Intermitant hard start
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Intermitant hard start
My '96 S320 has started having a problem starting. The problem is , some times it starts fine other times it has to crank more than usual. Also when it is being hard to start it revs up then backs down to normal. Once it starts it runs fine. I've changed plugs, fuel filter but is still the same. I really can't complane - this has been the best car. ( knock on wood)
Any help?????
Rod
Drive on
Any help?????
Rod
Drive on
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Benzboss, Thanks - I was just serching other posts and think the fuel pump is my next try. Then maybe the crank position sensor ( whatever that is)
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
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From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Bull...... No , I have tried several things to no avail. In a couple of weeks I'm taking it in to my fav. machanic. I'll let you know what he comes up with. I just have given up trying to figure it out,
Rod
Drive on
Rod
Drive on
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
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From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Driver55er, Do you have any info on changing this out. Location , special tools , etc.
Thanks
Rod
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Thanks
Rod
Drive on
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From: Shotts,Scotland.
1995 c220 auto
Crankshaft position sensor is shown on this diagram;http://www.detali.ru/cat/oem_mb2.asp...SGR=075&SGN=04 . It is on the crankcase above the starter motor , held by one allen screw but is a bit difficult to access.
Good luck, Geo.
Good luck, Geo.
Last edited by shandy2550; Jun 29, 2006 at 04:18 AM.
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Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Shouldn't I be getting a trouble code if this sencor is bad? Can it be tested first. $130 is a lot to spend if thats not the problem.
Rod
Drive on
Rod
Drive on
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
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From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
FYI changed out the crankshaft positioning sencer - no luck, still have the same problem. Still have to do the fuel pump!
Any other ideas ?
Rod
Drive on
Any other ideas ?
Rod
Drive on
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
???Battery
A lot of people keep asking "what about the Battery?" Well it turns over fine I think ,maybe not as fast as it needs. After work I put the tester on and it showed 80%. Thought after driving it would be 100% or close. What do you guys think ? Could it just need a new battery? My experiance in the past is that one day they just die, no start at all. Its a 84 month battery with only 24 months use. But then again this is Arizona & the heat does bad things. Oppinion please
thanks
Rod
Drive on
thanks
Rod
Drive on
Newbie
Joined: Jun 2006
Posts: 13
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I have exactly the same problem
Rod, replied to your previous post, and neither us seem any further foward.FYI I have replaced the following;
fuel filter/regulator
fuel pump
Crank Position Sensor
Plugs
My cars symptons are , if it was a 70's carb car, that the engne seems to need "priming" with fuel.So logic tells me that either the fuel pump relay is slow or that if there was a relay ( I don't know if there is or isn't) to switch the injectors, this is slow or faulty.
Does anyone know if the injectors are switched electronically, if so, where is the switch/relay????.
ALSO< NOT A SINGLE FAULT CODE IS RECORDED IN THE DIAGNOSTICS
fuel filter/regulator
fuel pump
Crank Position Sensor
Plugs
My cars symptons are , if it was a 70's carb car, that the engne seems to need "priming" with fuel.So logic tells me that either the fuel pump relay is slow or that if there was a relay ( I don't know if there is or isn't) to switch the injectors, this is slow or faulty.
Does anyone know if the injectors are switched electronically, if so, where is the switch/relay????.
ALSO< NOT A SINGLE FAULT CODE IS RECORDED IN THE DIAGNOSTICS
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I have run across this quite a few times-Check your fuel pressure regulator for leakage. With the engine running remove the vacuum line running to it. No fuel should come out of the vacuum supply port. If fuel comes out-you need to replace your fuel pressure regulator.
Senior Member
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From: Dublin, OH
05 ML350, 85 300D
Actually, this car is prone to lots of problems that could cause this- the fuel pressure regulator, the M16 throttle actuator, the MAS, the engine wiring harness, etc.. without knowing what is missing at startup (fuel? spark?) it's pretty hard to track down...
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dear MBTech21
not definite that it is spark, but probably is as when she does start obvious smell of unburnt fuel in exhaust - thanks for your reply to this thread, where is throttle actuator and fuel pressure regulator situated???
