well today the car started to act up a bit i was driving on highway and everyone was going slow so i dropped down to 4th and gunned it around them and at 4 grand the car missed like it hit the governor and the check engine light came on. the code was P1137 it said it was manufacturer control fuel air metering and it has kept doing it since. I'm thinking it might be the fuel pressure regulator or possibly fuel filter. i checked all the vacuum lines and their all good, so if anyone has any idea on whats going on help would be greatly appreciated.
its not whats under the hood, its how you use it
2200 soon to be turbo
I would bet that your problems are MAP or TPS sensor related.
You need some more live info. See if you can get it on a scanner that will display freeze frame data from that code.
PM me if you find anything out.
Buildin' n' Boostin for 08' - Alex Richards
i checked the freeze data when i had the scanner on it and there was nothing there. where is the MAP sensor located i know where the TPS is
its not whats under the hood, its how you use it
2200 soon to be turbo
i checked the freeze data when i had the scanner on it and there was nothing there. where is the MAP sensor located i know where the TPS is
its not whats under the hood, its how you use it
2200 soon to be turbo
whoops my bad did that twice
its not whats under the hood, its how you use it
2200 soon to be turbo
What scanner are you using? Any scanner worth its salt will tell you everything you need to know. This information would help greatly. The computer stores vast amounts of information when it sets a code and stores it as freeze frame data. You need to take a close look at that and preferably post it up here in as detailed form possible and I may be able to better help you.
Its not your FPR or Filter.
Buildin' n' Boostin for 08' - Alex Richards
well its still doing it but it hasn't thrown a code since i erased the one that it threw before. i dont know what the hell is going on
its not whats under the hood, its how you use it
2200 soon to be turbo
There you are...
Buildin' n' Boostin for 08' - Alex Richards
well i think i have found the problem....my spark plug wires. i pulled the boots on the coil side and on one coil a terminal was black and the other was rusty, and i just replaced then like 2000 miles ago, and i noticed that the old coil had the same thing on one coil and the other was like new, so im going to invest in some $57 Accel wires and maybe MSD coil packs, and see if that fixes my problem, it still hasnt thrown a CEL since that day.
its not whats under the hood, its how you use it
2200 soon to be turbo
Make sure to use dielectric gease on the termimals and spark plug boots.
well i changed plug wires thinking that that was the problem....nope still misses around 4K rpms im gunna take my plugs out and re gap them after work today and see if that will help at all. also i have heard that the crank position sensor sometimes wears out and can cause a misfire, has anyone else heard this?
its not whats under the hood, its how you use it
2200 soon to be turbo
Im telling you dude, Do the upstream 02 sensor and I will bet you that it will fix your problems. That code is linked to either 02 signal (Either the sensor or the wiring back to the pcm) or the PCM being bad. thats the only three options.
Buildin' n' Boostin for 08' - Alex Richards
should i get a CEL if i unplug the manifold O2 sensor? i was just wondering because i unplugged it to take it out, but then realized i didn't have the socket to do it so i thought i would start it to see what it did and nothing
its not whats under the hood, its how you use it
2200 soon to be turbo
You should never run the car without it plugged in. The reason you did'nt get a CEL is because the 02 needs time to heat up and the system has not entered closed loop yet which means its running off preset values based on IAT, TP, and MAP inputs. It starts changing the A/f ratios to compensate for other situations (Long term and Short term fuel trim) and alters pulse width to deliver varying amounts of fuel to cycle the engine between lean and rich to optimize catalyst efficiency. The O2's job in the manifold is to input back to the computer info on the last few combustion events chemically based on how much oxygen is in the exhaust. this tells the pcm how lean or rich it is running and it will make PWM adjustments as needed to bring it back the other way.
Buildin' n' Boostin for 08' - Alex Richards
well, thats weird. once it warmed up to around 80 degrees or so it quit the misfire...WTF? and i was just about to get the O2 tomarrow. i'll wait and see what happens.
its not whats under the hood, its how you use it
2200 soon to be turbo
When air is warmer it has less density...there is less molecules per cubic foot of air. therefore...
