Cleaning the TPS
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Joined: Aug 2004
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From: Malmoe
Cleaning the TPS
I have found that most of my performance problems in my -82 origines from the TPS or perhaps even the oxygene sensor but the later I haven´t been able to do something about!
I´ve sprayed some antioxidant in one narrow opening but really want to take the TPS apart from the injectionunit so I can clean it propperly or replace it with a new one. Is it possible to easily put it back in the correct possition after cleaning it ? There is a screw to position the TPS in different angles. How critical is this ? Do I need meters to get the reinstall right. Is this perhaps a job for a wellequipped shop ?
Thank you very much for any answer helping me to understand this !
Peter/Hebbe
I´ve sprayed some antioxidant in one narrow opening but really want to take the TPS apart from the injectionunit so I can clean it propperly or replace it with a new one. Is it possible to easily put it back in the correct possition after cleaning it ? There is a screw to position the TPS in different angles. How critical is this ? Do I need meters to get the reinstall right. Is this perhaps a job for a wellequipped shop ?
Thank you very much for any answer helping me to understand this !
Peter/Hebbe
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
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St. Jude Donor '06-'10, '13
I don't know about the '82 cross fire in specific, but I know about TPS sensors on a whole.
You should know what the reading should be from the TPS in the full open and idle position. Some TPS sensors are adjustable so that when you replace them you need to move them around to make sure they are reading correctly at wide open and at idle. Some are not and you just unbolt the old one and replace the new one and the computer learns the new sensor after a few cycles.
Depending on the price, I would just replace it with a new sensor and get a new O2 sensor as well.
You should know what the reading should be from the TPS in the full open and idle position. Some TPS sensors are adjustable so that when you replace them you need to move them around to make sure they are reading correctly at wide open and at idle. Some are not and you just unbolt the old one and replace the new one and the computer learns the new sensor after a few cycles.
Depending on the price, I would just replace it with a new sensor and get a new O2 sensor as well.
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Joined: Nov 2001
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From: Bay Minette ALabama
Just replace the TPS sensor. If its original equipment than i am sure it wont hurt to install a new one. The angle setup of the sensor is important. The ECM needs the correct signal for the engine to run smoothly and not set any codes. You will need a meter to adjust the voltage to .540V with the throttle closed. There are three wires going to the sensor. A positive, negative, and a refference signal. Just connect the meter to the pos and neg with the ignition in the on position and and adjust the angle till you get the correct voltage then tighten the screws down. Pretty easy to do on your own without having to spend money on a shop to do it.
Ed
A good source for info on the Crossfire engine is the crossfire injection forum
Ed
A good source for info on the Crossfire engine is the crossfire injection forum
Drifting
Joined: Sep 2004
Posts: 1,270
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From: Celeste Texas
It's a PITA but not difficult. You can use safety wire or straight pins to get into the connectors without buying the special tool for that.
Also TPS mount screws are a wierd size. The tap is almost impossible to find. Spray them with WD-40, then clean, then spray them again. Tighten very carefully.
Bill
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From: Malmoe
Thank you very much for your answers ! This knowledge helps a lot ! Now I can try and release the TPS, clean it when it´s unmounted and try to put it back myself. The TPS cost near 100 $ !! so I think I´ll give the cleaning a try. Is it easy to replace the oxygenesensor ?
Peter
Peter
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Joined: Nov 2002
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From: minerva ohio
direct from gm manual is
1. remove TBI unit then TPS as desribed prviosly.loosley reinstall TBI unit on intake manifold without installing bolts remove fuel pump fuse
2. connect three jumper wires between TPS harness and TPS
3. WITH IGNITION ON AND ENGINE NOT RUNNING , measure voltage between senser terminals Band C using digital voltmeter.
4. in closed throttle position. voltmeter should read 0.795-0.845 volts on 4-112 all v8 engines,0.450-0.600
5. rotate TPSas necessary to bring voltage within specifications. tighten screws and recheck voltage.
6. turn engine off remove jumper wires
7. install TBI unit
1. remove TBI unit then TPS as desribed prviosly.loosley reinstall TBI unit on intake manifold without installing bolts remove fuel pump fuse
2. connect three jumper wires between TPS harness and TPS
3. WITH IGNITION ON AND ENGINE NOT RUNNING , measure voltage between senser terminals Band C using digital voltmeter.
4. in closed throttle position. voltmeter should read 0.795-0.845 volts on 4-112 all v8 engines,0.450-0.600
5. rotate TPSas necessary to bring voltage within specifications. tighten screws and recheck voltage.
6. turn engine off remove jumper wires
7. install TBI unit
Last edited by cooter69; Aug 5, 2005 at 01:35 PM.
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From: York PA
Originally Posted by hebbe
Thank you very much for your answers ! This knowledge helps a lot ! Now I can try and release the TPS, clean it when it´s unmounted and try to put it back myself. The TPS cost near 100 $ !! so I think I´ll give the cleaning a try. Is it easy to replace the oxygenesensor ?
Peter
Peter
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Joined: Nov 2001
Posts: 81
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From: Bay Minette ALabama
Shop manual says .525v with a +/- .075
I use a setting of .540 as recommended by the Winaldl diagnostic program i use with my laptop. Seems to work just fine.
A setting of 0.795-0.845 will more than likely throw a fault code.
When changing the O2 sensor (I think 18mm wrench size) its a good idea to put a little antiseize grease on the threads. Also avoid touching the sensing element when installing to keep any oils from your fingers getting on it.
Ed
I use a setting of .540 as recommended by the Winaldl diagnostic program i use with my laptop. Seems to work just fine.
