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Old 04-21-2017, 07:41 AM   #1
5Toes
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has anyone ever read the DME's fault codes WITHOUT a stomp test???

my car the stomp test wont work (and yes I know the procedure). I believe it is because my Dinan big bore throttle body has the throttle shaft 180 degrees out. my CEL was on forever it seemed, then after a week long vacation it went out for a month - now its back on.

I have never been able to get the stomp test to work on this M42 - is there a way to "trick" the DME into displaying the codes? perhaps jumpering a few pins on a connector? I dont know.. and a search didnt bring back much.

My best idea now is to use a paper clip on the TPS connector to simulate WOT 5 times in a row - thoughts?
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Old 04-21-2017, 09:54 AM   #2
AndrewBird
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The M42 TPS isn't just a switch like M20s, it is a potentiometer that sweeps through a range of resistances (same switch as M50). Jumping the pins likely wouldn't work.

Having the throttle shaft 180 out I would think would cause issues with running. Are you sure it is out? I'm fairly certain the TPS has stops in it that keep it from over rotating, so you can't put it on backwards.
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Old 04-21-2017, 10:36 AM   #3
5Toes
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the throttle shaft was keyed opposite of original, its an e36 throttle body. I used a die grinder to essentially make it rectangular and compatible for e30 or e36.

The car runs pretty damn good, but could be better. just curious what the CEL is for.

Car idles fine but hunts at times. pulls hard all the way to 7,000 but I noticed some bumps in my powerband the other day.
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Quote:
Originally Posted by slammin.e28guy View Post
Holy fuck. Don't fuck with Toes.
1988 325is - zinno/natur - all original + never get to drive
1991 318i - brillantrot/natur - slutty AF daily

Quote:
Originally Posted by nrubenstein
At this point, no one even remembers what they looked like brand new...
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Old 04-21-2017, 10:41 AM   #4
ForcedFirebird
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With the rectangular mod, it might not be reaching the full spectrum of the potentiometer. Could try taking it off the TB and doing it by hand. Motronic 3.1 uses a 0-5v unlike the earlier switch as Andrew said.

EDIT: For future reference, you can remove the shaft and rotate it 180 like some do when fitting an m50 TPS to an m20 TB.
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Old 04-21-2017, 12:24 PM   #5
5Toes
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It may not be. I have tried removing the shaft before on a m20 TB and it was very difficult. Was not interested in potentially damaging this Dinan BBTB.

I have tried running the car with the brand new TPS plugged and without, I can hardly tell the difference!
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Originally Posted by slammin.e28guy View Post
Holy fuck. Don't fuck with Toes.
1988 325is - zinno/natur - all original + never get to drive
1991 318i - brillantrot/natur - slutty AF daily

Quote:
Originally Posted by nrubenstein
At this point, no one even remembers what they looked like brand new...
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