AB Injector for an AA Injector - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 09-27-2009, 12:26 AM Thread Starter
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AB Injector for an AA Injector

I have a 96 PS that has a cyl. balance fail in Cyl #3. I have a spare AB injector that I would like to try, to confirm the repair. Does anyone know whether this will work to at least confirm the repair ?
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post #2 of 11 (permalink) Old 09-27-2009, 07:50 AM
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it should tell you if the old injector is the problem, but i would not run it in there.

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post #3 of 11 (permalink) Old 09-27-2009, 01:54 PM
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Plus one just get another AA injector. has the solenoid gone bad on the other one, or it just failure all together.

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post #4 of 11 (permalink) Old 09-27-2009, 03:26 PM
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Solenoids basically never go bad.

Does the truck have a miss at idle? If so, did you unplug #3 to see if the idle changed?
You can swap that injector with the one next to it to see if it's the injector.
FYI, #1 is pass front by alt. Odd numbers on pass side, #7 by firewall. #2 is front driver's side near a/c, #8 at firewall. So #3 is second back from the alt on the pass. side.

FWIW, The AB internals are completely different than the AA. I have not tried it myself, but I have been told that the AB will run fine in the older trucks, so in a pinch I bet you could run it. But I wouldn't count on it to diagnose your problem as it might just complicate things. Figure out for sure which injector is bad (if it is an injector issue) and go from there.
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post #5 of 11 (permalink) Old 09-27-2009, 06:04 PM Thread Starter
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I just replaced the injector orings due to a hard/no start condition, but when it ran it ran a little rough at idle, but above idle ran great and had good power. Now after changing injector orings (upper oil ring one #8 injector completely blown out) the truck starts fine but now has a loss of power, I can only get 9-10 PSI of boost. I am consistantly getting #3 fail on CCT and have had #2 and #5 come up as well. I am just wanting to try the #3 injector change to see if it helps. Compression on #3 is 370 PSI, everything seems to be good, nothing left loose or not connected,
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post #6 of 11 (permalink) Old 09-27-2009, 06:51 PM
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AA's are single shot injectors. AB's are split shots. Throwing an AB into the mix with the rest of the AA's will only make it miss on that cylinder. So to answer your question - no, you can't use it to confirm the repair.
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post #7 of 11 (permalink) Old 09-27-2009, 07:13 PM
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Quote:
Originally Posted by Pocket View Post
AA's are single shot injectors. AB's are split shots. Throwing an AB into the mix with the rest of the AA's will only make it miss on that cylinder. So to answer your question - no, you can't use it to confirm the repair.
The AB won't miss on that cylinder, it will just inject a little different amount of fuel than an AA, so it'll still throw a bad CCT test.

I have a customer running 1 AA with 7 AB. Said the truck runs great, would never know it was there.
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post #8 of 11 (permalink) Old 10-02-2009, 03:29 AM Thread Starter
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OK, well I am still having a problem with this truck and I may have caused my own problems. The truck had good power but very hard start, found upper Oring on injector 8 blown out. Replaced all 8 injector Orings. Could not get the rails plugs loose, so after all injectors were installed, removed the glow plugs and rolled the engine over by had to blow the fluid out of the cylinders. After putting the truck back together I bumped the starter several times to confirm that I wasn't going to hydraulic the cylinders. Now I #3,#7,#2 codes on the CCT (P0266,P0269,P0281). I can't see doing any engine damage, but I guess it is possible. I am thinking that although injectors are probably worn, disturbing everything may have caused my problems.
Any thoughts ?
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post #9 of 11 (permalink) Old 10-02-2009, 04:08 AM
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Quote:
Originally Posted by ewales View Post
OK, well I am still having a problem with this truck and I may have caused my own problems. The truck had good power but very hard start, found upper Oring on injector 8 blown out. Replaced all 8 injector Orings. Could not get the rails plugs loose, so after all injectors were installed, removed the glow plugs and rolled the engine over by had to blow the fluid out of the cylinders. After putting the truck back together I bumped the starter several times to confirm that I wasn't going to hydraulic the cylinders. Now I #3,#7,#2 codes on the CCT (P0266,P0269,P0281). I can't see doing any engine damage, but I guess it is possible. I am thinking that although injectors are probably worn, disturbing everything may have caused my problems.
Any thoughts ?
How long did you run it before running the CCT?
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post #10 of 11 (permalink) Old 10-02-2009, 04:24 AM Thread Starter
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I have been on 2 - 25 KM drives, all the air should be out by now. The truck idles pretty well also, it is just this power issue.
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