Hesitation at middle RPM under moderate load
in [Technical]
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From: JoeSpareBedroom on 24 Jul 2010 12:39 "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote in message news:i2ere9$caf$1(a)news.eternal-september.org... > > "Clive" <clive(a)yewbank.demon.co.uk> wrote in message > news:XkaPZWE1osSMFwaA(a)yewbank.demon.co.uk... >> In message <i2drad$pc7$1(a)news.eternal-september.org>, Ray O >> <rokigawa(a)NOSPAMtristarassociates.com> writes >>>"Scott Dorsey" <kludge(a)panix.com> wrote in message >>>news:i2c42f$2ga$1(a)panix2.panix.com... >>>> Ray O <rokigawa(a)NOSPAMtristarassociates.com> wrote: >>>>>I second the carbon buildup on the valves. Hook up a vacuum gauge, and >>>>>when >>>>>the problem is occurring, see if vacuum drops. If the Techron doesn't >>>>>work, >>>>>find a shop with Motor-Vac or that has a way to do the walnut shell >>>>>blast. >>>> The original poster mentioned using high-test gasoline in it just >>>> because >>>> it was cheap right now. >>>> If you run enough high-test in an engine designed with fairly low >>>> compression, >>>> you're apt to wind up with carbon deposits as a result. >>>> --scott >>>Good point. Use what the owner's manual says to use. >> Over here, we only get one Petrol and that's about 95 RON. De-coking, >> or you might call it decarbonising is now very rare with today's modern >> fuels, 50 years ago a de-coke might have been performed ever 20k or so >> but with the detergents now in fuel a good blast down the motorway >> normally cleans out any muck that might have accumulated during light >> start stop, idling type of driving. >> -- >> Clive >> > > I have not run across valves with deposits in a long time - I suppose > that the fuel additives actually work! > -- > > Ray O > (correct punctuation to reply) I wish there was an additive to make a catalytic converter stop burning money. My check engine light came on 6 weeks ago, due to error code P0420. Inspection doesn't come around until November, and there are no other symptoms, not even a change in mpg, so I'm putting off the repair until I feel delighted to spend the money. Ha. Meanwhile, as a tease, the light went off for a week, then on again. 83k miles, 3k out of warranty, and Toyota (both the dealer and their "help" line) says "oh well have a nice day".
From: nm5k on 24 Jul 2010 12:49 On Jul 24, 11:07 am, klu...(a)panix.com (Scott Dorsey) wrote: > > >And another bottle of Techron. > > I don't know how much good that stuff really does, but it won't hurt. > --scott > It works pretty well. Better than a lot of the other brands of stuff they sell as fuel treatments, etc.. One thing about Techron though.. It works best when the engine is shut off when hot and can sit and heat soak for a while. It does little when you are actually driving. It's when you cut off the engine and can let it sit that it melts the cheese. So the best way to clean out carbon with Techron is to do lots of run cycles over and over. IE: Run the engine until it's hot, cut it off and let it sit for an hour, and then repeat, over and over. That works a lot better than dumping a bottle in and burning it up on the highway in one shot. I believe Toyota actually recommends Techron for such a case vs other brands. I know when I had to clean out that Camry, I was shooting it directly into the intake, and could tell that Techron was working better than one of the lesser brands I was trying. I was using one of the cheaper brands at first trying to save some $$$.. But I found out that the extra for Techron is generally worth it. It does work better. It took me almost a week to get it all cleaned out of that Camry doing it the slow manual way.. It was really bad. But things sped up a good bit when I switched to Techron. If I were in a hurry, I'd go find a shop with a motovac machine. I'll usually dump a bottle of Techron in my car tank about once a year or so just to melt any cheese that builds up. The gas I buy has it, but you never know for sure if it's really enough... I'm sure the strength varies being as it's a packet added to gas at the terminals.
From: nm5k on 24 Jul 2010 13:12 On Jul 24, 8:56 am, "Ray O" <rokig...(a)NOSPAMtristarassociates.com> wrote: > > Clive > > I have not run across valves with deposits in a long time - I suppose that > the fuel additives actually work! > -- > > Ray O That's why I stick to top tier gas these days.. Supposedly, all gas sold is supposed to have a minimum amount of detergents. But I'm sure they vary, and the chemicals will vary. IE: Only Chevron and Texaco use Techron. Shell uses their own proprietary stuff along with hyping oxygen as a cleaner. Ditto for Exxon.. They use their own stuff. But if you buy gas at 7-11's etc, all bets are off as to what they use. Will depend on what brand they claim to be.. Some are basically "no-name"... So the last few years I use only the top tier gas to try to avoid the problem. For my Corolla, only Shell, Exxon, Chevron, or Texaco.. I don't use anything else in that car. Of those four, I probably use Exxon the least. But it seems OK. I use it on trips a good bit as that's the brand the particular stations I go to have. I probably use Chevron and Shell the most, but it depends what is handy.
From: Clive on 24 Jul 2010 13:29 In message <7ee3c9d2-e7b7-4188-83a0-6b153d72648e(a)t2g2000yqe.googlegroups.com>, nm5k(a)wt.net writes >It works pretty well. Better than a lot of the other brands of >stuff they sell as fuel treatments, etc.. >One thing about Techron though.. It works best when the >engine is shut off when hot and can sit and heat soak for a >while. It does little when you are actually driving. >It's when you cut off the engine and can let it sit that it melts >the cheese. So the best way to clean out carbon with Techron >is to do lots of run cycles over and over. >IE: Run the engine until it's hot, cut it off and let it sit for >an hour, and then repeat, over and over. >That works a lot better than dumping a bottle in and >burning it up on the highway in one shot. Many moons ago, when cars had carburettors, it was not uncommon to take off the air filter, rev the engine and pour Red-Ex straight down the throat and watching until the black smoke goes white, then the internals were clean. Modern fuels seem to have done away with the practise. -- Clive
From: Clive on 24 Jul 2010 13:32
In message <4c4b0938$0$74748$afc38c87(a)read01.usenet4all.se>, =?iso-2022-jp?q?Hachiroku_=1B$B%O%A%m%=2F=1B=28B?= <Trueno(a)e86.GTS> writes >I used to have one of these back in the 70's > >http://hem.passagen.se/bubben0205/bilder/1800es.jpg > >A "good blast down the motorway" was required about every 7-10 days. >Going up through the gears, by the time you hit 4th at ~65MPH all of a >sudden the car would start to stumble, and then WHAM! Off to the races. That looks like an old Volvo 1800, is it? -- Clive |