i have a weird problem
 

OK guys,here is the crazy problem that i have.for the most part my 87 gn is mostly stock with miner bolt ons.just this week end my cam sensor and maf sensor went out so i ended up replacing both the same day.after installing the sensor i went for a test drive to make sure that everything was ok.BUT ended up finding a other problem.HOW can i explain it,lets try this
turbo t49 new
watsegate new
hoses and clamps new
boost line new
wastegate solenoid new
gn has 36,000 plus miles on it
when going into wot my boost gauge reads that i am at 21 psi which i have it always set at 17psi at the same time that im in wot my gn feels like theirs no turbo in the car, doest move hard at all,very very very slow.it feels like the turbo isnt kicking in .i can hear the turbo spinning and making a very loud noise like air or something but thats when im into the gas.i check all the hoses and they appear to be good my gauge shows that i have vacuum too

once again gn boost to 21psi but moves slow like if their wasnt a turbo in the car

Youch... now thats interesting..... I think we need to know some timetables... like was it running fine before installing the turbo and other upgrades, did you do anything just before the problems started... you can't be at 21lbs of boost and in vacumn at the same time...

Hey jack,all the small upgrades have been done over the past 5 years or so,the car has always ran perfect in every way possible,drives like its new
just 21 years old.the only reason that i ended up replacing the turbo on the car was due to the old one was leaking oil into the intercooler and exhuast system.the turbo was replace with the other parts that i had mention above about a month & 1/2 ago. the car ran perfect till friday night thats when the cam sensor went out on me.all work was done by my mechanic which has worked on a hand full of gn's and syclones in the pass.I was told that it could be my toque converter that can cause this to happen.
my gn is usually use to go to car show.i normally just cruise the car not running it hard

It sounds like your TC lock up solenoid is not allowing your clutch to unlock. Check the wiring and solenoid for proper operation. Does you GN stutter at all?

no stuttering at all, when driving normal its ok just in wot.I did have the tcc solenoid replace last year.

Hey Brianhynes,after thinking about what you mention you may have a point here with the tcc solinoid. Im going to try and due my home work on this to see if this is the problem or not THANKS FOR THE INPUT

Are you sure you set the cam sensor correctly...

That was going to be my question. You beat me to it.
Try starting the car and then unlugging the cam sensor, and see if it runs any better. In case you don't know, you can run the car without the cam sensor. It will throw a code and the SES light will be on, but it should run fine, even better if it isn't adjusted properly. BUT, if it stalls, you can't restart it until you plug it back in.

What kind of MAF. Are you sure that one is good? Is it a stocker?

Is the MAF good ? Maybe the calibration is out to lunch @ WOT. I would start the car disconnect the cam sensor (While running) and take it for another run. If you shut the car off you will need to plug the cam sensor back in to restart.

i think i set the cam sensor right this is the second time it has gone out on me in a couple of years.And yes im using the casper cam tool to set it.i am using the original ac delco maf sensor that came with the car as a spare.it is a new part not used.
i also used a volt meter to check to make sure it was set properly.start out at 7 volt turn it alittle then volt meter reads 0.Some time tonight im going to start her up and disconnect to cam sensor to see what happens,and take her for a spin

Stop repeating me!

the only scan tool that im using is an old otc 2000 scanner that belongs to me
thats how i found out the maf sensor went out on me.all codes where cleared the other day when i install both sensor and todays it show no code

LOL Brian I saw you were online the same time I was posting ....
Be Nice I got older today !

OK,unpluged the cam sensor after starting car, ran it hard for about 6 seconds and found no difference.Also tried to burn rubber out of the hole and no luck:mad:
was at 12 psi out of the hole.Normally with these tire all i need is about 3&4 psi and im smoking the tires real bad out of the hole

Good rule of thumb : The wires on the cam sensor cap should be facing toward the drivers side fender. If its facing the other way its 180 out
Check to see if your coolant temp sensor is plugged in (infront of the intake manifold) as well

just check it out and its plug in. got some # that my scanner record in the garage running for 20 minute or so

