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 Robert Your Own Question

Robert, UK Qualified Car Technician
Category: Car
Satisfied Customers: 4503
Experience:  Fully qualified / self employed garage technician in the UK
Type Your Car Question Here...
Robert is online now

Can you advise location of glow plugs on a 2002 e class Me

Resolved Question:

Can you advise location of glow plugs on a 2002 e class Mercedes.
Submitted: 2 years ago.
Category: Car
Expert:  Robert replied 2 years ago.

Hi..there apoligies for the delay..

On the CDI engine..once you have the engine cover off if you look at the passenger side of the engine or locate the Common Rail/Fuel pressure see the solid injectors lines coming from up to the injectors itself - if you look slighty up from the rail at the cylinder head you'll see small black plug connectors..those are the glowplug connectors you need to remove to get at the plugs itself..if your having trouble finding them just let me know and i'll locate a photo - However before you even start to remove them make sure you get the wd-40 straw beyond the connector and spray lots of wd-40 in there to soak into the glowplug threads you may want to this after a run or during cold either way you'll need to give the fluid time to soak in so make you soak them properly and not spare on it..then warm the engine up and soak again..then remove the caps over the plugs these need to be squeezed at either side ti clip off the end of the plug sometimes the use of glowplug cap removal pliers can help..then once you've exposed the top of the glowplug then make sure you use the correct sized long reach socket/extention/ratchet and slowly and evenly and carefully undo them from the cylinderhead..if they become stiff to undo during the removal process stop and reapply the wd-40 again and work the plug back into the head then back out - undo again and keep doing that until you feel the plug is free enough to undo completely..bear in mind these do have habit of snapping sometimes - but usually the method above of lots of wd-40/warm engine should prevent that..when refitting the new ones /spray threads with wd-40/or a small amount of grease - make sure you seat the threads in by a way of seating the plugfirst and screw in by hand only until its screwing in..then finish it all the way with the ratchet and tighten up till roughly 20 Nm torque ..not to over tight just till you feel them bottom out usually.then fit the plug caps back on..I do hope this helps..I if you need to ask anything else or include anything further then just continue before you rate

Customer: replied 2 years ago.


Is it fair to say these glow plugs are on top of the engine ?

I can see 4 plug caps in a row which I thought were the location of the glow plugs but the plugs caps themselves are a bit of a challenge to get off. If these are the caps we need to remove can you suggest the best way to get them off.


Expert:  Robert replied 2 years ago.

Hi..there thanks for your responce..

No that will be the injector tops..the glowplugs on the CDI engine are just in at the side of the cylinder head passenger side - ive included a pic of two of the electrical cap plugs you need to remove they send the voltage to the plugs once off then you see the end of the glowplug itself...We use a pair of special pliers that go down the side of the cap and squeeze it gently to release the tabs and pull the cap up and off the could may use two small long thin flat head screwdrivers in at both side and push in gnetly and lever up might work..the problem you dont want is to damage the plug connector/cap or you'll expose the electrical contact that supplies the plug with voltage to work..i do agree they arent the best for removing on these engines.think its the 3rd one along can be tricky but using 3/8 ratchet - long reach socket thats fits the glowplug " test on new ones first" and extention a medium long reach should help..I do hope this helps further..

Robert, UK Qualified Car Technician
Category: Car
Satisfied Customers: 4503
Experience: Fully qualified / self employed garage technician in the UK
Robert and other Car Specialists are ready to help you

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!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, 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:

  • Greg



    Satisfied Customers:

    Automotive diagnostic tech
< Previous | Next >
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician
  • Rob's Avatar


    ASE Certified Technician

    Satisfied Customers:

    30 years trade experience
  • uk_iaibal's Avatar


    UK Car Mechanic

    Satisfied Customers:

    Verified Car Mechanic.
  • Billy's Avatar


    Trainer/ Master Technician

    Satisfied Customers:

    Trainer 8+ years, master tech. 10+ years, SAE member
  • Mike Kelly's Avatar

    Mike Kelly

    Auto Service Technician

    Satisfied Customers:

    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.