Got codes check

[frizbal]

I have a 96 firebird 3.8 5 speed manual. It has been misfiring for a little while now when i gun it. Just like alot of the 3.8's out there. But also my oil pressure drops way under 60 lbs when i let off the gas and when im on the gas it is above 60. It sputters a little bit when taking off from a stand still too unless i give it alot of gas. Well i figured it would be the coils, or plugs, or somethin like that but before i got into all that i figured i'd get the codes checked. well i dont know what any of them mean. they are (exactly as ticket says)
history DTC p0113
IAT sensor 1
circuit high input

MIL REQUESTED
since IGN NOT RUN
since clear P/F

history DTC p1111
IAT sensor
intermittent ckt
high voltage
MIL NOT REQUESTED
since IGN NOT RUN
since clear P/F

history DTC p1641
MIL control
circuit

MIL NOT REQUESTED
since IGN PASS
since clear P/F


i have no clue what any of this means. if you know any of them, any help would be appreciated.
also is the low oil and (seemingly) misfire part of the same problem?
-thanks for the help-

P.S.
if this seems kinda thrown together im sorry, i'm in a hurry

[blindeyed]

Well I know the IAT sensor is your Intake Air Temperature sensor. The sensor that plugs into your intake elbow. They're not expensive at all, you could try replacing that and see if that helps any. Not sure what all the other jargon means or if it has anything to do with your problem. The IAT sensor seems to be the only thing that sticks out to me. What that sensor does, is it reads the air temperature, and depending on how hot or cold the air is, it estimates how much fuel to dump into each cylinder. Hopefully you don't have one of those so called "resistor mods" on the sensor harness, you know, the ones that claim to give you up to 20 hp. If that's the case, then it would be causing you to run very rich. Either way, I would suggest replacing the sensor/removeing the resistor (if that's the case). Sounds like that sensor could be the source of your problems, seeing as in how the computer would be getting a false reading which would pretty much make it guess how much to fuel to feed. My guess is your probably running lean right now.

Not too sure if it all has anything to do with the oil pressure. I know your oil pressure is supposed to be around 60 psi at 1850 rpm, so.. as long as it's not dropping extremely low (say around 20 psi) then I would have to say that is normal, seeing as in how that's what my car does. Especially if I'm coming to a stop, it drops down to about 45-50 psi.

[frizbal]

Thanks for the input! I'll replace the sensor and re-post this weekend.

[frizbal]

Well, i bought the sensor and went to replace it but it didn't even need it. I found out it had just come unplugged a little bit. But i figured, $12 part... 10 year old car... i just replaced it anyway. But it still stalls. So i figured now just start with the plugs, wires, coils? In that order?

[blindeyed]

Originally Posted by frizbal

Well, i bought the sensor and went to replace it but it didn't even need it. I found out it had just come unplugged a little bit. But i figured, $12 part... 10 year old car... i just replaced it anyway. But it still stalls. So i figured now just start with the plugs, wires, coils? In that order?

Can you explain the stailling? Such as under what conditions is it stalling at? Just at idle, or like when you gun it... etc

[frizbal]

Originally Posted by blindxeyed

Can you explain the stailling? Such as under what conditions is it stalling at? Just at idle, or like when you gun it... etc

Well, when its idling the rpm's drop and it stalls a little about every 5 to 10 seconds. It doesn't die, but also when i take off from stopping it does it too. And also when i step on it it does it too. The guy when i bought said he changed the plugs too long ago. But what one guy says and does are two things. He was kinda squirly so im not sure if he did. I bought it 10k miles ago.

P.S.
Is there any kind of filter that needs changed for the a/c that would make it blow harder/colder?

[blindeyed]

Not too sure on that one man.. definately sounds like a fuel delivery problem though. I'd first start off with replacing the fuel filter, start small and work your way up.

[wrightz28]

Ummm, how does a motor, stall, but yet not die

[blindeyed]

Originally Posted by wrightz28

Ummm, how does a motor, stall, but yet not die

I was kind of wondering the same thing. I just figured he meant it was "about" to stall, kind of a stutter maybe?

[97cavalier]

ya try a new fuel filter first, it might even be a bad injector.

[frizbal]

Originally Posted by blindxeyed

I was kind of wondering the same thing. I just figured he meant it was "about" to stall, kind of a stutter maybe?

ya, you got it. it just about dies then kinda jolts back up to normal rpm's. sorry about that. well i replaced the pcv valve today...and it was over due! Im going to see about the fuel filter hopefully by the end of this week. i'll repost when im done. thanks guys