Okay...Tonight I removed the throttle body and cleaned it with throttle body cleaner. It was pretty gunked up. I also cleaned the Mass Air Flow sensor with MAF cleaner. That fixed the massive surge at startup/idle and it now idles normally at 700 - 800 rpms, but it still surges/pulses down then up ...

2000 S40 1.9T 115k miles

Last week my S40 started having "fluctuations" in the RPMs as I drove around town. It would rev up or down about 200 rpm and then back to normal a couple of times during my 20 minute stop and go commute. This week the frequency increased to about once per minute. Then it ...

My S40 was getting harder and harder to start (had to "crank it" for 5 - 8+ seconds to get it started) and then it ran roughly for the first minute or so. It would try to stall if you did not give it gas. I replaced the Fuel Pressure Regulator over the weekend and that fixed the problem. When I ...

I have been enduring a "hard to start" condition on my 2000 S40 for a while and putting off the repair since money is a little tight these days. With the help of this forum, I figured out that I probably needed to replace my Fuel Pressure Regulator. It seemed simple enough as a DIY project so this ...