M102 EHA current totally screwed! (91' 190E 1.8L) - Mercedes-Benz Forum
 
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post #1 of 2 (permalink) Old 08-14-2016, 01:30 AM Thread Starter
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Date registered: May 2014
Vehicle: Slowest 190e out here
Location: Croatia
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M102 EHA current totally screwed! (91' 190E 1.8L)

Hard starts sometimes, I decided to measure EHA current
Engine off, ignition on = -20ma good
Cranking engine = goes down to -50ma instead of positive?
Engine starts cold = getting positive current of 3ma for one minute, that is cold start fuel enrichment, ok
Then I took a ride, full throttle should be 2-5ma enrichment, i see none
When engine braking, fuel cutoff should be -60ma, mine stays at 0
Then the worst happens, current suddenly gets to 10ma and stays there no matter what i do.

All components are tested OK, (OVP, afm pot, o2, new coolant sensor, idle/full throttle switch....)

Any suggestions?
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post #2 of 2 (permalink) Old 08-15-2016, 01:42 AM Thread Starter
BenzWorld Member
 
Date registered: May 2014
Vehicle: Slowest 190e out here
Location: Croatia
Posts: 76
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Quoted: 6 Post(s)
(Thread Starter)
I think I made a mistake
With ignition on, current should read +20mA positive, that's where you start, my eha was connected wrong, now i have -60mA when braking, that's good.
On engine start, it reads +60mA and still doesn't start way it should, it takes 3 seconds to start, after that it starts right up all day long, cold start injector is working properly
Ignition system is in good shape, however, I'm unsure of ignition coil and ezl spark quality, suggestions?
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