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Originally Posted by muleears
This is an '83 W126 with 152K. I have some concerns and some proposed repairs please tell me if there are more or if I am on the wrong track. Both fuel filters have just been changed.
1. Starts easily and idles smooth, but, has NO POWER when cold and improves somewhat when warmed up, but still way under normal power. I plan to a) adjust the valves, don't know when last done, b) clean banjo bolt and boost controller, c) adjust ALDA, d) clean injectors, e) check pump timing
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Agree with all of the above. Be aware that the ALDA may not provide the desired adjustment due to the inability to move the screw sufficiently (don't snap it). You could always remove the ALDA for testing purposes to see if the power returns. It's two wrenches and two minutes on the SD.
Quote:
Originally Posted by muleears
2. Upshifts very quickly (could be related to #1 above) It's in 4th by 33 mph, regardless of pedal position, it shifts before much boost is evident. Shifts are of correct firmness. Doesn't downshift until almost stopped. It will shift normally if shifted manually. Will downshift when kickdown is depressed. Improves as it warms but still shifts much too early. Has a 1-2 flare when cold. I plan to a) fluid and filter, b) adjust bowden cable (have adjusted two turns (half turn at a time) with improvement). c) check vacuum controls of transmission (will need further help with this)
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This is most certainly a failure of the Bowden cable. Either it's wildly out of adjustment or simply disconnected under the hood. The cable must be properly attached to the throttle linkage and it must extend as the throttle linkage opens the rack.
If you properly make the adjustment to get the power back in the first paragraph, the problem of the 1-2 flare will disappear.