What is wrong with my car??!?

[1minte46]

Alright guys here is the situation. I have already searched E46 Fanatics and a couple of other websites to see if i could find a solution but it seems that there are many possibilities, so I was looking for Maxbimmer members input into this. So basically here is what has been happening for the past 2 weeks or so my engine light has been coming on and turning off, I connected my OBDII reader to my car and happened to find the following codes.

P1343 Misfire cylinder 1 with fuel cutoff

P1352 Misfire during start cylinder 6

P1350 misfire during start cylinder 5

P0174 System to lean (bank 2)

P0171 System to lean (bank 1)

P1345 Misfire cylinder 2 with fuel cutoff

P0300 Random misfire detected

P1619 Map cooling thermostat control circuit signal low

P0300 Random misfire detected

P1083 Fuel control limit mixture too lean (bank 1, sensor 1)

In addition to this, the way that my car is acting is as follows, the idling is rough at times, when i accelerate the car tends to bog, its as if it's confused lol. Also last night was a little nippy outside, so i turned on the car to let it warm up, as I waited 2-3 minutes I noticed a red light come on , and basically it was my temperature gauge all the way to the right as if it was over heating, but yet when I had the heat on, no heat would come through what so ever, the air coming in wasn't hot or cold. So I decided to drive the car for a bit to see if it would make a difference in the heat coming in, and wouldn't you know it made a difference, heat started to come through the vents and and the temperature gauge went down to normal. Does anyone know what could possibly be happening, because this happens randomly like it will go away and then come back so on and so forth. One more thing that I would like to add is that, when I purchased the vehicle from the used dealership, the motor had to be replaced 24 hours after I had bought it, because the timing chain blew, so apparently they showed me a receipt and calimed they replaced my old motor with a newer one that had less mileage, do you guys think that they probably screwed up when putting the motor in, or the motor that they put is garbage. I wonder if my powertrain warranty will cover these problems.

[Junaid]

temp gauge sounds like thermostat, and the other issues could be anything from maf to ignition coils to spark plugs. Im going to put my money on the maf, but i would get it read by a gt1 to find out exactly what it is.

[1minte46]

Yes, I thought it would have been the thermostat, so now should I be replacing the thermostat or the sensor isn't working properly. Secondly should I purchase my own gt1 or would it be cheaper just to go to a mechanic shop that might have one. The question once again applies to the MAF would i be replacing the whole thing or would it be the sensor. If it is any of the following would you happen to know if its better to get stock bmw or are there any good aftermarket ones that are good? Thank You,

[Eurostyle]

Originally Posted by 1minte46

Yes, I thought it would have been the thermostat, so now should I be replacing the thermostat or the sensor isn't working properly. Secondly should I purchase my own gt1 or would it be cheaper just to go to a mechanic shop that might have one. The question once again applies to the MAF would i be replacing the whole thing or would it be the sensor. If it is any of the following would you happen to know if its better to get stock bmw or are there any good aftermarket ones that are good? Thank You,

You should really check the price of a gt1 before asking!
The MAF is just one thing, nothing else to replace! Again, its all about price, new one is $600-700 OEM, but you might have some cheaper options.

[Junaid]

im not really sure how often your car breaks to justify buying a gt1 haha, but on ebay you can buy chinese version of a gt1 and i believe mark d has one not sure if he sells them or not. Like Filip said if you dont want brand new he sells them. If you unplug the maf and drive if it drives better then i believe for sure its gone bad.

[Ahctuning]

Originally Posted by Junaid

im not really sure how often your car breaks to justify buying a gt1 haha, but on ebay you can buy chinese version of a gt1 and i believe mark d has one not sure if he sells them or not. Like Filip said if you dont want brand new he sells them. If you unplug the maf and drive if it drives better then i believe for sure its gone bad.

What if you unplug the maf and it got worst than worse? (worse meaning engine was already backfiring when revved, coughing)