1]-rpm 1000
2]coolant temp/injpls width -081
3]prom id- 41
4]o2 volts-0820153
7]egr-00
8]rpm/tps-10000.46
10]rpm/vehicle speed-1000
15]coolant temp/iac-083036
52]knock sig/sparl advance-36
51]spark advance-4036
21] o2 cross counts-153
41] tps/throttle angle0.46
48]map/spark advance-36
49]rmp/spark advance-100036
46]coolant tem/mat-86066
also mode 17 read 1025

Sounds very strange....

strange in what way

From what you have given us for Info.
R&R cam sensor & MAF
Car seems to be boosting higher but is doggish.
Did you drive the car with the cam sensor unplugged ? It sounds like you garage tested it but didnt put it in the street.
The higher boost level would send me looking for bad vac lines/leak. It would be alot worse than 21psi
A shot in the dark here.... Maybe inspect the turbo check for excessive play or a banged up wheel

ok guy,this is what has been done by my mechanic from the last post i did.he had reset cam sensor per instruction jack has givin on this forum.did checked spark and fuel and looks good i also have a fuel gauge on fuel rail.which shows
im getting fuel.also when hammering the gas pedal i notice that my boost is going back to 18 psi which is where i had it set before,for some reason the overboosting problem isnt there anymore:D which make me happy,but still the car feels slow and noticing some back fire when i get on and off the gas. CAR IS VERY SLUGGISH OUT OF THE HOLE.ALSO IT APPEAR THAT MY NEW T49 TURBO IS STARTING TO LEAK OIL IN THE EXHUAST SYSTEM.What else can i due to fix this problem with the back firing,And yes we disconnect the cam sensor after starting the car and went for a 30 minute ride and appears to be the same

if it's popping, do you have a cam lobe going bad? Turbo smoking, maybe cam lobe bad, metal floating through the oil and takes out the turbo....

It sounds like its time for a Dr Appointment. New turbo or not seals sound like theyre Gone... Jack hit it on the head IF the cam lobe is wiped. The contaminated oil will make short work of the seals/bearing on the turbo
The reason why Brian and I told you to run it with the cam sensor unplugged was to eliminate it from your existing problem. Maybe you can find someone to loan you a proven MAF. Sometimes the new aftermarket mafs do not perform like the GM units did
Btw Its not guy its Mike...

By What You Guys Are Saying Its Time For A Real Gn Mechanic To Look At My Gn To Fix The Problem.only Problem That Im Going To Have Is Finding One Here In Chicago.a Couple Of Years Back We Had Ans Performance That Pretty Much Was The Mid West Guy To Go Too.
Hey Guys,just Want To Thank You Guys For All The Great Infor
And Willing To Help Out Ones From Far Aways:d

If It Becomes A Wipe Lobe What Due You Guys Think This Would Cost
$3000,$4000 Or More

There's got to be someone who could help you out there. Setting cam sensors can be a pain. Im curious how did you determine the cam sensor went bad ? To be honest it doesnt sound right in a 36,000 mile car.
What did you replace the maf with ? I think Jack would agree, most over the counter mafs are... um ok, not great. Sad thing is they arent cheap.
A bad coilpack/control module could also cause a poping issue. I would see if there is another GN owner out your way. Most GN guys are willing to help out. Maybe they will let you do some part swapping.

coilpack,module,cam,crank,maf, map and every other sensor that i installed in the car is all oem part not reman parts. for the most part i have double of all sensor that the original owner gave me and some hard to find parts.for some reason i new that my cam sensor went bad just by the way it wanted to start.i had the coilpack,crank,fuel ect tested and that how i found that the cam was out.believe me my gn is 1000% rust free and looks like it came off the assembly line from the plant in Pontiac Michigan where it was born:D

As far as finding gn mechanic here im out of luck,a lot of great people here willing to help but not engine builders just good handy man that learn how to work on their gn.I spoke to casper electronics and asked him if he new anyone in chicagoland area.John from casper is about 30 minutes drive from me. he told me he had no one that he new that can due the work here in chicago.i believe his motor was build from a guy in florida not local
My gn is used just for cruise spots and car shows not racing her down the track.

Loooks like it could be time for a Road Trip...... I'm in Mass... :)

Hey Jack, In Due Time My Baby Will Be In Your Hands Just Needs To Up Some Money:(