my 84 GSL-SE is having some issues idling since I installed new injector seals. To do this I removed the upper Intake, and while I was in there, replaced lots of bad vacuum hose. Now it will start, but it jumps from 500 rpm to 1500, then comes back down and does it again. I would really like to make this stop. Also the tps was tapped closed by the previous owner... I also can't adjust it so that I get voltage only on one test lead, I either have it at both, or neither. Does this mean-sound like a bad tps? as they are $200+ I don't want to buy one only to find that it didn't fix my problem.

thanks for the help in advance,

Christopher King

if the TPS doesnt adjust, it'll do the 500-1500 rev thing...



but since you just changed all the vacuum lines, maybe its worth looking at em, maybe theres a crossed one?

I have been looking at the diagrams from the shop manual and the training manual and everything looks good... but I could be wrong... would anything but the biggest vacuum leak - mess up cause that big of an idling issue? but a bad tps will do this correct?

thanks for the help

it'll also do it, if the secondary throttle plates are open

mine has all the same symptoms but it does it at random. does your car do that too? what ever the solution to this is i will be thankful for as well.

thanks for the info, how does one check-fix the secondary throttle plates being open?

have a great one...

i open the hood, and push em closed, if the idle gets better, then they were open. the secondary plates are the upper ones, and if you open and close the throttle manually under the hood, you'll see what i'm talking about.



the fix varies, if you're lucky you can clean it out (they carbon up) if you're unlucky the throttle body bores are worn out

thanks for the info, how does one check-fix the secondary throttle plates being open?

have a great one...

sorry for the double post...

my car dosent do this anymore???? i dont know why, i didnt do anything to it yet???? https://www.nopistons.com/forums/pub...IR#>/wacko.gif

You have an intake leak. Almost everyone that takes an upper intake off and puts it back on usually has a leak. The gaskets aren't the best for sealing. You may have to take it back off, clean both surfaces real good, and then use RTV or Permatex Gold. This will give you a good seal.

Mine will do the same thing every once in a while... I found the messing with the cold idle screw and the idle air/fuel mixture helped... For some reason my TPS sensor with the screw in it, i can turn and turn and turn and nothing will change.. but it seems to run fine. Though while driving it will surge and you can feel it.. Still need a good tune i guess

Mine will do the same thing every once in a while... I found the messing with the cold idle screw and the idle air/fuel mixture helped... For some reason my TPS sensor with the screw in it, i can turn and turn and turn and nothing will change.. but it seems to run fine. Though while driving it will surge and you can feel it.. Still need a good tune i guess/





Try reading through this... I Know mazdatrix has a part the helps with the tune.. thought i can never seem to find it



http://mrmazda.no-ip.com/gslseidle.html

Thanks for all the info, I will be with my car fairly soon, and will look into it some more. I have already read that page, but it is useful to get a refresher. I already have used permatex while i was waiting on the gaskets to come from who knows where... still doing this, however I think it might be my hard line from the air cleaner-maf to the throttle body, that is leaking... I will look into this in a few days when I get back to my parents house.

Happy holidays all,

Christopher