Jrichker, HISSIN50 one more time plz

mustangGT85 · Dec 17, 2005

also, sorry if this is a dumb question, but how can i check the vaccum signal. what tool do i need? becuase, that is a primary concern of mine. making sure i have correct vaccum.

~Steve

HISSIN50 · Dec 17, 2005

A vacuum gauge is used to test vacuum. On a SD motor (w/o a chip) look for close to 20" hg at idle.

I am not sure on the TPS variance - one of the other smart gents will know.

Good luck.

04sleeper · Dec 17, 2005

mustangGT85 said:
i went to the junk yard and got a new TPS, and the one i have(currently on the Rx-7) is missing a little circle in the top. the one i picked up from the junk yard isnt missing that little circle. do you think that could of been a problem also?

~Steve

Could be. It is just a cover, but if it is missing then it could get stuff in there and cause it to have problems.

Be sure to get one with the correct year as some are different from different years.

jrichker · Dec 18, 2005

mustangGT85 said:
awesome guys. thanks a bunch. i will try this. just an FYI i went to the junk yard and got a new TPS, and the one i have(currently on the Rx-7) is missing a little circle in the top. the one i picked up from the junk yard isnt missing that little circle. do you think that could of been a problem also?

~Steve

Some are made like that. I have an Autozone replacement and it has no cover over the shaft. Works OK, the cover isn't needed .

TheUser · Dec 18, 2005

jrichker said:
4. Check the procedure for your year, on my 90 I have to turn the idle screw until it just touches the tab, then insert a .010 feeler gauge and give it about one more turn. Then you adjust the TPS voltage to .98v, reset the computer. Start it up, if the idle is to low then turn the screw in until it is just right, then readjust the TPS voltage to .98v and reset the computer and start it up. The key is to adjust the TPS voltage and reset the computer whenever the idle screw is changed.

If the idle is fine now, I wouldn't even mess w/ the idle. You can reset the TPS without chaning the idle screw. However, if you DO adjust the idle screw, you MUST adjust the TPS as well. Be sure to pull the neg. battery cable whenever you adjust the TPS (changing idle or not).

That was for those less familiar with this process; I know you know what's up JR!

mustangGT85 · Dec 18, 2005

you know, now that i think about it, when i got the car first running, a friend adjusted the idle screw to bring up the rpms a little bit, but we never adjusted the TPS

~Steve

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