2000 S70 AWD - Seafoam "Spray" treatment

[hmsky83]

Seafoam will attack carbon build-up, but it will also attack oil sludge, which is what might be all that is sealing some crustier valve seals that Robert is alluding to. Also as stated, it isn't meant to clean MAFs and Throttle bodies, there are much lighter solvents especially for that. As far as seafoam in the fuel system as a preventive cleaner, it will not cause problems, but may not do a whole lot to help either. The answer you may not want to hear is, if you are drivability issues that indicate the TB, you 'll just have to suck it up, and pull it to clean it. Probably just more steps than anything else. Normally, the TB on these gave problems electronically, not mechanically, but if your car is circulating a lot of oil in the intake from blow-by or turbo seals then you may need it.

That's exactly what I ended up doing. Ended up tackling that upside down TB LoL. Honestly it's time consuming but it's doable for anyone out there that's afraid as I was. If you put your head to it you can do it, it just takes time and the right tools. I just took it apart yesterday. To get to the TB I only had to take out the fan, the turbo tube, parts of the air box and disconnect some sensors and wiring in the way. The TB was extremely bad as my gut feeling was right. Now I have everything cleaned up and have many of the wiring harnesses readdressed in new 3/8 conduit.

My delema now is whether j put it a back together today or order the PCV kit online and tackle that too since I have all this room with the TB off ? Does anyone have any tips is it really that hard I'm just not sure if I will run into any thing difficult and regret it.

[June]

If you decide to tackle the PCV, order the updated banjo bolt. June

[hmsky83]

If you decide to tackle the PCV, order the updated banjo bolt. June

[hmsky83]

I guess the banjo bolt in this case is a M12 bolt 1.5 inches long that's hallow. Wow $16. There's one that's white looking for $11

[June]

Only buy the Genuine Volvo update banjo bolt! It has a steel ball that can get loose and destroy a cylinder effectively ruining the engine. My 2004 had the old design still, so your 2001 definitely has it. Buy this part from the dealer to ensure a Genuine part. What's $20 compared to the disaster of engine failure. Research the differences if you are going to buy online as you want the updated part.

The banjo bolt allows the crankcase gasses to pass into the intake manifold. I think the ball causes it to act like a old fashioned PCV valve. June

[hmsky83]

Only buy the Genuine Volvo update banjo bolt! It has a steel ball that can get loose and destroy a cylinder effectively ruining the engine. My 2004 had the old design still, so your 2001 definitely has it. Buy this part from the dealer to ensure a Genuine part. What's $20 compared to the disaster of engine failure. Research the differences if you are going to buy online as you want the updated part.

The banjo bolt allows the crankcase gasses to pass into the intake manifold. I think the ball causes it to act like a old fashioned PCV valve. June

Okay thanks I appreciate it I will look into that. So just to get it straight, the banjo bolt that doesn't have the ball that becomes loose is the updated one ?

There are seven clamps. Do you know what sizes they are ? because in those kits they include Volvo clamps that need this $22 tool just for the clamps and they don't advertise the sizes of the clamps so you can't go buy them yourself.

[volvolugnut]

This link should be good guide: viewtopic.php?f=1&t=28487 There will be some differences.

Opps! The link above is for P80 cars. I think you have P2.

volvolugnut

[volvolugnut]

This should be better link for P2 PCV service.
viewtopic.php?f=9&t=82460

volvolugnut

[June]

Only buy the Genuine Volvo update banjo bolt! It has a steel ball that can get loose and destroy a cylinder effectively ruining the engine. My 2004 had the old design still, so your 2001 definitely has it. Buy this part from the dealer to ensure a Genuine part. What's $20 compared to the disaster of engine failure. Research the differences if you are going to buy online as you want the updated part.

The banjo bolt allows the crankcase gasses to pass into the intake manifold. I think the ball causes it to act like a old fashioned PCV valve. June

Okay thanks I appreciate it I will look into that. So just to get it straight, the banjo bolt that doesn't have the ball that becomes loose is the updated one ?

There are seven clamps. Do you know what sizes they are ? because in those kits they include Volvo clamps that need this $22 tool just for the clamps and they don't advertise the sizes of the clamps so you can't go buy them yourself.

They all have a ball. Without it the positive pressure from the intake during boost would pass into the crankcase through the PCV box. At least it's my understanding the ball pushed to block the hole during boost then pulls back during vacuum to allow crankcase gasses to vent. So installing a empty bolt likely would cause problems. June

I am not sure about the clamps. Volvo uses those one time use clamps on a lot of hoses, can't think of the proper name, but I like them best. They never seem to leak when installed properly. So I'd use them. You sure don't want to have to go there again!

[hmsky83]

Only buy the Genuine Volvo update banjo bolt! It has a steel ball that can get loose and destroy a cylinder effectively ruining the engine. My 2004 had the old design still, so your 2001 definitely has it. Buy this part from the dealer to ensure a Genuine part. What's $20 compared to the disaster of engine failure. Research the differences if you are going to buy online as you want the updated part.

The banjo bolt allows the crankcase gasses to pass into the intake manifold. I think the ball causes it to act like a old fashioned PCV valve. June

Okay thanks I appreciate it I will look into that. So just to get it straight, the banjo bolt that doesn't have the ball that becomes loose is the updated one ?

There are seven clamps. Do you know what sizes they are ? because in those kits they include Volvo clamps that need this $22 tool just for the clamps and they don't advertise the sizes of the clamps so you can't go buy them yourself.

They all have a ball. Without it the positive pressure from the intake during boost would pass into the crankcase through the PCV box. At least it's my understanding the ball pushed to block the hole during boost then pulls back during vacuum to allow crankcase gasses to vent. So installing a empty bolt likely would cause problems. June

I am not sure about the clamps. Volvo uses those one time use clamps on a lot of hoses, can't think of the proper name, but I like them best. They never seem to leak when installed properly. So I'd use them. You sure don't want to have to go there again!

Was this close to ordering the parts for the PCV job then I got cool feet and chickened out SMH. I'm just going to put back the throttle body back on tomorrow morning and put all the parts back to normal. I stuck my phone under the manifold and snapped these pictures....not sure if there's anything that stand out ??