Mark S

iTrader: (1)

I think my AFM is acting up.

When I start the car, it will run fine for about 15 seconds. Then, the check engine lite comes on and if I get on the gas at all, it will start to miss, backfire etc.

It's an s-5 and the check engine code is for the intake air thermo sensor. The manual says this just causes the ecu to default to a 68degree ambient air temp. Would this cause the car to miss?

I've tried the AFM and air thermo sensor test procedure in the fsm, but I'm not 100% sure i'm doing it right. The manual lists an open and closed resistance measure for the AFM in the specs. However, when I test mine, the # is the same regardless of how I move the afm slider thing. Anyone know if this is normal?

Mark S

iTrader: (1)

Also, I noticed once the code kicks for the intake themo sensor, the car will run ok, as long as I'm still in the range of the TPS. As soon as I move the throttle beyond it, the missing, bucking etc starts. Does the ECU ignore the AFM while still in the range of the TPS?

dr0x

Your car will run perfectly fine w/o a AIT sensor, or a malfunctioning one.

Mark S

iTrader: (1)

Any idea if the problem lies in the AFM? I know it's not what the code is for, but I'm at a loss for what the problem is...

dr0x

Quite possible. Yours failed the ohm test? Are you sure you did it right? Lots of times you wont get a reading because you have your DMM set wrong.

Mark S

iTrader: (1)

TTT

Mark S

iTrader: (1)

Found the problem, broken wire, Thanks