot of fuel, and go from there. If that is positive, then I'd almost have to say it's the dizzy itself, but it's pretty rare to get a hard failure of that. If you aren't getting any fuel that way, then I'd gues along the lines of the MAS or FPR. If it has a FPR you could try jumping the FPR, or you could also just try jumping power and ground to the pump.
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  #3  
Old 02-03-2012, 08:48 AM
wbski007
 
Join Date: Jan 2012
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What in Gods name is a fuel dizzy and where is it, I posted a photo of my IP in a newer thread.
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  #4  
Old 02-03-2012, 12:23 PM
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Fuel distributor. Easy to see, round thing with fuel lines going to injectors leading from it.

Rgds,
Chris W.
'95 E300D, 359K
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  #5  
Old 02-03-2012, 12:51 PM
wbski007
 
Join Date: Jan 2012
Location: Mary Esther, Fl
Posts: 17
I think the fuel dizzy is making me dizzy, ok thanks,I understand where it is now, does fuel pressure make it work like mbdoc said??, my whole problem may be to low of fuel pressure, I don't have anyway to check the pressure so I'm going to replace both fuel pumps and see if that works, they are 20 years old so they could be worn out, they both still work but maybe not putting out enough pressure.
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  #6  
Old 02-04-2012, 08:20 AM
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wbski007, instead of arbitrarily replacing both fuel pumps (which are expensive) better to get a pressure guage and check the fuel pressure. Throwing unnecessary parts at your problem could result in big bucks spent without a resolution.
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  #7  
Old 02-04-2012, 08:42 AM
wbski007
 
Join Date: Jan 2012
Location: Mary Esther, Fl
Posts: 17
Your right Fred, I'm going to Auto Zone today and see if I can rent a fuel pressure gauge, thanks, Wayne
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  #8  
Old 02-05-2012, 09:27 AM
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If you can't do that you could also do a flow test, sort of what I mentioned before.
Yes, essentially fuel pressure makes it work.
It is important to realize that even though it LOOKS like an ignition distributor, the distributor puts out constant pressure to all the injectors (hence the name CIS, continuous injection system), it is not putting out fuel based on engine timing.
There is a diaphragm inside the dizzy which can fail but it's pretty rare, but yes it can fail. You need some pretty specialized gauges to test the system, even to test fuel pressure on an MB I think you probably found at autozone, probably the stuff they have won't work to even do a basic pressure test.
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  #9  
Old 02-06-2012, 02:40 PM
wbski007
 
Join Date: Jan 2012
Location: Mary Esther, Fl
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Ok I tested the fuel pressure and its getting 80lbs spikeing to 90 at the dizzy, I cracked all the fuel lines at the top of the dizzy and turned her over and nothing coming out any of them, checked the screen at the in line to dizzy and that's clear, so what do you think, I say I might just parts this SOB out. Possable the diaphram is shot??? Gas seems to be just passing right through dizzy cause if I crack the return line it blows out like crazy, I even blocked off the return and still no go, what's up???. Still if I shoot either into the intake it starts and will keep running even without shooting more either in, but I have to keep it reved high, as soon as I let off on the gas it dies and woun't start again on its own. By the way, thanks for all the help so far, I don't want to where out my welcome here but I just might be.
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  #10  
Old 02-06-2012, 03:47 PM
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NO geez you won't wear out your welcome, don't worry about that!
I am wondering (and maybe someone with more CIS experience can chime in), but am wondering if a eha (electro-hydraulic actuator) can fail in such a way to keep the engine from running?
The EHA I speak of is a small black box you notice sort of on the back of the dizzy, has a 2 wire connector attached to it, just held on with 2 screws, easy peasey to replace it, but again I'd hate to see you get one and that's not the problem.
Either that or someone has royally screwed up the mixture.
Gilly
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  #11  
Old 02-06-2012, 03:49 PM
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You could also glance at the OVP relay fuse, this is the small relay near the battery withthe flip open cover on the top. There is a red plastic fuse (a push-in type like what GM uses in their fuse boxes, not like what older MBs use, like what's in your fusebox), check to see if by chance that fuse is blown.
Gilly
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  #12  
Old 02-06-2012, 04:29 PM
wbski007
 
Join Date: Jan 2012
Location: Mary Esther, Fl
Posts: 17
There's two GM type fuse's in the little box behind the battery and their good, I'm going to the u-pull it yard tomorrow and see if I can get the little box your talking about on the back of the dizzy, something in there is stopping the fuel from going to the injectors, thanks Gilly, I really appreciate your imput and everyone else too. I should just lift off the radiator cap and drive another car under it.
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  #13  
Old 02-06-2012, 06:04 PM
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NO don't do that, the radiator cap is ALWAYS the first part to go!!!!

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