When to Clean or Replace fuel injectors

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I just ran across this list of fuel tank additives, rating each one. Out of ten, 44K came in number one.


Interesting, while driving through CA & NV I stopped in NAPA & Advance Auto which both carry 44K in CO. They never even heard of BG products much less 44K.
 
@2001LC pAul what does a new toyota injector in the box look like? Does it have a top and bottom bushing plus top and bottom rings?
like the pic indicates.

Untitled.webp
 
No, it only comes with the O-ring (23250B in your diagram) at the top. The VVT plastic manifold has a different PN # for Fuel Injector 2320950080 than earlier models, and does not use grommet (23250C in your diagram) at top. The insulator (23291 in your diagram) at bottom which fits into the manifold is sold separately.
Fuel injector Denso 06-07.webp
 
I was trying to figure out, yesterday I installed injectors with only one o ring at the top. And I saw the top grommet was omitted after 05/2005. Trying to see if I messed up. I sent 8 originals out to your friend.
 
jerryb said:
I was trying to figure out, yesterday I installed injectors with only one o ring at the top. And I saw the top grommet was omitted after 05/2005. Trying to see if I messed up. I sent 8 originals out to your friend.
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I assume you mean Chuck at FIS (I've never meet in person). He'll ship back with O-ring at top. You'll need to buy 8 Insulators for the bottom. Keep in mind: He recommends installing and running engine within 30 day, or needles will rust.
 
Read through the thread, and I've a couple questions. I'm about to go through the spark plugs (replace with OEM at 175k) in the coming week(s), and I'm wondering if I should put some additive in before I change them, or after, and is it okay to use more than one additive (say, TECHRON and like a SeaFoam) at the same time/would it even have any positive affect of doing such?

I'd have to do some controlled testing to figure out if I'm actually having "issues" (not that I can tell from daily driving, idle seems fine, maybe a bit low at a stop, no CEL, etc.) with my injectors, but after twenty years and not knowing if they've been touched (I know they last a bit unless one fails), should I just look into maybe sending them out to FIS or similar to have them serviced? I'm on the east coast, so my truck would be down for a bit as they get sent, serviced, sent back, so at that point is it worth it?

My questions may be extremely broad and I may be looking for problems I may not have, but I'm trying to still get this truck up to a point I feel comfortable with and I'd like to cover all my bases.
 
Paul, do you install injectors with one oring at the top on 05/2005+ LC? pics of the 50080 OR F020 05/2005 + injectors show two orings on top. I installed some with one oring at the top. I went so fast I don't remember if the stock ones coming out had two on the top or just one.
 
@mrahc if you want to do Seafoam or something, then it's best to change the spark plugs right afterwards as they can get fouled and it's best to change the oil too. But I have never heard of any reason to do an additive because are you changing spark plugs.

Injector cleaner is good stuff but just make sure you get a quality brand. Seafoam injector cleaner is what I use.

FIS is a great company I've had injectors serviced there and they give more info and photos than any other service I've seen. I like that they are local too. However, instead of cleaning my factory injectors, I just went ahead and got a set of balanced and rebuilt injectors from a newer Toyota that are 12-hole design. According to some links on this forum the 06-07 VVTI trucks supposedly have 12-hole injectors, but mine did not. You can read about my experience in this thread here.

I picked up a set of 8 rebuilt and balanced injectors for about $100, which is far less than you could have your stock injectors serviced for and on top of that your truck will only be down for an hour. Triple win in my book.
 
mrahc said:
Read through the thread, and I've a couple questions. I'm about to go through the spark plugs (replace with OEM at 175k) in the coming week(s), and I'm wondering if I should put some additive in before I change them, or after, and is it okay to use more than one additive (say, TECHRON and like a SeaFoam) at the same time/would it even have any positive affect of doing such?

I'd have to do some controlled testing to figure out if I'm actually having "issues" (not that I can tell from daily driving, idle seems fine, maybe a bit low at a stop, no CEL, etc.) with my injectors, but after twenty years and not knowing if they've been touched (I know they last a bit unless one fails), should I just look into maybe sending them out to FIS or similar to have them serviced? I'm on the east coast, so my truck would be down for a bit as they get sent, serviced, sent back, so at that point is it worth it?

