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I may be wrong, so give me some slack here, but could it be possible that the varnish or whatever is building up so slowly that you wouldn't notice the deminished performance?
Not in the case of my Corvette, because I take it drag racing so if I was losing power I'd see my ET and trap speed get worse. I'd also probably notice my average MPG changing too.
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Patman your MPH can vary from humidity and elevation change of the atmosphere. Heck even the MAF and 02 sensors will work withing parameters but not provide accurate information to the computer. ET's can vary from your 60ft's and when the air gets thin it'll dictate your ET's aswell. My 60fts ranged from 1.51 seconds to 1.54.
A good example is 1mth ago in my fairweather daily driven 1965 VW beetle I went to the track. 1st run 11.92sec (not taking 1/8 mile either) then 11.95, 12.01, 12.02. Air was getting thin/horrible and it dicated by my ET's and MPH. Mind you I'm running carbs but regardless its a matter of fuel delivery.
http://members.shaw.ca/acvolkswagen/backinthe11.htm
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Patman your MPH can vary from humidity and elevation change of the atmosphere. Heck even the MAF and 02 sensors will work withing parameters but not provide accurate information to the computer. ET's can vary from your 60ft's and when the air gets thin it'll dictate your ET's aswell. My 60fts ranged from 1.51 seconds to 1.54.
A good example is 1mth ago in my fairweather daily driven 1965 VW beetle I went to the track. 1st run 11.92sec (not taking 1/8 mile either) then 11.95, 12.01, 12.02. Air was getting thin/horrible and it dicated by my ET's and MPH. Mind you I'm running carbs but regardless its a matter of fuel delivery.
http://members.shaw.ca/acvolkswagen/backinthe11.htm
Not to sound like a smartazz, but I do know a thing or two about racing, as I've got over 2000 quarter mile runs under my belt, I've been racing since 1991. And everytime I go racing I calculate the DA, and correct my ET/mph for that, so I know that weather plays a HUGE factor in my ET/mph, as well as the 60ft (my car is very consistent in that department, typically 1.98 to 2.05, depending on the amount of VHT they spray on the track)
My car's best time is 12.81 at 109.4, with a 1.98 60ft.
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I used to work at the plant most GM injectors were made at and had the opportunity to replace the injectors on my '91 Corsica (V6) when it had approx. 110,000 miles on it. I had never used FI cleaner and usually bought cheap gas at a busy gas station on my way home from work. This was back in late 1999 and I took the old injectors to work and we checked them out and they had virtually no build up around the director holes on the tip. None of the build up was in a hole where it would have affected performance. I had bought the car used with 58k miles on it. That convinced me cleaner really isn't needed, normally. I just got rid of a '94 Grand Prix with the 3100V6 and 210k miles on it and only used FI cleaner twice perhaps and it still ran great.
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with 180,000 miles on my car i decided to try a bottle of techron concentrate. actually 2 bottles of it.
it didnt help a thing and my gas mileage is still the same as it ever was.
modern injectors are self cleaning. dirty gas should be cleaned up by the fuel filter. also most injectors have a super fine screen inside them as a last line of defense.