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Need help with some TPS issues...

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After a year of being taken apart for an EFI and Turbo upgrade, my Fjord '76 is finally back together, and idling! Sounds great.

Small issue though, my TPS unit doesn't seem to be working. I'm not sure if I have a compatible unit, as some of my information seems to be vague.

This is the unit I am using, http://www.ebay.com/itm/BMW-THROTTLE-SWITCH-E30-325I-325E-325iX-13631707320-/180748424169 and it seems to work when I test it with a digital voltameter, but only through a small part of its range (The resistance only changes through a small part through its range of motion). I will admit I haven't tried calibrating it in megasquirt yet, as it seems that it isn't working as it should.

The source of my confusion over whether or not this unit is compatible comes from Slash02's http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,353786/helpful post on megasquirting the 2002. In the thread he posts 2 TPS units, which are different, as far as I can tell. Do I need the 6pin TPS sensor for this? Or will the 3-pin work, and if it does, does this seem like normal operation?

Thanks guys, you are always helpful.

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You got the wrong one. The switch type does not output the shaft position, it only indicates full closed or full open. You need a potiometer type which all modern EFI systems use. It's Bosch part #: 0280120406 that I have in my hand and use in my E30 IX Haltech P2000 equippped EFI. Like the one in the photo. It is a direct fit, no adapter stuff or drilling or hacking. The 402 works also. Both are a bit scarce used for a decent price.

post-20100-13667666603227_thumb.jpg

post-20100-13667666603907_thumb.jpg

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After a year of being taken apart for an EFI and Turbo upgrade, my Fjord '76 is finally back together, and idling! Sounds great.

Small issue though, my TPS unit doesn't seem to be working. I'm not sure if I have a compatible unit, as some of my information seems to be vague.

This is the unit I am using, http://www.ebay.com/itm/BMW-THROTTLE-SWITCH-E30-325I-325E-325iX-13631707320-/180748424169 and it seems to work when I test it with a digital voltameter, but only through a small part of its range (The resistance only changes through a small part through its range of motion). I will admit I haven't tried calibrating it in megasquirt yet, as it seems that it isn't working as it should.

The source of my confusion over whether or not this unit is compatible comes from Slash02's http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,353786/helpful post on megasquirting the 2002. In the thread he posts 2 TPS units, which are different, as far as I can tell. Do I need the 6pin TPS sensor for this? Or will the 3-pin work, and if it does, does this seem like normal operation?

Thanks guys, you are always helpful.

You have the incorrect one. There are some 3-pin resistive TPSes, but those early units are in fact throttle switches. It appears the 02again unit is NLA. Bah. You can go with the 6 pin sensor, The updates that "themoose" mentioned are correct.

https://www.autopartsway.com/search.cfm?allMk/allY/allMd/allSmd/allEn/allB/allCT/allsct/search:0280120402

I'm sure you can get a better price. personally, I'd go find one at the pick and pull ;)

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I figured as much, thanks guys. I did see the 6-pin TPS isn't exactly cheap.

If anyone has one lying around let me know!

Thanks

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I figured as much, thanks guys. I did see the 6-pin TPS isn't exactly cheap.

If anyone has one lying around let me know!

Thanks

Email me, I'll check my stash.

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Shot you an e-mail (I think), but I'll be out of contact until Sunday most likely.

Thanks

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