Question about 1994 Mercedes-Benz E-Class

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No start, no spark

Just replaced head gasket, on start up i found no spark

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Let me guessa 320. i'm assuming it is not a 420 because the h.f.m. systems worked better than the previous lh. systems. the wire harness are very brittle after about 5 years and your looking at 15 years. This h.f.m. harness was constructed from biodegradable insulation manufactured for europes version of osha. This insulation turns to dust and all you have left is barewire-which shorts to ground and cross shorts like crazy. There is a way to blink code test the vehicle and retreive codes without the engine ever have been running. i have the literature and code diagnostic charts but i think you should have a good look at the crankshaft sensor wire harness. It is held in by a zip tye in the back of the oil filter housing. follow that harness and make sure that the connecter is plugged in and that the sensor is tight. Any damage or corrosion that disrupts this sensitive signal will casue ther to be a constant voltage to your coil packs. You will not have any trigger (just like removing the points from a conventional distributer type ign.) Check your trigger circuit at the coil first. even if you have the mechanical timing wrong you should still have a trigger from the flywheel crank sensor. The camshaft sensor is used for advance and fuel injection.

Posted on Jul 18, 2009

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I assumed that befoe thr gasket change, there is a spark so I don't have to suspect your timing chain setting up correctly for TDC. Here are steps you can follow to check if your have spark
In theory the voltage at the primary coil needs to be on and off to generate high voltage on the secondary coil which has a wire going into the distributor Cap. You want to confirm everything works from the coil, so you can find out what causing the coil is not working. Here are what to do:
1- Disconnect the Positive cable on the battery.
2- Hook a spark plug directly to the coil wire ( the one to get to the distribution cap)
3- Find a long double wire so you can connect from the terminals of the primary coil to the battery.
4- Connect each wire end to the terminal of the primary coil. It doesn't matter which polarity.
5- Connect 1 wire to the frame ground.
6- Hold the other wire and quickly swipe it over the positive terminal of the battery.
7- You should see or hear a spark. If this is the case your coil is good. If itis not, your coil is bad and it need a replacement. Problem is solved.
4- If the coil is good, the problem would be from the Ignition Module back to the ignition key: No electrical signal to turn on the coil.

If you have spark, then you know what to do next? Don't feel bad if you have to redo TDC setting up again. We all have to go through hands-on experience to enhance our knowledge. Let me know if you have any questions.Good luck.

Posted on Jul 15, 2009

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There's either a big loss of coolant from somewhere such as a hose or cylinder head.

It could also be a faulty cylinder head gasket/cylinder head.

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