possible intake manifold gasket repair?

[04rollaftw]

Hi all,

I cleaned the throttle body on my 04 corolla a few days ago and CEL came on after a few mins of driving. Car shakes/vibrates bad while idling. However I did not notice any difference in terms of power output. Took the car to the dealership came back with the following codes: P0171. P030#(0-4) multiple misfires. System burning too lean. They recommended manifold intake gasket 1st and testing o2 sensor after repair. stealership also wants 3hrs for the gasket........

How did this happen? I tried to fix it(without knowing the intake manifold gasket is prone to failure) by replacing the throttle body gasket and noticed oil on the old gasket. Asked a friend and he told me could be pcv valve/hose related leak and the vibration should be some kind of vacuum leak.

Car also has a whistle noise that changes tone with acceleration.

I looked at the TSB procedure and researched about the DIY but there not much info about this repair. Is there any tool/ clearance problem of any sort? or its just a really easy process? I have seen replies that say it can be done in 1hr.

I appreciate your input.

[mikered30]

Sounds like they are correct with the gasket issue. The tsb: http://ww2.justanswer.com/uploads/sk...rolla_0171.pdf

states that labor is 1 hour, I would print that out and ask them what the deal is on 3 hours for labor. They probably don't like people who do research first. If they give a BS excuse, take it to a different dealer or mechanic. Gasket is really cheap.

[04rollaftw]

Originally Posted by mikered30

Sounds like they are correct with the gasket issue. The tsb: http://ww2.justanswer.com/uploads/sk...rolla_0171.pdf

Thanks man, I was thinking about doing it myself. Is there any difficulty?

[mikered30]

Originally Posted by 04rollaftw

Thanks man, I was thinking about doing it myself. Is there any difficulty?

I just reread your post. Seems like the cleaning caused the codes. How did you clean your throttle body? On or off of the car while running? Did you use a whole can of cleaner? Was the cleaner for throttle bodies and was it sensor safe? If you cleaned it while on the car, the carbon cleaned out could easily cause a miss fire code. If it was cleaned off of the car, did you hook everything up ok and did the gasket seat ok?

What is your mechanical ability? The tsb goes step by step for the intake gasket. You do not have to remove the coolant lines, just remove the throttle body from the intake manifold, like you already did. You will need another throttle body gasket.

The oil that you saw could have been from a clogged PCV valve, it is wise to clean the throttle body with throttle body cleaner while it is off to get rid of the oil and carbon. Also clean the idle air control valve too, which might cause the shaking.

[Bitter]

cleaned the MAFS too?

[04rollaftw]

Originally Posted by mikered30

I just......

I cleaned the throttle body with CRC throttle body cleaner when its off the car. I tried to take the idle speed controller off but those screws didnt want to move. Ended up stripping 2 of them on the head. Guess need to drill those out at some point(dont have tool) or maybe just replace the whole assembly(used) that can be found online for cheap. I have cleaned the throttle body before and did not notice any oil but carbon. How did the oil get in there? Do I need a new PCV valve? People in the shop said it might be the hose.

I should have no problem following steps, was asking about the clearance just in case if extra long/short/special tool needed.

[04rollaftw]

Originally Posted by Bitter

cleaned the MAFS too?

Think I need a bottle of sensor safe for the MAF Thanks