Alokat007

Today i removed the manifold because of the hesitating i felt lately and i found carbon deposits
The car has about 200 Mm (Megameter)


I even opened the manifold in half and i found too much of sludge and carbon deposits and the injectors were in bad shape barely made any spraying i soaked them in paint thinner for 2 hours and then i used fuel injector cleaner spray and now they are good as new, and i cleaned the manifold with Jif Cream and boiled water. And for the intake valves i cleaned them with engine degreaser but it was not very helpful as the disc brake cleaner which it was more effective to remove the carbon deposits.

But now i think the cylinder head may have the same issue as the manifold, i read about opening it and people say its very difficult for newbies because it involves in removing the time belt and pistons.

-Does anyone know if the carbon deposits may be also in the cylinder too or not? Because i don't want to open it and i may not be able to restore it right.

mrblister

How many miles are on your car. ? I would not suggest you tear into it any more. There are additives that you can use that will promote cleaning the combustion chamber.
Many auto parts store carry them .

Coleroad

Is this a sc430? Looks like a is250.

Alokat007

After cleaning

Are you satisfied now?


I used before 2 bottles of Toyota injector cleaner...

Like this bottle

... but it didn't do much.

Bgw70

The picture in your first post looks like normal carbon buildup.

what kind of hesitation are you experiencing?
is the hesitation all the time or most of the time?

cleaning the injectors was a good idea but I think you should put the intake back on and go drive it...don't take the heads off!

after the test drive and the engine has cooled down, I would clean the external parts of filthy engine! ;-)

Bgw70

Take a look at this thread, is the hesitation similar and have you ever performed this procedure?
if you have a different problem, I stand corrected.
https://www.clublexus.com/forums/sc4...ottle-lag.html

from Harold57
The easiest method to reset the ECU is to go through the procedure below:

If you want to reset the ECU without losing your seat and stereo settings, perform the following procedure:

1. Get in your car and insert key. (It doesn't matter if you close the door or not.)
2. Turn the key to the on (not start) position.
3. Press the gas pedal to the floor.
4. Hold the pedal to the floor for five seconds, then turn the key back to the "off" position (don't remove the key), then release the gas pedal.
5. Wait 2 minutes.
6. Remove key.
7. Done

Coleroad

you took that wrong. People post other car models in the sc 430 section pretty often, that's why I asked. Have you changed your pcv valve?

ShawnOk

iTrader: (1)

Second to cleaning the throttle body, running Seaform through the PCV valve made a huge difference in my performance (best mod is still the trans pressure mod, tho). Do all three and any SC430 owner will feel the true, unrestricted performance this V8 was meant to have.