My apologies if this is a repeat post! I have a 98 xc that has begun to stall at lights and lose power while accelerating. At first this was intermitant and only at low speeds, but now it has gotten much worse and does it at all stages, to the point the vehicle is no longer really drivable. Some months ago the car was acting in a similar manner. During that time i changed the fuel filter, spark plugs, and pcv system. It ended up being the pcv. I had the codes pulled several days ago and the following showed up P0108 (MAP/BARO) P0410 (Secondary Air Injection System Malfunction) P0130 (O2 Sensor Circuit Malfuction - Sensor 1) and P0505 (Idle Control System Malfunction). Thanks in advance for any help you can give me.

 

I would check for Vaccum leaks.
Then I would at the O2 sensor.

 

I was unable to find any vacuum leaks. I replaced the front O2 sensor - it appears the old one was unplugged the whole time (but it did look bad, so i went ahead and switched it). However, the car is no better. In fact, it has reached the point it will hardly pull itself around the yard. Any other ideas? Also, in an attempt to win the dumbass of the day award i started out trying to change the back O2 sensor (thinking it was the front). Before i caught myself I had already cut the wires. Can i merely solder the wires back together, or do ineed the wires at all? (I live in a state that has no vehicle emissions checks, so I'm not worried about that) Thanks again for any advice...

 

OK - I had neglected to unhook the battery to reset the computer for the o2 sensor - the car appears fine now. Thanks a ton for the advice Tech! In the event I need to change the rear one (which i feel odd about since i cut the wires - i have soldered them, but then i read that the wires cannot tolerate much current resistance) - how do i do it? I can't see how i can possibly get the sensor out without dropping the exhaust - is there another way? Thanks again for the help!

 

I do not know if your vehicle has an egr or not. But you can check that egr and since ford owns volvo your vehicle may have an egr position sensor or dfpe. a bad egr can cause stalling at lights and stop signs