JAGUAR FUEL INJECTOR SERVICE.COM
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CIS gas petrol injector cleaning, testing, and service.
K-Jetronic gas petrol injector cleaning, testing, service.
Mechanical injector cleaning, testing, and service.
Mercedes CIS injectors, Porsche CIS injectors, Volvo CIS injectors, Audi CIS injectors, VW CIS injectors.
CIS is an acronym for continuous injection system. It is also commonly referred to as the Bosch K Jetronic injection system. Also referred to as mechanical injectors. The principle operation of the CIS system is as follows. CIS injectors are mechanical injectors. They are not operated by an electrical voltage on an internal injector coil, as is found on an MPI injection system. Rather, a CIS system and injector, operates via variable fuel pressure as delivered via the engines' fuel distribution head. When a CIS vehicle ignition switch is turned to the "start" position, the fuel pump is energized, fuel pressure increases in the fuel distribution head, and the injectors are opened via the increased fuel pressure...(by way of internal injector spring tension)...and injector fuel delivery volume is then controlled by the fuel pressure that varies (based upon engine demand) within the fuel distribution head.
The CIS injection system was commonly used on Mercedes, Volvos, VW's, Audi's, Porsche, and other vehicles from 1973 thru 1995. As the CIS injection system is no longer used on the newer vehicles, it is increasingly more difficult to obtain servicing on the system, locating replacement parts, locating replacement injectors, and locating testing and servicing sources for CIS injectors.
As such, we find it responsible to provide a location for testing and servicing of your CIS injectors. It not only eliminates the cost of acquiring new CIS injectors at retail cost...but it also allows your injectors to be ultrasonically cleaned and serviced, and tested for balanced fuel delivery flow, such that your vehicle performs at its' maximum potential. Testing and ultrasonic cleaning of CIS injectors is about 60% to 75% less than purchasing new replacement CIS injectors.
We can service CIS injectors, and in most cases, restore flow rates to OEM specs. We have the ability to service the following CIS injectors...
1) CIS injectors with a 12 mm OD male thread.
2) CIS injectors with a 10 mm OD male thread.
3) CIS injectors with a 8 mm ID male thread. (which should include cold start injectors).
4) CIS injectors with a 8 mm ID female thread.
CIS injectors must be tested individually. They cannot be tested as a group, as in the MPI (multi port injection) series injectors. The reason is...the "crack" or open pressure of the injector pintle, may vary per injector. If one injector opens prior to others in the set, then the "crack open" pressure of the remaining injectors is "skewed" by the first injector that opens, and fuel flow rates will not be accurately tested.
With the above in mind, it continues to be critical that all CIS injectors open within a correct "fuel pressure window", and equally important...that once opened...they provide a flow rate within a 10% cc flow deviation.
There are two separate ultrasonic cleaning processes that must be conducted, on CIS injectors. The first ultrasonic cleaning process, cleans the tip end of the injectors collectively. The tip end (which is the orifice [pintle] opening end of the injector), is submerged in the ultrasonic cleaner, such that only the discharge tip of the injectors is cleaned, (removing burned on fuel olafins from the injector tip). Upon completion of this step, the second ultrasonic cleaning process lays the injectors horizontally within the ultrasonic cleaner (such that the injectors are completely submerged within the cleaning tank), to remove internal "sludge" from within the injectors, and to remove external "sludge" buildup on each injector.
By using this particular, step by step, cleaning process, all "foreign matter" can be removed, both internally, and externally, from the injector.
Cost of service is as follows.....
Clean and test 4 CIS injectors.....................$64.00
Clean and test 6 CIS injectors.....................$96.00
Clean and test 8 CIS injectors...................$128.00
In the near future, we will begin to stock o-rings for CIS injectors. However, at this time, we do not. Therefore, the service cost does not include any o-rings, or any other parts. You need to acquire these from your dealer, or auto parts supplier. Likewise, replacing CIS injector filters is not practical. It requires complete disassembly of the injector, which is not economically feasible.
CIS injector testing includes a full written report of pre and post cleaning results.
Return shipping to any continentail USA location is $10.95...via USPS Priority Mail.
NOTE: As with any injector, rust within the injector is extremely difficult (if not impossible) to remove. Most injectors than contain internal rust...require replacement. However, in some instances, the ultrasonic cleaning process will remove light rust. Currently, we do not stock replacement CIS injectors. Likewise, many CIS injectors may fail due to a weak internal spring. We cannot replace the spring. If the spring is weak, the injector requires replacement. A weak spring will cause that particular injector to open early, and overfuel, or leak, and result in an unbalanced fuel flow of the injector group.
Prior to shipping your CIS injectors for service, please be sure to measure the ID or OD of the injector threads, or contact your dealer for specs.
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