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Originally Posted by Phillie Phanatic
As expected, MFTS was fubar.
More wack ass splices.
Apparently very common, actually.
Will need some more of these.
I also need a 30mm or 31mm socket as the imperial sockets I have are one size too small and one size too large for the MFTS fitting, lol.
This article is incredible and has walked me through diagnosing this: https://forums.quattroworld.com/s4s6/msgs/22584.phtml
It is incredible hard to get to, as the MFTS it is under the intake manifold. I almost want to just replace all the sensors while I am down there, but meh, we'll do one at a time for now.
I also found out that the oil pressure sender is not hooked up at all. Fantastich!
Also, I drained out all the coolant and ran a few 10 gallons of water through it and pressurized the system with an air hose. I am pretty sure there was probably a blockage in there or something based on how long it sat.
The oil drain is a fumoto drain plug, which everyone must try. It's so fantastic.
Awesome car man! I've always wanted an avant. Currently have a 93 S4 which has a similar setup to yours (3071r, big brakes, coilovers, ls2 coilpacks, etc.)
I am currently changing mine up and kinda going overboard on a few things. Rewired the entire thing & added an ATL fuel cell, MaxxECU, bucket seats...never ending project.
Anyways, keep it up! They are really fun cars when sorted out. Chasing misfires is a pretty regular occurrence. Make sure all the coils/sparkplugs are good, check for boost leaks, etc. Also voltage regulator on the alt.
I am going for more of a comfortable cruiser/weekend car. Funnily enough, I originally purchased this as a daily driver for winter. What was I thinking?
I just replaced the sparkplugs, but it probably should get some new plug wires. Since you have the LS2 coils, would you mind confirming the plug order for me? I am pretty sure there will be a boost leak or two, but the biggest issue right now is probably the air box that is missing two retaining clips, so it is open on one side.
What do you mean about the voltage regulator? Common to go bad? I've noticed the electrical system on this thing is fantastic, despite all the **** that has been wired/spliced into it in the past. I left the doors open for 2 weeks and the car started right up!
I had a bunch of trouble like that with the MFTS in my 2B 200 20V wagon. After sorting out all the electrics I think I realized there was some flaw in the intake manifold surface preventing the sensor from sealing correctly, so who knows how long the car had been dripping coolant down into the electrical connector (and boot) before I'd owned it. What a pain that was.
Last edited by turbo_nine; 06-23-2020 at 04:15 PM.
call it potatography
Here's some pics (older -> newer)
lots of wiring pulled
still a wip but it's getting there