Regards
james
not definite that it is spark, but probably is as when she does start obvious smell of unburnt fuel in exhaust - thanks for your reply to this thread, where is throttle actuator and fuel pressure regulator situated???
Regards
james
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Joined: Mar 2006
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From: Dublin, OH
05 ML350, 85 300D
the regulator is in the front of the injector rail, held in with a circlip- there is a production date on it- before a certain date (somehow I'm thinking it's like 10/96- but I'd have to look it up to be sure), they had issues. The throttle actuator is in the center of the intake maifold, where the air intake pipe goes into- same thing with these- certain numbers were no good, however, seeing as your car has lasted this long- you probably have good numbers, but something has failed obviously.
I would start with a fuel pressure test at startup- at least eliminate that
I would start with a fuel pressure test at startup- at least eliminate that
Senior Member
Joined: Mar 2006
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From: Dublin, OH
05 ML350, 85 300D
Two diffferent adaptations you are talking about- one is 'sensor gear', which should be reset after crank sensor/motor mount/and mis-fire complaint part replacement. The second is 'fuel adaptation'- it will actually reset itself given long enough.
Also, it should be noted that we are talking about a 96 here, the fuel system has morphed 4 times since then (not to mention the engine changing twice already on a 320): so what applies then, did not then, and still may not now, the HHT program on the SDS for these cars is the same as the original HHT we had back them- just inside the new spiffy laptop!!!
Also, it should be noted that we are talking about a 96 here, the fuel system has morphed 4 times since then (not to mention the engine changing twice already on a 320): so what applies then, did not then, and still may not now, the HHT program on the SDS for these cars is the same as the original HHT we had back them- just inside the new spiffy laptop!!!
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
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From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
OK guys, you seem to be in the know here!! I have replased the plugs, fuel filter, and crankshaft sensor. None of this helped, so I took it to the mechanic. He said he changed the cam sensor. What is this ? nowone has ever mentioned it as a possible cause of my problem. Or is he blowing smoke. It did do anything except cost $220. Does anyone have proceedures, diagrams or anything for these new things to check. The fuel pressure Regulator, throttle actuator etc.. What is this adaption values ? how is it reset ? Thanks for any help and all the help this far.
Rod
Drive on
Rod
Drive on
Senior Member
Joined: Mar 2006
Posts: 302
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From: Dublin, OH
05 ML350, 85 300D
Like I said, I would check fuel pressure first, to see if it is leaking down , etc.
As far as the cam sensor, I guess it's possible, but I've only replaced a couple in my whole career (usually because of a code).
Adaptations (both kinds) are the car adjusting it's internal map away from the centerline to perform better. If that makes any sense!! Think of 1 as perfect (or centerline)- the car realizes it is running a little rich, due to age, fuel quality, altitude, whatever, so it adjusts itself to .96 and rechecks itself. If the adaptaions go too far away from centerline, a code is set and the check engine light comes on. Sensor gear works the same, except it's looking for misfires, and doesn't want to flag every little engine vibration as a misfire. Hope that makes sense.
They are reset with an SDS machine from MB.
As far as the cam sensor, I guess it's possible, but I've only replaced a couple in my whole career (usually because of a code).
Adaptations (both kinds) are the car adjusting it's internal map away from the centerline to perform better. If that makes any sense!! Think of 1 as perfect (or centerline)- the car realizes it is running a little rich, due to age, fuel quality, altitude, whatever, so it adjusts itself to .96 and rechecks itself. If the adaptaions go too far away from centerline, a code is set and the check engine light comes on. Sensor gear works the same, except it's looking for misfires, and doesn't want to flag every little engine vibration as a misfire. Hope that makes sense.
They are reset with an SDS machine from MB.
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
finally
OK , finally -- pulled the vac line on the fuel pressure regulater had noticable gas smell and maybe a drop of gas. I changed out the regulater and walla car starts like new. Wish this could have been my first thing to change , I could have saved a lot of money and head acke. Thanks for all the help.
Rod
Drive on
Rod
Drive on
