Throttle position switch

[76Datsun280z]

I just placed an order for a tps for my 280z because the original was tested and is not working correctly. I was wondering if would what exactly it does, I know that it revs the engine up to about 1500rpm on cold starts which it doesn't do now, but I was wondering if what else it does. Thanks for any info.

[zKars]

The throttle valve switch has two sets of contacts for your car. At idle, one set of contacts is closed. When the throttle is opened any amount they should open.

At full throttle, the other set of contacts close but are open at all other times. This is for fuel enrichment correction.

Easy thing to test. Perhaps all it needs adjusting or the contacts cleaned.

[sblake01]

I just placed an order for a tps for my 280z because the original was tested and is not working correctly. I was wondering if would what exactly it does, I know that it revs the engine up to about 1500rpm on cold starts which it doesn't do now, but I was wondering if what else it does. Thanks for any info.

The area I highlighted in your post is not a function of the throttle switch. What you describe is what the auxiliary air valve does. Look at these two attachments.

[76Datsun280z]

The area I highlighted in your post is not a function of the throttle switch. What you describe is what the auxiliary air valve does. Look at these two attachments

Thanks for the info. Also, with the tps connected, if you're in second gear for example and you hit about 2800 rpm, a wiplash effect happens because I learned that one set of the contracts tells the efi computer to shut off the injectors at 2800 for de accleration if one set of the contacts are corroted. And by disconnecting the tps, this goes away.

[76Datsun280z]

Well I just got the new one in the mail today and put it on. The past few weeks I have been driving with it un plugged. Right after I put the new one on I took it down the street and it did the whiplash thing where it shuts off the injectors, so I took it back home and read in my manual on how to adjust it. I tried adjusting it as it said to do in the manual and then took it out on a long drive and it didn't do it once, so I'm hoping it worked.

[sblake01]

So it actually sounds to me like your old one was okay and just needed to be properly adjusted.

[76Datsun280z]

That may be so, yes.