Question about Mercedes-Benz ML500

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1992 mb 500sl runs great...problem won't start after driven and off even for a brief period????

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The fuel pressure has to be checked.If its low then car will take time to start.If fuel pressure checked low then its fuel pump and fuel filter to be checked and replaced.When this parts gets faulty the fuel pressure gets low.

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The other possibility to check is spark.When you say car will not start after off for longer period so when you start it do you get spark at spark plugs or not:---If no spark then it can be coil pack or spark plugs related problem.

If the engine has no spark, check for voltage at the coil positive terminal when the ignition key is on. If NO voltage, then problem is on the trigger side of the coil (pickup, crank sensor, ignition module or primary wiring circuit).

But If there is NO voltage at the coil itself, then in that case the problem is on the supply side (the ignition switch or ignition wiring circuit).

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But if your car cranks and does not start then in that case there are few more possibilities including fuel pressure and spark plugs.This possibilities are as follows:---

A car that cranks over but doesn't start, in many cases will be due to a bad fuel pump, a broken timing belt, an inoperative cam sensor or crank sensor. Also these problems are related to faulty spark plug. Check the spark at spark plugs when you start the car. Do you notice any spark. Actually you should see. If in case there is no spark then it's a spark plug problem. Also the coil pack gives power to spark plug. So check the voltage at coil pack. It will show 12 volt. If there is no voltage noticed at coil pack then its faulty coil pack that has to be replaced. If all the possible options checked out ok then check the car starter. The starter gets power from battery to start the car. If the starter is faulty then it will not let the car to start. Also check and confirm that there is fuel in the car. If its very low fuel then in some cases this causes the problem. Also check and confirm that fuel pump is functioning properly and the fuel filter is not clogged. One of the easiest ways to check for a fuel pump related problem is to spray a little starting fluid into the air intake while trying to start the car. If the car starts momentarily, then there's a good chance the fuel pump is not working or the car is out of gas. You can also listen for the fuel pump's humming sound when the key is first turned on. Also if a inoperative fuel pump is suspected, a good technician will always check to verify there is power and ground being supplied to the pump, to eliminate the possibility of a bad relay or electrical issue. Fuel pressure can be checked with a pressure gauge and if there is pressure, pulse can be checked at the fuel injectors in several ways including the most common, with the use of noid lights. If the injectors don't have pulse the engine won't start.

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But if there is no start at all then the problem relates to loose battery connection or weak starter.

First of all make sure there is very good ground connection. Start checking at the battery, and completely clean the battery terminals. Also make sure the battery is good, not weak. Poor ground connections will make electronic devices not work properly.C

heck and clean all the connections from the battery to the starter.If this connections are dirty or corroded then this kind of problem is noticed in cars.

---------- This troubleshooting tips will help you to solve the problem. Thanks. Helpmech.

Posted on Dec 30, 2010

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