240smoke

I have been driving my set up around for months and it has ran perfect. Last night I was driving it and it hesitated and then drove fine. I got to where I was going and the AFR went to 10 and then the car stalled. The car will start and run normal and then about 5 seconds after start up, the AFR gauge slowly goes to full rich. I am lost as to what the problem is.

The car is completely stock besides an HKS GT2510 turbo. Stock injectors and ECU.

240smoke

My motor started running normal today then it goes back to runnning rich and if I push the gas past 1/4 throttle, it goes full lean. If I shut the car off, it runs normal for a few minutes then goes back to running rich. Anyone have any idea what could be the culprit?

EBE23

don't u have to upgrade your injectors to run a sr20det? and retune your ECU? just curious, i don't have a turbo setup

240smoke

Umm.... SR20DET comes with 370cc injectors stock and its a turbo motor. Well that post helped 0%.

Cars seems to be running fine now, I have no clue what caused it to run rich and misfire like it did. I ran the tank pretty much dry and filled up and now its running decent. Still not perfect.

japanesenut

what fuel pump are you running , what octane gas and your fpr could be going on the fritz. watch it or get it checked out , and check all lines vacuum and other wise ,anything that has to do with your vacuum can mess stuff up , my speed sensor is screwy and it wont let me start the car so i have to unplug it ,plug it in back later . i need a new one but a quieter exhaust is more important right now .Just trying to help.

240smoke

I was thinking it could be FPR till I shut the car off while I was driving it and pop started it and it ran fine for about 2 minutes then started acting up again. I just put all new vacuum hoses on and they are all secure. I am running a walboro Fuel Pump with 93 octane gas.

japanesenut

(copied from another site )

Diagnosing your fuel system can be frustrating enough, but turn the irritation level up a few notches if you've been through it from top to bottom and still don't know where the problem lies! If you suspect a fuel pressure regulator isn't holding its own but can't find anything wrong with it, try checking out the vacuum line. A leak can appear in the vacuum port of the FPR (mechanic speak for fuel pressure regulator) and cause it to lose fuel and pressure through the vacuum hose.

An easy way to test for an FPR leak in the vacuum side is to replace the vacuum line going into the FPR with a length of clear tubing. Now you'll be able to see leak as it happens. IT will most likely show failure when your vacuum is at its lowest point, as in during acceleration.

240smoke

Funny thing is I replaced that line. I wish that were the problem.

japanesenut

Put a clear one in it so you can s if you have a leak there pulling fuel into your intake .

240smoke

Oh, I get ya. didnt really understand that one at first. I will try that tomorrow. If anything, I will just pull the one off my KA fuel rail and swap them real quick.


I believe it to be the TPS though. Gotta check that out tomorrow.

240smoke

Alright, checked TPS, checked computer, wasnt throwing any codes. So I am pretty lost right now. I found a couple bare wires in my wheel well but I taped them back up and that didnt solve anything.