Installed an afterm ultra power intake cam sensor on my bmw 325i. Car starts initially then won't start. Took out and reinstalled original and at least it starts. Why is the new sensor not working?

SOURCE: My 2002 BMW 325I will not start in cold weather.

hi Fred, kind of sounds like you have a sticking, or contaminted idle valve. when it is 40-45F outside, a sticking or contaminated valve will cause the fuel mixture to be to rich. as the temp warms, the mixture requirement is not as rich. a quick check is to hold the gas pedal to the floor for 5-10 seconds when cranking cold and then let up. if it seems like it wants to start, the valve is faulty.

SOURCE: 1985 BMW 325i Electrical problems.

It sounds stupid, but check the tail light sockets. My 5 series had all sorts of electrical problems and when I replaced defective tail light sockets, most of the problems disappeared.

SOURCE: 2003 stratus cam sensor replaced still unresolved

you bypassed the wires that connect to the sensors? that would have been my first guess the harness that plugs into the sensor. after that i would check the ground connection from the ecm. wouldn't hurt to check the battery posts too. if the battery posts are oxidized you can have all kinds of goofy electrical problems. hope that helps.

SOURCE: 1998 Audi A4 Quattro, 2.8L, AHA, 75K miles, bought...

im a tech in the bronx and i dealt with the same code for the misfire. burt i realized that there wasnt any power to the coil of #2 cylinder. I replaced the sensor mounted on top of the air filter box, which solved this problem.

Colin Stickland

• 22516 Answers
• Posted on Jul 18, 2011

SOURCE: I have a 2002 BMW 530i where the brake light, ABS

i suspect that their is a rusty damaged toothed sprocket on one of the wheels and as its a rear wheel drive vehicle then it could be a back one which is what i would check first