DIY: 1998 Volvo S70 GLT PCV Modification, how to get rid of smoking dipstick! There are a few threads/DIYs on how to overhaul the PCV (See REFERENCES section below). Many people overhauled the PCV only to find out they still have smoking dipstick (no increased in PCV pressure but simply smoking dip...

So you'd done the typical PCV repair and it ended up still smoking? If so, good to know this solves that!

Hrmmm. Well, what you really need, just to make sure that there are no non-ECU issues is a stock 98MY M4.4ECU. It will plug in and the car will run (*should*) OK, but the AC won't work. (We tested a '98V70R ECU in the wife's car for a bit, but it was WAAAAYY too aggressive). One from a '98 LPT car w...

Okay. I think I have found a 98 S70 GLT LPT manual ECU in a scrapyard reasonably close to me. My car is an auto, but I don't believe that should matter for this test but please tell me if I'm wrong. I will be going in the morning to pick it up. Thank you for the suggestion. That should be fine for ...

I've still got the car, it has 65,000 more miles on it now, it still has the hiss and it still runs great. I just never messed with it any further.

After upgrading to a bigger hose I got that hissing sound as well. 4 years later it still hisses, runs great and passes the glove test.

Yeah, I have the same hiss after upgrading to bigger/cheaper-than-OEM tubing. Was disconcerting at first, but I got over it! I figure I'll know if it stops working, because it'll stop hissing. Maybe a feature! Has the same exact intermittent CEL and bogging issues as before I fixed it, only differen...