Question about 1990 Mercedes-Benz E-Class

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I have a 1990 300e mercedes that will start but will only run for a few seconds then die? Does anyone have any suggestions on what it might be?

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The relay behind the battery. The one with 2 fuses on top. Change it:)

Posted on Dec 21, 2011

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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.

Posted on Apr 03, 2011

  • htvfd1134 Jul 24, 2011

    Mercedes from what I have read don't have MAF sensor's mine is doing the same thing and I've changed the fuel filter and still doing the same thing. Mine does it when its hot. As soon as I find out I will repost.

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1 Answer

Runs a few minutes, then dies and will not start again until the engine cools down - 1 hour or so.


There are a few things effected by heat that could be causing this. Crankshaft position sensor (if your car is equipped since Mercedes started using them sometime around 1991-1992), Fuel pump relay, fuel pump itself, ignition coil (s) and ignition control module (EZL). The only way to narrow down which one it is, is to diagnose the problem WHILE its not starting, so test for fuel and spark during those times and narrow it back from there.

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93 toyota pickup 4x4 it will stay running after I turn it on to start it up, it starts up then after a few seconds it kills


if I'm reading this right...
... the engine starts and dies within a few seconds.
... you jumpered the fuel pump test connector and it will keep running.
... you smell fuel after trying to re-start when it dies.

Disconnect the plug to the cold start injector. Even if you have an issue with the engine running then dying after a few seconds after doing this, if you don't smell fuel after disconnecting the cold start injector and try to restart it, the cold start time injector time switch may be failing.

Buy a can of starting fluid and have someone start the engine then spray short bursts of the fluid around all the intake fittings. If spraying the fluid in any particular area keeps the engine running, I'd start looking for leaks around that area.


It does sound like an AFM or COR issue considering it dies after a few seconds, but the fuel smell when trying to restart the engine may be a separate issue that needs corrected / isolated first.it will keep running.

... you smell fuel after trying to re-start when it dies.


Disconnect the plug to the cold start injector. Even if you have an issue with the engine running then dying after a few seconds after doing this, if you don't smell fuel after disconnecting the cold start injector and try to restart it, the cold start time injector time switch may be failing.


Buy a can of starting fluid and have someone start the engine then spray short bursts of the fluid around all the intake fittings. If spraying the fluid in any particular area keeps the engine running, I'd start looking for leaks around that area.


It does sound like an AFM or COR issue considering it dies after a few seconds, but the fuel smell when trying to restart the engine may be a separate issue that needs corrected / isolated first.

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If it starts and runs for about a half second or appears to run for that long then you probably just lost your key sync. Also happens when the remote battery dies on you. Look in your owners manual near the back or in the index for resyncing your key. It is easy to do and takes a few minutes or a few tries. Or you can spend about oh $200 for the Benz stealership to do it for you ;-]

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Alternator might be bad take it off and take it to an autoparts store they usally test it for free. Its obviously not getting enough power, check all the ground cables in the engine compartment. If anything try a stronger battery like Duralast Gold.

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First run a code check, see what you find. Second, you can do individual component testing with a decent volt/ohmeter to pinpoint problem. (instructions for tests in any decent manual)
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