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Dan
Dan, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1395
Experience:  Dealer Auto Technician
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I have new intake manifold and new cam sensor it still

Customer Question

I have new intake manifold and new cam sensor it still cranks but wont start no check engine light on
JA: Does the light stay on, or does it blink?
Customer: its like normal when you turn key it comes on then goes off
JA: What is the model/year of your Mercedes?
Customer: 2007 e350
JA: Are you fixing your E350 yourself? What have you tried so far?
Customer: yes. have replace intake manifold, changed oil and all filters, new cam sensors
JA: Anything else you want the mechanic to know before I connect you?
Customer: that's it
Submitted: 3 months ago.
Category: Mercedes
Expert:  Dan replied 3 months ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.

Expert:  Dan replied 3 months ago.

You need to figure out which of these you do not have. Spark, fuel, compression

Check spark first, then fuel pressure, injector pulse and finally compression. If it is cranking then its not a security issue.

Expert:  Dan replied 3 months ago.

Please reply to this if you need more help and we can continue this conversation. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. If I am not giving you 5 star service, please let me know what I missed.

Thanks,

Dan

Customer: replied 3 months ago.
I have check all i.e spark,fuel, injectoe and compression. All are good. Still cranks but no start.
Expert:  Dan replied 3 months ago.

Have you scanned for any codes?

Customer: replied 3 months ago.
I had some poo17 an 16 before repacing sensors. Replaced those and reset computer bacl to factory. I dont know what else to do
Expert:  Dan replied 3 months ago.

Those codes can set if the mechanical timing is off as well. You may have a timing chain problem. If the cam and crank sensor signals do not match up the computer will not allow it to start.

Unplug cam sensors and try to start it.

Customer: replied 3 months ago.
Ok. Just got a p0455 code
Customer: replied 3 months ago.
Also check engine light came on while driving. Driving me crazy. Cant figure it out.
Expert:  Dan replied 3 months ago.

p0455 will not cause a no start. Check engine light came on while driving? I thought it didn't start.

Customer: replied 3 months ago.
No it cranks and will start sometimes others it will crank but no start
Expert:  Dan replied 3 months ago.

It is possible you have a fuel pump issue, I have seen this before, sometimes start and then not start. The pump could be on its way out. This would cause your issue.

Customer: replied 3 months ago.
Thought about that but how can i tell for sure?
Expert:  Dan replied 3 months ago.

Connect a fuel pressure gauge and tape it to the windshield. Drive it around until you can get the no start to occur and see what the pressure is.

Expert:  Dan replied 3 months ago.

You can also listen carefully for the fuel pump buzz in the tank.

Expert:  Dan replied 3 months ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated.

This question is coming up on 7 days which means it will time out and close.

You have already paid to get this question answered, but you have not rated.

Let me help some more. Is there anything else I can help you with?

If I did not give you 5 star service, please let me know what I missed.

I do not get compensated for my time and resources unless you rate me.

Thanks