I was cleaning the intake on the 1994 Q45t, this evening, and noticed this notch. It is perfectly smoothe, but I know my other 1994 Q45 does not have it. I wonder if it is a late model thing, or a touring model thing. It looks like the TB has been replaced, and the plenum has been removed at some time.

Attachment: tb.gif (60218 bytes, downloaded 635 times)

Lola - 94 Q45t, 203K miles Ice T - 00 I30t Sport, 150K miles Lana - 04 M45, 53K miles

It looks perfectly normal to me... I dont know why they woudl replace the TB???

The car ran much better, today, after the TB & MAF cleaning. As long as Idon't go WOT, the car drives superb. It beggs to be opened up (or is that me begging to open her up?).

I think it is from a big-fisted mechanic, in a hurry to re-assemble the car. I hope it isn't what is causing the car to bog at WOT.

If cleaning the TB & MAF will net better performance, I'm all game.

Jeff - do you have any special instructions on how to do this for a non-mechanically inclined fella like me?

Wes - do you have a write-up about this that you can share?

Basically, use a full can of electrical (brake) cleaner, on the MAF, and a full can of Throttlebody (Fuel Injector NOT Carb) cleaner on the TB and inside the plenum. Hold the butterfly open with a screwdriver - it is much easier that way.

Eventually, the fluid running out of the TB is clear.

It is REAL HARD to start the car, once you clean the TB. You might want to let it dry for a while, before starting it.

EDIT: Based on the additional info below.

It leads to a tiny orifice on the outside of the TB with a hose connection, and it gets all funky in cars that are "granny-driven".

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There should only be a slight gap or any passage, as the IAC will take care of the rest.....

You can clean the TB with the TB still on (but will do a marginal job), and you can clean the plenum without taking it off... But eventually its going to need to be taken off to be THOROUGHLY cleaned....

If this work I am agreeing to involves cleaning the TB, is it safe to assume that I don't need to clean the TB just as Jeff is doing above?

The BG fuel rail flush is the only good on vehicle one of which I am aware. I bet your dealer doesn't offer it.

Look at the http://www.bgprod.com site and find a shop that does. Don't believe the icons, call the shop first to confirm.

Discover the power of the button!

Just like BG44k isnt meant to clean dirty injectors... to keep clean ones clean.....

Put some towels under the TB, to catch the nasty stuff, so it doesn't get on the rocker covers!

Did you see the half-moon shaped piece cut out of the dark plastic ring, inside your plenum?

Rocker covers? What? You lost me. I'll grab a towel next time though. :)

I didnt check for the plastic ring thing. It was almost 6pm on a dreary and I really couldnt see it if I tried. The lighting in those photos is thanks to the camera flash.

I know hte feeling, with the flash. It is really ahrd to use the camera as a flashlight. It tends to give you a headache.

Isn't working in the dark cool?:D

Tomorrow I'm going to remove the air duct and take more pictures. I'm also curious about this moon-shaped thing youre referring to.

-Jesda

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Originally posted by elwesso If you get the car to backfire through the intake and open the injectors at the same time, that should REALLY blow some crap out (and more in) :D

LOL at Wes! :D

I'm anal and don't clean the TB on the car, the emulsified gradoo can run down the plenum & make a mess.

Either way it's a PITA to get it good & clean, but if it's off the car you can be certain you don't miss any spots.

Related comment, kinda.....if any of you guys plan on getting an Eaton charger, for Chrissakes never, ever, ever spray that stuff in the throttle body on the car. The rotor set is coated with teflon and that stuff comes off as fast as a prom dress if carb cleaner runs through it.

In order to get sparking, you MUST remove and scrub (or use my paint/varnish remover method!)... Perfection is a PITA to achieve!!!

BTW: if it's really Teflon applied properly, carb cleaner can't touch it. Go to DuPonts web site and read the resistance charts. Flourine is spooky stuff when you add it to polyethylene or polypropylene.

I absolutely agree with you Wes. After cleaning mine, I am convinced the best way to clean it is to take it off and do it right. The caked black mass of hard crisby pan baked crustatious barnicled crap just doesn't come clean with the tooth brush and cleaner while still attached to the plenum. You clean get it a little clean but to really spit shine the inside and get all your performance back, take it off and clean. You get better angles and can really get it from the other side without all that cleaner dripping down your cars throat. The difference is incredible IMHO.

It's a pain,but worth it.

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Only problem is, you will see how dirty the plenum is and then youll want to remove that and get it clean... Then youll see how dirty the intake runners are, and want to clean those as well.....

Its a never ending process to perfection!!!

SSSHHHHH! You'll scare people off..... You are sooooo right.

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If the oem air filter is changed frequently, the oil has a high evaporation point, and the combustion exhaust is optimized [egr only open at highway cruise] not much dirty stuff gets into system.

Think about it.........as this stuff creeps down the runners the gasoline spray washes it into the cylinders.

Keeping the plenum clean adds to engine longevity.

The manual scrubbing gets the TB and its neck clean before you use the BG fogger.........less get washed into cylinder that way.

Keeping injectors clean means less variance in fuel delivery and a cleaner exhaust and less junk going up egr tube into plenum.

I had a guy with a Jackson Racing Eaton on a 94-01 GSR. He sprayed carb/tb cleaner into the tb. It ran into the charger & large sections peeled off & were ingested. Keith Taber (Tech Dir @ JR) confirmed the Teflon based coating on the rotor set will be destroyed in that scenario.

Result, average rebuild cost $800.

I have not tried this yet, but a freind, who restores old cars, uses it to get 40+ years of gunk off of engine parts. He says it is amazing. He told me about a web site, but couldn't remember it. I plan to try this method, when I disassemble my 42 year old truck, this winter.

I wonder if this would work on the Plenum?

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