1990 420SEL No spark
 

I have a strange problem with my 90' 420SEL.Car will start cold run for about 5-10 mins then quit while driveing or idleing.Try to restart hear the fuel pump running smell fuel no spark.Try to restart for about 2 mins starts and will drive for the day(car never sits long enough to get cold).Next morning same story.Thinking EZL but can not confirm.Any help appreciated!!

Most likely the fuel pump relay.

Highly likely that the magnetic sensor on the ring gear is bad. They get flakey when they heat up. Some people refer to this sensor as the crank position sensor. It is located on the left side of the engine where the bell housing meets the block behind the cylinders. Difficult to get to.

Not thinking fuel pump relay as I can smell fuel and hear the pumps running as I crank.Would the crank shaft position sensor likely fail at the same time every morning?And is there a test for the sensor?Thank you

Tested the crankshaft position sensor and yes that is the problem.Thank you

posistion sensor
 

Mike look up a post I have, it will show you the sensor, and the unorthodox way I fixed it,you can get a wrench on one bolt but the other I could not so I drilled a hole to access the other bolt,A plastic cap sits on top of the unit,It just pops off.The two bolts hold a bracket of aluminum,in which the sensor resides.:kiss:

I found it thank you! This is going to be great fun....Do you know what book time is for the job?

NO I do not, but until I spent the time to Analise how it was PUT TOGETHER I beet, pried, pushed, used a lot of not so nice words,and two days or more before it fell out in my hand,and it was suddenly fixed. JNT

Thank you again for the help.I am going to see what I can do with it today.Wish me luck...

Quick bump on this post - my 85 380SE won't start. Could this crankshaft position sensor be my problem? It was running fine, parked it last Tuesday night, and it wouldn't start again. I have spark and fuel (I think - at least from pulling one of the plugs after cranking), so I can't figure out what's wrong. See my parallel thread here:

http://www.peachparts.com/shopforum/tech-help/187294-help-w126-wont-start-380se.html

No this would probably not be your problem as mine was no spark.The TDC sensor sends signal to the ignition control telling it to spark.No signal no spark.Sorry to hear about your problem as I an not familiar with your particular car I will leave it to some on else to point you in the right direction.

Well Mike how are you doing with that sensor job?