A setting of 0.795-0.845 will more than likely throw a fault code.
When changing the O2 sensor (I think 18mm wrench size) its a good idea to put a little antiseize grease on the threads. Also avoid touching the sensing element when installing to keep any oils from your fingers getting on it.
Ed
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Joined: Nov 2002
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From: minerva ohio
gm spec books are wrong that info was taken out of gm corvette repaire manual and i have been doing them for gm sence the computer age came about. i am going to beleave gm more than a aftermarket program. i fix alot of these cars that have been fixed by some program other than gm . do as you wish gm is always wrong they just happen to build and program the car.
Advanced
Joined: Nov 2001
Posts: 81
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From: Bay Minette ALabama
Originally Posted by cooter69
gm spec books are wrong that info was taken out of gm corvette repaire manual and i have been doing them for gm sence the computer age came about. i am going to beleave gm more than a aftermarket program. i fix alot of these cars that have been fixed by some program other than gm . do as you wish gm is always wrong they just happen to build and program the car.
The aftermarket programs I use are Winaldl, Tunerpro, Tunercat and a wideband O2 sensor. Keep in mind that I am not using the stock 5550 Ecm but a 7747 (code has been hacked) that has been modified with a prominator. Hence I have total engine management control. I can modify any part of the Binary file and upload it to the Ecm.
Yes GM did build and program the car. We are all here to improve on it.
Instructor
Joined: Jul 2005
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From: Oakdale Ca
Originally Posted by Eds82
GM corvette repair manual for stock 82 vette only says .525 +/- .075 volts.
The aftermarket programs I use are Winaldl, Tunerpro, Tunercat and a wideband O2 sensor. Keep in mind that I am not using the stock 5550 Ecm but a 7747 (code has been hacked) that has been modified with a prominator. Hence I have total engine management control. I can modify any part of the Binary file and upload it to the Ecm.
Yes GM did build and program the car. We are all here to improve on it.
The aftermarket programs I use are Winaldl, Tunerpro, Tunercat and a wideband O2 sensor. Keep in mind that I am not using the stock 5550 Ecm but a 7747 (code has been hacked) that has been modified with a prominator. Hence I have total engine management control. I can modify any part of the Binary file and upload it to the Ecm.
Yes GM did build and program the car. We are all here to improve on it.
You converted your CFI to 7747? Cool.
Did you do a write up on the conversion? You know the guys at thirdgen.org would like it.
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Joined: Nov 2001
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From: Bay Minette ALabama
Yep, using CFI that has been converted to a 7747 (truck TBI) ECM.
Most of the Information to do this I got from Thirdgen and the crossfire injection forum. The guy that designed and sells the Prominator is a member of the Crossfire forum.
It's amazing all the things you can do to enhance the performance of these engines after you do a few mechanical mods.
Some people think that if it is computer controlled you are stuck with what GM gave you. There are ways to improve on GM's design.
My car now idles smother than it ever has, quicker throttle response, and has more power throughout the entire Rpm range and still gets 21mpg highway.
Ed
Most of the Information to do this I got from Thirdgen and the crossfire injection forum. The guy that designed and sells the Prominator is a member of the Crossfire forum.
It's amazing all the things you can do to enhance the performance of these engines after you do a few mechanical mods.
Some people think that if it is computer controlled you are stuck with what GM gave you. There are ways to improve on GM's design.
My car now idles smother than it ever has, quicker throttle response, and has more power throughout the entire Rpm range and still gets 21mpg highway.
Ed
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Thread Starter
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Joined: Aug 2004
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From: Malmoe
Got the TPS and oxygene-sensors exchanged by authorized GM shop. According to their instructions he adjusted the new TPS to 0.50 volts i idleposition.
The old oxygenesensor worked in a narrowerer field than it should.
All this have made the trick ! Happy again !
Thanks everybody for support !
But must change to a new oilpreassuresensor myself but it lookes as it is positioned very hard to unscrew.
Any hints from someone out there ?
Peter
The old oxygenesensor worked in a narrowerer field than it should.
All this have made the trick ! Happy again !
Thanks everybody for support !
But must change to a new oilpreassuresensor myself but it lookes as it is positioned very hard to unscrew.
Any hints from someone out there ?
Peter
Le Mans Master
Joined: May 1999
Posts: 6,692
Likes: 29
From: Texas
Originally Posted by cooter69
direct from gm manual is
1. remove TBI unit then TPS as desribed prviosly.loosley reinstall TBI unit on intake manifold without installing bolts remove fuel pump fuse
2. connect three jumper wires between TPS harness and TPS
3. WITH IGNITION ON AND ENGINE NOT RUNNING , measure voltage between senser terminals Band C using digital voltmeter.
4. in closed throttle position. voltmeter should read 0.795-0.845 volts on 4-112 all v8 engines,0.450-0.600
5. rotate TPSas necessary to bring voltage within specifications. tighten screws and recheck voltage.
6. turn engine off remove jumper wires
7. install TBI unit
1. remove TBI unit then TPS as desribed prviosly.loosley reinstall TBI unit on intake manifold without installing bolts remove fuel pump fuse
2. connect three jumper wires between TPS harness and TPS
3. WITH IGNITION ON AND ENGINE NOT RUNNING , measure voltage between senser terminals Band C using digital voltmeter.
4. in closed throttle position. voltmeter should read 0.795-0.845 volts on 4-112 all v8 engines,0.450-0.600
5. rotate TPSas necessary to bring voltage within specifications. tighten screws and recheck voltage.
6. turn engine off remove jumper wires
7. install TBI unit
.525 +- .025
