Originally Posted by dr_gallup

In general, there is absolutely no need to clean fuel injectors as long as you are using decent quality fuel (i.e 99% of pump gas in the US, Canada, western Europe and most civilized places). I just got some 20+ year old fuel injectors back from some motorcycles that had sat for years and 8 out of 9 of them were functioning perfectly and still in spec. The one bad one had to be replaced. Of course, they sometimes fail like anything man made but in that case it's very rare that an ultrasonic cleaning or "miracle in a bottle" will actually accomplish anything useful.

Just look at the scheduled maintenance in your corvette owners manual or any other automotive owners manual. Did you find fuel injector cleaning in there? Didn't think so. Sure, I know, your uncle Tom's friend told you he uses nothing but Jimmy Johns injector elixir and never had a problem. I put up an umbrella over my head yesterday and the Chinese Space Station didn't hit me.

Originally Posted by HOXXOH

What makes them dirty? What problems does it cause? How do you clean them? Is it just a problem for low mileage low speed garage queens or long term (aka Winter) storage?

I'm curious to what it is about the chronological age of the car that becomes the reason for specific injector maintenance that supersedes the total engine revolutions or the fuel being used?

152K miles (3X the OP) on my '08 and original injectors never cleaned, other than using a regular diet of Chevron. Lot's of high RPM use too.

Originally Posted by dr_gallup

In general, there is absolutely no need to clean fuel injectors as long as you are using decent quality fuel (i.e 99% of pump gas in the US, Canada, western Europe and most civilized places). I just got some 20+ year old fuel injectors back from some motorcycles that had sat for years and 8 out of 9 of them were functioning perfectly and still in spec. The one bad one had to be replaced. Of course, they sometimes fail like anything man made but in that case it's very rare that an ultrasonic cleaning or "miracle in a bottle" will actually accomplish anything useful.

Just look at the scheduled maintenance in your corvette owners manual or any other automotive owners manual. Did you find fuel injector cleaning in there? Didn't think so. Sure, I know, your uncle Tom's friend told you he uses nothing but Jimmy Johns injector elixir and never had a problem. I put up an umbrella over my head yesterday and the Chinese Space Station didn't hit me.

Originally Posted by Cherokee Nation

Cheap fuel and crap in the tanks at a gas station.If you don't know what dirty injectors can cause then take a class.It's not rocket science....Chevron has a good cleaner in their fuel.....

Originally Posted by HOXXOH

I wasn't asking for me, but just as a general question so you could explain to others why the car's age created an injector problem. Maybe it'd be nice to help others to find where those injector classes are held.

Originally Posted by Bruze

Hey -- I took a class at the local college on how to check the oil. Covered it all in one semester and it was cheap: $1200.

Originally Posted by HOXXOH

I wasn't asking for me, but just as a general question so you could explain to others why the car's age created an injector problem. Maybe it'd be nice to help others to find where those injector classes are held.

Originally Posted by Cherokee Nation

I know it is not in the owners manuals.It will be in some service manuals.I like to maintain my fuel system like i did back in the day when all my cars had carburetors.I've rebuilted many of them because we did not get the good gas back then.

Originally Posted by Bruze

Hey -- I took a class at the local college on how to check the oil. Covered it all in one semester and it was cheap: $1200.

Originally Posted by Vet Interested

Did you pass?

Originally Posted by Bruze

I've never had "bad gas" ruin a carb. How does that happen? A carb was one of the most reliable pieces on those older cars.