1999 S70 T5 - What is normal fuel pressure?

Post by **misha** » 14 Mar 2015, 09:38

I agree with draser.

Post by **kallekula** » 14 Mar 2015, 11:26

draser wrote:If it's running lean, i.e. fuel trims are positive, you'd be rather interested in air leaks. Plug in scanner with engine warm, watch STFT and rev engine to 3k steady. If trim goes closer to zero you have air leaks.

Yeah I've tested all that. It has a small vac leak somewhere around the turbo but it doesn't seem to affect LT to that extent. I haven't checked the exhaust for leaks yet.
Ordered a Dice unit that should arrive any day now. Gonna hook it up and try and figure out what is going on. Feels like either exhaust leak or bad O2 sensor.

Post by **misha** » 14 Mar 2015, 12:21

It wouldn't run lean if o2 sensor is bad.

draser · Post by **draser** » 14 Mar 2015, 13:18

Now I agree with misha, o2 sensors fail rich.

Post by **kallekula** » 14 Mar 2015, 13:24

That was news to me, u sure about that?

Post by **misha** » 14 Mar 2015, 14:42

Yep...engine management is programed in that way.