Mercedes

Have Mercedes questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

1999 C230: Have lost power, shakes at idle. Fuel injector..clicking…

Customer Question
Hi, recently purchased 1999 C230...
Hi, recently purchased 1999 C230. Have lost power, shakes at idle. Fuel injector #3 is not clicking as loud as the other three. Codes P0170 & P0303 are showing.
Submitted: 8 years ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Answered in 2 hours by:
6/28/2010
Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 8 years ago
Michael Warfield
Michael Warfield, Factory Mercedes-Benz Technician
Category: Mercedes
Satisfied Customers: 3,143
Experience: Mercedes-Benz Master Certified technician
Verified
I wouldn't put to much faith into the #3 injector not clicking as loud. I would try swapping your MAF sensor for a known good one. If you don't have that option you should just buy a new one, they are notorious for causing loss of power and will eventually cause a misfire like you are experiencing now. Try to purchase a Bosch MAF sensor not from the dealership since it is outrageously priced at $400-500.
Ask Your Own Mercedes Question
Customer reply replied 8 years ago
My brother has said, that before changing the MAF, I should check for a vacuum leak. He believes that a vacuum leak would cause the same problem. May also cause the same codes to appear.
What do you think? Thanks.
Customer reply replied 8 years ago
Can you please send me info on removing the MAF sensor, with photo if possible.
Thanking you,
John
Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 8 years ago

Try spraying some carb clean or brake clean around vacuum lines intake tube connections. If the engine idle changes or stumbles when you spray, you have a vacuum leak. Usually a vacuum leak won't cause loss of power, but a poor idle. If the leak was bad enough in a supercharged car it could cause loss of power though. Your fault codes do indicate it could be a maf sensor or possibly a vacuum leak. Try spraying first though. I can't get a picture till tomorrow but the sensor is a very easily distinguishable part of the intake tubing. It should be on the driver's side. Just follow the intake tube, the sensor will be mounted on the tube about 2 feet before the throttle body and removal is simple. Just pop the 2 clips that hold it on and slide it out.

 

Ask Your Own Mercedes Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mercedes mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Michael Warfield Your Own Question
Michael Warfield
Michael Warfield
Michael Warfield, Factory Mercedes-Benz Technician
Category: Mercedes
Satisfied Customers: 3,143
3,143 Satisfied Customers
Experience: Mercedes-Benz Master Certified technician

Michael Warfield is online now

A new question is answered every 9 seconds

How JustAnswer works:

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

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

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 PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

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.

CharlesWalnut Creek, CA

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!

SueCharleston, WV

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.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

29,460 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

4,460 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,143 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

