Fuel Cut Mania!

[Mo95Talon]

I just can't figure it out. I thought it was a boost leak. Built a tester, everything held just fine. Couple of small leaks around the locking nut of my Greddy-RS BOV fixed that. I installed a new cone filter (Power Adder from Autozone), and also have had a Apexi Downpipe with cat/eliminator. Do you suppose having the 2nd o2 sensor out of comission would cause fuel cut or maybe the new filter? Thanks guys.

 

[spyderturbo007]

Nope, the 2nd O2 sensor is only there to verify that the cat is working. Also, fuel cut is only caused by an excessive airflow rate. It has nothing to do with fuel delivery. Is your mod list up to date? Are you positive that it's fuel cut and that you don't have any boost leaks?

 

[c4uldr0n]

Your MAS is seeing more air than your engine is ingesting. This is rather common.

1. Between which areas did you test your boost leak?
2. How much pressure did you test?
3. How long did you test that pressure amount?

c4

 

[DGajre777]

Are you re-circulating your BOV? Check for boost leaks... again.

 

[Mo95Talon]

- inlet on turbo 15 psi

-intercooler piping from turbo side 15 psi held longer than through the turbo because the air leaks back through the oil line

i used plenty of soapy water on all coupling and just put in a new fmic. but i had fuel cut before hand as well.

check it both times. thanks guys hope this helps.

 

[No_Skillz]

How much are you boosting? Are you sure what you're experiencing is fuel cut?

 

[Mo95Talon]

15 - 18 psi. I tested for boost leaks with my stock side mount and thought I might of had a hole in the core. So I installed a new front mount and short route piping, tested for boost leaks didn't find any (except for the locking nut on the BOV).

Feels like I hit a brick wall while WOT and in higher RPMS (4500 - 7000)

 

[c4uldr0n]

I don't suppose you have a logger? If you had a logger and made a couple runs maybe we could help identify what is going on.

 

[Mo95Talon]

I sure don't. Wish I did, it would probably be fixed by now.

 

[DGajre777]

Did you check the throttle body for leaks? Is your CEL on?

 

[Mo95Talon]

I checked for leaks once again, there were none. I normally run 15-17 psi with stock BCS. I isolated the BCS, ran the wastegate line direct from compressor to wastegate. Now I run 10-13 psi (have AEM boost gauge) with absolutely no fuel cut. I'll now install an MBC and tune it to the maximum psi without fuel cut. This may not be the best solution, but it certainly solves the problem for no cost. Thank you for the feedback.

 

[c4uldr0n]

I still believe that you are getting unmetered air in your system... have you double checked all of the fittings around the MAS?

 

[Mo95Talon]

As far as the stock intake pipe? Yes I have. If the air filter adapter wasn't tight it wouldn't matter because the air would be leaking before the MAS.