Question about 1992 Mercedes-Benz Mercedes Benz 500 Class

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500 SL will not start, replaced the ignition module and crank sensor

The ignition module was replaced and when I touched the crank sensor wire the ignition coil began to make a clicking noise, so I replaced the crank sensor. Now It takes several tries before it starts.

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6 Suggested Answers


6ya staff

  • 2 Answers


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Posted on Jan 02, 2017


Arthur Aldrich

  • 170 Answers

SOURCE: Engine shut down

The electrics in the Mercedes are notoriously flaky. A failing alternator would cause a low voltage condition that would cause the battery to run down but would not likely damage any of the computer modules. Have you REPLACED the fuses that protect the various fuel and ignition modules? Not just visually inspected, but REPLACED them? When I ran my Mercedes 123 series cars, I replaced all the fuses on Day One, regardless of how good they looked. Bosch fuses are known to corrode and cause intermittent problems similar to yours. If a fuse is overheating or the contacts are not good, a few minutes of driving could cause a problem that imitates expensive module failure. It happened with my Mercedes and my Volvos that used Bosch fuses.

Posted on Jan 15, 2009



  • 26 Answers

SOURCE: C320 not starting

If you hear a slight hum in the gas tank when you first turn on the key for 2 seconds the pump is working. Have the fuel pressure checked by a mechanic, it should be about 60 psi. It's usually located just before the injectors. Also have each injector wire pulse checked (light test) to see if there is enough spark to them. Have the ICM Ignition Control Module unit located under the rotor checked for enough spark also. My Trans Am had the same problem, turned out to be a shorted out injector causing it not to fire. If you can get to the wires to the injectors, pull one at a time while cranking to see if it starts or not. If you find that one that's faulty and unplugged the engine will start. That would be one problem. Also have the cars CPU checked to make sure it is not faulty also.

Posted on Sep 13, 2008


Sudeep Chatterjee

  • 3267 Answers

SOURCE: 500 sl wont start

Near the battery. However if you are saying no sparks then check the induction coil which generate these sparks..........sodeep

Posted on Jun 23, 2009


David Parker

  • 333 Answers

SOURCE: sl 500 1991: problem starting when engine is warm

I would check your injectors, as if they are leaking slightly, the residual fuel pressure can force some fuel into the manifold even with the car off, and it it can cause temporary flooding.

Please leave positive feedback if I have helped you


Posted on Sep 15, 2009

Testimonial: "Thanks for your advice. It is most helpful. I have at times smelled the gas fumes when driving as if there was some flooding of sorts. Thanks."



  • 15935 Answers

SOURCE: 99 ML430 143k miles, had codes for misfires on cyl

P0100 OBD-II Trouble Code

Technical Description

Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.

You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.

A code P0100 may mean one or more of the following:

* The MAF may be disconnected, or a wiring connection may be bad.
* The MAF sensor may be faulty.

Possible Solutions

Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back.
Then start with the cheapest, easiest repair procedures:

* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires.
* Unplug and reconnect the MAF wiring harness a few times to clear the contacts.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information).
* Replace the MAF sensor.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Posted on Sep 28, 2010

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Where is the crank position sensor and the ignition module ,coil pack at on a 1998 Pontiac Montana transport

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coil pack-byehkl55qszftorfvkdndylg-2-0.jpg

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What about your ignition module? I can't tell if you just replaced coils or ignition module included? Also, before buying anything, check voltage and ground for ignition module. Pink wire is voltage, black wire is ground.

The crank sensor sends ac signal to ignition module, the module converts signal to dc, something the computer can handle, then sends rpm signal to computer.

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have one of these in the yard with a the big ends gone and a possible cat problem ,on older models like this their is a ignition module and a crank sensor so it has to be one or the other ,the module isnt possible to test as such with right gear but the sensor is ,so disconnect the plug connector and rig up the multimeter across the wires from the sensor and then crank engine ,set multimeter to 10v and see if it produces a voltage when cranking engine if no voltage change it ,the module can be tested as well but on the other end of same connector ,connect an old bulb in a holder and then find the earth side of the two wires with the meter then run a bit of wire from this to earth then the 12v through bulb and touch teh other connection and with the centre lead out of didtributor and hold it close to engine touch the bulb wire to the connection and as you touch the connection it should spasrk if the module is working .

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Trouble code P0320 ignition/dist. engine speed input circuit

P0320 - Ignition / distributor engine speed circuit malfunction

The ignition engine speed sensor input signal to Powertrain Control Module (PCM) or Electronic Control Module (ECM) is continuously monitored. The test fails when the signal indicates that 2 successive erratic profile ignition pickup (PIP) pulses occurred.

- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- The engine may be harder to start
- The engine may stumble or stall

When is the code detected?
The P0320 code is triggered when 2 successive erratic PIP pulses are detected.

Possible Causes:
- Loose wires/connectors
- Faulty Crank Position Sensors
- Arcing secondary ignition components (coil, wires and plugs)
- Low battery charge
- Powertrain Control Module

Possible Solutions:
- Resecure loose wire or connectors
- If battery charge is low, recharge or replaced battery
- Replaced crank position sensor
- Replaced starter motor

Test it and tell us news.

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Loud popping in the intake means that the unburnt gas exploding in intake.... Check cranks sensor and gear. Gear may dirty or even damage or BAD crank sensor the sensor provides reference for spark signal. So this may be your problem. Contact if you need more help. Thanks for using FIX YA

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Thanks for the help on my 93 buick le sabre ive replaced the crank sensor but it still wont start. cranks over ok. no spark. the ignition module has been replaced

thats weird mmmm make sure than you have power going to the black and pink wire or pink with black stripe wire when you turn the ignition on, i don't know what else to recomend you since im not close to the car but the only coming problems on these cars is the module or the crank sensor, did the module installed on it was new? or used? if not sure or even if is new call to auto zone
and ask them if they test ignition modules for free i belive they do and if tehy do take the module out and take it to them, for testing, also by the time you remove the igniton coils turn the ignition on, and make sure you are geting power to one of the coil conectors, and the only way to get to the conectors is by removing the coils, and if there is not power then your ignition switch or a lecttrical problem is present, also make sure to do a cotinuity test to the wires coming from crank sensor to ignition module, check them for open or short to ground

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