TPI Harness question
04-10-2021, 04:46 PM
#1
TPI Harness question
Inside my 85 is a jacked up TPI Harness for MAF. There are so many splices in it, it's sicking to look at so, I'll be selling that one cheap on here when I remove it from the car. When I go the replacement 305 motor from a 90-92 F-Body, it came with the MAP TPI Harness. Well, after looking it over last week, I notice that it too has some cut wires. So, it also will be sold on here cheap.
Now, onto my question. The TPI Harness from Painless, I know it says that it is not to be used as a replacement for the original, has anyone used one as a replacement or should I wait and see if someone has a uncut MAP TPI Harness?
Now, onto my question. The TPI Harness from Painless, I know it says that it is not to be used as a replacement for the original, has anyone used one as a replacement or should I wait and see if someone has a uncut MAP TPI Harness?
04-10-2021, 04:56 PM
#2
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Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: TPI Harness question
It "can't" be used as a replacement because it doesn't have all the emissions circuits in it.
If you only have a few cut wires on the "new" 90-92 TPI MAP harness, I would just live with it. If they used regular insulated butt splices, I would cut those out and use some non-insulated butts and put nice adhesive lined heat shrink over those butts. Get some new nylon convoluted tubing or some split loom techflex braid and re-wrap it and call it a job..... done
If you only have a few cut wires on the "new" 90-92 TPI MAP harness, I would just live with it. If they used regular insulated butt splices, I would cut those out and use some non-insulated butts and put nice adhesive lined heat shrink over those butts. Get some new nylon convoluted tubing or some split loom techflex braid and re-wrap it and call it a job..... done
04-10-2021, 05:25 PM
#3
Re: TPI Harness question
Thanks for the reply. So all it is missing is the emissions related wires, that's good because all of the emissions related parts are removed except for the O2 sensor. And maybe the MAP I'll keep.
But I get what you are saying about my harness. Since the harness was not connected to the engine when I got it, I can't tell what's missing or what it was supposed to hook up to.
But I get what you are saying about my harness. Since the harness was not connected to the engine when I got it, I can't tell what's missing or what it was supposed to hook up to.
It "can't" be used as a replacement because it doesn't have all the emissions circuits in it.
If you only have a few cut wires on the "new" 90-92 TPI MAP harness, I would just live with it. If they used regular insulated butt splices, I would cut those out and use some non-insulated butts and put nice adhesive lined heat shrink over those butts. Get some new nylon convoluted tubing or some split loom techflex braid and re-wrap it and call it a job..... done
If you only have a few cut wires on the "new" 90-92 TPI MAP harness, I would just live with it. If they used regular insulated butt splices, I would cut those out and use some non-insulated butts and put nice adhesive lined heat shrink over those butts. Get some new nylon convoluted tubing or some split loom techflex braid and re-wrap it and call it a job..... done
04-11-2021, 09:50 AM
#5
Re: TPI Harness question
The third photo exemplifies the years of patchwork that the poor thing has suffered. That added-in fuse holder is not stock. It also appears that during its life someone had replaced several connectors, and again used crimp butt splices. I'll bet a cup of coffee that many of those connections are now resistive, and probably were already getting that way within a few months of them being installed.
Someone needs to put away the Sta-Kon pliers and whip out the solder gun.
The harness could be removed, and a new (replacement) harness laid out and connected in its place. all the convoluted tubing and excess wire (which Painless harnesses do have) will need to be addressed. If you're going to pull a harness to replace it, it might be just as easy to replace the failing connectors and butchered wires, then re-install the original. You would spend time sourcing the connnectors and wire, or you can buy a used/original replacement and would potentially have some of the same issues.
Someone needs to put away the Sta-Kon pliers and whip out the solder gun.
The harness could be removed, and a new (replacement) harness laid out and connected in its place. all the convoluted tubing and excess wire (which Painless harnesses do have) will need to be addressed. If you're going to pull a harness to replace it, it might be just as easy to replace the failing connectors and butchered wires, then re-install the original. You would spend time sourcing the connnectors and wire, or you can buy a used/original replacement and would potentially have some of the same issues.
04-11-2021, 09:57 AM
#6
Re: TPI Harness question
Thanks for the reply. So all it is missing is the emissions related wires, that's good because all of the emissions related parts are removed except for the O2 sensor. And maybe the MAP I'll keep.
But I get what you are saying about my harness. Since the harness was not connected to the engine when I got it, I can't tell what's missing or what it was supposed to hook up to.
But I get what you are saying about my harness. Since the harness was not connected to the engine when I got it, I can't tell what's missing or what it was supposed to hook up to.
04-11-2021, 10:07 AM
#7
Re: TPI Harness question
That's why I am in the process of laying my hands on a uncut harness already. I figure when I remove the original MAF harness, I'll sell it with the MAP harness and the next owner can take the time to do something I don't want to do. I was never any good at having a steady hand.
The third photo exemplifies the years of patchwork that the poor thing has suffered. That added-in fuse holder is not stock. It also appears that during its life someone had replaced several connectors, and again used crimp butt splices. I'll bet a cup of coffee that many of those connections are now resistive, and probably were already getting that way within a few months of them being installed.
Someone needs to put away the Sta-Kon pliers and whip out the solder gun.
The harness could be removed, and a new (replacement) harness laid out and connected in its place. all the convoluted tubing and excess wire (which Painless harnesses do have) will need to be addressed. If you're going to pull a harness to replace it, it might be just as easy to replace the failing connectors and butchered wires, then re-install the original. You would spend time sourcing the connnectors and wire, or you can buy a used/original replacement and would potentially have some of the same issues.
Someone needs to put away the Sta-Kon pliers and whip out the solder gun.
The harness could be removed, and a new (replacement) harness laid out and connected in its place. all the convoluted tubing and excess wire (which Painless harnesses do have) will need to be addressed. If you're going to pull a harness to replace it, it might be just as easy to replace the failing connectors and butchered wires, then re-install the original. You would spend time sourcing the connnectors and wire, or you can buy a used/original replacement and would potentially have some of the same issues.
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04-11-2021, 10:08 AM
#8
Re: TPI Harness question
And I know that, I was just talking about the emissions.
If you are converting to Speed-Density you will need a LOT more than the O² and MAP sensor. Just to run, it will need a TPS, the IAC connection, CTS, IAT, detonation sensor, the EST will need to be changed, and the speedo VSS connection will need to be addressed, along with its buffer. The distributor is different as well. Also keep in mind tht ALL the connectors are going to be a different style WeatherPak since they changes around 1987. That includes the interacting body connnectors. And then you will need a new ECM and programming.
04-11-2021, 08:29 PM
#10
Re: TPI Harness question
I'm getting a DynamicEFI so I need the 90-92 harness. I'll be able to dial in the TPiS once I get the Stroker Kit and build the engine. If I did what you have suggested, I would be buying two harnesses. But, thanks to you and the others that chimed in, I'll be saving $300 by not getting a Painless Harness. Besides, I already have a 165, 730, 746 & what ever ECM is under the dash in my 85. Which those will go up for sale once I get the DynamicEFI.
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