DanaliHD

iTrader: (5)

My truck has been running strange since putting on the ported throttle body. the trans shifts seem all whacky and it keeps nearly stalling when i come to a stop especially if i'm turning the wheel all the way to one side or the other. I adjusted the idle screw so my tuner read 0% tps. What do i need to do to fix this idle issue? I have hptuners. fyi

oh, and i'm seeing these 3 codes. P0172, 0175 bank 1 too rich, bank 2 too rich, and Nd041 unknown error. what the hell is going on?

I'm also having a problem with my boost not going above 6-7lbs with a 10/11lb pulley on it. Steve at whipple says i definately have a backpressure problem due to melting my cats. I think i read somewhere that these codes could be from the cats not working properly. Does any of this make sense? Is it all related? I swapped out the plugs and wires already. they are all gapped right and secure. I will say that while i was changing the plugs, i accidentally let a wrench touch both terminals on the battery. Would that have caused a problem?

The other problem, or maybe it's the same problem, is when i'm in 4th and the tcc locks, the truck feels like it's gonna stall just like it does at idle. Could this all be related to the cats/backpressure problem?

ktmrider

Wow, you got an interesting issue. Did the codes come right after the battery short or the TB? The TPS calibration sounds fishy, do you get a fluctuating signal on the HPT diagnostic?
The codes indicate a rich condition which usually plugs up the cats instead of "melting" them ( lean will fry them ). Most guys with those codes find a sensor disconnected. You might have freaked the PCM, maybe try reloading your last HPT tune and see what happens.

DanaliHD

iTrader: (5)

I started seeing those codes today when i was smart enough to hook up my hptuners. lol. don't know when they actually started. I just went for a drive and realized that it runs basically fine as long as i don't get on it at all. The maf is fine, there is no vacuum leak around the tb or intake, the plugs are seated right as are the wires. I'm wondering if the guts in the cats finally let loose and me changing the tb is just a coincidence

highspeedspecialist

check the vaccume of the engine at 2500 rpm and see if the needles on the vaccume gauge flikers if so they you have a plug system..

DanaliHD

iTrader: (5)

well, the codes are gone. someone told me how to go about adjusting the idle screw properly and it seemed to work. still stumbles a little so i guess i need to adjust it again. Truck still runs like crap and can't get the boost to go up to 11 like it should but i still think it's a blocked exhaust. tearing it apart as soon as the new parts come in the mail.

highspeedspecialist

are you talking about adjusting the screw that move the throttle plate? If so that's a big NO!

DanaliHD

iTrader: (5)

yup, that's exactly what i'm talking about. why is that a big NO?

highspeedspecialist

Because the computer will think your on throttle and the timing will advance with the change of tps voltage.

DanaliHD

iTrader: (5)

today i got a low tps voltage message on hptuners. hmmm, so how do i make sure the new tb is adjusted properly?

highspeedspecialist

Ok key on engine off your tps voltage should read .5v or 10%. To adjust it all you have to do is back off the throttle plate stop screw (or as you would call it idle screw) Then tighen the screw until it just touch the plate barely. You can also shift your tps sensor around alittle bit to fine tweak it to the .5v spec. Remember that screw is nothing more than a throttle plate stop. Idle is control by the IAC idle air control motor and the computer does that. Almost forgot to read the voltage on the tps just get a mulitmeter and backprobe into the signal wire (middle) and the refernce voltage wire.

DanaliHD

iTrader: (5)

using hptuners, i saw 0.61v. that's with the screw turned all the way down, not even touching. still seems stumble at idle

highspeedspecialist

try shifting the tps sensor and see if there's a difference.

highspeedspecialist

Ok after further reasearch you can adjust the throttle plate stop screw but with certain procedures that can be found in a shop manual. Sometimes you have to jump cetain connectors just to make that adjustment. .61 may still be in acceptable depending on your truck. But in the mean time alot of times its just a dirty throttle plate from carbon or the idle air controler need some cleaning too. Use some teflon safe throttle body cleaner.