Quote:
Originally Posted by 1974450sl
1974 450sl
I replaced the belts and accidently sparked a wrench against possibly the alternator before disconnecting the battery. When I buttoned it all up the engine cranks, fuel pump works, provides fuels from the smell, and spark plug is emitting a spark. It ran for about 2 seconds then died. Never started up again after that.
The battery is fine. The coil seems to be fine with checking the resistance with a multimeter. The fuel pump comes on and pumps gas. I suspect it might be:
1. a blown fuse - the ones under the dash on passenger side looked fine
2. another fuse box for ignition system - not sure when it is located?
3. Engine Control Unit (ECU) module
4. Electronic Ignition System (EIS) module
5. Fuel Relay switch - no idea where this is located?
I value any feedback and help please?!
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Step 1) Ensure that there is spark at the spark plugs. Remove a lead from a spark plug, insert another plug in the lead, lay the plug on a metallic part of the engine, crank the engine. Is a spark visible at the plug?
If not, repeat the exercise with the coil lead removed from the dist. cap, but still in the coil.
Before any attempt to diagnose the fuel system, it is necessary that there be no question about the ignition.