MY 85 TPS harness
05-07-2015, 08:43 PM
#16
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Thread Starter
Andrea, as Dave said replacing the TPS harness can be done, but you need to remove the "T" over the throttle body. There should be two large hose clamps over the rubber sleeve. One at the bottom that seals the sleeve to the throttle body and one on top that seals the the sleeve to the "T". You just need to loosen the top one and I was able to loosen it from the passenger side with a long screw driver. But it really depends on how that hose clamp is orientated. There is also a rubber hose connected to the "T" with a small hose clamp that you can get to from the driver's side. Once the "T" is loose from the large clamp it doesn't just pull up. You need to angle it just right to get it up past the rear and front intakes.
I don't remember if the small hose connected to the "T" goes to the ISV or out to the front of the engine.
With the "T" out you will be able to see the harness connected to the throttle body easier from the driver's side. If you are tall enough you might not have to lay over the engine like I did. I used a bent nosed needle nose to remove and install the harness.
Taking the intake "T" out is the easy part. Getting it back down and into the rubber sleeve is the bitch. I had my airbox and MAF out and reached my left arm (standing on the passenger's side) under the rear intake with a small plastic putty knife to help guide the "T" into the sleeve and keep rubber sleeve from pinching. My right hand was holding and wiggling the "T" into place. It took me very many tries to get it to seat correctly without any pinched sleeve areas. It will sit nice and stable when it's in correctly.
I don't remember if the small hose connected to the "T" goes to the ISV or out to the front of the engine.
With the "T" out you will be able to see the harness connected to the throttle body easier from the driver's side. If you are tall enough you might not have to lay over the engine like I did. I used a bent nosed needle nose to remove and install the harness.
Taking the intake "T" out is the easy part. Getting it back down and into the rubber sleeve is the bitch. I had my airbox and MAF out and reached my left arm (standing on the passenger's side) under the rear intake with a small plastic putty knife to help guide the "T" into the sleeve and keep rubber sleeve from pinching. My right hand was holding and wiggling the "T" into place. It took me very many tries to get it to seat correctly without any pinched sleeve areas. It will sit nice and stable when it's in correctly.
Last edited by Andre The Giant; 05-07-2015 at 08:46 PM. Reason: Mistake on name
05-07-2015, 08:45 PM
#17
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I would caution you about waiting too long to remove the intake, there is, as the Ducman notes, "a lot of junk under there". You really don't want an oil fire...
05-07-2015, 08:46 PM
#18
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05-08-2015, 07:21 AM
#19
Craic Head
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Great work Andre!
It's a real shame you don't have the time for the refresh. It's pretty gross in there.
The TPS is probably full of oil from the throttle, one of the reasons for the intake refresh is to replace all of the rubber that has long since pretty much fossilized and there is an O-ring that is inside each end of the butterfly pivot rod (or whatever it's called). This was the cause of one of my many intake leaks. The o-ring gets old, dries out and then spits oil out into the TPS which covers the contacts and prevents continuity, and alternately allows for unmetered air to get into the TB from both ends (probably mostly the other end since this end only goes into the TPS housing).
If your TPS is original, it should be replaced. Most of the contacts in the 928 are metal to metal spring type and they corrode/wear out.
Unfortunately until you get in there for the refresh, it will continue to spray oil into it so it may go bad again before you get to it, but at that point you should be able to just clean it out and re-use it (I would guess).
I'll e-mail the intake refresh write-up I did anyway, so you can be ready when the opportunity arises.
Good luck!
It's a real shame you don't have the time for the refresh. It's pretty gross in there.
The TPS is probably full of oil from the throttle, one of the reasons for the intake refresh is to replace all of the rubber that has long since pretty much fossilized and there is an O-ring that is inside each end of the butterfly pivot rod (or whatever it's called). This was the cause of one of my many intake leaks. The o-ring gets old, dries out and then spits oil out into the TPS which covers the contacts and prevents continuity, and alternately allows for unmetered air to get into the TB from both ends (probably mostly the other end since this end only goes into the TPS housing).
If your TPS is original, it should be replaced. Most of the contacts in the 928 are metal to metal spring type and they corrode/wear out.
