It's been years, to just learn to drive it. Still, the throttle pedal is so direct, so sensitive on/off it is not right. My second 528i has at least some smooth mush in it to know the difference.
I've disconnected the throttle switches, which is not a solution, but it takes some of the sensitivity out. The linkage bushings are new. Timed correctly.
Is there a place to start ? My plan is to replace components one at a time until it's right. AFM, throttle body, ???, ECU ?
Very strange. Otherwise it runs just fine.
Sensitive throttle, last try.
Thank you, but it's not the linkage set up, it's the, " Right now !" throttle response. Add pedal, " Now !" Off pedal it'll blow the horn with your nose.
You might think that's a cool race car thing, but it's very annoying. It takes an educated foot and extra monkey business working the clutch pedal to avoid the associated on/off throttle jerkiness.
You might think that's a cool race car thing, but it's very annoying. It takes an educated foot and extra monkey business working the clutch pedal to avoid the associated on/off throttle jerkiness.
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JodyStevens
- Posts: 347
- Joined: Wed Sep 12, 2012 9:58 am
- Location: Nova Scotia, Canada
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socalfiver
- Posts: 229
- Joined: Wed Jul 21, 2010 12:31 pm
- Location: Los Angeles, CA
I have to claim incompetence. The car is a 1981. I rebuilt an engine from a 56,000 mile '80, connecting the '81 ECU wire harness, injectors, and one of the three throttle bodies, AFM's I've managed to collect from previous '79 to '81 528's, 633, 635.
All of which look alike to me, unless there are very subtle part numbers to check go together.
The '79, '80, '81 throttle switches are different from the '78 single switch (harness plug in), and it took awhile to adjust the low end switch to click off at the last possible instant. Earlier was a real off throttle jerk mobile.
The switches work, although disconnecting the off throttle seems to mitigate the sensitive throttle pedal. Not great but better.
As before, my plan is to change out AFM's, throttle bodies, switches one at a time to see if anything works.
All of which look alike to me, unless there are very subtle part numbers to check go together.
The '79, '80, '81 throttle switches are different from the '78 single switch (harness plug in), and it took awhile to adjust the low end switch to click off at the last possible instant. Earlier was a real off throttle jerk mobile.
The switches work, although disconnecting the off throttle seems to mitigate the sensitive throttle pedal. Not great but better.
As before, my plan is to change out AFM's, throttle bodies, switches one at a time to see if anything works.
Have you swapped distributors? If one curve is different either by design or 30 years, a faster advance curve could create what you are experiencing. Are they the same? Both single or dual diaphragm? Vacuum ports hooked up right? Feel the spring tension on the rotor with it off obviously, do they feel the same? Is idle timing the same assuming 2200 timing is?
Mike W.
02 525ita. Wife's, aka grocery getter
02 530i. New to the fleet, 3 pedals.
03 QX4, AKA the Datsun. Finally got the 4WD vacationmoble to stop smoking.
07 Xterra. Still on the DL, a purchase from hell.
02 525ita. Wife's, aka grocery getter
02 530i. New to the fleet, 3 pedals.
03 QX4, AKA the Datsun. Finally got the 4WD vacationmoble to stop smoking.
07 Xterra. Still on the DL, a purchase from hell.
Vacuum advance
+1
Reread my posts about this from years ago. I suggested you check/evaluate the vacuum advance mechanism on the dizzy and told you how to do it.
Best of luck.
Reread my posts about this from years ago. I suggested you check/evaluate the vacuum advance mechanism on the dizzy and told you how to do it.
Best of luck.
HTH
'80 528i
'80 528i