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DIY: 2005 XC90 2.5T Throttle Body Cleaning Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
cn90
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DIY: 2005 XC90 2.5T Throttle Body Cleaning  Topic is solved

Post by cn90 » Mon Nov 21, 2016 4:04 pm

DIY: 2005 XC90 2.5T Throttle Body Cleaning

I have 2005 XC90 2.5T with 103K miles. Lately it has intermittent stumble at idle for 1-2 sec and that is all. On highway it runs fine.
Codes were P0101 (MAF code) and P2188 (too rich at idle).

New Bosch MAF ($130 on amazon dot com) did not solve the problem. See thread below.

P0101 , P2188:
http://www.matthewsvolvosite.com/forums ... 10&t=54634

I read somewhere that some people have success with cleaning Throttle Body. So I gave it a try and am glad I did!!!


PARTS/TOOLS

- Carb/Throttle Cleaner (about $4 at auto parts store). I bought my Carb/Throttle Body Cleaner from NAPA auto parts. It is basically a mix of acetone and alcohol plus some other chemicals.

- Throttle Gasket, PN 8636753, about $4-$5 at Volvo dealer. Don’t use aftermarket gasket.
It was Sunday, so I re-used my gasket (still looked good), but you should use a new gasket.

- Torx #25 key, 8-mm socket, 7-mm socket, 1/4-inch ratchet.

- Latex gloves.

- Budget about 1 hour for this DIY.

Volvo-2.5T-TBody-01.jpg


PROCEDURE

1. Study the photo below b/c you work from above and need to know the locations of the 4 bolts.
- I did not disconnect the battery in the trunk. I just paid attention to the fact that the starter motor is nearby. I guess you can place a rag over the starter motor just to be safe. Of course, the other option is to d/c the battery.
- The XC90 engine compartment has enough space on the driver's side, so I removed the TB through this space without the need to remove Fan Shroud. The S60 and S80 people may want to chime in re ? necessity to remove Fan Shroud etc.

Volvo-2.5T-TBody-02.jpg


2. Remove Intercooler Plastic Pipe (7-mm socket for the 2 clamps, Torx #25 for the Pipe).

Volvo-2.5T-TBody-03.jpg
Volvo-2.5T-TBody-04.jpg


3. BTW, for the MAF, I have played with it a few times (changing the MAF with new thinking it was a bad MAF). I hate prying the plastic pipe, so I replaced the “Security Torx” screws with standard screws. It makes swapping the MAF element a snap.

Volvo-2.5T-TBody-05.jpg


4. Reach your hand underneath for the clamp, undo the 7-mm clamp and disconnect the plastic inlet pipe (that feeds the Thorottle Body) and tuck it sideway as shown, this way you have full access to the TB.

Volvo-2.5T-TBody-06.jpg


5. Feel around for the 4 bolts, refer to the diagram above, don’t lose the bolt. If you drop it, chances are it lands in the splash shield (that you normally remove to change the oil). I think the tightening torque for the TB bolts is around 10 Nm, basically finger-tight then twist it a bit tight. I reached underneath the manifold from the driver's side: there is enough space for my right arm to reach the TB!

6. Slide the TB toward the left side (driver’s side), you will see the connector. Use a small screwdriver and GENTLY pry the tab to disconnect it from the TB. Now you can take the TB out for cleaning.

Volvo-2.5T-TBody-07.jpg

7. At 103K miles, my TB didn’t look too bad but there was some carbon buildup. Wedge the plate open to clean it.
NOTE: when cleaning the TB, hold it so the electronic side is UP (the black box that contains the gears and electronics), this way cleaning chemicals don’t get inside the black box.

Volvo-2.5T-TBody-08.jpg


So my theory is: the factory design has the plate a bit ajar at idle (play with it and you will see). This allows small amount of air to flow at idle, enough to keep the idle at 600-700 rpm or so.
When carbon buildup happens around the edge of the round plate and on the housing, air flow at idle is reduced ---> creating rich mixture, but it is in a strange way, it is RICH but it lacks air ---> engine stumbles at idle ---> ECU corrects it to prevent stalling.
Anyway, just a theory, so far so good, the P0101 and P2188 codes did not come back after 100 miles.

