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Discussion Starter #1
Could anyone do me a favor and take a few really close up pics of the TPS so i can see the bolt pattern and how it bolts on, how many wires it has on it and what the clip looks like...etc Im looking into trying to convert my 84 rectangle TPS to an 85+ round one. Thanks a bunch

Ausitn
 

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Just curious, but why do you want to swap your TPS for the newer style? I don't know for sure, but the newer style TPS may only work with the newer 85-86 ECU.
 

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Here are some pics of one that I have out of the car:



<img src=http://www.hpphoto.com/servlet/LinkPhoto?GUID=48716e95-4aa2-1f91-416d-7c05836641f8&size=>

<img src=http://www.hpphoto.com/servlet/LinkPhoto?GUID=2abd24e4-7f32-2193-e77c-7b156263d9d0&size=>

<img src=http://www.hpphoto.com/servlet/LinkPhoto?GUID=4210ef71-49e6-4fc9-d049-6b6227bb20ce&size=>

<img src=http://www.hpphoto.com/servlet/LinkPhoto?GUID=314269a0-304d-3dd1-27cc-7f6239211f8d&size=>

HTH :p
 

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Austin,
Your '84 ECU won't have any idea what an '85 pot type TPS is telling it. Except maybe at idle and WOT.
Jamie
 

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Discussion Starter #5
well thats not true, I mean obviously Id have to wire it in to work properly. What about the knock sensor? I have the tap on my block and an empty slot in my ecu for it. So if I wire one up to the stock location all the wy to the ecu do ou think an 84 mt ecu would be able to adjust ign timing accordingly like the 85+? If not then how does everyone hok up knock sensors? Do they just get a meter with voltage output and use that, or is there a better way? Cause how would you know how much knock count your getting by a voltage signal?
 

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Most thread-in type knock sensors utilize a piezo electric crystal type transducer that responds to the frequency of engine knock and transmits a variable millivolt signal to the ECU when knock occurs. The older ECU's (pre 85) may not have the internal electronics for a knock sensor connection even though the connector has an empty slot. The earlier model ECU's (82-84) are designed and programmed to be used with the switch type TPS. Why not just swap your 84 ECU for a 85 ECU, add a knock sensor and later type TPS? 8)
 

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Discussion Starter #7
Well thats a pretty expensive move to take I think... I mean not only that but they are nt going to be easy to find...and I can imagine that simply switching the tps and knock sensor is all I will have to do to make everything work...theres probably a bunch more.

Austin
 

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MKIIBeater
I have one 85 mkii, I beleive with an older block. The owner moved the knock sensor to the waterhousing (I think that what it calls). I also have the sensors and the about 3 tps.
thanks!
 

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Heya!

Sorry this is a little off topic, but what effect does moving the TPS around via the bolts have on the car?

I just got a new Throttle valve housing with a TPS still attached and it's positioned differently to the one in my car now...I was just wondering what the TPS actually does and would it matter if the position of it is altered?

My car idles a bit rough, could a wrong position of the TPS be a cause of the rough idle?

Thanx guys. :)
 

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Sorry, I was alittle off there.I type this respond while I was working using labtop with wireless and got disconnected before I can read it over. I meant one of my supras the knock sensor was move to where the location of the cold start sensor at.
And I also have 3 spare tps.
thanks!
 

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This thing is interesting cause I have a 85 MK2 Auto... I have blown my auto 2 yrs ago and swapped a W58 and still retained the 85Auto computer and no problems and still running the AUTO computer and I have a 85 MANUAL ECU and swapped it if there would be any diferrence and reset the system and run it for about 4 months and no difference at all.

and here is the kicker for this topic... I have a 84 AUTO ECU and used it just for fun on my 85 MK2 and the thing worked with no problem with drivability... everything worked fine... the only way to find out if the two computers are different is to open it up and see the schematics of those computers...

I would do some more testing on the 84 ECU on the 85MK2

JAY
 

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:wink: ECU schematic :?: Good luck! Finding that wonderful piece of info. is probably wishful thinking at best. Although.....sometimes miracles do happen! :lol:
 

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Dave A. said:
:wink: ECU schematic :?: Good luck! Finding that wonderful piece of info. is probably wishful thinking at best. Although.....sometimes miracles do happen! :lol:
I know that the scematics of the ECU would be a hard to find... I am still wondering why the 84 ECU worked on the 85 MK2.

Jay
 
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