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MVB Samba Member
Joined: June 21, 2023 Posts: 58 Location: Sydney, Australia
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Posted: Sat Jul 22, 2023 6:05 am Post subject: Re: Fuel injection relief here! |
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Actually they’re aerobatic compatible so with the right manifolding one could have one on its side. Meaning one can do it with just one afterall |
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rosevillain Samba Member
Joined: December 28, 2005 Posts: 1290 Location: roseville, ca
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Posted: Mon Sep 11, 2023 8:14 pm Post subject: Re: Fuel injection relief here! |
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Been a while. If I unplug the temp sensor at the AAR, the car seems (haven't driven it, only vroomvroom noises in the driveway) to run well. Connected, the car doesn't respond well to idle adjustments, and doesn't rev. Fuel pressure is set to 28psi and timing is at 5BTDC. Of course I haven't ohmed it. Time to source one? '68 manual |
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jasle Samba Member
Joined: July 08, 2008 Posts: 149 Location: Austin Texas
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Posted: Fri Sep 29, 2023 1:19 pm Post subject: Re: Fuel injection relief here! |
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Wondering if anyone knows the color of the wire 19 to connection 85 on the pump relay? I'm currently missing this wire. Have a few wires under the dash disconnected. Looks like a ground from ECU
_________________ Jason in Austin Texas
69 Notch Auto FI
Seagul Blue |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34023 Location: Conejo Valley, CA
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Posted: Fri Sep 29, 2023 2:13 pm Post subject: Re: Fuel injection relief here! |
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It is a white wire, and that T1 connector is in the engine bay, left side, forward of the left intake tubes.
This is an aftermarket crimp on connector, but the clear plastic VW connector goes here also.
Last edited by KTPhil on Fri Sep 29, 2023 2:19 pm; edited 1 time in total |
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jasle Samba Member
Joined: July 08, 2008 Posts: 149 Location: Austin Texas
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Posted: Fri Sep 29, 2023 2:18 pm Post subject: Re: Fuel injection relief here! |
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KTPhil wrote: |
It is a white wire, and that T1 connector is in the engine bay, left side, forward of the left intake tubes. |
Thx. Found it. Someone spliced in a blue wire. That fixed the fuel pump not coming on. Starts, runs fairly well with 2 caveats.
Lopes like cammed when cold
Super rich. Black soot on bumper and black smoke. _________________ Jason in Austin Texas
69 Notch Auto FI
Seagul Blue |
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jasle Samba Member
Joined: July 08, 2008 Posts: 149 Location: Austin Texas
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Posted: Fri Sep 29, 2023 2:21 pm Post subject: Re: Fuel injection relief here! |
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KTPhil wrote: |
It is a white wire, and that T1 connector is in the engine bay, left side, forward of the left intake tubes. |
Thx. Found it. Someone spliced in a blue wire. That fixed the fuel pump not coming on. Starts, runs fairly well with 2 caveats.
Lopes like cammed when cold
Super rich. Black soot on bumper and black smoke. _________________ Jason in Austin Texas
69 Notch Auto FI
Seagul Blue |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34023 Location: Conejo Valley, CA
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Posted: Fri Sep 29, 2023 2:27 pm Post subject: Re: Fuel injection relief here! |
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jasle wrote: |
KTPhil wrote: |
It is a white wire, and that T1 connector is in the engine bay, left side, forward of the left intake tubes. |
Thx. Found it. Someone spliced in a blue wire. That fixed the fuel pump not coming on. Starts, runs fairly well with 2 caveats.
Lopes like cammed when cold
Super rich. Black soot on bumper and black smoke. |
Vacuum leaks often cause these symptoms.
Check hose from plenum (IAD) to pressure sensor (MPS, under left side of engine bay floor).
Then a systematic check of all hoses for vacuum leaks. |
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jasle Samba Member
Joined: July 08, 2008 Posts: 149 Location: Austin Texas
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Posted: Fri Sep 29, 2023 3:15 pm Post subject: Re: Fuel injection relief here! |
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KTPhil wrote: |
jasle wrote: |
KTPhil wrote: |
It is a white wire, and that T1 connector is in the engine bay, left side, forward of the left intake tubes. |
Thx. Found it. Someone spliced in a blue wire. That fixed the fuel pump not coming on. Starts, runs fairly well with 2 caveats.
Lopes like cammed when cold
Super rich. Black soot on bumper and black smoke. |
Vacuum leaks often cause these symptoms.
Check hose from plenum (IAD) to pressure sensor (MPS, under left side of engine bay floor).
