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Throttle body cleaning for the 850[ALL/1998] posted by Leo Montreuil on
Tuesday, 13 May 1997, at 2:45 p.m.

I have been told by the dealer and I read in a newsgroup that the throttle body needs to be cleaned every 30K miles. This maintenance item is not listed in the owner manual or in the Haynes manual for the 850. Is there a document or service bulletin from Volvo addressing this issue. Also, how do you clean the throttle body?

Thank you


Re: Throttle body cleaning for the 850[ALL/1998] posted by Nick Gidakos on
Tuesday, 13 May 1997, at 4:44 p.m.

Hi there,

I had the same thing told to me by my MD dealer at 20K. The throttle body needs to be cleaned (a nice expensive one-something like $60 to $80). I was sceptical and I said why do you think it needs to be cleaned. The service advisor said that the car is running rough and if the service was done it would run smoother. I said that I drivr the car and my wife drives the car and we did not notice any idle roughness. As of today I have 26.8K on the car and I still think it runs fine. By the way I finally order the Haynes manual from the UK. I am expecting in the mail(you advice me about its existence).

Thanks

Nick

PS: if you find out anything about the throttle body let me know or post it on the bricknard I am interested. Nick


Re: Throttle body cleaning for the 850[ALL/1998] posted by Michael McBroom on
Wednesday, 14 May 1997, at 1:43 a.m.

My local Volvo dealer gave me similar advice for my 740 Turbo -- injector service every 30k miles or so. Injector service at the local dealer consists of removing and cleaning the throttle body and adding a bottle of Techron gasoline additive to the gas tank.

My car is running a bit rough and a bit rich, so I'll be following their advice to see if this helps.

Best,

Michael McBroom


Re: Throttle body cleaning for the 850[ALL/1998] posted by paul mohney on
Wednesday, 14 May 1997, at 10:18 p.m.

dear mike.

b/4 you jump overboard although techroline isn't a bad thing i have found better if you want to clean your fuel system injectors etc. i was turned into Slick 50 injector & fuel system cleaner, i found it at price/costc cheap but works really well, alco checl your injecto seals etc. but some good quality carb cleaner, and spray some around where you have seals intaske manifold,injector seals and like that, once you have all you potential leaks and stuff seealesd .check your air mass. or o2 detector and make sure it is doing whaat it is supposed to have fun, let me know how it goes

paul in santa ana


Re: Throttle body cleaning for the 850[ALL/1998] posted by Michael McBroom on
Thursday, 15 May 1997, at 1:51 a.m.

Appreciate the follow-up, but I tackled the throttle body cleaning chore and added the Techron today. Just from cleaning the throttle body, the car has smoothed out quite a bit. Will see if the Techron does any good. If so, down the road we go. If not, I'll look for the Slick-50 stuff you mention.


Re: Throttle body cleaning for the 850[ALL/1998] posted by Paul Elliott on
Monday, 19 May 1997, at 2:32 p.m.

Michael, I have an 850 Turbo...whats involved with the clean-the-throttle-body service? What, exactly, is the best way to get at the throttle body? Thanks..


Re: Throttle body cleaning for the 850[ALL/1998] posted by Michael McBroom on
Tuesday, 20 May 1997, at 11:38 a.m.

Paul Elliot wrote: "...whats involved with the clean-the-throttle-body service? What, exactly, is the best way to get at the throttle body?"

I've never removed the throttle body from an 850, although from what I hear, it is a simple task. To remove it from my 740, I needed a 10mm combination wrench, a regular screwdriver to undo the throttle switch wiring connector, and a phillips screwdriver to undo the hose clamps. It took about 10 minutes to remove it, about 3 minutes to clean it, and another 10 minutes to reinstall it.

One thing I didn't find out about until yesterday was that, when cleaning the throttle body, you should also remove the throttle switch and clean underneath it, as well. I'm guessing here that, since this switch is adjustable (at least on the 740 it is), you may want to mark its position before removing it to preserve its setting. You'll need gaskets for the throttle body and for the throttle switch.

Hope this helps.


Re: Throttle body cleaning for the 850[ALL/1998] posted by abe crombie on
Thursday, 22 May 1997, at 11:44 a.m.

