Re: injector service off car. worth it ?

Jun 19, 2008 27 Replies
H

Hmmmm...why do I get the impression I'm being toyed with here? ;)

One thing I do know: Particularly on my long-term cars (1980 Corolla SR5 and the GTS) it was easy to watch trends with my little notebook. The SR5 got 33 MPG in the end, and the GTS averages about 36. The 80 had a 1.8 Carbed engine and the GTS a 1.6 TC injected engine.

I still don't really have the tC dialed in yet. I don't drive it enough.

But, I drove the car in Vermont the first year I drove it, and I did notice an increase switching from Shell to the Ethanol fuel sold in Mass. About 2 MPG consistently.

However, I also had my Grand Voyager and the LHS at this time. The Gr Vger had a pushrod 3.3 liter and the LHS had an OHC 3.5 liter: the LHS also suffered (~2 MPG) on Vt gas, while the Vger was unaffected (27 MPG overall).

BTW, I use Shell and Gulf. Gulf is the 'lowest' brand I will put in my car, but it seems to work well. Now, ~15-20 years ago I was using Mobil in the GTS, and it developed pre-ignition. I ran two tanks of Techron and switched to Chevron and Amoco (when we still had them here) and the problem stopped.

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S

I'm not ignoring it, I'm just pointing it out as a potential source of skew- which it is in some cases. And I said it isn't large.

No thanks. I don't do Toyota.

Yep, my bad. Speed-density systems do have a limp mode in case the MAP sensor fails, in which case the whole system is run on nothing but the TPS and a look-up table and that's what I was thinking of- although that's an aberrent case and not really relevant to the discussion. Gotta say, though, it works surprisingly well in that the engine will run and get you home. I assume decent MAF-driven systems have a similar fail-safe mode.

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B

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Now that I can believe :-)

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H

Dude, like I said, I keep a little black book in every car, with oil changes, repairs, maintenance, and fill ups.

If I change something I can see the effects, if any of the change.

For some reason, it doesn't work with the Supra...

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R

Open loop is usually VERY short. On my car it's about 20 seconds. (80F)

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B

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AutoZone is a great store. They even have a *free* loan-a-tool program of seldom-used, expensive tools, like a CV clamp tool, serpentine belt tool, etc., etc.

They require a deposit, but refund it when you return the tool.

Here's just some of the great tools they loan out for free:

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A list of more tool categories is in the right margin of that page.

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R

Why borrow a tool when you can buy it and own it and justify the need for a larger tool box as you accumulate even more tools?

Seriously, a tool loaner program is a great idea to get people to come to the store to buy parts.

I will buy a cheap tool from someplace like Harbor Freight if I think that I'll only use it once or twice. If I'm going to use it regularly, I'll get better quality like Snap-On or Craftsman.

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D

Gosh Tegger, you need to try

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services and allow me to prove your cynicism misplaced! We have a TUNER service that directly measu res combustion dynamic of any IC engine. As far as identifying chemical con stituents in fuel and oil we absolutely can. I ran the R&D chemistry lab at Cummins engine company. In addition to engine development and testing we c orrelated oil and fuels analysis of just about any IC engine imaginable. I also formulated lubricants and tested filters for fuel , oil and air. After 37+ years we do exactly what you say we can?t! At YOUR service with science, Terry

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