Driving Issues

wyldnwoody44 · #1 08-08-2011, 06:11 PM

Hey Guys,

I have been having an ongoing problem for quite some time, its kinda tricky so ill try to be as elaborate as possible.

I put the quick change in a year or two ago and although it worked it made my car shift funky especially at higway speeds so I took it out and rewired the plug back to normal.

Since that time I have had issues with my car running right; the car wants to jump a gear and rev out; dependant on where my TPS is set. Ive been messing around with it for years; when my TPS is set normal the car shifts fine until around highway speeds; then around 65-80 MPH the car just starts reving out until I tap the brake. If I set the TPS different (Put it almost all the way down) the car drives well at highway speeds but It doesnt shift right while driving in the city it misses a gear at times and doesnt want to shift smooth.

I had issues with the car starting after a vacum leak as well; however, after one long drive of the car revving at highway speeds, that problem resolved.

IDK what to look for; I pulled engine codes and I believe it read temp coolant sensor, O2 sensor and TPS; but when I corrected the TPS those codes went away.

Does anyone have any clue whats going on; its so frustruating that Im debating selling the car and getting a legacy; I dont want to, but this is very hard to put up with.

any help appreciated

icingdeath88 · #2 08-08-2011, 06:20 PM

Coolant temp sensor (CTS) is frequently associated with starting problems, and fairly easy to replace.

For the TPS, if it just can't be adjusted to work normally, then you should try a new one altogether (or a known good used one). I would also suspect the wiring where the QC was. I imagine that if the TPS wiring is messed up just right, it could have some symptoms like a bad TPS.

svxfiles · #3 08-08-2011, 07:00 PM

What voltage are you reading at the white wire?
It should be 0.48V.
Subaru says between 0.45-0.55.

wyldnwoody44 · #4 08-08-2011, 09:29 PM

Quote:

Originally Posted by svxfiles

What voltage are you reading at the white wire?
It should be 0.48V.
Subaru says between 0.45-0.55.

I haven't measured it, I don't have the tools. Im just playing with it and seeing th symptoms. Right now I have it in the factory position where it was marked and it all drives fine except for when im doing 30-45 mph then just s slight tap of the gas causes a quick shift, not normal, I've checked the wiring many times, that was my first thought

svxfiles · #5 08-08-2011, 09:58 PM

Please buy a digital voltmeter/multimeter.
At no more than $20.00 for a cheap one you can save your transmission.

icingdeath88 · #6 08-08-2011, 10:05 PM

It you're not measuring the voltage, you're doing it wrong. A multimeter is seriously like $15 at walmart man. Harbor freight has them for even less actually: http://www.harborfreight.com/catalog...t?q=multimeter

What you can do is stick pins in the wires, and then attach the multimeter clips to the pins to measure the voltage. When you pull out the pins the wire and sheathing should be fine.

Good call on looking at the QC wiring too. You wrapped it up good too right?

When I did the 6-speed swap to my (late) white car, I ended up with a bunch of electrical tape where the QC had been.

kwren · #7 08-09-2011, 01:24 AM

Quote:

Originally Posted by icingdeath88

What you can do is stick pins in the wires, and then attach the multimeter clips to the pins to measure the voltage. When you pull out the pins the wire and sheathing should be fine.

Caution... careful not to let the pins touch each other or touch ground potential against anything...

Keith

longassname · #8 08-09-2011, 04:27 PM

I see in your signature that you have a 4.44 gear ratio; do you have an ECUtune 4.44 TCU?

With the stock TCU and a 4.44 gear ratio the speed calculated from your vehicle speed sensor 1 reading is off. That speed is one of the major things used in all kinds of calculations in the TCU firmware so when it's wrong you can expect the performance and behavior of your transmisison to be significantly degraded.

I can't promise you an ECUtune 4.44 TCU will fix all your transmission problems but it will certainly go a long way towards it and very well could be all you need.

If you have a laptop with windows and a USB port you can use the ECUtuner interface and free ECUtuner software to adjust your tps easily and exactly without poking holes in your wiring harness.

wyldnwoody44 · #9 08-10-2011, 10:00 AM

I checked the voltage and its where it needs to be at the tps, I don't have a 4.44 Tcu, the tranny was fine until I messed with the Qc, I ended up taking a new harness out and having to rewire it....I've checked tho, they are all wire butted and taped in position. Its a pain to get to under the dash, i don't know much about electrical and this tranny thing is kinda outta the realm of most local mechanics around here.

longassname · #10 08-10-2011, 10:11 AM

Ya, it sucks to have cut factory wires. Once you cut them it's a big hassle just to get back to what you had before you cut them. I didn't quite follow what you were describing you did with your harness now. Are you confident your wiring is good now?

A lot of people think their 4.44 conversion is fine without modifying the TCU--until they try it with the modified TCU. I suggest finding some people with 4.44 TCUs and asking them.

wyldnwoody44 · #11 08-10-2011, 10:53 AM

Quote:

Originally Posted by longassname

Ya, it sucks to have cut factory wires. Once you cut them it's a big hassle just to get back to what you had before you cut them. I didn't quite follow what you were describing you did with your harness now. Are you confident your wiring is good now?

A lot of people think their 4.44 conversion is fine without modifying the TCU--until they try it with the modified TCU. I suggest finding some people with 4.44 TCUs and asking them.

Yes to make the long story short, while messing around under the dash I wrecked the harness. I got another one and wired it all up, it took forever on my back lol. The car was fine until I put the qc in, that's when the problems started. I took the qc out and put the new harness in and haven't had the car normal since

longassname · #12 08-10-2011, 11:00 AM

Is it a complete new harness or part of a harness butt connected in?

wyldnwoody44 · #13 08-10-2011, 11:25 AM

Quote:

Originally Posted by longassname

Is it a complete new harness or part of a harness butt connected in?

It was cut out of an svx at my mechanics, then I re wired it and plugged it into the correct spot

Huskymaniac · #14 08-10-2011, 11:53 AM

Quote:

Originally Posted by wyldnwoody44

Yes to make the long story short, while messing around under the dash I wrecked the harness. I got another one and wired it all up, it took forever on my back lol. The car was fine until I put the qc in, that's when the problems started. I took the qc out and put the new harness in and haven't had the car normal since

Did the problems start when the QC was still in or did they start after the QC was taken out?

wyldnwoody44 · #15 08-10-2011, 03:51 PM

Quote:

Originally Posted by Huskymaniac

Did the problems start when the QC was still in or did they start after the QC was taken out?

While th qc was in, hasn't been normal ever since