bolt ons & running rich, ways to diagnose and solve?

[jt15833]

Never really noticed my car running rich but after daily driving it again after a few months while I was away I've been noticing a bit of fuel in my catch can. Mods include

Stock CA18DET with stock T25Walbro 190lph fuel pump3" turbo backFMICBOV (atmosphere vent, i know i know but it wasn't rich before when I had this bov but it is now. And believe me, i'm working on getting it recirculated)

Here are my questions. *Fuel richness seems like it could be difficult to diagnose. My first guess would be to accurately calculate the gas mileage and see just how poorly it's running. other than that it sounds like I need to throw parts at it.

The only fuel mod is the 190lph pump and I got the 190 so I wouldnt run rich but here I am. I am definetly getting a nismo fpr, will this help with leaning it out? I wasn't planning on getting an SAFC this soon but I was going to eventually, and if this can fix it I'm all for it. As for using the SAFC to fix this, I definitely wasn't planning on getting getting a wideband but how else can you tune with the SAFC other than dyno. I'm not objecting do a dyno for the tune, but seems excessive for almost stock CA. Any input on the dyno tune vs. wideband tune (not necessarily for power, but for a more realistic fuel afr).

I'm going to do a compression test to make sure my rings havent washed away and I really hope they haven't. Can you guys think of anything else to diagnose / resolve these issues? Thanks alot

[davidricardo86]

Never really noticed my car running rich but after daily driving it again after a few months while I was away I've been noticing a bit of fuel in my catch can. Mods include

Stock CA18DET with stock T25Walbro 190lph fuel pump3" turbo backFMICBOV (atmosphere vent, i know i know but it wasn't rich before when I had this bov but it is now. And believe me, i'm working on getting it recirculated)

Here are my questions. *Fuel richness seems like it could be difficult to diagnose. My first guess would be to accurately calculate the gas mileage and see just how poorly it's running. other than that it sounds like I need to throw parts at it.

The only fuel mod is the 190lph pump and I got the 190 so I wouldnt run rich but here I am. I am definetly getting a nismo fpr, will this help with leaning it out? I wasn't planning on getting an SAFC this soon but I was going to eventually, and if this can fix it I'm all for it. As for using the SAFC to fix this, I definitely wasn't planning on getting getting a wideband but how else can you tune with the SAFC other than dyno. I'm not objecting do a dyno for the tune, but seems excessive for almost stock CA. Any input on the dyno tune vs. wideband tune (not necessarily for power, but for a more realistic fuel afr).

I'm going to do a compression test to make sure my rings havent washed away and I really hope they haven't. Can you guys think of anything else to diagnose / resolve these issues? Thanks alot

Im going to point the finger at your oem fuel pressure regulator. The fuel pump you bought might be overpowering the oem fpr. Id get the Nismo Adj. FPR and set the base fuel pressure to a factory 36.3 PSI IIRC. Check to see if a injector(s) are stuck open. Check all injectors for opertation. Check for spark and if possible check your timing. Clean out your catch can too. Id probably remove the spark plugs and inspect the tips. Start with these simple test and let us know what you find.