Just roundabout numbers...say...
IAT = 50f
TP = 12%
MAP = 16" steady (mostly given in KpA btw)
Inj avg pulse width = 22.5ms
O2 reading = 500mV (close to 14.7 a/f)
The air is denser than it is at 80 degrees so when we increase the ambient temperature to 80 there is less molecules of oxygen to burn with the gasoline. If we kept the Pulse width (the time the injector stays on) the same and increased ambient to 80f lets see what kind of readings we would get and why...
IAT = 80f
TP = 12%
MAP = 16"
inj avg pw = 22.5mS
O2 = 250mV (I may have this backwards..I do believe a higher voltage indicates a lean mixture. I do know however this result is fictional and probably over exagerrated for the values given, forgive me)
Keeping the pulse width at 22.5mS we see the O2 begins to read low which indicates a rich mixture. (Do I have this backwards or not?) in this case the pcm would narrow the injector pulse width to compensate and bring the engine back closer and more than likely past 14.7:1
So, we see that if we continue with a set pulse width based on our O2 readings the PCM will recognize it as a rich condition and make an adjustment to the fuel mixture. My guess is that the O2 is putting out low or weak voltage signal (keep in mind they are essentially batteries and do wear out and or get weak) indicating a rich mixture and the pcm is attempting to drop the pulse width enough that you are having problems with fuel above 4k when the air is actually denser and colder than 80f. Once the ambient is above 80f the mixture problem is still more than likely a little lean, but is not severe enough to cause the lean misfire you may be having.
I would be interested to see what the KR, O2, and MAP signals look like. As well as the injector Pw.
Buildin' n' Boostin for 08' - Alex Richards
well i just replaced the upstream o2 sensor finally, there was a lack of funds there for a little while. we'll see what happens now.
its not whats under the hood, its how you use it
2200 soon to be turbo
went for a drive....yep wasted my money, it threw a code again heres the info i got.
P0137 Twice -- o2 Sensor low volts ( Bank 1, Sensor 2)
P1137 -- Manufacturer Controll fuel air metering
FREEZE DATA
DTC that caused freeze frame P0137
Engine RPM -- 2359
Load Value -- 35.2%
Map Sensor -- 41 Kpa
Coolant Temp -- 185F
Long Term Fuel Trim -- 1.5%
Short Term Fuel Trim -- -96.7% (thats negative i didn't add an extra dash)
Vehicle Speed -- 62Mph
Fuel System 1 -- Closed
Fuel System 2 -- N/A
so what im getting out of this is that it is the downstream o2.
its not whats under the hood, its how you use it
2200 soon to be turbo
sounds like it is DSO2
The downstream does not have an effect on the A/F however so I dont know why your STFT is so low.
possible problem in the wiring...but if I'm replacing the pre cat O2 usually its a good idea to replace the post cat O2 with a matching brand at least if its on the same bank.
Buildin' n' Boostin for 08' - Alex Richards
is there something i need to do so that the computer knows that theres a new o2 sensor? or just replace the DSO2
its not whats under the hood, its how you use it
2200 soon to be turbo
Just replace it...the pcm should pick up on it and it should turn the MIL off...
Hopefully you have'nt just erased the codes...
Buildin' n' Boostin for 08' - Alex Richards
replace the rear o2 sensor with one directly from gm. if you used a bosch o2 sensor up front, yeah, you did waste your money, because it'll go bad in about 5000 miles. may as well get one of those from the dealer too.
JBO Stickers! Get yours today!
dammit bosch you suck. if i would have known that i would have sprung for the expensive one
its not whats under the hood, its how you use it
2200 soon to be turbo
Is it better to go acdelco for anything related to fuel delivery or power train management....yes....
But I also have over 10k on a pair of bosch sensors with no problems, so lets not be judgmental with brands
Buildin' n' Boostin for 08' - Alex Richards
