Did you add the fuel injector cleaner to cure some kind of problem or did
you add it as a preventative measure? In the future, do not routinely add
fuel injector cleaner unless you are trying to address a specific symptom
because over use can damage the injectors, fuel lines, seals, and idle air
Also, fuel injector cleaner must be used exactly according to the directions
supplied with the cleaner. If you do not use up the fuel in the tank
quickly enough, the stuff can damage injectors, fuel lines, seals, and the
idle air control valve.
I suspect that the fuel injector cleaner loosened deposits on the idle air
control valve and it does not move enough during warmup.
Try cleaning the throttle body and IAC valve with aerosol carburetor
cleaner, being sure to wipe out the liquefied gunk. Spray the edge and
inner surface of the throttle plate and the openings for the idle air
The engine will probably blow clouds of smoke the first time you start it
after cleaning, but it should clear up after a minute or so.
Chevron doesn't mention that on their web site because they would sell less
If it was a good idea to routinely add fuel injector cleaner, automakers
would put it on the list of maintenance items in the owner's manual and
factory service manuals.
As a former factory rep, I can assure you that it is not necessary to
routinely add fuel injector cleaner as a preventative measure. If anything
the quality of fuel at the pumps seems to have improved over the years,
reducing the need for fuel additives. The same goes for motor oil,
transmission fluid, and coolant additives.
At this point, use up the any remaining fuel as quickly as possible, re-fill
the tank to dilute what is left, and if that doesn't work, clean the
throttle body and IAC valve.
On Fri, 09 Jul 2010 10:58:27 +0200, Dave U. Random wrote:
Techron is a regular additive in Chevron branded gasoline.
I've added it to my '85 Corolla, my '88 Supra and my '89 Mazda with no
The question I would ask is, did you add the right amount for the amount
of gas in the tank? There are two size bottles, 1 for up to 12 gallons and
one for up to 22 gallons. In this case, more is not better since I added
the 22 gal additive and then put in 10 gallons, and had a similar problem
Add some 93 octane gas and you should be OK.
I used the one for 12-gallons, and filled up the gas tank with gas
The local auto parts store had a buy-one-get-one-free deal on it.
I still have 1 unused bottle, which I probably will not use in my other car.
On Sun, 11 Jul 2010 17:21:54 +0200, Dave U. Random wrote:
Interesting. I had (have) an '85 Corolla GTS that at about 130,000 miles
started knocking when there was a load on the engine. I have always used
'quality' gas, brand name stuff, and it was suggested I use Techron. I
zapped it with a bottle for 12 gals, filled with good gas, and then
started using Chevron until they left New England. One bottle every 40-50
tankfulls and the car never knocked again!
I have never had problems with it either, no matter what concentration I
I personally think this is BS.
IIRC, Techron is not the type of chemical that would attack injectors,
Be sure you dont have wet fuel...I mean REALLY wet fuel.
That still happens at times.
You may well have some injectors that are not working properly.
Indeed. When I was growing up I worked at gas stations at one point. One of
the last things you did was coat the last 6" of the "dipstick" for the
tanks and see if it found water. A few months back I saked the guy at the
local self serve about it and he had no idea what I was talking about.
Go ahead and dump it in the other car. I have used injector cleaner at
recomended up to doubble rate and have never had a single adverse problem.
It has helped many a idle and milage problem though.
If a problem is there I recomend the single cleaner dose bottles and
then once a month with the cheap crap there after. It is a good
preventive program. KB
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