kraimer21

iTrader: (10)

replaced the tps on my 98 5spd.; after i adjusted the resistance where it was between 500-4K ohms, the idle went up to around 1300, i swiveled the tps so that the idle was at normal (even though i couldn't get it so stay at 700, i left it at 600), obviously the resistance changed, so now the reisistance is between 300-3200 ohms. question is: is that a small enough change in the resistance that it shouldn't matter?

BigLou93SE

iTrader: (10)

I would say adjust it back to the 500-4000 ohms, and then use the IACV to get the idle back down. I thought there was a TSB though about using the closed idle switch instead of this method...I'll try to find the thread.

edit http://forums.maxima.org/showthread.php?t=421125

-Sin-

You need to adjust via the close open throttle, no continuity vs continuity the Haynes manual can help you with this. You'll then need to reset your idle (did that buy unplugging battery for about two hours since I don't have a Consult)

-Sin-

I have the actual TSB but am not privalaged enough to post it. If NE1 wants to post it I can send it to u.

BigLou93SE

iTrader: (10)

Send it over here, brudda: gooeythe4th@hotmail.com

-Sin-

Ball is in your court now

PeterK

So If I just put a new TPS and disconnect the battery for a while - does it mean that I don't have to adjust the TPS?

-Sin-

you should still set it according to the haynes manual then disconnect the battery

kraimer21

iTrader: (10)

it doesn't make sense to me...you are saying to adjust the tps and disconnect the battery for 2 hours and that will adjust the idle, how will that work, if after adjusting the tps, the butterfly in the throtle body is open wider now what will disconnecting the battery do?

appreciate any input by the way!

-Sin-

Wrote this for someone earlier. It resets your idle point.

You'll need feeler gages. a .012 and .016, you should also go out and get some new bolts that match the threads on the tps screws because you will destroy them taking them out and it's a hell of a lot easier to adjust and tighten. I bought bolts that use a hex key. I think the bolt was something like 4mm x 20mm and uses a 3mm hex key, you also need flat washers and lock washers for the bolts, all bought at Sears hardware store. Buy the hex key with the ball at the end so it can swivel. You can take off ONE of the tps screws and still be able to drive around, at least I was, so you can match it up. The new bolts will be a little longer but that’s OK, I know the length was 20. I am guessing you have your own multimeter. A small mirror will help you too and a magnetic pickup tool in case you drop the screws.

Now to install... take off the both harnesses and remove the old tps. Take a look at the throttle body to get the orientation of how the tps engages the throttle body. Now insert one of the bolts washers comb into the tps hole furthest away from you and screw that in first (it’s the hardest bolt to get in), make sure that the tps engages the throttle body correctly, then tighten till the tps is flush but still moveable then insert the bolt washers comb in the last hole. Using the .012 feeler gage as shown in figure A32 (between throttle stop and throttle) of file that I sent make sure there is an ohm reading on pins 5 and 6 then use the 016 feeler and adjust until there is NO ohm reading. Put the 12 back in and make sure ohms are still there open the throttle half way and let it close on the 12 and check again. Put the 16 in check for no ohms, open the throttle half way and let close on the 16 and check again. Tighten the bolts but keep checking ohms and NO ohms using the feelers and half open throttle process. Tighten as tight as you can using the hex key and do a final check using the half open process. Once you have the bolts tighten and check for ohms and no ohm, reinsert the harnesses but do it gently as to not move the tps. Now if you start your car, it will rev around 1500rpms and not go down since the idle has not been reset so you’ll need to reset the idle. Since I don’t have the consult tool to reset the idle I just unplugged the battery for about 2 hours. Once that’s done start the car, it will be around 1300rpms but will drop back to normal. I check the ohms and no ohms about 2 additional separate times after driving to make sure everything was still in spec, heat can change resistance. I think that’s it. How this helps.


edit- anyone chim in if I missed something or have something wrong.

kraimer21

iTrader: (10)

i just disconnected the battery so in a few hours i'll check to see if anything has changed...thank you, sin!

kraimer21

iTrader: (10)

hey, sin can you send me the TSB? I disconnected the battery for over 5 hours and the rpms didnt drop even after the car warmed up for a while...

BigLou93SE

iTrader: (10)

HERE IS THE TSB FOR TPS ADJUSTMENT.
(Sorry about the shiesty resize, I tried to get it up as soon as possible.)
http://i3.photobucket.com/albums/y90...ment/TPS_1.jpg
http://i3.photobucket.com/albums/y90...ment/TPS_2.jpg
http://i3.photobucket.com/albums/y90...ment/TPS_3.jpg
http://i3.photobucket.com/albums/y90...ment/TPS_4.jpg

-Sin-

Take it for a drive and it will go down, your computer has to relearn the parameters. The TSB uses the Consult tool which I don't have so I used the old disconnect battery thing. My rpms stayed pretty high around 1300 but after I drove it it droped back down to ~700 park and 500 in gear.

-Sin-

The tps has no affect on the butterfly, if your seeing this then you have the tps in wrong. The tps reacts to the butterfly to send a signal to ecu infoming it of it's open status. Disconnecting the battery should erase the driving parms in the ecu so you need to drive the car to allow it to relearn the parms and new settings.

Now this part is speculation and I hoping someone can chime in on this,
Speculation-
the wide open/closed sensor on the tps is more use for autos. It tells the computer if the car should be in gear. The only reason I state this is when I had set the TPS initially using the 500-4000 rule the wide open/closed sensor would trip only when the accelerator was push ¼ of the way. The car was not going into 1st gear. After I adjusted it using the TSB it was fine (but I still have some fine tuning to do).
End of speculation