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Re: engine will not start
Ecm/pcm. i have replaced mine twice in the lifetime of my truck. i have a 1990 gmc suburban. the pcm controls both. it only cost about $90.00, but b4 you do that check all of your grounds. i have seen that when there was a main ground that was loose or corroded everything would power up, but it wouldn't start/run.
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Don't know what that switch would be, but sudden no starts are usually fuel or ignition spark related-one of them is not getting to the cylinders. See if you have a strong blue spark on a spark plug wire. If no spark, possibly a bad ignition coil or a bad TFI module on the side of the distributor.
If you have spark, see if pump is putting gas up to the engine.
I would check for spark first with a spark plug tester. They are about $10 bucks and very easy to use. Then check all spark plugs for massive wear, and then check all spark plug wires for breaks or burn holes from motor. If not any of these, then I would check to timing belt. Once you diagnose these things, get back to me and we'll go from there. Good luck. P.S. Did the check engine light ever come on?
Sound like there is no gas or little enter the engine.
-Check gas presure and any gas in the carburator? Yes. The internal pump is won out. Need to replace it. Q: Where is the internal pump...? A: It's inside the carburator. (It looks like the toilet plunger) You can't see untill the cover has been remove.
Check for spark at the plugs. If you have spark try putting very small amount of gas/starting fluid in the carb, if it starts its a fuel problem. check fuel filter and fuel pump. If no spark check coil.
It's the Check Engine LLight. Your truck should be checked by a Mercedes Benz technician using Star Diagnosis computer. If impossible, you can try by checking the emission parts, like gas door, air filters (2 of them), spark plugs (12 of them, yes, twelve, two plugs per cylinder), catalytic converters, gas filter.....