Paul, This throttle cleaning thing is a much overused hold-over from the days when EFI systems did not have the capability to self adjust the idle control regualtion to make for small changes in needed air flow to maintain correct idle. During idle a certain amount of oil vapor from the crankcase vent system(which is normal) will collect on the throttle and the adjacent throttle housing. This oil vapor will collect the small particle dust that escapes the air cleaner due to its very small particle size but will be attracted to the oily residue on the throttle. If you drive what i consider normal (occasional periods of aggressive throttle and not oo much extended idling) this build up will likely never reach a point where it might cause the throttle to be a bit sticky to open. If your drivng habits do let this occur then a periodic (every 30k) ceaning with a solvent doused rag of the throttle housing is indicated. I recommend that this be done by removing the air hose and not by removing the throttle housing unless you're qualified to make the necessary adjustments to the throttle linkage once you're done. This grime is a fact of life that affects all makes of cars and the frequency that it needs cleaning if ever varies with the driver. No chemical cleaner added to the fuel tank would likely have any effect on the cleanliness of the throttle housing.


Re: Throttle body cleaning for the 850[ALL/1998] posted by abe crombie on
Thursday, 22 May 1997, at 11:48 a.m.

Paul, This throttle cleaning thing is a much overused hold-over from the days when EFI systems did not have the capability to self adjust the idle control regualtion to make for small changes in needed air flow to maintain correct idle. During idle a certain amount of oil vapor from the crankcase vent system(which is normal) will collect on the throttle and the adjacent throttle housing. This oil vapor will collect the small particle dust that escapes the air cleaner due to its very small particle size but will be attracted to the oily residue on the throttle. If you drive what i consider normal (occasional periods of aggressive throttle and not oo much extended idling) this build up will likely never reach a point where it might cause the throttle to be a bit sticky to open. If your drivng habits do let this occur then a periodic (every 30k) ceaning with a solvent doused rag of the throttle housing is indicated. I recommend that this be done by removing the air hose and not by removing the throttle housing unless you're qualified to make the necessary adjustments to the throttle linkage once you're done. This grime is a fact of life that affects all makes of cars and the frequency that it needs cleaning, if ever, varies with the driver. No chemical cleaner added to the fuel tank would likely have any effect on the cleanliness of the throttle housing.


Re: Throttle body cleaning for the 850[ALL/1998] posted by Leo Montreuil on
Friday, 16 May 1997, at 8:13 a.m.

I asked the same question on the Volvo Newsgroup. Here is one answer:

Will need to be done at some point in time. There is an oily/carbony (is that a word?) build up which accumulates and needs to be cleaned off. Carb cleaner will do the trick. Just remember to NOT mess with any of the settings! Pull off the throttle body and replace the gasket when reinstalling.

Mark Klein


Re: Throttle body cleaning for the 850[ALL/1998] posted by Michael McBroom on
Saturday, 17 May 1997, at 1:18 a.m.

I cleaned the throttle body on my 740 yesterday. I bought a can of Chief Auto Parts brand carb cleaner for the cleaning chores (it was a LOT cheaper than the name brand stuff), and it cut through the varnish and gunk instantly. On the 740 Turbo, it's about a 10 minute job pulling the throttle body off, and putting it back on is another 10 minutes, so the total job time is only about 30 minutes.

I too was careful not to disturb any settings on the throttle body. Nevertheless, when I fired up the engine after reinstalling it, the engine was idling about 400 rpm faster than before. I had to crank the idle adjustment dial in a fair number of turns before I got the idle back where it was supposed to be.

Best,

Michael


Re: Throttle body cleaning for the 850[ALL/1998] posted by Scott H. Noakes on
Friday, 16 May 1997, at 2:04 p.m.

Hi,

I had to do the same thing to my 240. There IS "oily/carbony" stuff that builds up in there (I think it is the same smutz that clogs up the flame trap). It can cause stalling on idle or rough idle, and it can hurt your mileage. For the 240 you can take the whole throttle body off and clean it up good. Or you can do as I did, cheap-out, and just get after it with a rag and a toothbrush. At the same time I added an 'intake-system/fuel injector' cleaner - don't remember what brand, and replaced the fuel filter. Some combination of these really helped - my mileage went up from ~22 mpg to~26 mpg, and the car idled a lot better.

Rgds, Scott




 


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