injector service off car. worth it ?

Before you pull injectors, try Chevron Techron fuel injector cleaner, Motor Vac service, or BG fuel injector service. If you pull injectors, the O-rings will also have to be replaced.

Rough idle and pinging could be from a dirty MAF sensor. Unplug and remove the sensor, spray some brake cleaner inside the opening, let the brake cleaner drip out, and air dry.

I would try all that stuff before pulling injectors.

"Ray O" wrote in news:2dudnVqed5UHPMXVnZ2dnUVZ snipped-for-privacy@comcast.com:

I agree. With today's gas having such a high concentration of detergents, injector fouling is rare.

Stop using off brand gas. Run a couple tanks of something good, and run two tanks of Techron, as Ray suggested.

nZ2dnUVZ snipped-for-privacy@comcast.com:

I must say, I was doing a lot of driving -- around 3000 a month. I figured some 'injector' cleaner every other fill-up was a good idea. No. Very bad idea. Be very careful with injector cleaner and don't use it often. I ended up HAVING to have my injectors removed, cleaned, and found one was cracked/leaking and replaced it. Now, I stopped using injector cleaner and just fill up at brand name stations and haven't had any issues since.

Some of the injector cleaners are a bit 'aggressive' and wind up "cleaning" the coating off the injectors MUCH faster than gasoline would.

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Shell V-Power (premium) has a lot of detergents in it, much more than the Top Tier threshold. Shell primo is Tribologist Terry Dyson's favorite gas right now.

He likes it with ethanol in the premium, too. Like lotsa folks, I'm not keen on 10 percent ethanol, though.

I doubt if the best gas in the world will eliminate the condition that the OP is describing, and it is not necessary to use premium fuel in a Corolla.

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Well, you mentioned the OP should try Chevron Techron fuel injector cleaner. I was just noting that the detergent additive in Shell V-Power is preferred by Tribologist Terry Dyson more than the Techron that comes in Chevron gasoline.

Once he gets his injector problem resolved, he can opt for a brand name gasoline like Shell V-Power, (regular grade or premium).

I also mentioned that a dirty MAF sensor is more likely to cure the condition than cleaning the fuel injectors.

No. If your car is working properly and it gets Tier-1 gas you don't need injector service off the car. Maybe a bottle of Techron Fuel Injector Cleaner every 30K miles at the most.

Built_Well wrote in news:1591c985-190e- snipped-for-privacy@x41g2000hsb.googlegroups.com:

I think Terry Dyson is overrated and thinks he knows more than he actually does.

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[Chuckle] Well, I think Mr. Terry Dyson of Dyson Analysis is a renowned tribologist with decades of experience who analyzes UOAs on a daily basis. He can see, for example, the effects of different brands of gasoline on engines that have fuel dilution blow-by problems, piston ring problems, etc.

Finally, people don't pay him $60 per used oil analysis for nothing, especially when you can get a used oil analysis from Blackstone-Labs for ~$23. But North America is about diversity, so you're welcome to your opinion :-) [Lol]

Why don't you elaborate on this, Hachi. Give us some concrete mileage numbers. Interesting :-)

My unsolicited opinion is that used oil analysis is, for the most part, a waste of money.

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I have to disagree here. Huge fleets and sober, bottom line minded trucking companies employ Used Oil Analysis on an ongoing basis to protect their costly engine investments.

You're both right.

IF you do used oil analysis on an ongoing basis and you watch trends, it can give you valuable information about your engine, and it can also allow you to optimize oil change intervals. On a long-haul truck this a big deal and can result in substantial savings.

However, on an automobile that only takes four quarts of oil, it's cheaper just to change the oil every 3,000 miles than to spend the money for regular used oil analyses. Therefore it is a waste of money in this case.

And if you do a single analysis without doing it on a regular basis, you have no way of knowing what the baseline value is or what the trends are, and consequently that's a waste of money too.

--scott

I've had the oil checked, Blackstone, once. I was only interested in finding any antifreeze. Everything else was good too but they told me there was no antifreeze, which is the news I needed. If you have every lost an engine due to antifreeze in the oil you would understand. I then was able to track down the reason for a slow loose of the green stuff. If there had been greenstuff in the oil I would need to return this, brand new, rebuilt engine.

I don't opt for regularly doing this but after 2 years maybe it's time for another check-up. 120K on this engine.

disston

Sorry for the double post but I forgot to mention that the original problem, was it RT, rough idle, running? I also recomend the MAF cleaning, check vacuum lines while at it, and prolly a new airfilter. I now do the MAF cleaning everytime I change the filter. I met a Toyota owner recently who told me he changed the airfilter only every 80K. My impression was he was just cheap and tried to explain the false economy of this. Got him thinking but not sure if he did it.

First things first and then look into this more elaborate stuff. Car talk lists, like this one, are a great source of info for the public. But tell us what you did, or had done, recentlly. We will almost always make you go through some basic stuff before advising the more exspensive stuff. If not you would spend the 80 bucks to clean the injectors, plus labour. And still have the same problem. If you don't know when the last time was the MAF was cleaned, it is time to do it. Oh, and you can do this yourself, maybe.

disston

I dont disagree with that. Commercial fleets have different goals and needs.

If there is a specific reason to do an oil analysis, for an individual, I have no issues with that. But if you are going to change your oil anyway over a period of 3000-7,000 miles, I feel it is money wasted that could have paid for the oil change.