Unfortunately until you get in there for the refresh, it will continue to spray oil into it so it may go bad again before you get to it, but at that point you should be able to just clean it out and re-use it (I would guess).
I'll e-mail the intake refresh write-up I did anyway, so you can be ready when the opportunity arises.
Good luck!
05-08-2015, 08:26 AM
#20
Rennlist Member
Thread Starter
Great work Andre!
It's a real shame you don't have the time for the refresh. It's pretty gross in there.
The TPS is probably full of oil from the throttle, one of the reasons for the intake refresh is to replace all of the rubber that has long since pretty much fossilized and there is an O-ring that is inside each end of the butterfly pivot rod (or whatever it's called). This was the cause of one of my many intake leaks. The o-ring gets old, dries out and then spits oil out into the TPS which covers the contacts and prevents continuity, and alternately allows for unmetered air to get into the TB from both ends (probably mostly the other end since this end only goes into the TPS housing).
If your TPS is original, it should be replaced. Most of the contacts in the 928 are metal to metal spring type and they corrode/wear out.
Unfortunately until you get in there for the refresh, it will continue to spray oil into it so it may go bad again before you get to it, but at that point you should be able to just clean it out and re-use it (I would guess).
I'll e-mail the intake refresh write-up I did anyway, so you can be ready when the opportunity arises.
Good luck!
It's a real shame you don't have the time for the refresh. It's pretty gross in there.
The TPS is probably full of oil from the throttle, one of the reasons for the intake refresh is to replace all of the rubber that has long since pretty much fossilized and there is an O-ring that is inside each end of the butterfly pivot rod (or whatever it's called). This was the cause of one of my many intake leaks. The o-ring gets old, dries out and then spits oil out into the TPS which covers the contacts and prevents continuity, and alternately allows for unmetered air to get into the TB from both ends (probably mostly the other end since this end only goes into the TPS housing).
If your TPS is original, it should be replaced. Most of the contacts in the 928 are metal to metal spring type and they corrode/wear out.
Unfortunately until you get in there for the refresh, it will continue to spray oil into it so it may go bad again before you get to it, but at that point you should be able to just clean it out and re-use it (I would guess).
I'll e-mail the intake refresh write-up I did anyway, so you can be ready when the opportunity arises.
Good luck!
I appreciate you sending me your intake refresh document, all the time you spent making this, it is precious in my eyes since I will have to do that work next summer more than likely
Next step for now is getting a pair of long nose pliers with a 90 degree bend in them so I can disconnect that connector. Does anyone know or remember which side of the connector has that metal bracket sticking out of so I can compress and pull on the harness, facing the engine is it on the left or right side of the TPS ?
05-08-2015, 04:08 PM
#22
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Thread Starter
I needed to find a way to disconnect the plug from the TPS without removing the intake and I finally found a way.
05-11-2015, 09:17 AM
#23
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Yesterday I got myself some tools to be able to reach that connector. I was only going to purchase one set of 90 degree needle nose pliers at $ 19.99 for one, but when I saw that I could get a set of three, one straight, one 45 degree angle and one 90 degree angle for $ 15.99, when original price was $ 39.99, well I took the set.
http://www.canadiantire.ca/en/pdp/ma...l#.VVCc9fAkeq4
Tonight will be my first try at removing this harness connector.
http://www.canadiantire.ca/en/pdp/ma...l#.VVCc9fAkeq4
Tonight will be my first try at removing this harness connector.
05-11-2015, 07:23 PM
#25
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Thread Starter
05-11-2015, 07:43 PM
#26
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Thread Starter
Latest update
Finally succeeded in removing the old clip from the TPS side, even without the help of my new tools, just a good old screwdriver to pry the clip away from the connector and voila ! Then the other issue started to put it in securely I had to squeeze the connector pin to lock it in place, I had no idea how I was going to do that until EUREKA I was able to push the pin to the correct side with the good old screwdriver again and then push the cable/connector in to hear it click, what a great feeling. I then took the shopvac to clean as much debris as possible, for now, you will see by the pics. Then I start to putting things back together and as soon as I try to connect the second thing, the T connector, I run into another issue, I can't manipulate the T connector enough to get it into the rubber sleeve on the throttle body. After trying for a while i decided to try another day, before frustration takes over and I start taking the big tools to it
Another day another try.