I get this question a lot, "should I use a fuel injector cleaner additive?" There are some good cleaner additives but if you are using Top Tier Gas it isn't necessary. Top Tear Gas has good cleaner in it' pump fuel. Here is a link to the web site for more information: http://www.toptiergas.com/ There is a list of gas stations at the web site that carry the fuel.
There are a few conditions that will prevent your injector from accepting a good service. If they fail the electrical test, that is an indication that the windings have failed. Core leaks are also a party killer. Some injectors have a pattern of electrical problems and case leaks but any injector can take a mortal blow from internal corrosion. Cars that have sat for any length of time may have injector corrosion damage. We always check for this when the injectors arrive. Keep in mind we only charge for injectors we can service successfully so you have nothing to loose but some shipping charges. Here is an example of corrosion damage.
If you have an older fuel injected project car you may be finding it hard to get hose feed injectors that are a match for your engines performance. A solution to this problem is to convert a Bosch o-ring feed injector to hose feed. This will widen the selection of available injectors. We can convert o-ring injectors to hose feed for $28.00 each. The conversion includes a complete ASNU Ultrasonic cleaning service, seals, gromets, injector filters and up to 2 inches of hose for each injector. Here are some pictures of some we have done.
Winter is just around the corner for those of us in the northern part of the USA and it's time to put away the summer cars, motorcycles, boats and water craft.
Pump gas doesn't seem to last long in storage these days and it's a good idea to use a stabilizer. I recommend STA-BIL but there are some others out there to that I have not had any experience with.
Fill up the tank and add the stabilizer. Run the engine long enough to get the mixed fuel into the injectors. It's a good idea to start the engine once a month and warm it up to operating temperature.
If you have an injector that is stuck after winter storage send them in for service. We have had good luck in getting them functioning again.
Here is an example of a side feed injector with a plugged filter. We clean these in the ultrasonic bath. The coverage for replacement side feed filters is spotty. We only replace the filters if they are damaged and available.
Here is what they look like after a good ultrasonic cleaning. To have your injectors serviced go to www.mrinjector.us
Here is an example of solid deposit build up on a set of Toyota Denso fuel injectors. The crud you see on the injector on the left was causing 23% flow reduction a misfire and misfire code. On car cleaning which in many cases will resolve a drivability issue didn't touch this stuff. We gave the injectors a good deep ultrasonic cleaning and the flow was restored.
There are some auto parts companies out there that offer rebuilt fuel injectors but our experience testing them has shown very poor balance from one unit to another. If you have a core that fails the electrical test we recommend you buy a new unit. Ask your parts store for new rather than rebuilt. Most of the new ones we test provide good flow balance. We don't offer rebuilt fuel injectors even though most people consider what we do to be a fuel injector rebuild. Our process is one of cleaning your good cores and installing new service parts to bring the injector back into like new performance. To have your injectors serviced go here
Sometimes it's better to just leave well enough alone. The trick is to know what matters and what don't. It's what ya' don't know that gets us all into trouble that's fer' sure. Medical doctors call this "do no harm" although their record for following this advise is no better than the professional tech or DYI'er.
The case in point is the early Jeep Deka Seimans fuel injector. They have a nasty habit of leaking if you look at them wrong. Well, maybe it takes a little more than a nasty look to start one leaking but it doesn't take much more than that.
If you happen to pull a set of these from the early fuel injected Jeeps with the 4.0L engine they may leak when you put them back in. I'm not sure what years they are but any of the ones with the metal lower body and plastic upper can do this. The later all plastic ones don't have the issue. See the ones in the video. If you have a set of these and the vehicle is running OK then "do no harm" and leave well enough alone. If you must pull them then be prepared to the possibility that you may need to replace them. Watch the video. At the end there are some recommendations for replacement.