20 Most Recent 1991 Mercedes-Benz 420 Questions & Answers

Mercedes electrickery is complex and can be temperamental, plus it could have an anti-theft system to further complicate matters. It is entirely possible your car has more than one fault and possibly more than two... Generally the fuel gauge and low fuel warning light has a separate circuit from the fuel pump even though mechanically they share the same space and could conceivably affect each other. I suggest you put your preconceived ideas on the back burner and go back to basics. Check fuses, check supply voltages, check in the vehicle handbook whether there is an anti-theft system and so forth.

yes, go to Autozone.com and register yourself. Dont worry its free. Click on manage my vehicles and punch in your car along with model and year then click repair info. go through the process and it will give you txt. and pics.you can print it out. Good luck!

Hi Mark. I was thinking the same type of problem. Either the fuel pressure regulator, a fuel leak or the fuel pump.

could be a boggle of things but lets start with basics first the gas tank debries in tank and filter clogged which when it cuts out the suction is lost and debries fall back to bottom of tank again dirty fuel sifon out and filter check for debriesbad thermo sensor it can cut off if stuck in positionloose wire from change in your plugs rotor cap might have hit a wire by accidentair filter clogged generator failing throttle body needs cleaningnow the more rough end the crank or cam sensors speed sensorbad ground now the 1991's were known for a burn out ground melting of the shielding around ground wires next to exhaust and hot areas of car this had been remedied by simple longer wire replacement and or new shielding added to wire

check the combination valve

For ball joints issue.Before replacing it,first inspect and test the ball joints to confirm the problem:----Click the help links below to troubleshoot the problem and replace the ball joints:----Upper Ball Joints inspection and replacement? http://howtobyme.blogspot.in/2012/02/upper-ball-joints-inspection-and.html How to Test Upper and Lower Ball Joint? http://repairhelpcenter.blogspot.com/2011/12/how-to-test-lower-ball-joint.html How to inspect Upper and Lower Ball joint? http://repairhelpcenter.blogspot.com/2011/12/how-to-inspect-lower-ball-joint.html How to Service Ball Joints on Car? http://repairhelpcenter.blogspot.com/2011/12/how-to-service-lower-ball-joints-on-car.html How to Replace Ball joints? http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-lower-ball-joints.html Lower Ball Joints replacing? http://howtobyme.blogspot.in/2012/02/lower-ball-joints-replacing-on.html----------This will help.Thanks.

Any signs of animals? It is possible they have been chewing wires.

Firing order is 1-3-4-2