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View Full Version : Sr20det running super rich please help


Bobbybee
05-09-2013, 07:25 PM
Hello everyone,
I just bought this 92 240 with a s13 sr swap pretty much stock has a fmic,walbro 255 and bov to atmosphere thats bout it on 7 psi was running weird but I figured easy fix. It was chugging at high rpm. Swapped maf with a buddy ran the same in the process I noticed a little blue plate over the maf sensor hole ( the little one in the housing) had a little drilled in it for the air really small maybe half the size of a pencil looked on my buddies an he didn't have it so I removed it an put in on an took here for a drive an wow pulled hard in every gear no problem but when I ca,e to a stock it started chugging an idle really low rev up an it was loaded up cleared out after a rev or 2 but once it gets to lower rpms it jus loads up again swapped maf ran the same checked all vacuum lines no problems drove 16 miles to work an back took a quarter tank put new plugs gapped at .028 an tt 300zx fuel filter still the same I cleaned the maf an broke the little wire so will have a new one tomorrow but in limp mode idles perfect an not loading up at all so the previous owner put that to lean the car out could it be the ecu? Please help any in put will be much appriceated

ultimateirving
05-09-2013, 08:11 PM
I would recommend doing a boost leak test being that you just acquired the vehicle.
Dont trust the previous owner hooked things up right.

Bobbybee
05-09-2013, 08:16 PM
Ok I'll do that tomorrow could that cause it to run that rich?

zombiewolf513
05-09-2013, 08:16 PM
Id like to see a picture of this plate that was over the mafs. Personal interest

Bobbybee
05-09-2013, 08:21 PM
How do I post pics lol

Bobbybee
05-09-2013, 08:36 PM
http://zilvia.net/f/attachment.php?attachmentid=54735&stc=1&d=1368153333

The hole on the right was the screw hole an the other one was for the air to the sensor

zombiewolf513
05-09-2013, 08:51 PM
That sounds really fishy. Has anyone else seen something lile that before?

Bobbybee
05-09-2013, 09:12 PM
Ya really janky he said he got a chipped ecu for it off eBay so I'm thinking its that. Maybe tuned for a different build or something swap is only 6 months old also an I have a receipts I can tell he wash the brightest star in the sky but idk if he did this or the shop that installed it

Bobbybee
05-11-2013, 03:20 PM
Figured it out the ecu is chipped an tuned to 550 injectors an z32 maf an my car doesn't have that lol