Nonstop bucking no matter what

[arabeclipse]

This morning on my way to school driving on the highway, 5th gear doing 70mph, i went to pass and i hit 10psi of boost. Right when I hit 10 pounds, my car started bucking like a mad horse. My stupid mistake of a narrowband said i was rich as hell, and that led me to think I needed to lean out the maft a bit.

Well I leaned WOT out 10% (two clicks on the translator) and it STILL bucked under boost. I tightened up all my couplers and did a BLT and there were no leaks. Then I thought maybe i had a bad GM MAF. I took it off and recirculated my BOV and used the OE maf.... STILL bucking.

And now it bucks even when I'm not in boost. I'll do a 2000rpm take off and it'll buck there all the way until 2500rpm. After that, I can do a good pull....with or without the GM maft. It pretty much bucks in any gear under or not under boost.

I ruled out just two things. Could be more. Either my knock sensor took a dump on me, or TPS? This car had a TPS issue in the past (last owner..he replaced it).

So bucking, with the addition really bad fuel economy, is really killing me right now. I have med school to pay for .

 

[Metal Health]

What injectors, fuel pump, tuning device do you have? Details in your profile make it easier for us to diagnose your problems. Also where in Detroit?

 

[arabeclipse]

They're not listed because everything else is stock.
Only thing I'm tuning with is the translator (I know, I know.. bad idea.)

And I'm actually in Livonia. Like 20 mins from the D.

 

[c2ypt1c]

When's the last time you changed your plugs/wires? Also, what octane you running?

 

[arabeclipse]

Plugs/wires changed last March 2012. I only use 93 octane.

Update: went to autozone and apparently my CEL was on. I guess one owner removed the bulb. I have a code for P1400 which idr what it is, and I have a bad TPS and IAC (I knew it)..). And it was diagnosed by a dsm owner autozone employee that I have misfire apparently. He determined that by my exhaust sounding like a teleghraph.

I'm gonna change the plugs again to NGK's to see if it solves my apparent misfire. Then I'm gonna scavenge for a TPS at a junkyard and see if that helps the bucking.

 

[arabeclipse]

So I changed my plugs to NGK's and i tuned my base knob 10% richer. the bucking stopped!

And I did another BLT, and I found a leak at the TB shaft on both sides. I have a BBK TB (last owner) so I don't know how to stop the leak at the shaft. Guess that's another adventure to journey across.

Also I still have a misfire. Don't know why. And I know for sure the TPS is bad because I get mad jerking when getting on the throttle.

 

[DSMTyson]

You can send the throttle body out to get rebuilt. There's a couple freelancers on the site that rebuild them.

and you should get rid of that narrowband a/f gauge. Just saying.

 

[arabeclipse]

You can send the throttle body out to get rebuilt. There's a couple freelancers on the site that rebuild them.

and you should get rid of that narrowband a/f gauge. Just saying.

I'll look into those. I'll prob go pick up a 2g TB at a junkyard. I prefer a more firm pedal and the BBK's are really light.

And I know man. I just have it to get by. I learned the hard way not to tune with it.

 

[mmohr423]

Sorry I'm a newb just wondering what TPS stands for? I also have this bucking

 

[GSTurbo1]

throttle position sensor

 

[mmohr423]

Thanks

 

[Miakehl]

See, Mine does this and it's 100% factory from the maf back.

 

[arabeclipse]

See, Mine does this and it's 100% factory from the maf back.

Are you talking about the car jerking or bucking? Either could be caused by a bad TPS. There's threads on this site on how to test for it.