Cleaned upper intake with seafoam now....

[sam hain]

So last night I bought some of the seafoam upper intake cleaner and fogged my truck. I followed the instructions but this morning on the way to work I noticed when the AFM switches from v4-v8 it shutters and it wasn't doing that before. Is it possible when I disconnected the intake the MAF sensor got out of whack because the airflow was disturbed and it will reset or have I messed up something? Thought about disconnecting the battery this afternoon and seeing it everything will reset. What's strange is the video I watched on how to do the process on seafoam's website is the 5.3 GM engine.

[HeySkippyDog]

3 ignition cycles will clear the CEL due to the MAF sensor disturbance from removing the intake tube and spraying cleaner. As for shuddering, V4 mode has a way of doing that.

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[sam hain]

Well I don't have a CEL. After doing the spray I let it sit for 10mins then drove it hard for about 10mins until the white smoke stopped. Did some 20-90mph WOT pulls and it ran great. I also did not spray anything near the MAF, I sprayed the cleaner directly into the throttlebody.

[BeerPwningTexan]

Did you throttle engine and hold at 2000rpm's while applying entire contents of can before the 10 minute heat soak phase? 

[sam hain]

39 minutes ago, BeerPwningTexan said:

Did you throttle engine and hold at 2000rpm's while applying entire contents of can before the 10 minute heat soak phase? 

Yes I did, my dad was rev'ing the truck to 2000 while I emptied the can in the throttlebody.

[sam hain]

I'll drive it hard on the way home and see if anything changes. Other than that I'm lost.

[BlancoSilverado]

3 hours ago, sam hain said:

I'll drive it hard on the way home and see if anything changes. Other than that I'm lost.

let it warm up before mashing it.

 

This will make sure that the CATS are up to temperature to let anything burn off.

Edited August 21, 2019 by BlancoSilverado

[sam hain]

6 minutes ago, BlancoSilverado said:

let it warm up before mashing it.

noted.

[1SLOW1500]

Sounds like the maf tables are relearning. Or the throttle body and baro. I would reset and drive.

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[sam hain]

It drove fine on the way home, thanks guys.

[sam hain]

Cleaned my dad's '16 sierra 5.3 last night but he bought CRC intake valve cleaner. His procedure was different from mine with sea foam. I think next time I'll try the CRC. According to some info I found you're supposed to clean theses direct inj motors every 7k miles.

[1SLOW1500]

Truck just had to relearn is all. I have heard dozens of ways to do this seafoam clean. And I do believe in it but not sure some methods are so good.
So do the 3rd in gas tank, 3rs in oil and 3rd in the intake. Some people pour it into the intake[emoji15]

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[kennerz]

Good practice is to change the oil after a seafoam/CRC solvent style cleaning. Stuff can get by the rings and thin/dilute the oil. After you all done messing around do yourself and your engine a favor and get some fresh oil in there.