C230 W202 1997 Auto Sport wont start

ds24215605

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Problem: Car was running fine then in the morning came to start it - car wont start.

Actions taken so far by myself. Did the usual visual checks,nothing seemed out of place.

Called AA Home Start.

Actions taken by AA (Who were very thorough) to narrow down what the issue is:
1. Check fuel delivery - pump priming up and running.
2. All fuses in fuse boxes ok.
3. Fuel pump relay ok.
4. Check switching at injectors - ok.
5. Check key fobs remote working ok.
6. Car has fuel in tank.
7. Check for HT spark at plugs - ok.
8. Found that the plugs were dry like the injectors not opening?
9. Car would start if fuel manually fed into carb, albeit only for a short burst until fuel was used.

Unfortunately he didn't have a diagnostic checker to fit the car :-(

Anyone any suggestions what the issue could be, or come across this problem before. I am reluctant to have it transported into a Mercedes Garage for expensive diagnostics.

Conclusion. Is it the fuel pump not building up enough pressure to pump fuel into the injectors? I have only a limited knowledge of DIY on cars, the notes i have typed up from the AA Report.
 

robparker

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Did the AA man tell you it had a carb ?
 

LostKiwi

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Did the AA man tell you it had a carb ?
Yeah my thought too!
You need to measure fuel flow and pressure. Just because the pump runs doesn't mean fuel is getting to the engine.
 
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ds24215605

ds24215605

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Sorry my terminology re carb. Noted re the fuel flow. How do i check it?
 
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ds24215605

ds24215605

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If i bought a new fuel pump would that resolve the issue?
 

robparker

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Only if the fuel pump is faulty
 

LostKiwi

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Could be many things. Really needs to go on STAR to see what's going on.
 

silestanix

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As above, get it to a STAR machine, throwing parts at it will not solve the issue mate.

Trust me, a lot of us know from experience. Good luck!
 
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ds24215605

ds24215605

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Ok the story so far.

1. Fuel going through to the front of car i took of the fuel pipe and checked.
2. Looked in the boot and checked all wiring, found some aftermarket wiring that goes from the unit shown in the picture to the fuse pump relay. reconnected that temporarily just to ensure its not that.
3. Renewed the Fuel pump relay fuse 30 amp in the boot of car.
4. power going to fuse pump relay ok.


Can anyone tell me what the small box with wires coming from it to the pump relay on top of the battery is?

Car still wont start - local Merc dealer doesnt have a STAR machine that will fit due to year. Round pinned type under bonnet.
 

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ds24215605

ds24215605

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Update - it was the tracker which is now removed. :-0

still wont start

Fuel pump and filter next.
 
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ds24215605

ds24215605

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Anyone any idea where the immobilizer is on the car?
 

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