Do I need a new throttle position sensor?

A bit of history first. Ive had a "slow down 5-8" light. Was so bad after driving it for 5mins it would shut the car off. So I pulled every plug apart and used Contact Lube on all connectors. This made the "slow down 5-8" light almost disappear. With a 2-3hour drive it would come on but slowing down would turn it off and never it would shut the engine off. It never came on at full gas, only when going fast and then slow.

So I swaped the MAF from right to left and left to right, my cable would not reach to do a cable swap. I drove the car till I got the same "slow down 5-8" light again.

Returned and swaped the "Throttle Position Sensors", went for a long drive(right after first test) and no lights came on at all............Also I drive the car as hard as I could, droping gears on high rpms and trying everything to get the "slow down 5-8"(or 1-4) to come on and nothing........... just to add something in, when I used contact lube on everything I also put some inside the throttle position sensors. So Im thinking that I might have a temp-o-mental throttle position sensors. What do you think?

Also Id like to add that when hot, out of some random maddess it idles bad sometimes. So I was looking at the idle adjustment screew and thought I might have a play with to see if I can improve it a little and knowing that any change on one side must be made perfect for the other to keep it in balance I noticed that the 5-8 side has a lot more thread on it compared the 1-4. Check out the pic's. So if I adjust this and do a turn on each? or screw them all in and come out the same?


Thanks
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Why I was guessing these in the first place was when I first put contact lube on everything it did make a huge improvement. Infact it was this thread you have posted that made me do it(thanks!). Im going to take the TPS off now, have a feel(which I didnt do before I just lubed them). Go for a run see the difference and then I will re-screw the screws all the way in and evenly out. Aiming for 1000RPM - thanks No Doubt!

thanks for all your help, this forum site is amazing!

 

I think your onto something Miltonian because what I have done today was:

Took the TPS's off, cleaned them went for a run. Last about 2 hours before 5-8 came on.

Car cooled down.

Adjusted the Idle adjustment. I found the 5-8 was max in, letting almost no air in. The 1-4 was 3.5 turns out. I set them both to 3.5 turns and the thing idles perfect at 1000rpm. After a while the 5-8 came on again.

while the car was warm I

swaped the cables of the O2 sensors, so the 5-8 was now pluged into the 1-4 and the 1-4 is pluged into the 5-8. but check this out. The Slow down lights came on straight away and 1 bank was shut down. However the same light would come on(5-8), which I think is strange. While I swaped it I couldnt even drive to the road from my garage.

Went back and swaped it like normal, car ran fine but after a while(15mins of hard driving) 5-8 came on.

Swaped 02 Sensors again to make sure it wasnt a fluke that they worked so badly swaped, same story, still 5-8 came on with 1 bank shut down and couldnt make it to the road.

Swaped back to normal and car run fine for 15mins and then 5-8 came on.

What I dont get is, why when I swap it the 1-4 doesnt come on(maybe bad exhaust temperature ECU, if so, why did it come on so quick with one side and not the other)?

got any ideas why?

Tomorrow I will swap the exhaust temperature ECU's like you said Miltnian and I will see what happens.......... 1am now and Im falling asleep.........

Thanks heaps for all your effort with this.

 

no offense taken at all, I believe there number 37:

http://www.ricambiamerica.com/article_info.php?articles_id=214