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I HAVE A 2002 MERCEDES BENZ. I HAVE BEEN HAVING SOME PROBLEMS WITH IT DYING. IT ONLY DOES IT ONCE IN A WHILE. ALSO WHEN I DRIVE IT AFTER I SHUT IT OFF I CAN'T START IT FOR ABOUT 15 TO 20 MINUTES. ANYWAY I TOOK THE CAR TO THE MACH. AND IS TELLING ME IT IS MY FUEL PUMP. I KNOW ITS NOT THE FUEL PUMP BECAUSE I JUST HAD IT REPLACED 5 MONTHS AGO. ANOTHER PERSON SAID IT COULD BE MY SENSOR. I WAS JUST WORDERING IS MY MACH. LYING OR COULD IT BE MY FUEL PUMP?

2006-08-31 05:09:30 · 17 answers · asked by Stephanie 3 in Cars & Transportation Maintenance & Repairs

17 answers

This is a tough one. That car has a lot of electronics on it that could help in diagnosing the problem. Does your mechanic have the tools to check it? If it dies and re starts I would look more for electrical problems. Is something losing ground and causing the fuel pump to stop? Is the cam sensor losing power and that also shuts off the pump. Your tech may be correct and you may have a defective fuel pump. As you can see it could be lots of things.
The shop you take it to how up to date are they? Do the work on lots of late model Mercedes? Not starting for 15 or 20 minutes when hot would lead me to believe its a sensor or relay that is over heated. IS THIS THE SAME PROBLEM YOU HAD BEFORE?
I know that this is not the answer your looking for but make sure the shop you are going to has stayed up to date. Cars are much more electronic now and fixing them can be tricky. Last since you did not say what model it is the six cylinder cars have had problems with air flow sensors that could also cause some of these problems again that is something that would show up on a good diagnostic tool.

2006-08-31 05:25:10 · answer #1 · answered by uthockey32 6 · 0 0

A 2002 Mercedes? Yes, second opinions are mandatory nowadays. The first mechanic could be correct and the second one took your money? Take it to a third Mechanic, preferably an Authorized Mercedes Benz or Bosch Mechanic and move onward from there. The fuel pump is a Mechanical Device and should have been covered under some kind of warranty. But that was then. Unless first mechanic is Authorized Mercedes Tech.
Soundss like that car needs some serious tuneing and adjustments that only an Authorized Mercedes Technichian would have the tools and training to effect.

2006-08-31 12:27:40 · answer #2 · answered by Anonymous · 0 0

I had a Dodge Dynasty several years ago that did something similar. It would just die after driving for about 15 miles. Then, after 30 minutes or so, it would start up and go. I had it in the shop four times. Each time, they replaced some part. Some sensor was replaced first, then the fuel pump, then something else. Nothing worked! Someone told me that it was probably the vehicle’s computer. So, I took it to the dealership. They said unless it was acting up when I brought it in, they wouldn’t be able to find the problem. I was usually out on the highway when it died. By the time I had it towed in, it started right up. It was really frustrating! I finally got rid of it.

Anyway, to answer your question: Your mechanic is not lying, he’s probably just guessing.

2006-08-31 12:41:48 · answer #3 · answered by AugustMan 3 · 0 0

it is possible that the fuel pump you just had replaced is faulty, but if so it should be under warranty. considering this is an ittermittent problem it will be difficult to diagnose. if you have a good mechanic he will check all other possibilities before heading to the most lucrative(fuel pump)it could be ignition coils or switch, loose wiring somewhere in the powertrain control module, fuel deliver system, bad ground wiring etc.its hard to say with the symptoms you described but if its doing the same thing it was doing when you initially had the pump changed id say probly something else.

ase certified auto tech six years gm experience.

2006-08-31 12:19:48 · answer #4 · answered by motorman19780 2 · 0 0

I could be either; I had a similar problem recently with my Escape. At first, we thought it was the RPM gauge, whcih could have been defective. But it turned out to be a combination of the fuel valve not feeding enough O2 AND the computer having a short. Also, there was a loose wire along the line which caused the vehicle to give out, especially when parking.

If you have extended coverage, it should cover most of any issues. If not, it's always best to get a second opinion. Is the mechanic from your dealer? That's usually the best one to go to. i say usually, not always. At any rate, good luck.

2006-08-31 12:15:50 · answer #5 · answered by QuackJak 4 · 0 0

It could be the fuel pump or almost anything else. The point is that if you don't/can't trust your mechanic you need to go somewhere else to get a second opinion. Choose a shop that's familiar with your brand of vehicle, preferably ASE certified and that warrants their diagnosis and work.

2006-08-31 12:14:15 · answer #6 · answered by Anonymous · 0 0

drive around different machenics and check, roam around the city, there are thousands of machanics, go shop for the best deal...hehehehe

but i really do suggest bring your BENZ or Any car to only the authorized service centre, yes they r little bit more expensive but your car will be in good hands...Benz 2002 means you should take it to Mercedes Benz Service centre, no matter what safety and comfort is what we always want.

2006-08-31 12:19:00 · answer #7 · answered by Jendralus 5 · 0 0

Mechanics are like doctors. Unless you are confident in the person who is working for you, you'll have to get a second opinion. Ask your friends, coworkers, anybody to refer to you to a mechanic that is truly trustworthy. That way you can compare your diagnosis and determine who's telling the truth.

You know, I guess it could very well be a sensor that's affecting your car.

2006-08-31 13:03:02 · answer #8 · answered by Nestor Q 3 · 0 0

It maybe your pump, check to see if the previous work carried out was under waranty. If the work was not under waranty then the part should be. At least then the mechanic can replace the part without charging you for its replacement.

Try phoning the mechanic as a new customer and asking if any work carried out would be covered.

If that fails you can report his shoddy work to trading standards:

http://www.tradingstandards.gov.uk/

2006-08-31 12:17:39 · answer #9 · answered by Wilf 2 · 0 0

It would be your cam sensor for sure. When the engine light comes on, take it down somewhere and have it hooked up to a machine that will tell you. Most places won't charge you. I believe it is your cam sensor most likely.

2006-08-31 12:19:37 · answer #10 · answered by just4fun20034 3 · 0 0

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