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Engine & DrivetrainDiscussions about the engine and drivetrain of your vehicle.
This is a discussion thread titled "Fuel Injector Cleaner?", within the Engine & Drivetrain forum, part of the Technical & Vehicle Assistance Forums category.
Originally posted by arkie6 I assume you are referring to the throttle body part of the injection system not being clean. I haven't cleaned mine yet, but from the looks of things, it's the crankcase ventilation system that is causing the gunk to build up around the throttle body (oil vapor from the crankcase breather hose enters the intake tube between the MAF sensor and throttle body). No amount of injector cleaner in your tank is going to have any effect on this. That will likely just require periodic removal of the intake tube and manual cleaning of the throttle body and butterfly with a good solvent. I typically use Berryman's B12 Chemtool Carb and Choke spray cleaner for this type of cleaning chore - it works really good at dissolving varnish and such on motorcycle and other small engine carburetors. And it is relatively inexpensive at Wal-Mart.
I cleaned my throttle body today and just wanted to clarify some info I stated above. The fresh air intake for the crankcase ventilation system enters from the intake tube between the MAF sensor and the throttle body (a 3/4" black hose from the right bank valve cover to the intake tube). However, the suction for the crankcase ventilation system is right at the top of the throttle body under that "4.7L V8" cover. There is an insulated black hose from that port above the throttle body to the PCV valve located in the left bank valve cover next to the oil fill tube.
At 29,600 miles I had a little black gunk around the throttle butterfly, but most of it was behind the butterfly and likely the result of oil vapor from the crankcase ventilation system. It cleaned up really easy with the Berryman's and a cotton cloth. You just have to hold open the butterfly, spray, soak, wipe up. I also removed my PCV valve (it's a press fit into a rubber grommet in the valve cover) and cleaned it thoroughly with the Berryman's. It had a little gunk on it but is now free and clear. I don't see any need in replacing it if you periodically clean and inspect it (it acts like a one way valve to let gases from from the valve cover to the intake, but not from the intake to the valve cover - after cleaning it, you can blow through it and see if it works correctly).
After I finished cleaning everything and buttoned it all back together, I noted that the idle speed seemed a little high. I re-checked all hose connections to make sure everything was on and tight and it was. I drove it 10 mlles and got some gas and it was still idling at 1200 rpm with the AC off. I checked again under the hood and everything was ok. I drove another 10 miles to get something to eat and it was still idling a little fast at 1000 rpm. Finally after making it back home and traveling a total of approximately 40 miles, it was idling perfect at 750 rpm. Kinda strange. I wonder if cleaning the butterfly and throttle body had that much effect on idle speed and the computer finally re-mapped the correct airflow values for the given conditions. Other than that, the truck ran great, but it always has.
The last time I saw this subject come up, I offered a free sample of AMSOIL's PI fuel additive to the first two people that contacted me. Seeing this come up again, I had to get permission to post some feedback. If I get permission from the other individual I'll post it here, but for now, Joseph Guerra (currently forget his TS username) said:
Quote:
I did use it in my New 02 Camry v6 SE (w/ 5,000 miles on it). Never before had I gotten even close to the freeway rating of 28 mpg, even thou I have taken it on many trips. I used it before going to the coast, On this trip we got over 29 mpg! 452 miles on 15.4 gal of gas! And it was not even all freeway miles, but rather it was about a 75/25 mix of highway and city! Also I don't recall the engine running so smooth or as good as it did on that trip. My overall impression of the Amsoil PI is I don't believe it , so im going to order another bottle or 2 soon. To see if this was a fluke or not.
Thanks again for the opportunity to try this wonderful product,
Joseph
And my personal experience on my 2002 Tundra was that my mileage improved from approx. 14.6 to approx. 15.4, and a noticeably smoother running engine...
FWIW, this product is used at a ratio of 1 ounce to 10 gallons of fuel following an initial 6 ounce treatment. Because my truck was so new, I opted not to perform the shock treatment and still got excellent results. It is very cost-effective, as fuel treatments/injector cleaners go...
