Does anyone know how to relieve the fuel pressure in a GDI motor?

I need to pull my injectors to send them away for cleaning and inspection. The dealer told me I have a failed injector after sitting over the winter.

Does anyone know how to release the high fuel pressure in a GDI motor? The service manual says there is a procedure for this in the diagnostic tool, but I'm sure there's another way to do it.

 

Thanks. That's exactly what the Bosch instructions for GM say. For BMW and MINI Bosch says tap an injector with a spanner wrench to remove pressure, which seems crazy.

The WSM just says "remove the rail with injectors complete from its seat." That sounds easy but maybe not. I guess for backup my buddy is a Mercedes tech and use to be Lotus and Lamborghini. He says he deals with the Mercedes GDI system which I'm guessing uses Bosch parts?

They just pull straight out but are stuck in there pretty good?

It's a 458 with a cylinder 3 misfire.

 

It's a coupe. I'm 90% of the way there. I'm at the step in the WSM where the two harness brackets on the front of the intake need to be removed. I decided I needed to order a magnetic 5MM ball hex bit before removing the bottom bolts. Tops are out. I've also removed 15 of the 16 bolts holding the intake down. Just the front right remains but I need to remove that bracket to access it.

Plan is to send both injector rails to Injector Rx for inspection and cleaning. Good idea?

 

They say they can now replace individual injectors as Ferrari has supplied the tools needed to do that. I was quoted $500-600 for an injector or $4,800 for the entire rail. I know the price is around $2,000 from Eurospares.

Do you have the Ferrari DEIS software? I was told they need to input numbers off the individual injectors when they change them, although the WSM is silent on this. My Mercedes friend told me their diagnostic software has the same procedure. This is why I was going the cleaning/testing route first.

Injector Rx told me they do this all the time for the race teams and Ferrari of Houston and my problem sounds familiar. Seems odd for a 2,500 mile car though.

 

Interesting. Sorry what do you mean by "reset the adaptations?" Is that something you can do with my Launch diagnostic tool?

 

Ok thanks. If you ever need fob programming or PIN retrieval for the 90's through 2000's cars I owe you....

 

It's really only the dealer that's saying it. My car ran perfect before winter storage. I only drove it maybe 50 miles but it was amazing. It then sat at a detailer waiting for clear bra and we had an unexpected snowfall and salt on the roads, so I told them just to keep it there for the winter because they had space. When the dealer came to pick it up a month ago for the annual maintenance I got a call that there was a CEL and misfire on cylinder 3. They diagnosed it to a sticking fuel injector. I took the car back wanting to run some fresh gas through it first but so far that hasn't cleared the issue.