My questions may be extremely broad and I may be looking for problems I may not have, but I'm trying to still get this truck up to a point I feel comfortable with and I'd like to cover all my bases.
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You can add different additives to the gas, but I do one at a time (per one tank of gas). Mixing two or three in one tank, may give a bad reaction IDK.

I use 44k most often but sometimes the other you mentioned. A shop mechanic at Toyota for 20 years just told me: "When we have plugs that are stuck, we advise client to drive for two tank full of gas adding one can of 44K in each. Then bring back for plugs replacement, as they come out easier then."

I've got a 350K mile 00LX I may experiment with. I've already replaced all vacuum lines and gasket of intake manifold (i.e: manifold & Throttle body gaskets along with injector bottom seal (isolator). Done the T-body cleaning and replaced air filter. It's still sluggish off the line or passing. I'm going to do one of three items (Spark plugs, injector and coils (coil boots are good)) at a time going forward, to see how each respond.

Can of 44k, Techron, Seafoam all can be beneficial in cleaning injector even better is onboard BG cleaning system the Dealers do, then follow with additive. But best and only way to know if injector is less than optimum is have service off vehicle at place like FIS in Denver. You can find others around the world due injector service. But FIS does hot an cold, rejecting more than anyone else known to in the world. If using FIS service mention you saw him in mud, he may or may not still give discount IDK.

jerryb said:
Paul, do you install injectors with one oring at the top on 05/2005+ LC? pics of the 50080 OR F020 05/2005 + injectors show two orings on top. I installed some with one oring at the top. I went so fast I don't remember if the stock ones coming out had two on the top or just one.
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Click on PN # in post # 23. Then go to main page and input your VIN #. It will take you to parts for your rig, will even tell you the color and mfg date. In it you not see the grommet at top only one O-ring, those grommets are only on pre 05.2005 (the non VVT) This assume you're talking about your 06 w/VVT w/black plastic intake manifold.
 
I ones I bought were new. They were made by US Standard IIRC which I purchased from Fuel Injector Specialists - Home - Wheat Ridge, CO They cleaned and tested them for me also. Seems they need it even new. They Have Denso molded on them. Apparently Denso no longer makes, although Denso manufactured are still available at more than twice the cost.

Typically I just have my old injectors rebuilt by Fuel Injector Specialists - Home - Wheat Ridge, CO. It was just once we had so many with excessive leak down, we replaced the set.
 
2004 with 125k

Installed fresh (matched) 12 hole fuel injectors AND 8 new denso ignition coils. Also new spark plugs, fuel pressure regulator, fuel filter, pcv valve, cleaned maf, TB cleaning, new hoses.

the old fuel injector rubber gaskets were pretty worn down.

13.9 miles/gallon before
14.1 after.

everything feels the same.

still have a very slight booming during braked “D”. Nose seems to come from the rear end. Might try replacing the exhaust gaskets.
 
Just sent my fuel injectors off to be cleaned/tested at FIS. Had everything else apart, and will be apart for another couple weeks, so figured why not. I'll report back with pictures and stuff.

Similar to @boobird i'm cleaning fuel injectors and replacing all rubber, TT plugs, FPR, pulse dampener, fuel filter, PCV, cleaning MAF/TB, new hoses, valve cover gaskets/tube seals. Haven't pulled coils yet, but likely just replacing rubber parts with that DENSO kit.

85-90% highway driving already yields me around 14 MPG, so i don't expect this to improve much, or pay back anytime soon, but will nice to not have to address any of that for a long time.
 
ikellymo said:
Is FIS still in business and serving clients well? Website is down, and I'm looking to get my injectors cleaned.
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I'll be curious to know what you find. They have a Yelp review from one year ago, so any closure would be recent. Also, they have a phone number available on Google, so calling might be the best bet.
 
Fuel Injector Specialist (FIS), is still in business! Only the web page is down (temporally).

FIS web page is temporarily down, but business is alive. I spoke with Chuck, owner of FIS, today. He's redesigning web page. Additionally, the company that host his web page, is having sever issues. All will be corrected in time.

In the meantime:
You can call Chuck, or just ship your injectors to FIS. They'll get your injectors serviced and shipped back to you, ready to install.

Fuel Injector Specialist
4996 Parfet St.
Wheat Ridge CO 80033

Chuck 303-433-0462
 
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I did, about 6 months ago.
You can call to confirm.
 
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