The past 2 weeks I have noticed my GSR running dead lean and sort of hitting a brick wall. I have an autometer A/F gauge, and though it isn't the most accurate in the world, it still is showing absolutely no variation in the A/F and will be stuck at the lowest red mark. The car feels like it isn't getting any fuel at all and I have to blip the throttle to make the car go back to normal. The problem doesn't occur every time I drive the car, but when it is happening it continues to do it for the duration of my drive.

I have been told this could be my primary 02 sensor crapping out. At part throttle it is in closed loop and the ecu is calibrating strictly off the primary 02, which is going south and not being able to give me the proper fuel?

I appreciate any help, this is quite annoying




Modified by CROM at 9:15 AM 8/4/2004

 

Bump for a similar problem.

 

bump! similar prob.

o/t, what'd you do to a mod to make them title you a trial user? lol.

 

Dont you need a specific number of posts to get off trial user status?

 

up

 

Also,

Anyone think these problems could be caused by:

Bad TPS??
Bad AEM FPR??

 

Try resetting the ECU to zero out the long term fuel trim. That hesitation could be from running too lean as a result of the long term fuel trim, which would indicate that you have an underlying issue that causes it to run too rich in closed-loop.

A weird TPS signal could also be a culprit. Measure the voltage by probing the back of the harness at the ECU. Red/blk and ylw/grn I think are the wire colors on the "D" ECU socket. I have issues like this when the TPS reads 2% to 3% when the throttle plate is fully closed.

 

Thanks for the suggestions

I reset the ECU a couple days ago and the problem still persists.

I'm going to test the TPS this evening. I still don't think that running too rich is the culprit as I have been running this exact state of tune for 2+ years with no problems.

I'm tempted to replace the 02 sensors anyway, my secondary sensor has been dead for many years and it couldn't hurt to replace the primary one. I can get NTK OE replacement primary 02's for 80 bucks shipped.

 

Where can you get the o2 sensors at that price?