I Have A 92 Camaro Z28 With TPI It Is A Speed Density Car/Map Car I'm Replacing The Throttle Body With A Holley 112-507, I Took My Readings From The Car And Im Getting Well Above .61V And About 4.4V WOT I'm Considering Ordering A New One Due To A Dead Spot/Hesitation. Now My Question Is, Is There Any Harm In Ordering A Adjustable TPS Sensor For The Car Vs The Correct Non Adjustable? Also Can Any One Tell Me What It Should Be Set At With A Base Measurement (Throttle Closed) And A WOT Measurement?

Thanks For Any Help In Advance.

 

Not sure what you mean by dead spots...

Are you actually seeing the TPS sensor drop out as you open the throttle?

The voltage readings you're reporting here seem about right for a TPI.

If by "dead spots" you mean hesitation during throttle transitions, that sounds more like an issue with tuning on the accel enrichment.

None the less, adjustable vs non-adjustable is meaningless once you get the TPS closed-throttle voltage set and then tighten the screws. They all operate on the same voltage range.

Once you fire up the car, the voltage the ECM sees at the TPS becomes the baseline voltage by which it determines your throttle position. Example, if you had .61V on the last run, and then replace the sensor and set it at .65V, the next time you fire up the car, the ECM will detect .65V and consider that to be 0% throttle. If you shut the car down, set the TPS to .8V and then fired it up, then the ECM will consider .8V to be 0% TPS.

 

What I Mean By Dead Spot, A Hesitation On Acceleration, Some Time's So Severe The Car Almost Dies.

 

What scanning equipment are you using?

I assume your signature means you have a 412 cid engine? What ECM mask do you have? $8D? If so, are you attempting to run a stock tune on it?

 

And Im Not Using A Scanner Everything Was Done Via Data Logging.

I do have a SBC 412 as in my signature, ECM Mask? $8D??? I Had A Special Chip Burt For The Tune After Many Hours Of Data Logging.

 

Sounds like your accelerator enrichment values are not right then. If it hesitates momentarily when you push the accelerator and then picks up and runs, it's the AE...

That's assuming that everything else is good, like fuel pressure, ignition, etc...

As far as your TPS, you should be able to see if it's bad or not by watching the TPS value on the data logger while you slowly depress the pedal with key on and engine off. It should be a smooth voltage increase from baseline to WOT. Do it when engine is cold and hot (high temperature can sometimes expose electrical malfunctions).

 

ULTM8Z,

I Have Put On The New Throttle Body And Port Matched The Plenum As Well As A New TPS Sensor. I Left The Preset Idle At 850RPMS (Not In Gear) And 700RPMS When In Gear, Even With The New TPS As It Is Not Adjustable It Is Still About .64V Closed And About 4.5V WOT, From What Information I Have Gathered The TPS Should Be About .54V Closed And About 5V WOT How Ever You Stated It Really Doesn't Matter Where Its At Because The ECM Will Read It At 0% Correct? How Ever I No Longer Have The Hesitation As I Did Before. I Know This Maybe A Bit Off Topic But Would I Need A New Tune To Account For The Throttle Body Changes/Porting? Also Do You Know If They Make A Computer That Plugs Right Into The Factory Harness That I Can Make Modifications To Myself Or Maybe A Self Learning Computer?

Thank You For All Your Help!

 

I Also Wanted To Make A Quick Note, The 85-89 TPS Sensor Did Not Work On My Application For What Ever Reason I Could Not Get A Proper Reading.
Thanks For Your Help ULTM8Z!

 

You shouldn't need a recalibration for that. The changes are exceedingly minor and within the ability of the ECM to deal with on the factory calibration.

You also don't need a special computer to make calibration changes. Simply head over to the DIY PROM forum. Your 92 Z28 uses a 7730 ECM which people are re-tuning all the time.

I'm not sure about the self-learning thing... I believe all they do is trim the fuel tables automatically. But with Tunerpro RT history tables and an Excel based VE tuning tool (like my EZ VE tool), you can get the same effect with a couple of chip burning iterations.

Basically with Tunerpro (free download) and a chip burner from Moates with some 27SF512 chips and a chip adapter (about $150 worth of parts) you can be tuning yourself...

http://www.moates.net/g1-memory-adap...-etc-p-32.html

http://www.moates.net/burn2-chip-programmer-p-197.html

http://www.moates.net/c2-sst-27sf512....html?cPath=26

There is also some more advanced stuff from Dynamic EFI which can essentially convert the EPROM based ECM to a more modern flash memory. It'll do away with the chip removal/replacement everytime you do a re-tune.

http://www.dynamicefi.com/

 

Thanks for your reply, I have the cable that goes from the obd plug to a USB port on my laptop to record data from them. The problem I have is I don't know what everything's parameters are supposed to be set at and I don't wanna mess anything up and obviously I can't use other people's information as each engine is different and mine being very much so different I wouldn't know where to even start . But I'll look into it so I can learn and figure it out myself . Thanks again

ProtoMaster22