Pictures: Inside of Intake Manifold, Fuel Injector cleaning & testing (1 Viewer)

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2001LC

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I pulled the intake manifold apart to clean and install new gasket & injector seals. I found puddles of "?" in chambers that are seemingly sealed, that is, they don't open to manifold chamber or head ports directly.

I'm guessing these cambers catch/trap any excessive liquid vapor/oil carried by air from entering head through final intake port. The very dark port just to the outside of these cambers go directly into the heads intake valves cambers, fuel injectors are at the bottom of these intake manifold ports.

Just before pulling intake, I fogged with a full can od SeaFoam, spraying through DS PCV inlet of intake manifold. I then drove two ~5 miles trips, varying gears (D, 2 & 1) to get high RPM's on city street, too blow out.

What is the liquid? How did it get in there? How's it going to get out?

Puddles in cambers
01 LX470 day 11 intake manifold 028.JPG


Top half of intake manifold. Front: PCV inlets ports & small capped inlet tube port. Rear: Vacuum port to power steering pump sending unit.

01 LX470 day 11 intake manifold 018.JPG


Fuel injectors tips penetrating bottoms of intake manifold port outlets.

Z 01 LX470 day 8 Starter 006.JPG


Old gasket.
01 LX470 day 11 intake manifold 023.JPG

New gasket
Z 01 LX470 day Starter, wire splice & intake installed 3-22-16 002.JPG
 
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Fuel injector; Results from Cleaning, rebuilding & testing with pictures. Here is what Chuck from FIS Fuel Injector Specialists - Home - Wheat Ridge, CO had to say: (Mention your from MUB and you may get a discount)

Refer to the 4 attached pictures, all of which are "after" rebuild.

Low pressure picture (the fuel streams are more distinct) shows problems with injector #2 -- the left stream of this injector is weak, not nearly the flow of the right stream. As it is, the TOTAL flow volume of this injector is only down a bit (refer to the 15 seconds static volume picture). Here is where we differ from ANY injector service currently in business-- ALL OF OUR COMPETITION, including the big boys like GB in San Diego and Autolite in Canada, WILL PASS OR FAIL AN INJECTOR SOLELY BASED ON VOLUME. Pattern is not an issue, because their minimum wage help is not trained to recognize pattern differences and issues.

We are convinced that the absolute key to smooth running and high gas mileage, and a great warm idle, is PATTERN. Your number two injector has an unbalanced fuel stream.

Your #3 injector ALSO has an unbalanced fuel stream, only in this case the LH fuel stream is "sharp", and never atomizes properly, as shown in the "high Pressure" pattern picture (high pressure = fuzzier fuel streams). Again, this is why we do "high and low", hot and cold testing.

We recommend replacing #2 and #3. All have been hand etched with the appropriate numbers.

The resistance values on all are within spec, and there is no bleed down hot or cold.

6 injectors rebuilt, new seals etc, etc. Your cost is $75. Bad injectors are marked. Injectors will be at INTERMOUNTAIN Saturday A.M.

Thanks.

Chuck

Also, we are the ONLY company which will show you a 25/75 duty cycle pic. We do a lot of work for "Adventure Offroad" in Boulder; they are high end Landcruiser specialists ($75k restorations, etc.) The last set of injectors from them tested perfectly on static (injector held open) volume. But, 25/75 duty pic showed a 30% difference!! Injector was poorly manufactured NEW, excessive needle lift, and the unaware owner(s) has had injector issues forever.

IMG_20160318_115639415_HDR.jpg
IMG_20160318_120229274_HDR.jpg
IMG_20160318_121128040_HDR.jpg
IMG_20160318_121136392_HDR.jpg
 
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Very enlightening, thanks for posting this. What was the turn around time for having them rebuilt? Do you know if they actually take them apart and work on the internal parts or just clean them externally by shooting solvent through them?
Have you priced new replacement injectors yet?
 
Turn around time was 24hr, that time.

They rebuild them with new filters & seals, then test. Saved me the cost of new seals from the Dealer.

Old seals & filters:
01 LX470 044.JPG


New Fuel Injector from Toyota Dealer, list at around $180.00 IIRC.
 
I'm assuming the spray pattern and low volume is due to clogged tips. Is ultrasonic cleaning a thing for injectors? Or once the tips get clogged they are toast?

Im asking since I have 9 injectors that I will eventually send out to get cleaned/tested before or if I ever get around to reinstalling the trd blower.
 
No tips are not clogged. The fuel injectors were 100% clean, rebuilt with new filters installed prior to testing. The spray pattern has to do with injector was poorly manufactured NEW, excessive needle lift or some other issue.

Chuck at FIS is an artist with fuel injector & throttle bodies. The two bad injector would have passed most any injector cleaning services inspection. FIS not only found these two "bad" injectors, but did not charge me for them. FIS doesn't charge for any bad injector they find.

Chuck at FIS has been very responsive to emails and on the phone (answers every time).
Here is an answer to just one of the questions I asked:
"We also coat the inside of injectors with a fine film of top quality GUN OIL -- after our cleaning, the injectors are so clean they will grab water molecules from the air and start the rusting process, as a gun barrel will do. But times a factor o about 10. Using zip lock bags is fairly effective. Even so. we recommend that people don't rebuild injectors a MAXIMUM of 30 days until use."
 
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This was on my new to me LX, so I have no prior data on MPG. For this reason I've not replaced yet.

With my LC I do have very accurate MPG data going back ~12 years. I plan on having the LC done next. It's MPG has dropped over the years. If it shows bad or weak Fuel injector, I'll swap them out. This will be a very good test. Just got to get cough up on projects first.
 
@2001LC Do you have any guides for actually removing the fuel injectors?

I was watching a YouTube video and the suggested to clear the fuel lines by remove the fuel pump fuse, turning on ignition, then off. Then putting fuse back in. Is this relevant to 2004 LX? How much fuel leaks when you remove the fuel injectors?
 

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