96 z A4,Ive had a holley tb for a while now so i decided to install it 2 day. i done the tb bypass and hooked every thing up exactly how it was and when i started my car the Check Engine Light was on so i took it down the road and WTF it wouldnt shift untill 3krpms in every gear so i went to advance and they scanned it and it came up throttle position sensor and maf so WTF. I went a head and bought a throttle position sensor i dont think there is any thing wrong with the MAF because i was really careful. Please help guys

 

Thats because you didn't get it tuned for the new throttle body since you have an A4 Might as well take it off till you get it tuned for it, otherwise you can kiss your transmission buh-bye! (not right away, but relatively soon)

 

lmfao

 

What the heck r u talking about? Is this an A4 thing as I have never heard of issues with a M6? Why would more air flow cause a problem with the shifting of the A4? Just curious.

 

I'm gonna have to disagree with ya on this one because I have ran 2 different T.B's on my A4 (52mm and a 58mm) w/o a tune with no issues and no codes being thrown. Something else must be acting up w/ his set up.

 

This sounds to me like a simple TPS issue. We have found you need to slot them and adjust them at times.

 

Happened to me too, with my 58mm Holley. Slotted mine, adjusted..never touched it since.

 

Yes, it is. The computer controlled A4s (93 excempt, or trans swapped cars) are controlled by throttle position. Bigger TB = more air thus less throttle %. More air at less throttle is translating into more power with less line pressure. The less line pressure shifts earlier and with more power it makes the slip (under part throttle, Autos basically are slipping into gear, but that's the intent, for a smooth shift) worse. Continual use of that unregulated slip will eventually take out the trans. So the tune corrects this by adjusting something to compensate for the lack of throttle, and also bumps up line pressure.

I however won't rule out that some of it could be due to either TPS misadjustment, misinstalled or just plain bad TPS. I think the common sign of what I was referring to is too early a shift under WOT.

 

ive already installed the old back on it and its doing the same thing. I have a new tps im gonna try tomorrow. How do i notch it ? Thanks guys

 

Take a drill bit the same size as the bolt holes and oblong them out so the TPS is "adjustable" Unless they're talking about something else, then I dunno heh

When you get the new TPS on, and if you put on the TB again, see if it shifts earlier than 5800rpm (5700 would be fine).

 

i dont know im gonna try it tomarrow and see what happens

 

adjust your tps to .67 volts at w.o.t and slot the tps to get that voltage all you need to do is tap into ur tps with a voltmeter

 

i called f body motor sports in Charlotte and they said i didnt need a tune to install a tb. I have installed this tb on my 93 with no problems at all. Anyway the old one is back on and it still acting up. This Freaking BLOWS

 

That's because '93 autos are not computer controlled.

 

I agree that you need a new tune after a throttle body swap. I put a 52 mm on mine, and it would hit the rev limiter for a second before it would shift. My tuner said he needed to update the tune for it, so I went out to him and he made a simple adjustment.

I don't think this is your problem however. Did you get that new tps on yet? Have you checked tps voltage at idle and WOT? I know it's kinda difficult, but a sweeping voltage check from idle to WOT is also a good idea. the voltage will bounce around, but you should be able to see any spikes in voltage.

 

he is right. i have a friend that had a 94 a4 with a bbk 52 mm and had no such problems.

sounds like there may be a vacum leak. or some sort of hose is not fully connected. if the maf is broken the car shouldnt run.... at least that is what happened to me

 

My 94 Z28 camaro did this exact thing the other day when I was racing my buddies 01 Lightning! I had just installed the 58mm TB an my car wouldn't shift correctly and the service engine light came on. I got the code read and it stated that my TPS is reading high and that my left 02 sensor was lean. Doesn't make since to me either but talking with a trans builder the TPS sensor could cause the shifting issues considering it's all the electronic bull crap that goes hand in hand with motor and auto trans. The day after my car was acting up I started it up and took it for a spin and it drove just fine. I suggest getting it tuned as well. I will be by Ion at mad Z28 when I drive home to Illinois in a few weeks.

Oh I have no clue about slotting the TPS so if some one want's to explain how this is done and what this will help I would love to hear!!!

 

from what i gather there talking about cutting the holes with a drill or sumthing and making it to where you can adjust and tighten the screws back. idk thats why i just bout a new one but dont have the stuff to put it on with here at my gf

 

The stock TPS is not adjustable, it only has two round holes that bolt it to the TB. What you sometimes have to do is make the holes into slots so that the TPS can be turned to get the correct voltage at idle and WOT. You do this by using a drill bit and cutting away the plastic.

 

Interesting...didn't know that, thanks.