M103 engine runs for 3 second and stalls, please help - Mercedes-Benz Forum
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post #1 of 70 (permalink) Old 05-22-2019, 06:51 PM Thread Starter
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M103 engine runs for 3 second and stalls, please help

i didn't start the car for 3 days, today i i tried to start it it didn't, it starts right away and run smoothly for 3 seconds and then stalls right away !!, no matter how you press on the accelerator pedal it will stalls quicly. please help.

my over voltage relay is a month old, from the dealership, put back the old one, the same.
my Fuel pump relay is a month old from the deanship also, put back the old one, the same.
i hear the idle valve making that click sound when i turn on the keys, so its working.

what am i missing here !!!


youtu.be/hmfrGgGaIH0 (the link for the ones who can't see the vedic up there)
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post #2 of 70 (permalink) Old 05-22-2019, 06:58 PM
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Quote:
Originally Posted by Faiz Jan View Post

what am i missing here !!!
a tach signal or something?

that could indicate a problem with the ezl

check connections and if you have a spare one they're easy to swap.
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post #3 of 70 (permalink) Old 05-22-2019, 07:55 PM Thread Starter
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Yes i do have one, i will install it in a minute, i will keep you updated.



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a tach signal or something?

that could indicate a problem with the ezl

check connections and if you have a spare one they're easy to swap.
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post #4 of 70 (permalink) Old 05-22-2019, 08:10 PM Thread Starter
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No, i swapped the EZL, put back the old fuel pump relay, over load relay.

what happened to my baby ?????????


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Originally Posted by christuna View Post
a tach signal or something?

that could indicate a problem with the ezl

check connections and if you have a spare one they're easy to swap.
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post #5 of 70 (permalink) Old 05-22-2019, 08:21 PM
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I've been daily driving M103 powered cars for years and every couple of months I have to clean my distributor cap posts because of buildup (I live in a damp climate) and when that didn't work then I had to swap the coil and everything would be ok (even though coil tested good on the resistance test).

if you have your cap out its not a bad idea to pull the wires from the plugs and check the resistance (from cap post to plug end about 2,000 ohms)
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post #6 of 70 (permalink) Old 05-22-2019, 08:30 PM Thread Starter
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the weather is humid for the past 2 days, i will open the rotor and cap and see what is going on, the wires are brand new, like 2 months old (Beru), will keep you updated.


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Originally Posted by christuna View Post
I've been daily driving M103 powered cars for years and every couple of months I have to clean my distributor cap posts because of buildup (I live in a damp climate) and when that didn't work then I had to swap the coil and everything would be ok (even though coil tested good on the resistance test).

if you have your cap out its not a bad idea to pull the wires from the plugs and check the resistance (from cap post to plug end about 2,000 ohms)
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post #7 of 70 (permalink) Old 05-22-2019, 08:40 PM
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Crank Position sensor? I believe there is 2 of them. One will go directly to your EZL. Recheck all wiring and fuses first. voltage regulator also could be checked.
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post #8 of 70 (permalink) Old 05-22-2019, 08:47 PM Thread Starter
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Clean, nice and shiny from inside.


Quote:
Originally Posted by christuna View Post
I've been daily driving M103 powered cars for years and every couple of months I have to clean my distributor cap posts because of buildup (I live in a damp climate) and when that didn't work then I had to swap the coil and everything would be ok (even though coil tested good on the resistance test).

if you have your cap out its not a bad idea to pull the wires from the plugs and check the resistance (from cap post to plug end about 2,000 ohms)
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post #9 of 70 (permalink) Old 05-22-2019, 08:49 PM Thread Starter
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Yes there are 2 sensors, one in front, and one in the back, i have no idea how to test them, do you ? Voltage power regulator is a month old, Brand new from MB i put the old one to test, the same it didn't work.

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Originally Posted by LTYLER View Post
Crank Position sensor? I believe there is 2 of them. One will go directly to your EZL. Recheck all wiring and fuses first. voltage regulator also could be checked.
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post #10 of 70 (permalink) Old 05-22-2019, 08:54 PM
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Just to be clear, Voltage Regulator in Alternator, Bosch brand, not OVP relay on the top near firewall. That's what i assume is new from the dealer.

Try this for testing

https://www.benzworld.org/forums/w12...g-cps-ezl.html
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