How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Stan Your Own Question

Stan
Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
16766657
Type Your Mercedes Question Here...
Stan is online now

SL(###) ###-####150k miles - runs perfectly mins then seems

Resolved Question:

SL(###) ###-####150k miles - runs perfectly for 2 mins then seems to go to safe mode. at local garage they checked and cleaned injectors, had ECU's sent to expert and checked ok, Exhaust and CAT checked ok.
Only some injectors are firing when problem occurs and each time it's different injectors.
Took to mercedes dealer Doncaster and they coudn't find problem.
Please help been 12 months and many experts!!!! and all baffled.
kind regards
Submitted: 1 year ago.
Category: Mercedes
Expert:  Stan replied 1 year ago.
Hello,
What do you mean by safe mode?
Is the engine misfiring?

Are there any fault codes detected by engine control unit?

Best Regards,
Stan
Customer: replied 1 year ago.

Hello Stan

Yes the engine is badly miss firing. switch off and leave it a bit start up and runs perfectly for about 2 mins and then starts miss firing . At Merc

no codes and they said no fault indicated. Merc wanted to strip and clean the injectors and fuel link but that had already been done.

Obviously when it warms up the problem kicks in.

regards

Graham

Expert:  Stan replied 1 year ago.
Hello Graham,

One thing to try is to disconnect the mass airflow sensor and see if engine runs better without it on a emergency substitute value. When this sensor is giving incorrect reading, the mixture can become very lean and cause misfire.
Also, i suggest to connect a booster cable to the engine clean metal part and to battery's negative post. Poor engine ground strap can cause very abnormal issues.
Do not hesitate to get back to me after trying this, will do my best to help.
Best Regards,
Stan
Customer: replied 1 year ago.

Hi Stan

Thanks I'll try that. Will be Friday. At transport research laboratory TRL

tomorrow. I had the idea and developed the wire rope crash barrier for UK highways with the HA now Highways England and TRL.

best regards

Graham

Expert:  Stan replied 1 year ago.
Wish you a productive day at the lab, hope that with your help the highways will get safer.

Just get back to me at your convenience.

Cheers Stan
Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience: Technical support engineer
Stan and other Mercedes Specialists are ready to help you
Customer: replied 1 year ago.

Hi Stan

you''re in America. Took 10 years working with FHWA to get approval in the States - now all over the State Turnpikes and Freeways. Manufacture in Oklahoma City.

betsregards

Graham (Scottish)

What Customers are Saying:

 
 
 
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
 
 
 

Meet The Experts:

 
 
 
  • Matt

    Matt

    Mechanical Engineer

    Satisfied Customers:

    504
    BEng hons Mech engineering, in auto industry 22 years
< Previous | Next >
  • http://ww2.justanswer.co.uk/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    504
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.co.uk/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    ASE Certified Technician

    Satisfied Customers:

    21406
    Bosch Certified Master Technician with over 35 years experience in the automotive industry.
  • http://ww2.justanswer.co.uk/uploads/MI/mikeamechanic/2013-4-2_175558_photo.64x64.JPG mike_a_mechanic's Avatar

    mike_a_mechanic

    Mercedes Mechanic

    Satisfied Customers:

    116
    17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
  • http://ww2.justanswer.co.uk/uploads/MB/MBpaul/2013-8-21_204936_paul.64x64.jpg MB Paul's Avatar

    MB Paul

    Mercedes Technician

    Satisfied Customers:

    212
    Mercedes Benz Qualified Diagnostic Technician
  • http://ww2.justanswer.co.uk/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Technician

    Satisfied Customers:

    1094
    Automotive diagnostic tech
  • http://ww2.justanswer.co.uk/uploads/TE/techmachine/0601821347169_717372168_8940977_39623330_o.64x64.jpg Ross's Avatar

    Ross

    Diagnostic and repair technician

    Satisfied Customers:

    467
    Licensed diagnostic and repair technician