Well in frustration , I decided to line up all the mechanical timing components to make sure that we didn't have any mechanical reason to believe that our problem isn't electronic. the result was the same ......it cranks but not even a stumble. ...I'm going after a ignition control unit next ...whats left?

Have you checked for spark while cranking?

__________________
Junqueyardjim
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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

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yes ..we have spark,m but no start....the major question is do we have timing

If you have spark but no fuel, I assume you have to check out if fuel filter is clogged or fuel pump is dead? If you key on and fuel pump buzzes, then you know a filter is clogged right?
Not trying to thread jack, I am have same problem as 190e

Did you try using starter fluid?

yeah guys...Ive thrown every thing I could think of at this thing.

I checked each of the injectors...good misting on all of them...even the cold start value.
I but in new Bosch plugs
I check the boot for leaks and fit....every thing was good
I check fuel pressure and went through the fuel distributor check ....
there is nothing left ....
I check the spark on every cylinder
I check the dwell angle which appears to be low 3.6 from standard 9-45
I check the coil
I check every no start component on this darn thing according to the no start problem check list
which leads me to believe we have a electronic problem....which I have no equipment to check other than a VOM meter
so that where I am at

i had a no start condition on my 190e that was caused my the wire to the temp sender for the cis being broken not sending a siginal to the ecm. It would try to start in lean mode. check the wire and the sender. hope this helps.
Joe

this may sound stupid, but it happened to me on my m103 (thankfully nothing was broken), but check to make sure you have the right firing order on the wires - if they are wrong you will still get spark, but not at the right time.

also, CPS could be the problem although if you have good spark it technically is ruled out.

what finally fixed my no-start condition was a new EZL ignition unit and new plugs.

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87 300E
202k on the clock

I seem to have missed your post saying it did start with the starter fluid. You're sure about spark and fuel so next is to check air.

Check the AFM plate if it visibly goes down when you turn your key to Key-on-engine-off position. Also have some body start the engine and while cranking slowly push the plate down a millimeter or two. It happened to me once where I over adjusted my fuel mix and the engine was not getting enough air. It can also happen that the engine is getting too much air.

we tried that some time ago with no result......and with starter fluid ..it didn't even stumble
it getting clear that I think the problem is a timing issue.

I read that you mentioned teching all the sensors. Just curious, did you follow the trouble shooting guide from the MB manual?

yes, step by step

I suggest checking the compression - if the timing slipped you may have some bent valves, which would immediately be shown by either very low or no compression.

__________________
Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C

compression on all cylinders are about 155lbs +-3lbs so we have no bent values not bad for a car with 175k

That tells me your cam timing is ok, and the engine should fire if it has spark and fuel. So, remove a spark plug, lay it on top of the engine where you can see the tip, and turn the engine over. Does it have a good hot spark? If it has fuel and a hot spark at the right time it will run. Get a timing light and check #1 spark plug timing using the timing marks. If the timing is even close, it will fire, so I'm guessing you are losing spark under compression, or the timing is way off, or you have the plug wires connected improperly.

__________________
Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C