1994 Mercedes Benz E220 Repair Question
Difficulty starting in damp/wet weather and once running, it is misfiring and not running smoothly
Having investigated it, the HT leads appear to have been changed, but do not have service history.
The car has been taken to 3 different garages and has shown nothing on the diagnostic machines.
Please can you advise of the things that needs checking in terms of water getting into electronics or coils etc.
Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem. This has to be done to catch it
Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing
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