Does anybody know what kind of readings I should be seeing on my Scanmaster for the MAF sensor?


Well, it still doesn't make sense because even when it's running the way it is, it runs fine in first gear. It doesn't start acting up until the 1-2 shift. It also smooths out after you get up to 60 MPH and cruise. So it seems like if it were the MAF, it'd be acting up all of the time. Correct?

 

That's true... Sorry, don't know anything else to say to try.

 

Hey no problem. I appreciate you trying. Thats what I want. Maybe it'll ring a bell in someone elses head. Thanks!

 

Anybody else have an idea? I've got a new MAF on the way. Thanks.

 

Well lets see...

Its not the opti, plugs, coil, wires, or a spun bearing.

It could still be the MAF, MAP, IAT sensor, IAC, faulty O2 sensors or connections. Make sure everything is snug.

You shouldn't drive around TOO much in open loop. The car uses stored data to calculate timing, fuel tables, etc. If there is a drastic change in the data like temp, quality of gas, etc you could damage your motor.

 

might wanna check your fuel pressure rich, mine played this game with me when the fuel pump was goin, until it eventually wouldnt start. its kinda a shot in the dark but who knows maybe that'll be it.

 

I've got a FP gauge and the fuel pressure is fine. I am also showing a code 44 that came up today. It says that this code is for Bank 1 (left) O2 sensor lean. But my Scanmaster is showing that my Right O2 sensor is giving the faulty readings. That is why I changed my Passengers side O2 yesterday. Also, my left side block learns are reading around 160 and the right side is right where it should be. It seems as if things are contradicting themselves. But I'm gonna ask a stupid question here. What side is the right side and what side is the left? Is this determined from inside the car our from the front of the car. I'm thinking that maybe I've changed the wrong O2?????

Also, I've been sitting here racking my brain about this all day and here is what I've been thinking. If it were the MAF sensor, wouldn't both of my O2 readings be acting up instead of just the right side? Also could it be an injector problem? Sometimes the O2 reading is right. But most of the time it is wrong.

Thanks to everyone for their help/ideas thus far. I appreciate it more than you know.

 

The o2's aren't very accurate, esp. when things change quickly, so the readings you are seeing may well be the result of actual changes in the air/fuel ratio that the sensors are reading. In other words, it could be some sort of a misfire that youre seeing in the o2 readings.

just a thought...

 

Well I just removed the Drivers side O2 and it was so black, it looked like someone had dipped it in charcoal. And I aslo noticed that my Left side Injector Pulsewidth is around 8 when I am accelerating and the Right side Injector Pulsewidth is only around 4 - 4.5.

 

Well, I've been told that it sounds like I've burned one of my O2 wires. And that it's reverting back to the stored tables and ignoring the sensors. I tried to see if I had any burned wires, but it's pretty difficult. I did notice that one of the wire harnesses that is wraped in heat shielding is pretty close to my #6 primary. So I guess I'm gonna have to jerk the headers off. Let me know if you can think of anything else guys. Thanks.

 

once again check those plugs and wires and make sure they are not burnt---believe me I had the same freakin problem and it turned out to be the number 8 wire was toast. Problem was I couldn't see it arcing at all even at night but otherwise the car ran fine until WOT and it started surging and missing!! I pulled the wires and voila!! I also said there was no way it could be wires or plugs but I was wrong.. Just for ***** and giggles replace the wires and run it again, if it isn't return the wires.

 

I would check out that wiring and reset the pcm, so your BLMs can start fresh and you can see what they are now doing. You also might want to notice what the MAP is doing.

 

Rich: I'm not sure about your car but on mine the O2 sensor wire comes out of the heat wrap pretty close to where the Y-pipe joins so it might be touching there.

Like I said on ICQ, it would explain your code 44 and you running rich on that side.

 

Gripenfelter: Thanks so much for your help. But I've got another question for ya (I'm sure you're not surprised ). Anyway, why would I be receiving a code 44 which means that the Left side O2 is lean. But the Right side O2 is the one showing the incorrect readings. Could this still be caused by a burnt wire? Thanks again. If I get this problem figured out, I'm making the trip from Michigan up to Canada and taking ya out for some drinks!

 

From the questions you are asking (which is the right side of the car?.... what is the MAF supposed to read?.... etc.) I would guess that you have not read my ScanMaster writeup. That will answer a lot of your questions, and tell you what each sensor should read as you drive. You are going to have to look at all of them, and see which ones don't look like what I describe. As mentioned above, look at MAF, IAT, CLT, pulse widths, TPS, MAF, O2, etc........ One or more of them is not going to be what it is supposed to be.

Let me read through the whole thread and try and see if I can see why you are having the right vs. left question....