Throttle Position Sensor??????

[Montell27]

Resently had had starting problems. I took apart my intake manifolds to get to the top bolt on the starter. I removed the TPS from the throttle when doing that. After my starting problem was fixed and everything was put back together when I start my car and give it a little gas and hold it the rpm drops for 1 sencond, revs back up for 1 second, back down and up while holding the gas pedal in the same position. If I rev it real hard and hold it there, No problem. I tried repositioning the TPS and still have the same problem. I get a TPS signal issue on diag codes. Do I need a new TPS, or maybe It not positioned right. Please help. Thanks.

[GrimJack]

Reset the ECU, then check for codes again with the throttle in the idle position. If you still get the TPS code, you need to adjust it using the procedure in the TSRM.

[Montell27]

After reseting the ECU I no longer get that code. (after I repositioned it earlier it since I didn't reset the ecu I still got that code) But I still have the same problem. Any Ideas what it can be.

[supraguy31]

I had the same Problem. Here is what I did, Get someone to sit in the car and Hold the gas pedal so that it hit that mark where your Idle is Bouncing up and down, Once its there, have them hold it and adjust the TPS from there. More than likely its advanced a hair too much and it need to be backed off. Basically, break the screws but not loose and with the end of your Screwdriver or whatever, Lightly tap the TPS until it gets out to the Bouncing Point. (Should be towards the right) Tighten and recheck with the gas Pedal.

Did mine once and havent had any more trouble out of it since. TPS Code should go away after you reset your ECU

HTH
Robert

[Montell27]

Thanks alot for the info Supraguy. I'll have to wait until tomorrow to get some help, but I'll give it a try. Sounds like that may work. Thanks again.

[supraguy31]

Thanks alot for the info Supraguy. I'll have to wait until tomorrow to get some help, but I'll give it a try. Sounds like that may work. Thanks again.


Had to do Quite a few 7Ms this way and it worked 95% of the time, Only 1 did he have infact a Bad TPS. Easy fix, Just take you time and make sure the person in the car has a Steady foot. (Good at hold that RPM level on the mark)

Let us Know how it turns out.

[Montell27]

Problem Appears Fixed, Thanks.

[shaeff]

that doesn't necessarily get it within TSRM specifications though. why not do it the correct way, and remove all doubt?

http://www.cygnusx1.net/Supra/Library/TSRM/MK2/manual.aspx?Section=FI&Page=63

-shaeff

[CBLEGUY]

I agree with shaeff. I had the same problem, and tried to adjust it with my ear, and feeling. You can prob make it stop hunting, but you can create problems elsewhere. I fixed the hunting, but then there was a huge mid-throttle loss of power. These TPS's are complicated, and are integrated into the system deeply. Spend some time with it and the TSRM..

Scott

[supraguy31]

This is just a Quick way to solve a Problem until he could get a TSRM. Ofcourse I have like 3 of them. Yes the TSRM is the best way to go and I would never go against it. Just gave him that Idea just incase he didnt have an OHM Meter and whatnot.

[jetjock]

At least somebody gets it. Before Shaeff posted I was going to list all the things that'd be adversely effected if he took that suggestion but I'm tired of refuting the "I did it and nothing bad happened" mentality. You'd think it'd be stupidly obvious TPS setting needs to be done right from the TRSM's use of tools measuring in the thousands of an inch but I guess not.

[supraguy31]

Maybe I need to just Read and not reply. Sorry if I offended anyone by Suggesting that Method. Again, It was just a Quick fix to something if he didnt have the Proper tools to do it the TSRM way.

Point taken. Back to celicasupra.com I go

[shaeff]

^ it's not that you shouldn't reply. but think of the mannor that's being used to diagnose and repair a KEY sensor in the system on our cars. then if you look at the way it's supposed to be done, you'll see the err of your ways. (and anyone for that matter)

but we're all here to learn man. you didn't offend anyone. well, you certainly didn't offend me! :) we learn from our mistakes. leave behind no opportunity to learn something new. if we all knew everything, there would be no need for supramania.com. that'd be boring. :(

i learn something new every single day i log on, and i love it!

-shaeff

[supraguy31]

Same here, I learn alot from you all. I think thats why I come on this site so much. I know that Im only a MK2 guy but when you get into doing MK2 7mgte Conversions I like to read up on what the Pros like yourself are doing.

I do look at the TSRM alot especially when Im building a Motor with the correct Spec. I dont care if I know them or not (ie Rod Bolt torque to 49ft Pounds or Mains to 75 Ft Pounds) I still look it up to verify.

Now If I could get some Help on Engine Management I would be good to go.

Robert

[jetjock]

Comments are welcome but they need to be informed. It'd take pages to explain but you must never lose sight of one thing: The TCCS controls fuel, timing, and idle. People either forget or don't know every sensor on the engine is involved with all three of those things. Take the TPS and O2 sensor for example. We tend to equate them with fuel control but they're also involved in idle and ignition timing. Or the EGR, it's also involved with ignition timing even though it's not a sensor. Almost everything is integrated in some way. If you want the engine to run as designed you must treat sensors and the things that affect them as important. That means calibration, connectors, wiring, on and on. Trust me, you'll have many fewer gremlins than others if you give these things the respect they deserve.