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Ask Lou P. master tech Your Own Question
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 4149
Experience:  15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.
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Mercedes s550 thump in trunk no start
, while

Customer Question

mercedes s550 thump in trunk no start
JA: Thanks. Can you give me any more details about your issue?
Customer: while attempting to start a thumping sound in trunk for one second nothing else
JA: OK got it. Last thing — Mercedes Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Lou P. master tech replied 1 year ago.

HELLO, it sounds like to me the fuel pump may be at fault, how did this all happen? did the car stop running on you one day or did it just not start?

Customer: replied 1 year ago.
No Crank either
Expert:  Lou P. master tech replied 1 year ago.

oh, ok, so does the thump noise happen everytime ?

Customer: replied 1 year ago.
Expert:  Lou P. master tech replied 1 year ago.

ok, do the dash lights come on? can all the accessories work?

Customer: replied 1 year ago.
but not the air shock (lift the car)
Expert:  Lou P. master tech replied 1 year ago.

ok, those wont work until the car is running, hmmm, you have a good one, is there a way you can video the noise and upload here ? or make a youtube video?

Customer: replied 1 year ago.
Sounds like a relay, no code from CarMD
Expert:  Lou P. master tech replied 1 year ago.

ok , carmd only checks the engine control module and will only read current emissions codes. that scanner is ........ well not the best for anyone. a relay would not make a thump, it would make a small click unless it was the trunk lid latch.