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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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C280: 1995 Mercedes c280. Starts "slow" when warm. It cranks

Customer Question

1995 Mercedes c280. Starts "slow" when warm. It cranks and fires but sounds like it's has to build momentum to get up to full idle. This is very much unlike how it starts when cold when it almost explodes to life.
The car sat for a week when I was out of town an it took many 15-20 second cranks to get it started. Almost like the fuel lines went dry and it had to build pressure. It started slow this time too although it was very cold.
Submitted: 1 year ago.
Category: Mercedes
Expert:  CHRIS ZAPANTIS replied 1 year ago.
Hello I Chris and I will assist you. Let me know when you are ready.
Customer: replied 1 year ago.
Ready
Expert:  CHRIS ZAPANTIS replied 1 year ago.
Is the check engine light on?
Customer: replied 1 year ago.
No. I have had 2 engine lights in the past that were vacuum leaks.
Expert:  CHRIS ZAPANTIS replied 1 year ago.
Havw you cleaned the throttle body?
Customer: replied 1 year ago.
I wiped it out about 20,000 miles ago but didn't remove it to do it.
Expert:  CHRIS ZAPANTIS replied 1 year ago.
You have to get it good but theres no reason to remove. Ide also pull the plugs to check them.
Customer: replied 1 year ago.
What about the really hard to start after sitting a week, similar root cause as slow start?
Expert:  CHRIS ZAPANTIS replied 1 year ago.
I suspect that may be a fuel pressure issue.
Expert:  CHRIS ZAPANTIS replied 1 year ago.
But i would heck plugs and clean TB first to see what happens.
Customer: replied 1 year ago.
What is likely culprit? Pump, reglator, O rings on injectors? What is best way to test?
Expert:  CHRIS ZAPANTIS replied 1 year ago.
Most likely culprit would be the pump.
Expert:  CHRIS ZAPANTIS replied 1 year ago.
or a bad injector that bleeds down. Regulator and o rings no way.