Hi does anyone know what I can possible change to fix the problem I'm having.
I have already changed out crankshaft sensor, fuel pump relay, fuel filter.
I started with fuel pupm relay didn't solve problem then fuel filter seemed to solve problem for 1 week then car continued to die out and sometimes not crank thus causing me to change the crankshaft sensor... Car has worked great for 4 weeks now it started not cranking up unless I turn key and it trys to crank then stop and pump gas then crank pump gas then crank pump gas and it hesitates and coughs then it cranks rpms go to 15000 then drop back down to normal rpm of 6000 car runs great until shut off and then to start up again have to repeat the turn ignition and pump gas routine. Can anyone suggest what may be going on thanks
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I assume no check engine light while running? Pumping the gas on any fuel injected car does nothing if it's not running or being cranked so you can eliminate that from your routine. Check the fuel pressure regulator; remove the vacuum hose to it and see if there's any trace of gas in it, if so replace the regulator.
Thanks for your reply. Apparently the fuel pressure regulator is inside the fuel filter so it should be new since we had that changed out already they also put a new fuel pump and replaced the new crank shaft sensor that was just replaced less than 30 days ago and now it still does the same thing so now we have a new crank shaft sensor a new fuel pump a new fuel fiter new spark plugs what possibly can we do next the check engine light finally came on but till yesterday the computer gave no faultcodes. Do you have any other possibilities? Thanks
I didn't stop to think that car doesn't have a vacuum regulated fuel pressure regulator. The symptom is typical of a flooded engine and a leaking reg. is a common cause. I'm at a loss, but if something strikes me I'll let you know.
If the dealer charged you to diagnose this exact fault and came up with nothing you should go back to them. They owe you a useful diagnostic or your money back.
When I went to Mercedes they said there were no issues wrong with the car and charged me $120.00 diagnosis but since check engine light was not on I had no fault codes
I understand. IF the check engine light is now on , maybe , rather than bringing to the dealer , you can get a generic code reader and post the code(s) here. Other thing that may be helpful , next time it won't start , do you have any way of VERIFYING if it has spark? (safely!)
Thanks for your reply. Apparently the fuel pressure regulator is inside the fuel filter so it should be new since we had that changed out already they also put a new fuel pump and replaced the new crank shaft sensor that was just replaced less than 30 days ago and now it still does the same thing so now we have a new crank shaft sensor a new fuel pump a new fuel fiter new spark plugs what possibly can we do next the check engine light finally came on but till yesterday the computer gave no faultcodes. Do you have any other possibilities? Thanks
I didn't stop to think that car doesn't have a vacuum regulated fuel pressure regulator. The symptom is typical of a flooded engine and a leaking reg. is a common cause. I'm at a loss, but if something strikes me I'll let you know.
Thanks as a last resort we are going to try replacing cam shaft sensor I'll let you know if this works
If the dealer charged you to diagnose this exact fault and came up with nothing you should go back to them. They owe you a useful diagnostic or your money back.