~ Fred
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Originally posted by RagerXS The last time I saw this subject come up, I offered a free sample of AMSOIL's PI fuel additive to the first two people that contacted me. Seeing this come up again, I had to get permission to post some feedback. If I get permission from the other individual I'll post it here, but for now, Joseph Guerra (currently forget his TS username) said:And my personal experience on my 2002 Tundra was that my mileage improved from approx. 14.6 to approx. 15.4, and a noticeably smoother running engine...
FWIW, this product is used at a ratio of 1 ounce to 10 gallons of fuel following an initial 6 ounce treatment. Because my truck was so new, I opted not to perform the shock treatment and still got excellent results. It is very cost-effective, as fuel treatments/injector cleaners go...
~ Fred
I just ordered two bottles of PI along with 5 gallons of ATF and 7 quarts of gear oil for the diffs and transfer case for my 30,000 mile service. So I'll give give you some feedback too.
I've always been really impressed with AMSOIL products.
George, I WANT to give you my feedback on this cleaner. You know how riddiculous I am about tracking mileage and all that stuff.
But I start the new job on monday. I can't bear to put 1600 miles on the tundra to go out to OH and back. I'm taking the wife's corolla.
When I get back, and get driving to BOS again on a regular basis, I will do the test.
I just found the oil kit you sent me. I think my wife had thrown it in the closet without telling me. If I didn't say so before.... THANKS. I still have about 6k miles till the oil change though.
I am out in Ohio. On my drive from Maine I was able to keep some mileage records.
I was surprised in my wife's corolla to get 39.9 miles to the gallon BEFORE the injector cleaner.
(This is not entirely accurate. It seems that I have about 3 percent error comparing the speedo to a GPS)
But.. just going with what I read of the odometer.....
I got about 37 miles to the gallon with the cleaner in the tank. (It was a pretty strong solution, as the car has only a 12 gallon tank.)
But today I took a drive of about 300 miles to see a friend. 43.9 miles per gallon. I can't complain about a 10% increase in mileage for a couple dollar bottle of cleaner.
We'll see if the results hold true on the drive home.
I just put two cans of techron in with my last fill up. I couldnt do the whole 12 gallons thing so i fgured if i threw 2 cans in and filled it up, 24 gallons in a 26 gallon tank sounds close enough.
It seems like my engine runs better and is more responsive now that i ran about 250 miles with that gas, but it seemed like it has less power when the techron gas was in there, and after filling up today i found out i got 13!! MPG on the last tank. I constantly get about 16.5 and dump techron in and get 13 what! I take it the techron makes the gas less potent or something?
Well I filled up with 91 octane today, first time ive used that as i usually get 87 and it really seems like the truck sounds better, runs better and actually has more power. Placebo? Maybe but i like it! Now only time will tell if my mileage will go back up. If not then something is really screwed up.
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I just put two cans of techron in with my last fill up. I couldnt do the whole 12 gallons thing so i fgured if i threw 2 cans in and filled it up, 24 gallons in a 26 gallon tank sounds close enough.
It seems like my engine runs better and is more responsive now that i ran about 250 miles with that gas, but it seemed like it has less power when the techron gas was in there, and after filling up today i found out i got 13!! MPG on the last tank. I constantly get about 16.5 and dump techron in and get 13 what! I take it the techron makes the gas less potent or something?
Well I filled up with 91 octane today, first time ive used that as i usually get 87 and it really seems like the truck sounds better, runs better and actually has more power. Placebo? Maybe but i like it! Now only time will tell if my mileage will go back up. If not then something is really screwed up.
Saw the same thing with my 95 avalon. Run better but took a hit on milleage per gallon. I forget what was the mpg, but definitely enough to raise my eyebrow. I watch the mpg closely, so when something goes wrong, I know it right away... Mpg went back up to normal after that gas tank was used.
I assume you are referring to the throttle body part of the injection system not being clean. I haven't cleaned mine yet, but from the looks of things, it's the crankcase ventilation system that is causing the gunk to build up around the throttle body (oil vapor from the crankcase breather hose enters the intake tube between the MAF sensor and throttle body). No amount of injector cleaner in your tank is going to have any effect on this. That will likely just require periodic removal of the intake tube and manual cleaning of the throttle body and butterfly with a good solvent. I typically use Berryman's B12 Chemtool Carb and Choke spray cleaner for this type of cleaning chore - it works really good at dissolving varnish and such on motorcycle and other small engine carburetors. And it is relatively inexpensive at Wal-Mart.
