1989 240SX TPS replacement. What do I need to know before doing it??

[Prelude Guy]

Hey All (Pobably Chris will be the only one who responds though )

I want to replace my TPS sensor. As some of you are aware, I have been struggling with a hesitation issue that I just can't seem to figure out, and I am too proud to take it to the dealer. lol I want to figure it out myself.

Anyway, I spoke to the mechanic who helped me with my H22 swap into my Prelude today. After I explained to him what the issue with my car is, he immediately felt that it was the TPS sensor. I then told him that I've already changed the fuel pump, ignition wires, spark plugs, dist. cap, dist. rotor, O2 sensor, and coolant temp sensor, along with running new gas, injector cleaner, new oil, ran a new ground wire, and cleaned the intake manifold.

I searched and read that a few people say that you need to calibrate the TPS but I never saw a response. I guess it is not a simple plug and play, is it??

Please let me know what I need to do to it to make it work.

Thanks,

Andy

[s13sr20chris]

on your 89...shoot, i cant remember the procedure. i will try to remember to look it up at work. just be glad its not an s14 lol. that procedure is a pain.

[Prelude Guy]

I found someone locally selling one. Should I just take the whole throttle body off and trade him??

[s13sr20chris]

no, then you need a new tb gasket and it would be more work than its worth.

[Prelude Guy]

Chris, I found this info;

"<SOHC> How to Adjust the TPS Bill Davis writes:

Kris, I think that the SOHC TPS are on-off switches. I had my idle start jumping up then start to come back down. It did this for a while until 2 weeks ago it idled at 2100RPMs. It turned out to be that my cruise control cable tightened up causing a VERY slight open throttle. I bought a new TPS before I figured this out (dough!!) My idle was a touch higher than normal (@200RPM) so I turned the idle down a bit and it's been idling great.

Good luck,

Bill

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That's right. The switches connector is the one right on the TPS. One switch for full throttle (not used) and one for the idle. Adjust the TPS in order to make the switch toggle when the throttle is depressed. Check for continuity between the middle terminal and the other to find the correct terminal pairing.

The connector on the harness is for the variable resistor.

Richard Lestage"

What the heck does this mean??

[s13sr20chris]

this may apply to you and it may not. how many connectors are on your tps and how many wires per connector.