E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

m104.980 no start, has spark

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Old 11-30-2019, 09:10 AM
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c124 124.051
m104.980 no start, has spark

Hi everyone
So after becoming difficult to start when warm the car will not start at all now.
It has a spark ans feels and sounds close to starting but does not.
There is a bit of dark smoke from the exhaust and a strong smell of fuel.
The plugs were a bit sooty when removed, I just cleaned and refitted as they were less than a year old
The cap and leads are of the same age as well.
I have replaced the crank and cam sensor but still have a code for the crank sensor,
I have read that with a no start situation you will get this code anyway, can anyone confirm this?
Just the fact the car is firing will suggest the cps is ok, correct?

I also have 4,5,6, blinks on pin 14,
4- output oxygen sensor heater control defective
5- output for air inj pump control defective
6- output for kickdown switch defective

Does anyone have any ideas where to go from here?



thanks Matt

Last edited by matt72; 12-01-2019 at 08:34 AM.
Old 12-02-2019, 04:08 AM
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95 E320 cab, 81 300D,, 83 300D
Check your EA (throttle body)

Can you hear the EA "buzzing" when the key is in "run"(2). With the air intake off - push the butterfly of the throttle open (key off), then turn the key to run and check that it is MUCH harder to manually push open. There's a lot of things that might throw those codes - including the MAF and even the OVP, but check the EA before throwing parts at the car.
Old 12-02-2019, 11:21 AM
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c124 124.051
Thanks for the reply , I will give that a try but when you say EA is that the black box on the fuel distributor?
Old 12-02-2019, 11:47 AM
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c124 124.051
No buzzing from the eha and the throttle butterfly is the same with ignition on or off, very easy to move
Old 12-03-2019, 06:54 PM
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95 E320 cab, 81 300D,, 83 300D
Bad wiring harness or EA

I'd say wiring harness - but it's unlikely that you'd still have an original harness in 2019. The EA/ETA/ISC (you'll see all three of those used - referencing the same part, which is a hybrid drive by wire/mechanical throttle bod. Anyway - it has a plug on it, and about 18" of wiring. Make a small slit in the sleeve. If it looks like copper taking a nap in a cottonfield - that's your problem. It's fixable - but don't do that. Buy an EA made after 94.
Old 12-04-2019, 10:32 AM
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c124 124.051
ok so today I inspected the wiring and restested for faults and the codes for pin 14 has cleared and i have codes on pin 3 now.
7 blinks- rpm signal at cfi illogical
27 blinks- no data between cfi and ezl
The knock sensor that plugs into the ezl lookd very crusty and the insulation is coming off the wires.
Will this give me a non start situation?

thanks again

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