gvr4ever
Well-known member
I replaced my 02 sensor once before. Maybe I don't remember all the problems that it caused, but I remember bad fuel economy and a CE light.
I'm having a problem with my car that I thought was a repeat fuel delivery problems, but now I'm not sure sure. I took the car out on an extended drive today. Got it really warmed up. Probably had it out for about 40min driving it around.
Starting out cold, the engine smells really rich and runs rough. I noticed today that my A/F gauge took way longer then normal to start register. Then when it started too, it seemed to have a delay from the time I hit the gas, till the gauge registered a richer condition. This is a very new symptom. Driving the car before the engine is all the way warm, the car sputters, has a throttle delay.
After the car was fully warmed up and I had been driving it for awhile, I noticed it ran exactly like it should. Under normal conditions anyway. I have the boost set to 7psi and I'm not touching WOT till I get this figured out. I've hit 5psi at about half throttle or more and it seemed to be acting right. Throttle response, idle, boost all act perfectly normal once the car is warmed up.
I don't have a CEL light, knock gauge never goes off, but could a failing 02 sensor cause all these problems? If not, what else could throw off air fuel ratios when cold? Their also seems to be a slight delay when warm too.
Tune has been the same for years. Keydiver chip, 550cc injectors, 3G MAF. The car ran perfectly at WOT at 18psi like 1.5 weeks ago or so. Something changed, but it wasn't parts or tune.
COP, plugs, wires, are all new. I checked the base fuel pressure again. The timing was checked not too long ago because the CAS was changed out. I can do another boost leak, but I did one not too long ago. The way the boost gauge reads, I'm pretty sure that's not it. Boost climbs normal once the car is warmed up.
Any ideals?
I'm having a problem with my car that I thought was a repeat fuel delivery problems, but now I'm not sure sure. I took the car out on an extended drive today. Got it really warmed up. Probably had it out for about 40min driving it around.
Starting out cold, the engine smells really rich and runs rough. I noticed today that my A/F gauge took way longer then normal to start register. Then when it started too, it seemed to have a delay from the time I hit the gas, till the gauge registered a richer condition. This is a very new symptom. Driving the car before the engine is all the way warm, the car sputters, has a throttle delay.
After the car was fully warmed up and I had been driving it for awhile, I noticed it ran exactly like it should. Under normal conditions anyway. I have the boost set to 7psi and I'm not touching WOT till I get this figured out. I've hit 5psi at about half throttle or more and it seemed to be acting right. Throttle response, idle, boost all act perfectly normal once the car is warmed up.
I don't have a CEL light, knock gauge never goes off, but could a failing 02 sensor cause all these problems? If not, what else could throw off air fuel ratios when cold? Their also seems to be a slight delay when warm too.
Tune has been the same for years. Keydiver chip, 550cc injectors, 3G MAF. The car ran perfectly at WOT at 18psi like 1.5 weeks ago or so. Something changed, but it wasn't parts or tune.
COP, plugs, wires, are all new. I checked the base fuel pressure again. The timing was checked not too long ago because the CAS was changed out. I can do another boost leak, but I did one not too long ago. The way the boost gauge reads, I'm pretty sure that's not it. Boost climbs normal once the car is warmed up.
Any ideals?