One note on this -- use Intake Cleaner for this, not carb cleaner! Carb cleaner is really nasty to the little plastic parts inside the throttle body, whereas the Intake cleaner is designed to be safe on them while still dissolving the gunk.
Just put in Primrose Injector Perfector, and I didn't notice an increase in mileage (going only by the computer, which everone knows is off), but at the same time, I just put on Bridgestone Dueller AT Revos, which some claim lowers gas mileage. I will see how the 3 oz on the next fill up does and what the real gas mileage is based on the fill up. I was hoping to see above 20 on the computer indicating about 17 to 18 in reality, but the computer is ready 16.1 from the last fillup, so I'm probably still at 14 or so. I also just changed the plugs and found one loose and all of them with almost double the gap. If I don't get better mileage out of all this, then it's just not meant to be. I'm also running a K&N filter by the way. 15 mpg was my best before the Primrose, tires, and plugs. Will update.
I was noticing hesitation when I first was taking off from a stop. When I bought it used, it was doing that until I had the dealer perform a fuel system clean, but the smoothness I noticed after the clean did not last long. After 4 months or so, it started doing it again prompting me to try the Primrose. The initial hesitation has already gone away it appears. Again, will update.
Use TechronFuel Injection system cleaner. Black bottle with long skinny neck.
It is an industry standard. Trade publications indicate this stuff to be leaps and bounds above any other commercially available stuff out there to date. It will correct the pulsed spray pattern to like new as long as the injector pintles are not damaged.
This stuff does work .. Over the years I've seen it save many dollars in correcting poor spraying injector "pintles" compared to replacement.
There are two different size bottles of this stuff. One for 12 gallon tanks and one for 20 gallon tanks.
Don't let the price scare yu . It is more $$ than any other stuff. But it is proven stuff. Any other stuff is mere brand hype!!!! I.E. STP etc. just a waste of your money.
Used approx once or twice a year ,(or per directions) your injectors should outlive your engine in my opinion.
I just put two cans of techron in with my last fill up. I couldnt do the whole 12 gallons thing so i fgured if i threw 2 cans in and filled it up, 24 gallons in a 26 gallon tank sounds close enough.
It seems like my engine runs better and is more responsive now that i ran about 250 miles with that gas, but it seemed like it has less power when the techron gas was in there, and after filling up today i found out i got 13!! MPG on the last tank. I constantly get about 16.5 and dump techron in and get 13 what! I take it the techron makes the gas less potent or something?
Well I filled up with 91 octane today, first time ive used that as i usually get 87 and it really seems like the truck sounds better, runs better and actually has more power. Placebo? Maybe but i like it! Now only time will tell if my mileage will go back up. If not then something is really screwed up.
Your missing the point here for using Techron....
And always use the Correct ratio!!
It is NOT meant to increase Mileagewhen it is mixed to the tank of fuel. It is a detergent/ cleaner and as a result is not expected to increase mileage during the initial Techron tank fill.
It is a good cleaning agent. Nothing more.
All the other stuff out there should never claim continued use increases MPG. This defeats the concept of a cleaning agent.
And other companies just want to hype MPG regarding their products because it might sell better!!
And people will just use it as a regular Tank fill additive all the time. That's Dumb!! And even dangerous to the fuel system overall!
Your MPG should be measured AFTER a fully depleted tank!!! Not during Use of Techron Filled Tank!!!
My Toyota service manager reccommended BG44K to me years ago when I owned my first Toyota with Fuel Injection. I've used it religously since and highly reccomend it. I agree with the last post. These cleaners aren't intended to directly improve mileage. They are meant to clean your fuel line components and injectors. Fuel mileage improvements is a benefit due to better atomization of fuel thereby improving efficiency of the burn.
BG 44K is about 12 bucks a can and you can find it and associated products for oil treatment and transmission treatments on line and at ebay for cheap.
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