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2013 Camaro 3.6 V6 31,000 miles. Fuel injectors failing. So…

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2013 Camaro 3.6 V6 31,000...
2013 Camaro 3.6 V6 31,000 miles. Fuel injectors failing.So heres what happened,I got a car in my shop couple weeks ago running rough. bring it in shop its dumping raw fuel out the exhaust. fuel pressure test shows 40lbs wont hold pressure bleeding back almost instantly.Remove fuel supply from fuel pump hook it up to motorvac supply same things bleeds off pressure almost instantly..
So weve at this point delineated that its not bleeding back into the tank and it is indeed the fuel injectors.We wait a week for Customer to give approval to replace fuel injectors.However we bring car after a week to work on it and this time its holding pressure. So we throw some spark plugs in it change the oil and i run it for 2 hours with the motorvac and cleaing solution. Car runs like its brand new other than a very slight roughness that was continuing to get better as we were gaining all the cylinder compression back.5 days later car comes back same original symptoms. Cant hold fuel pressure when car shuts off, etc. let it sit for a week still nothing.I want to make sure before i put six new injectors in it, that there isnt something else im missing.
Submitted: 10 months ago.Category: Chevy
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Answered in 7 hours by:
10/3/2017
Chevy Mechanic: Gary, ASE Certified Technician replied 10 months ago
Gary
Gary, ASE Certified Technician
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Satisfied Customers: 1,984
Experience: Senior Technician
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Hello! My name is Gary.
Welcome to JustAnswer.
I'm reviewing your question now, and will post back with a reply shortly.

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Chevy Mechanic: Gary, ASE Certified Technician replied 10 months ago

Hello there,

I have had a few cases where the high pressure pump on the back of the cylinder head leaks into the engine oil, then into the oil pan.

Engine runs rough, blows smoke etc.

Gary

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Customer reply replied 10 months ago
ok explain how that happens to me and why if I remove it from vehicle fuel supply it still is not able to hold pressure. If I'm going directly to fuel rail from external fuel source theoretically if the high pressure pump was bad the injectors shouldn't be bleeding down correct?
Chevy Mechanic: Gary, ASE Certified Technician replied 10 months ago

Does yours have petrol direct injection with a high pressure pump like a diesel?

Our Australian 3.6 has this.

Or is yours early normal port efi?

If it is early normal port EFI, then you must have one or more leaking injectors.

Gary

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