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Re: mileage decrease with techron Posted by Saana88 [Email]  (#207)  [Profile/Gallery]
(more from Saana88) on Wed, 14 Mar 2007 14:24:33
In Reply to: mileage decrease with techron, tsw, Wed, 14 Mar 2007 09:54:38 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Usually, when I use full-blast additives like Techron I change the fuel filter immediately after the tank of gas that had the additive in it in case it dredged or dissolved anything in the tank.
Always give it a couple of tanks before drawing conclusions. 900 fuel tanks and fillers are pretty sensitive to the angle of incline the car is on when you fill the tank and how sensitive the (never calibrated, hardly ever working) shut-off trigger in the filler nozzle.
Also be sure you didn't get awful gasoline. Bargain brands source their gas from whichever wholesaler is giving the lower price so you've got a continual mix of additives and formulae coming from there. The other poster is also correct about the changeover to oxygenated fuels. The worst case I found was a station I've never gone back to that was pumping around 83 octane during the Katrina-induced supply disruptions. My car ran terribly.
Finally, if the FI cleaner is doing its job and you have lots of deposits built up in the combustion chambers, it will try to burn it off. Those deposits are the remnants of incomplete combustion. In order to get them out of there, not only should you use fuel with higher detergency (whether you put it in or the refinery does) but you also need to get the combustion temperatures up high enough to complete the combustion cycle. With a warm engine (and all your fluids right, obeying most local laws, et cetera) do a couple of runs from 20-50 miles an hour and higher engine load and speed. This means a bit of full throttle and in excess of 3500 RPM or so. This sudden increase in load heats up the combustion area. If you've ever seen a slushomatic kick all the way down when the driver suddenly floors the accelerator, you'll notice a light burning smell and often a puff of black discharge out the tailpipe. That's what happened there.
Bad deposit buildups actually decrease the effective displacement of your engine and increase the compression ratio.
To complete the cycle, change your plugs and engine oil if they are both needy subjects. Plugs that aren't burning hot enough will also cause this issue.
And of course, since you're dealing with a turbo, idle down when you're done with this test.
, Wed, 14 Mar 2007 14:24:33 <-- Viewing This Message
, Sat, 17 Mar 2007 16:41:18
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