Intake Gasket Replacement

[relee]

I remember seeing a detailed discription of replacing the intake gasket, cant seem to find it. Anyone know where its hiding Thanks

[mikered30]

P0171 - Intake Gaset Seal Repair - Tips

[invader]

Originally Posted by invader

1st pic shows elusive brake booster vacuum hose on intake manifold, which is hidden once throttle body is installed... Intake manifold gasket was easily replaced on friend's 2005 without draining any coolant or disconnecting throttle body coolant lines, by setting (+cleaning) throttle body aside.

[shoujiliuzhijun]

Directly copied from my post:

I got a P0171 on 2003 Corolla. That morning the temperature dropped. But except for the check engine light, I didn't notice anything abnormal.

I replaced the intake manifold gasket and cleaned the MAF sensor. After erasing the code, I've driven about 50 miles and according to my OBDII scanner, all the monitors are "ready". Hopefully the light will not come back.

For the intake manifold gasket, I found this website helpful:
http://toyota-solutions.blogspot.com...a-corolla.html
In addition to the instructions above, I also disconnected three pipes to set aside the throttle body, two on the top and one at the back(my rate-limiting step for removal and installation), and removed the 2 clamps of the engine wire from the clamp bracket. All the other tubes and wires remained attached. The old black gasket was solid as a rock.

Oh, one more thing: if you are using the Actron OBDII reader, be careful as the bottom of the adaptor may be stuck to the port on the car. In that case, don't simply try to pull it off. I've spent some time cutting a small portion of the adaptor.

[MD1032]

I just did this today. Literally, the only frustrating part is taking off the stupid engine cover.

The original intake manifold gasket was hard as a rock and the new one was very flexible, like silicone. It was a huge mess...it looks like it had been leaking for a very long time. The four intakes looked black on the inside. I did not attempt to clean the inside. The majority of the actual "work" was cleaning up the mess the old gasket left behind.

This is the easiest $200 I have ever saved, bar none. Took the car out for a quick spin and, surprisingly, the acceleration is much better. It gets to idle speed instantly now when coming to a stop. It took 5-10 seconds for it to get below 1000 before.

I sprayed everything afterwards with carb cleaner and the original hoses are all sealing great, they are in great shape. Very little fiddling to do. Took about 1.5 hours for me (looking for tools half the time of course). Never disconnected the air hose on the air box end...it isn't necessary. Couldn't figure out how to remove the hoses clipped into the back of it.

The original TB gasket was also in great shape. I will probably never have to replace it.

edit: Repair confirmed. I went out today and it was literally 10°F. Turned it on...idle is immediately lower than it was, about 1500 off the bat (2100 before). Pulled up to my usual stop sign where I get the intense revving between 500-2500 rpm from the fuel injectors cutting in and out...it held rock solid at 17-1800 ish. I know I can pay Toyota to flash the ECU to bring the rpms down when it's cold, but the thing runs so great now I don't want to touch it. It gets to idle speed the second I push the clutch in, no more wavering, and idles very smoothly. And the acceleration is way, way better. I can't wait to see how much better my mileage gets.