Second opinion] Sure why not
Responses
Customer
345 days ago
Let’s see if something else has a better ideaI ordered the BG fuel cleaner
Daniel Chaidez
345 days ago
Good evening, my name is \*\*\*\*\* \*\*\*\*\* ill be helping you, so sorry to hear about the issues here on the Smart. Now what codes was the dealer able to pull up when it came in?
Customer
345 days ago
All the service advisor said was old misfire on all three cylinders
Daniel Chaidez
345 days ago
okay thank you, \*\*\*\*\* \*\*\*\*\* was done at the dealer?
Customer
345 days ago
Replaced all three [spark plugs](/topics-spark-plug-mercedes/)
Daniel Chaidez
345 days ago
and that was it?
Customer
345 days ago
Got recommended to run BG fuel cleaner. Thoughts?Yep 400 buck for three plugsCheck engine light came back the next day
Daniel Chaidez
345 days ago
if we are still misfiring after the new plugs it does sound like itll be fuel related to me, the fuel cleaner is a good idea but i do not think itll solve your issue. i would recommend we get fuel pressure tested to ensure the pump is healthy and working correctly and after that also look into the position sensors and ensure they are reading correctly. the fact that its intermittent makes it harder to narrow buts that where i would start.
Customer
345 days ago
What would normal foul presume be and do you think a normal Mech can perform or should I go back to MercedesSorry normal fuel pressure be?
Daniel Chaidez
345 days ago
i would try and find a local automotive shop that has experience with Mercedes if we can, if not itll need to be the dealer
Customer
345 days ago
Ok thanks I just hate wasting money on the dealer when they are guessing instead of being the experts. The service advisor told me that the plugs should be replaced every three years no matter the millage and that just did not make sense. If it was carbon why would restarting let the car run as normal? Intermittent issues are the worstThanks for thinking about it
Daniel Chaidez
345 days ago
correct, the fact that its intermittent makes me suspect an electronics issue or fuel in that order. this is why independent shops are better since they dont have the luxury of guessing. im glad to have helped!
Still not sure what you need?
Have a certified mobile mechanic diagnose what's wrong with your car, at your home or office.
Top Questions
Trending Topics
What others are asking
My car won't accelerate in drive. But will accelerate in park or reverse. The last couple of days. While driving the battery ligh
You may have a defective transmission valve body or the transaxle is bad internally. The manufacturer recommends replacing the valve body assembly first and then the complete transaxle if the problem is still happening. I suggest having you transmission tested...
Car stops slower & brake pedal goes to floor
Sounds like you may have some internal leakage in the brake master cylinder. The brake master cylinder, if it is leaking internally, will maintain fluid level and allow the pedal to drop. It is possible that the leak is small...
Trying to determine if a Honda 2005 vtec (D172A) sohc, 127 hp has an O2 upstream sensor problem or the ECU
Hello. From what you describe it would appear that your upstream oxygen sensors (https://www.yourmechanic.com/services/oxygen-sensor-replacement) are causing the issue. If you disconnect them and the vehicle runs better then it may very well be possible that the signal they are sending...
No sound from speakers but the dash panel works
Hi, thanks for writing in. This is likely an issue with the audio control module which controls the output to speakers and any pre-amp controls. I recommend having one of our certified automotive technicians from YourMechanic come to your home...
Sputtering Volkswagen
Hi there: A sputtering engine is typically caused by fuel or ignition system failures. However, there are more than 20 individual parts that could be dirty, faulty or have electrical wiring issues that can contribute to your 2005 Volkswagen engine...
Loud chirping from valvetrain
Hello, thank you for writing in. There are several causes for low compression. It was a great idea to test all cylinders. With only having low compression in one cylinder, the issue is likely an exhaust valve. The vehicle should...
During ignition Taurus gagged for air, then backfired w/ smoke. Now engine light stays on & runs rough(timing off) 2005 Ford Taurus SE
Hello - the first task is to check for the problem codes which are setting the Check Engine light. This may be helpful in identifying the initial problem as well as the current problem(s). Usually, backfiring (https://www.yourmechanic.com/question/car-backfiring-and-spitting) in the intake...
Fuel smell
This is likely related to your EVAP emissions system and something called a purge valve solenoid. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel...
When releasing my clutch in first gear, it stutters and vibrates the car.
It's probably clutch related, for example due to worn out friction material and/or a pressure plate defect BUT it's also possible that the motor mounts could be implicated and the engine as well if the engine is bogging down (due...
Browse other content
Services
Cities
Second opinion] Sure why not Mechanic's Assistant: What is the make/model/year of your car? 2015 Smart Fortwo Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? I tried taking...
Second opinion] Sure why not Mechanic's Assistant: What is the make/model/year of your car? 2015 Smart Fortwo Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? I tried taking it to Mercedes and 400 bucks later still have the same problem Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? Check engine light and loss of power if I stop, turn the car off and then restart it runs fine but the check engine stays on