Houpty GT
Veteran Member
Break them apart with a pair of side cutters
Quantity Adjustor Cleaned!
- Thread starter Deereman76
- Start date
DanG144
Top Post Dawg
Houpty,
Going to make the GTG in January? Or perhaps Asheville?
Dan
Going to make the GTG in January? Or perhaps Asheville?
Dan
Dorsal
Veteran Member
sticky? very nice work
Hakcobra
Well-known member
I just cleaned my QA today and so far so good. The engine was surging very badly and the QA was bouncing around. Just got back from a test drive and so far so good. Thank you for the write up. Found a bunch of debris, metal shavings, dirt, etc. once I pulled the circuit board up. Hopefully this will get me by till I can have it rebuilt.
Houpty GT
Veteran Member
This dude made a video on QA cleaning and adjustment. I would have taken it off the car to do it but it still seems like a valuable video.
https://www.youtube.com/watch?v=nd50iJIlvkI
https://www.youtube.com/watch?v=nd50iJIlvkI
Houpty GT
Veteran Member
I was having an issue with idle balance (Group 13). It would either hunt back and forth from the limits (-2.99 to 2.99) or just peg out 2 of the cylinders at 2.99. I installed a quantity adjuster of unknown condition and it did not fix the issue. I then disassembled my QA from the old repair and cleaned out all the metal that was in it. After reinstalling, it fixed my idle balance but I am having a problem getting group 19 to give me voltages that will satisfy both the lower limit and the upper limit. Currently, I have 0.940 and 4.100 volts. My volts from the last cleaning and the tolerance are listed below. Currently this gives me an upper limit fault. You can see how, if I increase the arm position, it will give me a lower limit fault. Does anyone know a fix for this? Maybe, I need to check my solder connections?
From my last rebuild:
Group 19 0.880 & 4.640 volts.
Tolerances:
Group 019 (Quantity adjuster)
Block 1;Voltage from modulating piston displacement sensor: 0.500 - 0.970 V
Block 2;Voltage from piston displacement sensor: 4.150 - 4.740 V
From my last rebuild:
Group 19 0.880 & 4.640 volts.
Tolerances:
Group 019 (Quantity adjuster)
Block 1;Voltage from modulating piston displacement sensor: 0.500 - 0.970 V
Block 2;Voltage from piston displacement sensor: 4.150 - 4.740 V
Houpty GT
Veteran Member
Fixed!
After a year of the check engine light and blinking glow plug light, the pump started running worse in 5th gear below 70 MPH. I finally cleaned the QA again and there are no more faults and it is smooth running again. I set the modulating piston displacement sensor voltage to 0.56 volts and that brought group 19 into tolerance.
I checked my solder welds and one of them did seem to have more resistance than the others. After the repair, they were all within 0.1 ohms.
The metal buildup does mean that the pump is dying. I have a used 11mm pump on the way. I put over 120,000 miles on this used 11mm pump after rebuilding the QA when I bought it years ago. This is such a fantastic thread.
After a year of the check engine light and blinking glow plug light, the pump started running worse in 5th gear below 70 MPH. I finally cleaned the QA again and there are no more faults and it is smooth running again. I set the modulating piston displacement sensor voltage to 0.56 volts and that brought group 19 into tolerance.
I checked my solder welds and one of them did seem to have more resistance than the others. After the repair, they were all within 0.1 ohms.
The metal buildup does mean that the pump is dying. I have a used 11mm pump on the way. I put over 120,000 miles on this used 11mm pump after rebuilding the QA when I bought it years ago. This is such a fantastic thread.
cumminsfromthecold
Veteran Member
Thanks to Deereman76 and others for this thread. Going for it on the ‘97 1Z quantity adjuster. About 206k on the original IP. Excellent thread!
Edit. Did everything Deereman76 posted. Soldering went surprisingly well. Truck started, idled rough, wouldn’t shut off w the key, had to stall it. Different starts and idles each timenI turned it on. Observed the sweep and that seems to be where the problem lies. The sweeper catches on something. In different locations. The iron core seems to have worn or something, preventing a smooth sweep. With ~206k on the original 1997 QA, I guess it’s time for a pump rebuild. The Hans option… Anyone had luck with that?
Edit. Did everything Deereman76 posted. Soldering went surprisingly well. Truck started, idled rough, wouldn’t shut off w the key, had to stall it. Different starts and idles each timenI turned it on. Observed the sweep and that seems to be where the problem lies. The sweeper catches on something. In different locations. The iron core seems to have worn or something, preventing a smooth sweep. With ~206k on the original 1997 QA, I guess it’s time for a pump rebuild. The Hans option… Anyone had luck with that?
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