Chevron Techron
 

Two different E.P.A certification engineers told me to put nothing but Chevron supreme fuel in the new cars we built at Shelby American & Saleen Mustang. 1999 Shelby Series 1 & 1994 Saleen SR351. I have never had a fuel problem since then & no need to use additives.

Unfortunately, that is not an option here. I do stick with Tier 1 fuels though, Shell or Sinclair. The Sinclair is at least ethanol-free!

Same here, no Chevron or Texaco gas stations near me. I do the same thing as you, I get ethanol-free gas from Quick Trip.

If the injectors were performing so poorly that the engine fell flat at 5200 rpm, then they are still performing poorly. The techron might have unplugged them a bit but you can be sure that they still drip, have poor spray patterns, and are out of calibration.

The fix in a bottle might help the situation but it doesn't fix the problem. I'd really recommend pulling the injectors and having them cleaned and calibrated. You'll be truly shocked at how much better an engine runs after having this done.

And if you haven't replaced the fuel filter in awhile, I'd do that too. You'd be amazed at how dirty even good gas is these days: http://986forum.com/forums/boxster-general-discussions/70474-dont-forget-replace-fuel-filter.html

Here is the report on my fuel injectors that I recently had cleaned/calibrated. The engine ran fine but seemed just a little low on power.

http://986forum.com/forums/uploads02...1555780518.jpg

Tom, what do they charge to do the cleaning and calibration?

between $10 and $25 per injector depending on level of service and where you go

+ 1 on RC

Yes, the difference is amazing (very smooth running engine), also RC Engineering has great service as their turn around time is usually 24 hrs, last time I paid about $25 per injector.
.

Yes I have taken 3 sets there, amazed at how smooth the idle is after cleaning

Hum, have a company that sells remanufactured OE Bosch injectors with a 276cc flow rate and $56.58 shipped for all 6 injectors.

That seems too good to be true.

https://i.postimg.cc/XqDfvmM0/injectors.jpg

https://www.ebay.com/itm/254017616708

Hmm. They seem curiously inexpensive.

The posting says, "Re-manufactured.We remove all part number message of eBay policy.".

All OE injectors have PNs on them. I'm guessing that they don't have any part numbers because they are knock-offs (eBay won't allow real PNs on non-OE parts).

Here is what my OE injectors looked like with the PN's clearly visible:

http://986forum.com/forums/uploads02...1514571330.jpg

So what would be the downside of buying these?

Having to replace second-rate parts for OEM.

Buy cheap, buy twice.

How do we know these injectors are second rate parts?

We don’t know, but they are so inexpensive as to be suspicious.

Why don’t you buy a set and give them a try?

I don't have an issue with my injectors, car idles and runs fine. If I did buy them and said my car ran better, you all would accuse me of having a placebo effect.

How about you buy them and let us know, since all my experiences are placebo?

I did indeed change the fuel filter, and spark plugs as well.
Now since it only has 56k on it, do you really think the injectors need rebuilding?

If you used Techron ,changed fuel filter,and plugs all at the same time there is no way of telling which of the three (or combination of) fixed the problem.:confused:
Now a reason your injectors "MAY" need cleaned: Is the low miles and a 99.
It has sat for long periods of time so your injectors "MAY" be a little gummed up from setting.:rolleyes:
But it could have been a Dirty fuel filter and your injectors are fine:D

Has anyone used Driven Injector Defender? I believe that Jake Raby and LN are recommending it. How often are you using it?

Yes. Why?

1. The engine was falling on its face at 5200 rpm.
2. With only 56K miles, the car has sat for extended periods of time.
3. The car is 20 years old.

But if it runs and you're happy with it, then don't worry about the injectors. Just a suggestion to get it running as well as possible.

I haven’t considered my injectors. Car pulls good and has 100k and 19 years on it . Makes sense that this could be an issue but I’m curious what the audience has to say. Should I run a gas tank cleaner through the system or pull em. I have a big maintenance coming that includes plugs, tubes and coils, mostly because I bought them, no issues.

Thoughts?

Weigh in!!!!


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On the one hand I believe in the "if it ain't broke don't fix it" way of thinking.
On the other hand It would be interesting to know the condition of the injectors from a good running engine after a 100k miles. And the felt difference if any after sending out for cleaning.

I am of the same mindset. I don't go looking for things to fix.

See my post above with the injector test results. Chevron Techron Post #5

Those injectors were from a 92K engine that ran fine. My only clue that something wasn't perfect was the dyno test that showed it was a few ponies short of what I was expecting and that is my I had the injectors tested/cleaned.

I can't feel any power difference, but I wouldn't expect to feel it since it might be just a hand full of HP's. I haven't had the opportunity to get another dyno test done (yet).

But I can say that the engine idles silky smooth and feels like a precision watch. It didn't feel like that before the injector cleaning.

YMMV.

yes I read your post #5 with great interest. They did some nice testing on those injectors.
Makes me want to pull mine and send them out.
I only have 52k on my 2000S bought it with 47k last July.
But it runs so nice I am hesitant to touch it:D

How hard is it to pull the injectors?

I have never pulled them on a Porsche Boxster.
But reading the Bentley manual description of removal it doesn't look difficult.
They do come out as a unit (fuel rail and injectors as one).

For the 993 series, it is recommended by the mechanics I trust to use chevron supreme or Chevron fuel system cleaner every 5th tank to keep the valves from coking, which is a known problem for those cars. Haven’t heard that for m96 motors but still do that out of habit for all my cars.

It’s not difficult or technical. I did this as a first project with my 98. Followed Dempsey’s instructions by the book. Pretty rewarding because you really have to get up into it. There were a few scraped knuckles before I was done.