Question about Cars & Trucks

1 Answer

Mercedes benz S420 W221 2007 having hard start, Ive change the fuel rail with the sensor, the pressure pump, and norssle

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 76,682 Answers

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 02, 2012

Ad

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 11 Answers

SOURCE: '89 benz 300e, hard to turnover when starting, fuel pump/filter?

Run some Sea Foam Through it you tube sea foam It works

Posted on Apr 27, 2009

csmock132
  • 4669 Answers

SOURCE: 1995 buick riviera sc won't start changed fuel pump ,

Have you checked for injection pulse or compression. Will it start if you spray carb cleaner in the intake?

Posted on May 05, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Mercedes Benz 2002 - C240 - wont start.


Most parts stores will have a fuel pressure tester available. This is the best place to start, as presence of fuel at schrader valve does not tell you if pressure is correct. Hate to say it, but without proper test equipment you will have bad luck trying to troubleshoot newer cars. For spark, use a timing light, or a cheap inductive spark checker pen. I got my last one for less than $5.

Jul 25, 2016 | Mercedes-Benz C-Class Cars & Trucks

1 Answer

I kept getting a brake light signal,and had rough idleing when I started the car.Why wont my Mercedes 1997 S320 start ?


brake light is prob a bad bulb somewhere , totally seperate from the running problem , get your fuel pressure checked on the fuel rail not sure but should be about 40 50 lbs if not then your fuel pump is prob bad and it is in the tank

Nov 25, 2014 | 1997 Mercedes-Benz Mercedes Benz S Class...

1 Answer

Mercedes 220cdi 1999 starting problem


Could be a loss of fuel pressure when stopped . fuel pump stop valve letting fuel back to the tank or faulty fuel pressure regulator at the fuel rail letting fuel return to the tank.

Apr 11, 2014 | 2006 Mercedes-Benz E-Class

1 Answer

My low pressure fuel pump on my e270cdi cut out under high load conditions.no pressure from the rear.all fault codes tell me the rail pressure is to low


Fuel pump relay is in cavity A in the rear SAM ( Signal Acquisition Module.) on the left hand side of the trunk behind a door.

When did you check the voltage..... you must read it while cranking or you will get a zero voltage reading.. The low pressure tank pump builds pressure to the high pressure pump and then shuts down until a pressure drop is sensed in the low pressure line and it then starts up again.

If rail pressure is too low, it often is the high pressure pump in the engine or the relief valve in the fuel rail. The tank pump is low pressure just to stop the tandem pump from cavitating by sucking too hard.

Mercedes can check the rail pressure and do an injector pressure drop to rule out a leaking injector.

If the tank pump is bad it will require replacement.

Oct 20, 2013 | Mercedes-Benz Cars & Trucks

1 Answer

What does p2047 mistake means on mercedes benz e class 2004 year/


DTC P2047 Injector fuel supply rail pressure volume via volume control valve- rail pressure too low.
Poss causes1. fuel filter blocked (even Partially)
2.kinked or damaged fuel lines
3.worn fuel pressure pump
4.faulty pressure relief valve
5.blocked tank breathing circuit

Jul 03, 2012 | 2004 Mercedes-Benz Mercedes Benz E Class

1 Answer

My '99 S420 Almost stalling when starting in the morning very frequent when its on idle, if i drove it fiht away it will stall while driving. Please help


Check that the MAF sensor next to the air cleaner box on the ducting is clean (electrical cleaning spray and allow to dry), that there are no air leaks with regards to vacuum lines to the inlet manifold etc. and that the throttle body interior is spotlessly clean (wipe out with cloth dampened with WD40). If that does not fix it then have the diagnostic codes read, good idea to that anyway. Could be a pile of things: coolant sensor error or bad fuel delivery - duff pump, blocked fuel filter, compromised fuel pressure regulator but the code will help.

May 12, 2011 | Mercedes-Benz S-Class Cars & Trucks

1 Answer

What is the fuel pressure specs for a 1992 merc.benz 400 se 4.2l


At the fuel rail 60 psi at start up 40 psi when running is minimum. But remember that the fuel pressure regulator, fuel filter and fuel pumps can all effect this pressure.

Jun 08, 2010 | 1992 Mercedes-Benz Mercedes Benz 400 Class

1 Answer

Hi i've a 95 c280 benz.the car dont start.


you said fuel rail has pressure , why do you want keep checking fuel system?
check ignition , and if no spark present check reference sensor(crank position sensor) , if it's bad you won't get spark or fuel.

Apr 29, 2010 | 1995 Mercedes-Benz C-Class

1 Answer

FUEL RAIL PROBLEM


hello,fuel rail pressure sensor located at the rear end of railing tube which all high pressure line up to injector nozzle is connected, ignition off then you can remove that part,ty

Apr 25, 2009 | Mercedes-Benz E320 Cars & Trucks

4 Answers

1997 mercedes benz E320 acceleration problem


You may also have issues with your air flow meter.Generaly though this symptom is usualy a fuel pressure problem.This test may or may not work depending on wether the fuel rail is the problem or the pump.Squeeze the fuel return line at the back of the fuel rail and if engine improves the fuel pressure regulator on the fuel rail may be faulty.If no improvement its likely the pump.The best and most accurate test would be to use an inline fuel pressure tester.Can you hear the pump pumping up to pressure when you turn the ignition on?Usualy though the pumps fail but can be heard running but unable to maintain pressure.

Nov 29, 2008 | 1997 Mercedes-Benz C-Class

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

151 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76682 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...