I have a 1995 MB S500 that has 90,000 miles on it. The dealership performed a 80,000 service on the vehichle and everything checked out ok. At about 89,000 miles the car began to die while I was driving it. Sometimes I could wait several minutes and the car would crank up and run fine. This happened several times until one day I ran the battery down trying to start it. I had the car towed home and charged the battery overnight. The next morning the car started right up and I drove it for a couple of days until it died again and now it will not start at all. The engine turns over but it sounds like it is not getting any fuel or spark. Does anyone have any suggestions?

 

get the engine scanned for codes, also do you have any lights on like check engine?

 

No I have never had any check lights on when the engine has died. I did do some research today and it seems that the crank position sensor could be the cause of my problem. I have found that only does MB have this problem but that it is a common problem with European vehicles. I will test the sensor this weekend and replace it if it is bad. I will post the results in a few days.

 

yes, that could be the reason. CPS might be the cause

 

From experience, it probably is not the CPS, but either wiring connections, wiring harness(es), computer modules pins needs cleaned and reconnected, even if fuel filter was changed at 80K service,another fuel filter may be still needed, fuel pressure regulator now acting up due to other repairs, etc. Bottom-line, get the car scanned for stored computer errors. The CPS(s) are difficult to replace. Repairmenat times get in a hurry and jerk on cables and connections and these years of MB cars are very sensitive to everything electronic working only just perfect. No check engine light does not mean no computer stored error codes. Before investing in costly parts and labor, best to do the normal diagnostics steps first.

 

I have two questions if someone could has a manual or knows the answer.

1. I have located the CPS and replacing it looks simple. I disconnected the plug and tested it with my meter. I got a reading of 824-827 ohms. What is the factory specs for the CPS?

2. What procedure do I use to get the codes from the X11/21s1 with the push button and led?

Thank you in advance for any help you may provide.

 

I did test for fire to the spark plugs and there was none.

 

I agree withBill,

It sounds elementary to me, but that by no means, mean that it is! More particularly, it sounds like the fuel filter is clogged and need to be replaced, or the Fuel Pressure Regulator need to be replaced, or you have a weak or malfunction fuel pump. I'd try the least expensive replacements, first.

David

 

I don't think it is a fuel related issue. I have tested for spark to the plugs and there is none. The fuel pumps may not be coming on. Whatever is causing my problem may also be stopping the fuel pumps to come on. But without fire to the plugs I don't need to worry about the fuel right now. If someone has a shop manual for my car could you please look up the proper resistance for the CPS so I will know if mine is bad or not.Thank you from a newbie.