not shifting at boost

[GrandPrixgtp2000]

Ok When i have more than 2 bars on digital boost thing my car wont shift idk what it is? Any body have an idea?

[Slick2500]

So if you go WOT it doesnt shift? Does the car shift under normal conditions?

[GrandPrixgtp2000]

Yeah the car shifts if im not boosting at all if it has more than 2 bars then it hesitates to go but then It will go and not shift untill i let off the gas

[Slick2500]

What happens if you try to go WOT? Does it fall on its face? How long has it been since you did a tune up ie plugs wires fuel filter?

[GrandPrixgtp2000]

From stop if I go WOT it will hesitate then start to go normal (still full boost) then if i keep going (full boost) it wont shift then i have to take my foot off the gas. About a week ago i did intake gaskets, then changed my oil, and i did plugs, wires, and coilpacks about 4 months ago. Have not done fuel filter yet.

[BillBoost37]

Let me reiterate to ensure I have this correct.

If you are doing 30mph and go 50% throttle, it won't upshift at any point. Does it bounce off the limiter?

[GrandPrixgtp2000]

that is true, and yes it does bounce of the limiter, then i feel it up shift after i let off the gas then go again (with out boost)

[GrandPrixgtp2000]

Now more probs ):

[BillBoost37]

Please...elaborate. I'm thinking you might be getting slippage at less than wot, but would like to hear more.

[GrandPrixgtp2000]

Well I think about 90% of the problem is fixed i had a lean gas code pop up yesterday and thismorning i bent the #85 tap on my fuel speep relay and it seams to be running good i just took it out it still has a bit of hesitiation on shifting while in boost.

[BillBoost37]

P0171 Lean Bank One isn't going to effect shifting unless you have other things going on. Like a fuel pump dying, TPS/MAF issue etc etc. By itself though.. 171 won't effect shifting.

[GrandPrixgtp2000]

Well I bent that tap have put new intake gaskets new MAF new MAP, I have not put a new tps in yet.

[blueguy]

Dirty IAC/MAf will cause skewed shifts.

Sounds like you got a vacuum leak to me if you tripped a a P0171.

Especially if you just did the LIM gaskets, did you replace all the rubber "T" fittings?

Check the MAP sensor on the back of the blower...there should be a port where a "L" rubber fitting goes into the bottom of the MAP that lots of people tend to miss.

[GrandPrixgtp2000]

Whats the IAC, and I just got a new MAF, if you are talking about all the T fittings for the vac lines no i did not change all of those, and the MAP sensor is new too and i have my vac line on that as well.

[torq455]

Weird prob. Maybe disconnect the battery for a while? See what happens?

[GrandPrixgtp2000]

I think i might have found the problem i checked my vac lines for the 50th time and one of my T fittings the one right under the supercharger and it was cracked all to hell! Do we feel that might be the problem?

[SlowNA06]

Bad Rubber T will cause the P0171. That might result in some fluctuating RPMs at 60mph (like +-500), but won't make you bounce off the rev limiter.

[GrandPrixgtp2000]

would it be a vac problem? I dont know what else it would be

[SlowNA06]

Just replace the rubber T (or ziptie it together) and see if the P0171 goes away.

[GrandPrixgtp2000]

Im getting new rubber ts in the morning and then i will check that to see if it goes away.