Hankster007

Someone please help. My Wagon is having CPS problems..I have changed Crankshaft Sensors three times in one day from discount sensors, too OEM and the same thing keeps happening.. It will start after it has sat for a few hours and run perfectly. When you shut it off it will not start until it sits for a few hours.....No malfunction Codes and the car runs perfectly when it wants too. What am I over looking??? Will resetting the ECU help??

desired_speeds

probably not the CPS then... scan with SDS to see if there are any stored codes. Possibly K40 is bad.

Hankster007

Thanks, What is a K40? I'll check it out and see if that cures the problem. This is getting to be a circus, even the Techs can't figure it out....

Plutoe

You think you have a CPS sensor problem. How or who suggested changing that with no CPS fault code--------your wasting your time and money.

Could be loads of stuff going on. I would get some freeze frame data for when it quits and go from there!! Is it fuel or electronics?? Good Luck

Hankster007

Had same problem before was CPS...Now in process of checking out harness for problem..No malfunction codes and still problem persists...

ohlord

CPS fail all the time with no check engine lights or codes,stored or active.
Please plutoe stop pretending you think you know anything about a Mercedes and save a lot of gullible people a lot of confusion.

Hankster007

Thanks OLord, I know they fail but not three in a few hours....Changed CPS three times in one day and the same failure accured with all three New CPS's.. Tech is now checking anything else but still cannot get any error codes so he is down to checking the harness....If anyone can think of something please help me out...Car has been in the shop for week and I need it back on the road.....

ohlord

to clarify the misinformed total lack of correct information posted by Plutoe.
CPS fail most often without going code. The symptoms point towards the solution.
Your symptoms appear different than the typical hot run failure to start,cool start after 20 minutes cps failure.
m112 harness failure is very rare, and in the case of one it would throw a circuit malfunction of some item.

Plutoe

Wada load of HS!!

Hankster007

Guys play nice...Thanks to both of you...The problem is now with the Techs...Lets see what they come up with and if they fix it...Will inform of outcome!!!

Hankster007

Car spent almost a week with the Techs, picked it up drove home, drove like a dream...Got home turned it off.. Tried to start it, same old problem, would not start, just crank and laugh at me....Took it back to shop and Techs told me they did not know what was going on...No Codes nothing....So I am back to square one......Guesses anyone?????....So Far have changed CPS, MAF, CMS, reset ECU....I love this car but it is getting to the end of the line with the frustration it is causing......

Hankster007

Today had car towed from gym home of course it would not start at gym...Got car home and low and behold it started right up have driven car around and stopped more than 25 times and it has started right up....Note last time it was toed same thing happened it ran fine for about a week and then started acting up....Why would it straighten up and fly right when it is towed.....is there a line that maybe pinched and then reverts back.....or am I just starting to dream....

ohlord

Pressure regulator is built into the filter. Old filter can cause the issue and at times throw the codes normally associated with MAF failing.
WWW. autohausaz.com for filter
diy on
www.benzworld.org
w210 diy section

Hankster007

Thanks OLord will replace filter tomorrow...hopes this fixes her I'm tired of not knowing if she is going to start or just laugh at me......

Hankster007

Replaced fuel filter this morning only took 45 minutes, she started up with a little trouble but then started to run perfect....At least it started, rode around the neighbor hood awhile and parked it in the drive. Will go out in awhile and see if she starts right up....Thanks OLord maybe this will cure the lady...

Hankster007

Back to square one as of this morning.....Now it seems to be a fuel pump problem....When it does not want to start I don't hear the fuel pump go on....When it does start I hear the buzz of the fuel pump turning on when I turn the key....So going to give that a try....

Musikmann

I think there might be a fuel pump relay that you can check first.

Hankster007

I will check the relay first thank you for reminding me will keep everyone update on the soap opera untill the last episode ''''

Hankster007

After weeks of problems, the problem has been solved. A frayed wire connecting to the fuel pump was causing all the trouble...Found it while installing new fuel pump...Hope that this puts an end to all the troubles.....Thanks to everyone for all their input and hope that my troubles will help someone who is having the same problems.....