Throttle body and MAF sensor cleaning on 3.7l I-5 H3
It was time to change my air filter so i decided to check the Throttle body and give it a scrub down too.
I think this took me about an hour to complete. Itís not difficult at all, just take care with the MAF sensor as it is a sensitive piece of equipment.
To start, the tools i used:
10mm nut driver
Phillips screw driver
The cleaning sprays I used:
1. Disconnect battery.
2. Disconnect plug at MAF sensor.
3. Loosen 2 clips on the air box lid and the hose clamp on the air outlet hose between air box and resonator. I removed the hose at the resonator so that I could remove the air box lid and hose assembly that houses the MAF sensor all together.
4. With the air intake out of the way you now have access to the vortec resonator. Loosen and remove the 2 bolts (10mm) that hold the resonator to the valve cover and loosen the hose clamp where the short air outlet duct attaches to the TB. With the resonator loose you can swing it out of the way in order to access the 4 bolts (10mm) that hold the TB.
5. Disconnect the sensor plug and the vacuum hose on the throttle body.
6. Loosen the 4 TB bolts and remove, holding the TB as it will fall away once the last bolt is taken out.
7. With the TB removed I took it to the work bench and cleaned it down with the TB cleaner, an old toothbrush, and a lint free rag. what a difference.
8. With the TB clean I allowed it to dry and attacked the MAF sensor (gently).
9. The MAF sensor is mounted in the air box lid, where the air inlet hose connects, with 2 Philips screws.
Removing it is easy, just be sure not to touch any of the inner workings as this is a delicate and expensive instrument. To be safe I didnít touch anything that resides inside the air intake. Sorry about the out of focus pics here. I didnít realize until everything was reassembled.
10. Spray down the sensor using the MAF sensor cleaner only and allow it to dry thoroughly.
11. Leaving the MAF sensor to dry, reinstall the TB in the reverse order of the tear-down. Check your gasket where the TB bolts on. Make sure it doesn't need to be replaced and the it is free of debris before installing the TB.
12. At some point go back to the MAF sensor and secure it back into it's housing.
13. Might as well replace the air filter and then install the air box lid/inlet hose.
14. Reconnect battery