643 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

< Previous | Next >

Related Mercedes Questions
My daughter has a 2005 C230 comprerssor mercedes. It runs
Good evening. My daughter has a 2005 C230 comprerssor mercedes. It runs terrible after you pounce on the accerlator. I have a OBD reader and PO303,PO301 came up. PO171 and PO170 are present also. The … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
2005 c230 died while driving the other day and wouldn't
2005 c230 died while driving the other day and wouldn't start. Threw codes p0300, p0303, p0304. It ran rough a few months ago and threw code p0301 so I replaced the plugs and replaced the ignition coi… read more
Dan
Dan
Dealership Technician
Associate Degree
2,145 satisfied customers
C230 Kompressor 2005: Idles with a rumble. Runs smooth with
C230 Kompressor 2005: Idles with a rumble. Runs smooth with full power until I sit at a light or in park. Then, after 15-30 seconds it sounds like running on 3 cylinders and has no power. Electronics … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
C230 Kompressor: I have a 2000 Mercedes C230 Kompressor with
I have a 2000 Mercedes C230 Kompressor with the codes P1525 and P0170. P1525 seems to point to "ABV vacuum solenoid circuit fault." What is this and where is it located / fixed. I have never seen this… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
slk230: P0303, 0304,0301,0302, P0170,P0300 These are the OBII
P0303, 0304,0301,0302, P0170,P0300 These are the OBII read codes I get in this order. Where do I begin my troubleshooting. My car is running intermittently. Yesterday it seemed like it was not getting… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
C230 Kompressor: have a c230 kompressor 2003 keep getting same
have a c230 kompressor 2003 keep getting same three engine codes of P0128 coolant themostat and P0172 and P0170 says bank one is rich and trim how can that be?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1999 mercedes c230 kompressor: misfire..coils..spark plugs..injector
1999 mercedes c230 kompressor, i keep getting codes for a cylinder #2 misfire and p0170 but cannot find the prob. i changed the coils, boots, wires, spark plugs, o2 sensors, and the MAS[made car run w… read more
Hipo64
Hipo64
Mercedes Technician
High School or GED
444 satisfied customers
1999 Mercedes C230 Kompressor: shakes..acceleration..spark plugs
My 1999 Mercedes C230 Kompressor runs very rough, shakes and has very slow acceleration. I have changed the coil pack and spark plugs, but I am having the same issue. I went to Advance Auto and had th… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
C230 Kompressor: ).Two days ago, check engine light came..malfunction
Hi Paul, I own a MB C230 Kompressor 1999 (123,ooo miles).Two days ago, check engine light came on. DTC was P0170 (fuel trim malfunction bank 1. I took out the MAF sensor and cleaned it using MAF senso… read more
MB Paul
MB Paul
Mercedes Technician
Vocational, Technical or Trade Scho
3,567 satisfied customers
1999 slk230: It shakes in idle..misfires..spark plugs..fuel injector
I cant figure what is wrong with my 1999 slk 230 the check engine light popped on and it began shaking. It shakes in idle and also driving. The readings from the check engine light are P0300, P0301, P… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1999 C230 Kompressor: misfire..acceleration..gas pedal..the RPMs
Hello. I have a 1999 C230 Kompressor throwing the P0303 code for a cylinder 3 misfire. I've replaced spark plugs, wires, boots, and coils with no improvement to severely rough idle and NO acceleration… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
c230: 2.3l fuel trim..ask kik down (mist fuel, look like not end
C230 2.3l fuel trim malfuction appear after ask kik down (mist fuel, look like not end of full) ????… read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
8,789 satisfied customers
1999 Mercedes E430. Check engine light. PO170 and PO173.
1999 Mercedes E430. Check engine light. PO170 and PO173. Cleaned MAF, checked gas cap and gasket, checked vacuum leaks, use premium gas. Reset check engine. Car idles and drives good normaly. Yesterda… read more
david
david
Heavy Duty Repair Mechanic
Vocational, Technical or Trade Scho
495 satisfied customers
Intermittent OBD code P0170 [Fuel trim Malfunction]..vacuum..Injectors
I get intermittent OBD code P0170 [Fuel trim Malfunction]. I have replaced all the vacuum tubing but still get this P0170 code. Other info on P0170 says that it is caused by Injectors, Diaphram Pressu… read more
MB Paul
MB Paul
Mercedes Technician
Vocational, Technical or Trade Scho
3,567 satisfied customers
1991 Mercedes C230: CEL..MAF sensor..the air filter and I..air intake
1991 Mercedes C230 - Got CEL - Code is P0170 - I read there is a great chance this indicates bad MAF sensor. I recently changed the air filter and I read that air intake can contaminate the MAF. Since… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1999 E320: check engine light..lean..running fine..under load
1999 E320 had check engine light on for lean fuel trim but car was running fine in town. Now when under load such as going into passing gear light will flash and car will lose power and run rough show… read more
Rob
Rob
Diagnostic Technician
High School or GED
196 satisfied customers
The following diagnostic fault codes: &nbs p; P1519..Manifold..leaks
how much including labor will it cost to fix the following diagnostic fault codes: &nbs p; P1519 - Idle Air Control Valve Circuit Failure & nbsp; P0410 - Secondary Air Injection Syatem Failure, P0105 … read more
Rob
Rob
Diagnostic Technician
High School or GED
196 satisfied customers
Mercedes C320: an inspection sticker (I live in MA)..emissions test
Hi - I have a 01 Mercedes C320. Recently it was rejected for an inspection sticker (I live in MA). The cause of rejection was b/c it failed emissions test. These are the codes that the On-Board Diag. … read more
Your Auto Inspector
Your Auto Inspector
Assistant Service Manager
In course of study for bachelor's d
800 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x