PS: I never did the “adaptation thingy”, if you have the VIDA software, then I guess you can do it. I didn’t and the car runs just fine.
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Re: DIY: 2005 XC90 2.5T Throttle Body Cleaning

Post by RMK221 » Tue Jan 10, 2017 6:45 am

Thanks for this and your other awesome contributions cn90!!

Been a member for awhile but just started undertaking these DIY jobs last month. She is a 2005 xc90 2.5t with 198,000miles.

Guide was easy to follow, only thing I did different was disconnect that top hose from the back (where it connects to turbo) and wiggle the hard hose over strut brace bar and to left, my inlet hose looks awful and was nervous of trying to disconnect it, lol.

Very easy and inexpensive job, used about half the CRC Throttle Body Cleaner can.
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cn90
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Re: DIY: 2005 XC90 2.5T Throttle Body Cleaning

Post by cn90 » Sun Jan 21, 2018 10:35 am

UPDATE 14 months later.

So far so good, zero issues!


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jordank
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Re: DIY: 2005 XC90 2.5T Throttle Body Cleaning

Post by jordank » Mon Mar 11, 2019 7:09 pm

Thank you! This saved me, and was absolutely the cause of my P0101 and P2188 codes.

I had already replaced MAF, checked PCV system, checked for vacuum/other leaks, and was about to replace the vacuum/temperature sensor.

Cleaning the throttle body fixed the problem (even though it didn't look too dirty, 2005 Volvo xc90 with 188,000 miles). 5 months and 5,000 miles later - issue has not returned.



cn90
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Re: DIY: 2005 XC90 2.5T Throttle Body Cleaning

Post by cn90 » Sat May 18, 2019 10:00 pm

I was looking at the 2005 XC90 2.5T engine today.

Once the Throttle Body is out, one may be able to remove the Oil Trap for cleaning WITHOUT removing the Intake manifold.
There is enough room, once the tube feeding the TB is out, undo:
- Top 2 hoses.
- Rubber Elbow.
- Two 10-mm bolts and the oil trap is out.
- To re-install, use worm-type clamps and not Oetiker as there is no room to use an Oetiker clamp tool.

I think this should work if one is skilled enough to do this without removing the I.M.
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Re: DIY: 2005 XC90 2.5T Throttle Body Cleaning

Post by ndphotonl » Sun May 19, 2019 6:36 am

Good tip!


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Sparky111
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Re: DIY: 2005 XC90 2.5T Throttle Body Cleaning

Post by Sparky111 » Mon Sep 02, 2019 1:33 am

I had very similar symptoms with my newly acquired 2005 CX90. Shortly after starting the vehicle the revs would lower to around 600rpm and you could hear the eng whine up and down. It wasn't so bad when the engine was cold but once it was warm it would really surge and if you stopped at traffic lights and didn't have the brake pedal pushed down firmly you could feel the car wanting to creep forward in sync with the revs going up. We took it to a mechanic and they replaced the MAF (costing $400NZ!) and were told to run the car for a week and see if it fixes the problem before spending too much money chasing problems. It seemed to help but I knew driving it later that day that the problem had returned and it wasn't fixed at all. Which is when I googled the issue and found this thread!

A week later I bit the bullet and decided to give it a go. And after performing the throttle body cleaning operation the engine idles beautifully and changes gears a lot more smoothly. We've noticed the engine more quieter as well. Overall it has improved the running of the car massively! I haven't had too much time to monitor it but I suspect the fuel efficiency is better too.

Just in regards to the cleaning, I tried cleaning the throttle body without removing the actual throttle body (which id seen a youtube video of a guy doing) and it was messy and impossible to get it fully cleaned. Removing it took a while since your pretty doing it blind but its well worth it. I'd say the whole operation took about 2 1/2 hours, not 1 hour as mentioned.

All in all I was so happy to see this post and even happier to find it works! Thank you so much cn90!



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Re: DIY: 2005 XC90 2.5T Throttle Body Cleaning

Post by ndphotonl » Fri Sep 20, 2019 2:01 am

Good to hear it had good effects on your car :D


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