Thread: not shifting at boost

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?

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

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

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?

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.

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?

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)

Now more probs ):

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

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.

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.

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

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.

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.

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

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?

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.

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

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

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