cleaned throttle body and holy c**p!!
- Thread starter thorridder
- Start date
steezemcqueen
Moderator
IMHO, The O gasket won't do anything on a NA motor. There has to be a reason why Toyota choose the D shape and I trust that they did their homework.
thorridder
New member
^^ that is true
Drcoffee
Senior Member
HCurphy, Actually, you are mistaken. There is a positive crankcase ventilation tube (PCV) that comes across from the back of driver's side valve cover and connects to the plastic intake just in front of the TB. That is far too much oily carbon coming from the Left side of the engine. I'd consider a compression check and an oil catch can.
In this picture, the RED vacuum line back by the firewall is the drivers side PCV line
Oil ingestion fouls the plugs by burning the oil in the cylinder. Blowby is when the gasses from the cylinder is forced by the piston rings into the crankcase and is sucked out by the PCV system. A little is normal, that amount looks to be abnormal IMHO.
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BrianSD_42
New member
Nice explanation. I was wondering about this.
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Drcoffee
Senior Member
WFT?? I currently own 3 vehicles with 125k, 138k and 160k miles and NONE of them have that kind of carbon oil build up infront of the TB. To go one step further, I've owned more than 30 cars personally and have always done my own maintenance and I have never seen that kind of crud since my 99 corvette with the supercharger and twin turbos that I personally installed, which because of the blow-by, I diverted the entire PCV system to atmosphere.
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Nunyabiz
New member
Well that makes me feel better about mine at least.
I just cleaned my TB 2 weeks ago and changed the PCV valve.
Only a tiny amount of crud on the bottom side of TB right at the edge of the flapper, basically clean compared to what yours looked like.
The PCV valve which was probably original with 161,000 miles on it was a bit dirty on the underside but not terrible.
I just cleaned my TB 2 weeks ago and changed the PCV valve.
Only a tiny amount of crud on the bottom side of TB right at the edge of the flapper, basically clean compared to what yours looked like.
The PCV valve which was probably original with 161,000 miles on it was a bit dirty on the underside but not terrible.
thorridder
New member
not yet, but im debating putting it in the shop or buying a couple other smaller things for it. got $700 in free money to play with.
Drcoffee
Senior Member
For those unfamiliar with the PCV valve, its a metering valve. With average vacuum it stays open and with too much it can close or restrict air flow. More importantly it's a fire stop. Since the PCV line goes to the crankcase with combustible gases, any kind of fireball from a backfire would need to be stopped. The little rattle valve slams shut to close the line in the event of a backfire. The passenger side is behind the throttle plate, whereas the drivers side is in front of the throttle plate where a backfire would have no affect. Some vehicles will combine both lines into one before the PCV valve.
Unfortunately there's no way to see the oily impact of the passenger side line without removing the intake runners. My intake runners and intake ports were fairly clean considering I have 159k miles.
Unfortunately there's no way to see the oily impact of the passenger side line without removing the intake runners. My intake runners and intake ports were fairly clean considering I have 159k miles.
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Throttle box stopped the t4r running -
:bravo:
My T4r stopped. The engine would run, and you could go 1 or 2 mph on the idle, but no more. Went to dealer and they said the throttle box was so corroded that the "message" wasn't going from the pedal to the box. They replaced a FUSE and cleaned it . Problem solved.
They did advise that it might be a broken part in the box, but to start with the cleaning. It's been a week and all is well. I do feel a bit more pickup acceleration and faster response. Over all , the dealer treated me well and even said they'd order my new DASH after I asked about the cracking. So I'm happy. I do not know much about mechanics, should have done more maintenance, and will in future. :bravo:
:bravo:
My T4r stopped. The engine would run, and you could go 1 or 2 mph on the idle, but no more. Went to dealer and they said the throttle box was so corroded that the "message" wasn't going from the pedal to the box. They replaced a FUSE and cleaned it . Problem solved.
They did advise that it might be a broken part in the box, but to start with the cleaning. It's been a week and all is well. I do feel a bit more pickup acceleration and faster response. Over all , the dealer treated me well and even said they'd order my new DASH after I asked about the cracking. So I'm happy. I do not know much about mechanics, should have done more maintenance, and will in future. :bravo:
SCH3CT3RSHR3DD3R
New member
Could you possibly answer a question for me? My 99 SR5 has some hesitation around 25 mph. It slows down as if im tapping the brakes. If i gas it, it stops. Only does this around 25 mph when I barely have my foot on the gas. thanks in advance.
Red Leader
New member
SCH3CT3RSHR3DD3R,
First thing to check would be spark plugs and wires. Good maintenance. Unless you changed them recently, do those and then report back.
First thing to check would be spark plugs and wires. Good maintenance. Unless you changed them recently, do those and then report back.
I had the same thing.
Cleaning the throttle body with it's IAC valve (dirty), and switching gas station worked for my situation.
Is this throttle body gasket the best to get since the TRD SC part number is now $35-40, and not the past $10?
https://www.lceperformance.com/Teflon-Heat-Isolation-Gasket-5VZ-Throttle-Body-p/1032085.htm
Of course, $2 D-shaped gaskets are available on Rockauto...
https://www.lceperformance.com/Teflon-Heat-Isolation-Gasket-5VZ-Throttle-Body-p/1032085.htm
Of course, $2 D-shaped gaskets are available on Rockauto...
weekendclimber
New member
Looks like a good option. I have just taken a dremel and sanded the "D" to an "O". Worked fine for me so far.
