2002, V70, 2.4t and the dirty rotten throttle body

equiprx · Post by **equiprx** » 10 Aug 2018, 17:39

Does anyone with actual Volvo mechanical credentials know how I can spray Sea Foam Spray or another product into the intake/throttle body without removing it? The stuff will kill the MAF sensor and probably other important stuff.
I have been trying to get the P0068 & P0221 codes to go away.
My car is a 2002, V70, 2.4t and the throttle body can only be accessed by removing the fuel rail, intake manifold, intake pipe, upper coolant hose, Power steering line and a bunch of other stuff.
So far all things tried have had no permanent effect and some were nearly disastrous.
A very expert forum helper tried but did not have intimate knowledge of the components involved.
The same goes for the PCV system.
I have been trying to get these things fixed as best I can for nearly a year, but I'm only moderately able to diagnose and too poor, old and infirm.
All help will be greatly appreciated.

dlundblad · Post by **dlundblad** » 11 Aug 2018, 05:01

FYI, I was able to remove the throttle body by ONLY removing the air box and ducting and electric fan. Very simple job really.. Just 4 bolts and you can just about stick your head down there to see what's going on.

The PCV system on the other hand is another story. I can't remember if that stuff can be accessed with the above method or not, but it'd be just as easy to remove it all. The PS pump and line can be just unbolted to be moved out of the way. The lines don't need disconnected. I replaced the candied line when I did the PCV system and removing the lower radiator hose made the job so much easier. I just replaced it at that time.

equiprx · Post by **equiprx** » 11 Aug 2018, 13:55

You should make a you tube video with your head down there. LOL
What's you opinion on disconnecting the battery?
I'll give it another look.
Thanks

dlundblad · Post by **dlundblad** » 12 Aug 2018, 17:54

equiprx wrote: ↑11 Aug 2018, 13:55 You should make a you tube video with your head down there. LOL
What's you opinion on disconnecting the battery?
I'll give it another look.
Thanks

It'd be glorious for sure.

The battery should be disconnected whenever electronic anything is being messed with.

Post by **prwood** » 14 Aug 2018, 09:38

Here are my thoughts as someone who has a 2001 V70 2.4T and has replaced both the throttle body and pcv system:

1. I'm not sure Sea-Foam will help with either the ETM or PCV issues. The ETM is likely a more permanent hardware issue, and if you have symptoms of a clogged PCV system, I doubt that Sea-Foam would clean up enough to make a difference.
2. That being said, if I was going to try getting Sea-Foam into the air intake while making sure that it didn't foul up any sensors on the way, it seems to me that you could pop off the IAT sensor from the intercooler-to-throttle hose and spray sea-foam in that way. There are no sensors between there and the throttle itself:

: Screen Shot 2018-08-14 at 11.29.33 AM.png (66.18 KiB) Viewed 3475 times

I think you could almost manage to do this without removing any other components.

3. When I got throttle related codes, I ended up needing to replace my ETM. I had it rebuilt by XeMODeX, and the rebuilt unit has been working great. In order to replace it, I had to move the power steering hard line, which allowed me to remove the fan shroud, and then access to the intercooler hose and throttle was pretty easy after that.

4. I will agree that both of these jobs are physically demanding. I'm two months shy of 40 and in average health, and it still wasn't easy for me. Ultimately, however, PCV and Throttle issues are likely not going to be cured by Sea Foam, so someone is going to have to do the job at some point.

equiprx · Post by **equiprx** » 14 Aug 2018, 16:06

Thanks for the info.
So I'm guessing the motor will run if that sensor isn't in the air-stream?

Post by **prwood** » 14 Aug 2018, 17:38

equiprx wrote: ↑14 Aug 2018, 16:06 Thanks for the info.
So I'm guessing the motor will run if that sensor isn't in the air-stream?

My guess would be yes, but that’s just a guess... I haven’t tried this.

Post by **abscate** » 14 Aug 2018, 23:07

It will but could also set a code if the temperature is implausible.

Post by **cn90** » 15 Aug 2018, 19:19

Cleaning the Throttle Body in the 2.5T engine is, in fact, VERY SIMPLE.
No need to remove Intake Manifold etc. etc.
All you need is to read this DIY I wrote a while back.
And it is FREE (other than the cost of the Brake Cleaner etc.).

DIY: 2005 XC90 2.5T Throttle Body Cleaning
viewtopic.php?t=78629

Post by **prwood** » 16 Aug 2018, 07:59

cn90 wrote: ↑15 Aug 2018, 19:19 Cleaning the Throttle Body in the 2.5T engine is, in fact, VERY SIMPLE.
No need to remove Intake Manifold etc. etc.
All you need is to read this DIY I wrote a while back.
And it is FREE (other than the cost of the Brake Cleaner etc.).

DIY: 2005 XC90 2.5T Throttle Body Cleaning
viewtopic.php?t=78629

That's the newer-style, more compact throttle body. In '01-'02 the 2.4T had a larger throttle body that is likely more difficult to maneuver. You can see one here attached to the intake manifold of my '01 V70 2.4T:

I had to remove the fan shroud to get mine out.