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Mercedes C320 02 cranks but wont start well sometimes This just started starts fine for days and then it only cranks Will fire with starting fluid so you have spark?
I'm not familiar with, and don't have any experience with your vehicle, but the key clue in your question is that it will "fire" when applying starting fluid.
This clearly indicates that the problem is that fuel is not getting to the cylinders. There could be many causes for this, and without being able to do a "hands on troubleshooting" of your vehicle none of us on this site can tell you what that specific defect is.
Here are some of the things I can think of that could cause fuel starvation:
- Leaks in fuel system allowing air in which can inhibit fuel flow,
- Pinches or kinks in fuel lines or hoses which cut off fuel flow,
- Blocked fuel filter, or filters,
- Fuel pump, or pumps, not working,
- Clogged filter screen in fuel pickup line in fuel tank [s],
- If a carbureted vehicle, float valve stuck closed,
- Small passages [called "galleries"] inside the carburetor clogged/blocked,
- If a fuel injected vehicle, the electronic control defective not allowing fuel to pass.
There are probably other causes which escape my mind right now.
What else can I help you with?
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