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CIS fuel injector test 200 1981

posted by  old244 on  Fri Apr 11 09:24 CST 2003
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last visit: Thu Jan 17 02:44 CST 2008
[RELATED]

While I have the brick semi-torn apart, I was thinking it would be beneficial to have the injectors tested to determine if they are still functioning well. A local shop quoted <$10 each to have them tested and cleaned. Does that seem like a reasonable price?








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    CIS fuel injector test 200 1981

    posted by  DougC on  Sat Apr 12 04:58 CST 2003
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    last visit: Sun Aug 10 08:30 CST 2014
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    Old244,

    When I had my injectors out recently, I replaced the seals, and cleaned up the ports, the plastic retainers, and the outside of the injectors. I didn't clean the injectors on the inside. I'm learning about this. I have a pretty rough idle, even with new seals, and this morning posted some questions about the likelihood of this being caused by old injectors. I'll be interested to see what we find out. I did check FCP Groton today for injector prices for our 81 K-Jets. Sounds like $23 each, $2 total for 8 seals, $6 shipping: $100 total for all new Bosch injectors with OEM seals. I hadn't heard that it doesn't do much good to try to clean an old K-Jet injector. Learning every day! Good luck.
    --
    Thanks to everyone for the help, Doug C. 81 242 Brick Off Blocks, stock, M46; 86 240, 130K








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      CIS fuel injector test 200 1981

      posted by  Mechanic on  Mon Apr 14 06:00 CST 2003
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      Doug, for what its worth, I have 317,000 on my '74 K-jet injectors. Each 50,000 or so I pull the 4 injectors with lines attached and stick them into 4 glass jars so I can see the spray pattern. When you lift the Sensor plate, with the fuel pump running the injectors will start to spray. Lift a little, and it sprays a little, lift it higher, it sprays more of course. They are normally uneven in pattern after that many miles. In a 360 degree pattern, there will be heavy spots and some spots with no spray at all. I then remove the offending injectors, and lift the "Pintle" with two fingernails. I then blow them out backwards with 125 psi compressed air. I screw them back onto the lines and re-test. I had one stubborn one last time that I had two blow out twice, when they were all clean they spray a very nice, even, fine, 360 degree spray, like an upside down funnel. When I re-start the car, it will usually gain 100-150 rpm and is very smooth. Very satisfiying for the amount of work. hth Tom









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        CIS fuel injector test 200 1981

        posted by  DougC on  Tue Apr 15 14:50 CST 2003
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        last visit: Sun Aug 10 08:30 CST 2014
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        Thank you. I understand what you are describing except I don't know exactly which part the sensor plate is, or what the pintle is. Can you point me in the right direction?
        --
        Thanks to everyone for the help, Doug C. 81 242 Brick Off Blocks, stock, M46; 86 240, 130K








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          CIS fuel injector test 200 1981

          uid 27's pic
          posted by  Art Benstein on  Wed Apr 16 03:06 CST 2003
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          last visit: Fri Oct 17 20:10 CST 2014
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          Sensor plate is the part the air pushes up to gauge the airflow -- under the throttle body. Compare your garden hose nozzle with the injector; the pintle is the cone shaped valve stem in the center that moves outward to permit spray. I've never tried to pull it out with my fingernails, just tried forcing it open under pressure from a can of carb cleaner. I'll try it next time.
          --
          Art Benstein near Baltimore








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    CIS fuel injector test 200 1981

    posted by  Jessie on  Sat Apr 12 03:25 CST 2003
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    last visit: Tue Jan 18 17:45 CST 2011
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    Did you mention that they are Kjet injectors? Almost no shops (even Bosch certified) have the equipment to test or clean Kjet injectors. Most other fuel injection systems use the fuel rail/O ring setup, and thats what most shops are set up for. Also from what I have read, what happens to kjet injectors is the spring inside gets weak with age, and cleaning will not help. Plus you can get b rand new injectors from fcp Groton for 28 bucks each. Why waste 10 bucks testing the old ones when you can get brand new ones for a bit more.








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    CIS fuel injector test 200 1981

    posted by  someone claiming to be Mike Gambone on  Fri Apr 11 15:08 CST 2003 [RELATED]

    So thats less than 40 bills to have all 4 checked and cleaned, sounds cheap to me. The CIS injectors open at a certain pressure, might be good to know all is well. On the other hand if she ran well, prior to taking it apart, why mess with it. Just having new o-rings in there should do wonders, I could never get them out on a VW that I used to own. You can always pull 'em out later if you have a problem.







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