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- Hummer H2 (https://www.hummerforums.com/forum/hummer-h2-8/)

- - How do you use sea foam? (https://www.hummerforums.com/forum/hummer-h2-8/how-do-you-use-sea-foam-27192/)

Quote:

Originally Posted by finall (Post 398732)

Seafoam is a useless gimmick and does not work well. I used it and it………..just made a bunch of smoke. If you want smoke, this is the crap for you!

When I got the new H2, I used Shell gas and it killed my cats by plugging the. Changed cats, and now use exclusively Chevron withTechron for the last decade. No more problems. No Seafoam or other crap additives go into my baby.

Throw a bottle or 2 of Techron concentrate into the gastank and vrooom!

For the other guy on this thread: Not all top tier gas is the same. Different additives. Some are better than others, so you can not generalize.

IMHO

https://cimg5.ibsrv.net/gimg/www.hum...de71e1cf78.jpg
https://cimg6.ibsrv.net/gimg/www.hum...72be5ddf2c.jpg

Quote:

Originally Posted by Cashville (Post 273776)

it's most probably a clogged injector. I got the error codes P0171 and P0174 which point a cause as bad injectors, although they cleared after I started the car again.. I'll use sea foam, drive it like I stole it, then I'll see :D

Usually, if you see those two at the same time its a vacuum leak. Unless you got a batch of really really bad gas. But likely a vacuum leak. that being said seafoam in the gas wont hurt it. But for cleaning injectors you have to put it in the gas. If it is injectors you'll likely need to just get them professionally cleaned and tested. Or yank them and test them yourself. I'd start with a vacuum leak though. Very common on a car this old.