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#1
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Crank Position Sensor Function?
Hello,
What is the function of the CPS? Is it used only during cranking, or during driving, or both, and is it the same as a Reference Sensor? Thanks.
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1991 190E 2.3 SOLD 1972 911t 2.4 owned since 4/80 300,000+ miles SOLD 1999 C43 Merlin XLM, All Ti, 17.5lbs. |
#2
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It tells the engine computer where crank is in it's rotation. There is usually a gap, or an additional position, for cyl 1 TDC.
On older cars, such as my W126, it tells the EZK when to fire.
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Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952. |
#3
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I believe it is the same as the reference sensor. I am also questioning the proper name for this sensor. The parts store has them labeled as reference but the benz mechanic also explained to me it has the same functions even though its commonly called a reference sensor 86 300 E
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#4
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The correct name is the reference sensor.
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#5
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crankshaft position sensor
I have a 1991 sel 420. would a bad C.P.S. even allow the car to start when hot? I have no problems when cold but when hot, It will start for a couple seconds and then stall. when cooled down I can start no problem. I'm trying to find out if it is the CPS or something totally different.
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#6
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Quote:
Your problem sounds like a coolant temperature sensor problem or fuel pressure issue. |
#7
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Quote:
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Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein" |
#8
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C.p.s ?
I get up in the morning and I start my car no problems at all, I can drive for hours and have no problems but as soon as I turn it off and go in a store and come back the car hesitates to start. I crank it on it starts for 5 seconds then it shuts down, after about the third or fourth try the car stays on. Sometimes I get it started and take off 10 seconds later my car shuts down with lights all on the instrument panel. My car never idles different through out the day. Its so weired!?!. I was thinking that it may be a fuel check valve and fuel accumalator but replaced both check valves and the accumalator and nothing different. Also I can here the fuel pumps working when hot. Thanks for reading. I'm thinking it may be the cps?
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#9
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lintaro : what vehicle/engine do you have?
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#10
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420
I have a 420 SEL. 1991 126
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