Car will not start

1988 MERCEDES BENZ 300SE

190 MILES • 6 CYL • 2WD • AUTOMATIC

WINGWALKER450

MEMBER
1 POST

My car listed above (300 SEL model) would run for about five miles then stall. It would restart after about thirty minutes. After about eight times of doing this it stopped running all together. I replaced the fuel pump, filter and relay switch. Still would not start, so I replaced the fuel pressure regulator with no luck. Earlier in the year I replaced the plugs and wires and it was running well. I am stuck. Any help would be greatly appreciated.

Thanks.

Sep 14, 2018 at 8:39 AM

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,194 POSTS

Hi and thanks for using 2CarPros.com.

Based on your description, it sounds like there may be an issue with the crankshaft position sensor. Take a look at this link.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Check to make sure the engine is getting spark. Here is a link that shows how that is done:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

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If you determine that the sensor is bad, it is mounted to the crankcase above the starter flange. I attached pictures of what the sensor looks like and its location for you to see.

Let me know if this helps or if you have other questions.

Take care,
Joe

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Sep 15, 2018 at 7:56 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.