Top 20 1990 Mercedes-Benz E-Class Questions & Answers


Sounds like a warped head take to a mechanic have a compression test done. DO NOT USE ANY GASKET SEALER

1990... | 68 views | 0 helpful votes


First start with the basics check fuses relating to fuel and or injectors make sure there is voltage next look into your crank sensor usually if it fails the computer doesn't know you are trying to start the vehicle because the signal the sensor is supposed to give out to the computer is not there due to a faulty sensor once the computer senses the signal from the crank sensor then the computer will send a command to the injectors to start pulsating gas let me know how this turns out for you.
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1990... | 89 views | 1 helpful votes


Check the starter motor and its solenoid switch

1990... | 133 views | 0 helpful votes


The marks indicate shift points.

1990... | 36 views | 0 helpful votes


Use the yellow bottle of HEET dry gas to rule out water in fuel

1990... | 85 views | 0 helpful votes


Check the Fuel Pump Relay. behind the battery next to the OVP Over Voltage Protection Relay. They do fail. Occasionally the engine will not start when hot. This becomes more frequent until you are left stranded. If you are comfortable with jumping two terminals you can jump terminals 7 & 8 test the relay. if the car starts your Fuel pump relay is bad.

1990... | 52 views | 0 helpful votes


try benzworld.org or peachparts forum

1990... | 120 views | 0 helpful votes


defintly a valve,regulator or gas line leak,or injector leaking rail pressure

1990... | 125 views | 0 helpful votes


the main switch is bad replace main switch

1990... | 24 views | 0 helpful votes


Reading from the O2 Sensor

1990... | 55 views | 0 helpful votes


We have no repair manuals here at fixya. You can pay to access them here

1990... | 365 views | 0 helpful votes


trial and error. Look at it like a puzzle. Takes time to get that sweet spot.
I wish everyone here was in houston.

1990... | 37 views | 0 helpful votes


There are fuelpump relays for electric fuelpumps. You can have a bad fuelpump with either a mechanical or electric pump. You can have a clogged filter.

You can try Autozone.com and register your vehicle for free. Then you can get wiring diagrams and fusebox diagrams for the electric relays. Then you can find out which system you have.

It certainly sounds like you are on the right track since you discovered its a fuel problem.

1990... | 122 views | 0 helpful votes


The blower motor fuse is located On the left front shock tower ON USA versions. It is inside a small plastic housing

1990... | 363 views | 1 helpful votes


If you are looking for the evap temperature sensor it is located in the evaporator housing

1990... | 76 views | 0 helpful votes


Thats a classic old motor ,wonder it hasnt rotted away by now anyway your relays if i remember rightly are in a power distributioin box under the bonnet at the back left hand side on a LHD vehicle

1990... | 126 views | 0 helpful votes


simple enough job to change but check the drive in the gearbox first in case the nylon gears have failed or the square drive ,but normally this sort of failure is due to a tight inner cable but check them anyway as you renew the cable

1990... | 185 views | 0 helpful votes


before you get a new ignition switch you might want to check the starter relay in the fuse box and make sure that it isn't sticking, then check the wiring of any recent modifiactions (if any) to make sure that none of the wires are running off of the alternator charge curcuit this will cause the engine to run itself.

1990... | 114 views | 0 helpful votes


I don't know much about Mercedes, but that is exactly what most other vehicles will do when the MAF(mass air flow sensor) is faulty. It's always a good idea to find one at an auto wrecker, and try it. Or the fuel filter clogged? Hope this helps.

1990... | 212 views | 0 helpful votes

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