map sensor problems... maybe.
08-26-2004, 06:21 AM
#1
map sensor problems... maybe.
Here is my situation...
Car runs pretty much fine until it hits normal temp. As soon as it hits normal temp, it starts running like complete ****. When driving, it feels like it hits fuel cut or a really bad ignition miss as soon as any load is on the motor. I've replaced the Crank Sensor, the O2 sensor, the distributor, plugs, and the map sensor (but maybe with another bad one)... the fuel pump and filters are fairly new.
If I'm not mistaken, it also misses or cuts out at full throttle. The car is turbo'd, so I really am afraid to even try that to make sure, but I think it does this under full throttle as well.
Today the car threw a Code 1. I've tried a few O2's so that isn't the problem. Also, I have one of those crapy A/F meters, and although they aren't accurate, it isn't doing anything different than normal, so it doesn't appear there are any O2 problems at all.
I'm almost certain this is a map sensor issue. I had a bad map sensor a while ago and problems were similar. I replaced it with a map sensor I had around and it was fine for months. Now it is acting up again and seems very similar, but it doesn't change if I switch it. The problem is that I might be switching back to that old bad one if I got them mixed up. I don't want to go buying a new one if that isn't the problem.
So I guess my question is... is there anything else this could be that I'm missing? I will run fine as long as there is no load on the motor. The car doesn't throw any of the map related codes, but does throw an O2 code on various different O2 sensors. Is it possible that the map sensor is fucked just enough that it isn't throwing a code, but is jacking up the a/f mixture enough to throw an O2 code? Does the ECU compare the map reading to the O2 reading to decide if it needs to throw that code? What the hell could be going on.
Car runs pretty much fine until it hits normal temp. As soon as it hits normal temp, it starts running like complete ****. When driving, it feels like it hits fuel cut or a really bad ignition miss as soon as any load is on the motor. I've replaced the Crank Sensor, the O2 sensor, the distributor, plugs, and the map sensor (but maybe with another bad one)... the fuel pump and filters are fairly new.
If I'm not mistaken, it also misses or cuts out at full throttle. The car is turbo'd, so I really am afraid to even try that to make sure, but I think it does this under full throttle as well.
Today the car threw a Code 1. I've tried a few O2's so that isn't the problem. Also, I have one of those crapy A/F meters, and although they aren't accurate, it isn't doing anything different than normal, so it doesn't appear there are any O2 problems at all.
I'm almost certain this is a map sensor issue. I had a bad map sensor a while ago and problems were similar. I replaced it with a map sensor I had around and it was fine for months. Now it is acting up again and seems very similar, but it doesn't change if I switch it. The problem is that I might be switching back to that old bad one if I got them mixed up. I don't want to go buying a new one if that isn't the problem.
So I guess my question is... is there anything else this could be that I'm missing? I will run fine as long as there is no load on the motor. The car doesn't throw any of the map related codes, but does throw an O2 code on various different O2 sensors. Is it possible that the map sensor is fucked just enough that it isn't throwing a code, but is jacking up the a/f mixture enough to throw an O2 code? Does the ECU compare the map reading to the O2 reading to decide if it needs to throw that code? What the hell could be going on.
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