Then a systematic check of all hoses for vacuum leaks. |
Yup, that was it. Many Thanks! _________________ Jason in Austin Texas
69 Notch Auto FI
Seagul Blue |
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MARTYB Samba Member
Joined: March 26, 2023 Posts: 8 Location: AUSTRALIA
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Posted: Sun Feb 11, 2024 3:39 pm Post subject: MPS Wiring Question |
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Hello Members
I own a 1972 Fastback TLE with the original fuel injection system.
The MPS fitted on my car has an additional wire connected to a single male terminal at the rear of this part and it then goes into the fuel injection wiring harness.
Is this an earth or ground wire ?
I have a better condition spare FI wiring harness i would like to install , however it is not fitted with this wire mentioned above
Thanks for any help provided |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34023 Location: Conejo Valley, CA
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Posted: Sun Feb 11, 2024 6:49 pm Post subject: Re: Fuel injection relief here! |
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A photo would help a lot. MPS part number as well.
VW did add some ground wires in later FI cars. |
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FastyOrange Samba Member
Joined: November 15, 2012 Posts: 111 Location: Greenville, SC
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Posted: Sun Feb 11, 2024 9:24 pm Post subject: Re: Fuel injection relief here! |
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That single wire on your mps is a ground. The other end is either all by itself at the engine case center line or with the other grounds at the base of the oil breather (I can't remember which off of the top of my head).
Jon _________________ 72 FI Fastback
70 FI Fastback (Parts Car) |
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MARTYB Samba Member
Joined: March 26, 2023 Posts: 8 Location: AUSTRALIA
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Posted: Tue Feb 13, 2024 2:30 pm Post subject: Re: Fuel injection relief here! |
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Thanks to the members for the info provided |
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jessehattabaugh Samba Member
Joined: July 10, 2023 Posts: 4 Location: Pacific Northwest
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Posted: Wed Mar 20, 2024 4:40 pm Post subject: ECU fuel pump bypass |
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I'm trying to get a 1970 Squareback running, and I've determined that the ECU is not sending ground to the fuel pump relay when the key is turned on. I tested the #19 wire directly at the ECU. It is sending 8v positive instead. The original owners had bypassed the fuel pump relay with a wire directly from the fuseblock to the pump.
Should I:
1) buy a replacement ECU
2) open it up and test the components and solder on replacements
3) just leave the fuel pump relay bypass in place and see if the rest of the ECU still works |
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Tram Samba Socialist
Joined: May 02, 2003 Posts: 22729 Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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Posted: Wed Mar 20, 2024 7:23 pm Post subject: Re: ECU fuel pump bypass |
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jessehattabaugh wrote: |
I'm trying to get a 1970 Squareback running, and I've determined that the ECU is not sending ground to the fuel pump relay when the key is turned on. I tested the #19 wire directly at the ECU. It is sending 8v positive instead. The original owners had bypassed the fuel pump relay with a wire directly from the fuseblock to the pump.
Should I:
1) buy a replacement ECU
2) open it up and test the components and solder on replacements
3) just leave the fuel pump relay bypass in place and see if the rest of the ECU still works |
That's more and more of a common issue these days. Ground the pump relay wire to the body and see if she fires up. _________________ Немає виправдання для війни! Я з Україною.
Bryan67 wrote: |
Just my hands. And a little lube. No tools. |
To best contact me, please use the EMAIL function in my profile |
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jessehattabaugh Samba Member
Joined: July 10, 2023 Posts: 4 Location: Pacific Northwest
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Posted: Thu Mar 21, 2024 9:02 pm Post subject: Re: ECU fuel pump bypass |
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Tram wrote: |
That's more and more of a common issue these days. |
I've seen a few other mentions of it. I wonder if there's any information about which transistors I need to check, and what kind to replace with. |
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Tram Samba Socialist
Joined: May 02, 2003 Posts: 22729 Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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Posted: Thu Mar 21, 2024 9:28 pm Post subject: Re: ECU fuel pump bypass |
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jessehattabaugh wrote: |
Tram wrote: |
That's more and more of a common issue these days. |
I've seen a few other mentions of it. I wonder if there's any information about which transistors I need to check, and what kind to replace with. |
You could always just gently open the box and see what fried. Sometimes it's as simple as re-flowing a solder joint. Sent you a PM back. _________________ Немає виправдання для війни! Я з Україною.
Bryan67 wrote: |
Just my hands. And a little lube. No tools. |
To best contact me, please use the EMAIL function in my profile |
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