Invent Jetronic ignition control for Mercedes

VulpesIgnis

kpraz I am waiting for a mate of mine to install an M103 in a W460 to go ahead and install the spark control system, I will keep everyone tuned and i'll try to write a guide aswell!

Larttis

Has Anybody done this yet, im doing it in couple of months?

DocAlfa

VulpesIgnis hello did the cluster work with the new hall signal?
thanks
Søren

JHM

DocAlfa
cluster use hall-like signal from EZL, so it should work like before.

Alviss

VulpesIgnis Hello. Did You managed to install spark control system from Invent to Your MB?

Larttis

I was trying to get this setup to work and when cranking the car with the dh with no sync setting on, it was not showing any rpm and the hall sensor signal was only shoving 0.1 volts. maybe I have to change the wire to bigger but could that be the problem?

JHM

Larttis
have you connected hall sensor signal to the DH input?

Larttis

JHM yes i have, now im doing the wires better for the hall sensor

Larttis

Now i'm getting fuel and spark but the igntion timing is not correct and it Will run maybe for 2 seconds with underground 500 rpm. I was messing with the ignition settings and they weren't doing nothing.

Larttis

I Will try the test fixed angle when but does it work when only cranking the car?

JHM

At cranking, ignition is formed by a hall signal edge. No settings are effective at cranking except hall signal inversion, which defines an active edge of a hall signal.

Use strobe light to check if ignition angle is near tdc while cranking

Larttis

JHM okay, it was 20 after tdc when cranking and i believe at idle it should be 8-12 btdc? The car was starting when pressing gas pedal to floor and then not giving anything because the cylinder cleaning, so it was getting too much fuel maybe because not ingiting at right time. I will do more testing later, ran out of battery.

Larttis

And second thing I'm thinking is it important that my cars ignition is the ezl system not the earlier tsz?

JHM

20 after TDC on idle or on cranking? It's different operation modes.
Check what RPM is displayed in Commander.
Better record a video with sound of engine and view of commander when starting up

Larttis

Hello, here is a log of M102 engine running with the invent ignition. The idle is not stable and it's hard to use the timing light because the ignition is jumping, but when I put the test zero angle on, it runs more stable, but still the ignition is not stable. Also when I press gas pedal it will bog down and backfire or shut off.

log-jetronic-0f10-v4018-20240907-165648.csv

115kB

JHM

I don't see a running engine in this log, just an unsuccessful start attempt

Larttis

JHM What do you mean, in the log the engine fires up at around 7 second mark, but the idle is fluctuating. Around 57 seconds in I put zero angle test on and the idle is more stable. Here I post it again, if that one is corrupted. My question is, is there anything in the log that would explain the fluctuating idle or the fact that the engine wont rev. Thank you!

log-jetronic-0f10-v4018-20240907-165648.csv

115kB

JHM

Ignition angle is wrong. Check it with the strobe light.

Larttis

I tried to change the ignition timing but the settings dont do anything, could the coil be bad or what is it. I have no idea what to do next.

JHM

Larttis
Possibly wrong coil driving polarity.
Should be this for a recommended coil:

Larttis

JHM im using that setting, with the other one it was running worse, but it feels like no setting is doing anything the car is running at 300-700 rpm and and very Rich ingition settings are not working. I tries dwell 2.0-6.0 ms no change

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