I suspect that my MAF (Mass Airflow Sensor) is faulty. I've already cleaned it with alcohol, as discussed on these forums. Before I spend $280 on the part, I want to be sure that it is definitely the MAF. After reading up on this, it seems that the MAF and O2 sensor can have similar symptoms, so I thought I'd ask if anyone has any suggestions for testing the MAF.
My symptoms are:
- Occasionally the car has power loss/surge. It can happen while driving on the freeway, or after starting up. It typically lasts for a little while (1 minute). After that it usually goes away for a bit more.
- If I let the car idle during a power-loss "moment", it idles very rough. It feels weak. If I give it a fair amount of gas, it'll get past the weak idle and rev normally.
- It seems to happen more frequently on hot days, and when the engine is warmed-up. It's particularly common when the engine is already warm and I start the car.
- When I first cleaned the MAF, I managed to stop the car right when the car had a power loss moment and unplug the MAF. To be honest, I can't tell for sure if it idled better not with the MAF unplugged.
I have a Green (aftermarket) air filter. Not sure if aftermarket filters cause problems with the MAF. I just replaced the fuel pump. It was on its way out. Replacing the fuel pump seems to have reduced the frequency of the power loss problems.
Any help appreciated!