SES Light on, got the trouble codes...help plz
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SES Light on, got the trouble codes...help plz I have kind of searched around to look for an answer, but I figured it would be more direct if I just asked my question. My car is running kind of rough at idle and I dont know why. Its like the whole car has a low growling from it. I have a 98 Z28 LS1 with Jet Hot Headers, Jet Hot ORY, and Borla Cat-Back with a SLP Lid, MSD Wires, and NGK Plugs gapped at .040. Should I go get new plugs? If this computer has been dyno tuned before, is there any way to erase it or set it back to stock. Does my car need to be re-tuned? Here are the trouble codes:
PO133
PO140
PO153
PO160
PO405
Can any of these codes cause a problem? I think that three or four of those are O2 sensors, and one is an EGR code, which my EGR is gone. Thanks for the help.
PO133
PO140
PO153
PO160
PO405
Can any of these codes cause a problem? I think that three or four of those are O2 sensors, and one is an EGR code, which my EGR is gone. Thanks for the help.
p0133=O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
p0140=O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
p0153=O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
p0160=O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
p0405=Exhaust Gas Recirculation Sensor A Circuit Low
you might need to get some new o2's or clean the ones you have. the slow response codes mean that they aren't getting hot enough for the computer to read. no need to get retuned. just delete them and you should be ok. the egr code needs to be erased from the pcm w/hpt,efilive, etc. or it will come up again unless you already had that taken care of.
p0140=O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
p0153=O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
p0160=O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
p0405=Exhaust Gas Recirculation Sensor A Circuit Low
you might need to get some new o2's or clean the ones you have. the slow response codes mean that they aren't getting hot enough for the computer to read. no need to get retuned. just delete them and you should be ok. the egr code needs to be erased from the pcm w/hpt,efilive, etc. or it will come up again unless you already had that taken care of.
Looks like it is time for new o2 sensors. The coating on the headers is famous for fouling them out. Do yourself a favor and get a set that has a warranty on them, should it happen again.
The EGR code is on because the tuner must have missed it when they were changing the DTC reporting status.
The EGR code is on because the tuner must have missed it when they were changing the DTC reporting status.
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So since I have no rear o2 sensors, then I should I replace the front O2 sensors since they are probably screwed from my jethots. Any brand recommendations? Also, I had this car dyno tuned with my NGK TR55's gapped at like .040. Is this bad? What is the best gap for my plugs with the setup that I have, and would it mess the tuning up at all with a different gap in the plugs?
Originally Posted by LiveForSpeedZ28
So since I have no rear o2 sensors, then I should I replace the front O2 sensors since they are probably screwed from my jethots. Any brand recommendations? Also, I had this car dyno tuned with my NGK TR55's gapped at like .040. Is this bad? What is the best gap for my plugs with the setup that I have, and would it mess the tuning up at all with a different gap in the plugs?
Spark plug gap wouldn't mess up the tune - nothing actually would mess up the tune itself besides the PCM going bad. A tune is basically a bunch of instructions telling the car how to run...different components might fail (o2's, cats, etc) but the tune itself doesn't change.
The tuner will need to go back and fix the rear o2 codes so that they don't come back either.
It doesn't really sound like the car was tuned...or if it was, the tuner fell asleep when he/she was doing it. You might want to think about getting a dyno tune to a) fix all your codes that shouldn't be there and b) make sure the tune is where its supposed to be.
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So is it vital to replace those two front O2 sensors, or would you just take them out and try to clean them? The rear O2s and the EGR being gone cant effect how my car runs, it will only throw the light, but the front O2s do determine how my car runs to an extent, right? I am just seeing what I have to do here, the light doesnt bother me, but if those two front O2 sensors arent helping then I guess thats what I am going to have to do. But they are 70$ a piece, and I dont really feel like spending that much moola. Also, what would you gap your NGK TR55's at with my setup cause I think I am going to replace the plugs as well, since my MSD wires are brand spankin new. thanks for the help fellas.
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haha, no, threw em away, they had 100K miles on em, they were in pretty bad shape too. Are these front O2 sensors vital on the performance of my car? Are codes PO133 and PO153 harmful? Is it neccessary to replace them? Or better yet, what would you do if you were in my shoes, the money isnt too much of an issue. Thanks
Originally Posted by LiveForSpeedZ28
So is it vital to replace those two front O2 sensors, or would you just take them out and try to clean them? The rear O2s and the EGR being gone cant effect how my car runs, it will only throw the light, but the front O2s do determine how my car runs to an extent, right? I am just seeing what I have to do here, the light doesnt bother me, but if those two front O2 sensors arent helping then I guess thats what I am going to have to do. But they are 70$ a piece, and I dont really feel like spending that much moola. Also, what would you gap your NGK TR55's at with my setup cause I think I am going to replace the plugs as well, since my MSD wires are brand spankin new. thanks for the help fellas.
An o2 sensor is what is telling the PCM to make corrections as you drive. If it's not reading right, it's going to over or under compensate, making you too lean and too rich in the wrong areas....gas mileage will also take a poop. You can do without rear sensors, basically those are just measuring how efficient the catalytic converter is (if you have one).
I know they are kind of costly, but they are important....the only way to get around front o2s is using an open loop tune, where the car just runs off a set of predetermined values. But really, just get the o2's..
I gapped my TR55's around .050 if I remember correctly.
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Alright, well, I am going to pickup those O2 sensors and spark plugs and give that a whirl to see if it makes my car run a little smoother. .050 sounds like a good number, I will try that with these MSD wires and see how it does. Thanks for all of the help but I guess thats what I have to do.
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I reset my computer to reset my codes after putting in the 13111 Bosch O2 Sensors. I am going to put my plugs in tonight, everyone agree on the .050 Spark Plug Gap for my setup with the full exhaust, intake, and MSD wires? I am just trying to get my car running supreme, those new O2 sensors are LONG!, but they are helping a lot. After I put in my plugs and get everything set up, do you recommend a tune or not? Do I "need" one or would it just help a lil? Thanks for the input. 