Boost problems

**BLACKanREDgtp** · 07-03-2015

het guys I have a 97 gtp im have boost problems I was showing about 8 psi then I done some more mods an now its only showing 2.5 psi its showing it around 3500 to 5000 rpm after that it drops even more to around 1.8 an I cant figure out what is going on any help you guys could give I would really appreciate ill give u a list of my mods at the bottom

p&p s/c
p&p lim
3.3 s/c pulley
cai
high flow fuel filter
3" catless down pipe
new crankshaft .010
new 3800 Powdered Metal Connecting Rods
new crank an rod Bearings .010 under
new cam Bearings
new piston rings
140# valve springs
xp hot cam
double roller timing chain
new oil pump
resurfaced heads an block
zzp 1.0 PCM
new tranny
new Tensioner
ac delete
o2 sim
alt booster
front power log
egr delete
autolite 103s gapped at .50
new maf,iac,tps
got a new sc belt on the way
new plug wires
I believe that's everything once again thank you guys for your help

**BillBoost37** · 07-03-2015

Disconnect the vacuum line between the boost soleniod and actuator. Go for a drive..if boost is back, it's a bad soleniod.

**J57ltr** · 07-03-2015

What Bill said, then Who ported and polished your SC and LIM? Do you have any pics of them? I guess the car runs fine other than the boost?

Jeff

**chrsmi1** · 07-03-2015

Where in western NC you at? I live in Raleigh and have family in Statesville i'll be visiting week after next (going on a cruise monday, stopping by on the way back for a few days). If you haven't got it by then we could get together and i could give you a hand. I love working on GP's.

Like Bill said though, check your vacuum lines and actuator. Don't just assume they're right or anything like that, go through the lines systematically.

**BLACKanREDgtp** · 07-04-2015

I already bypassed the boost solenoid first thing I tried after reading sum other forums an checked the bypass valve zzp did the p&p sc an lim I'm just really puzzled I looked at the vaccum diagram an traced it back to see if everything was rite an it seemed like it was the way the pic showed idk tho ive tried everything I can think of I ordered a new sc belt just incase it was slipping I hadn't got it yet I'm really hoping its that chrsmi1 I leave up around boone nc

**BillBoost37** · 07-04-2015

Jeff..you know what to do. Walk him through step by step, and make sure you get the pictures of the ford check valve. lol

**J57ltr** · 07-04-2015

Well let's see some pictures of the nipple under the snout of the supercharger. A picture of the line to the bypass solenoid and bypass valve. Then a picture of the tubing to the MAP sensor. There is another vacuum like on the pre 04' cars so one of that as well. How does the power feel? Does it feel like you have 2.5# of boost?

Jeff

**BLACKanREDgtp** · 07-05-2015

Uh it feels a bit sluggish it's not as potent as it was with the boost but it's not dead in the water feeling ya kno but ill Def get you sum pics of the vaccum lines an the t under the supercharger an to the bbv I really do appreciate you guys help on this

**J57ltr** · 07-05-2015

Man I just got through a situation with NO boost so we should be able to solve this pretty easy.

Jeff

**BillBoost37** · 07-05-2015

Originally Posted by J57ltr

Man I just got through a situation with NO boost so we should be able to solve this pretty easy.

Jeff

Especially since you tested/checked everything twice.

I'm also watching, just busy. Figured you had this one.

**J57ltr** · 07-05-2015

At least twice. Let us know even if you find the problem without having to post pics. That way others can benefit from your solved issue.

Jeff

**BLACKanREDgtp** · 07-07-2015

It won't let me post any pics for some reason but I'm gonna make a video of the lines an everything an give you a link to it I just noticed when I was messing with it when the cars running if u hit the throttle the supercharger belt has alot of movement in it so I'm starting to wonder if the belts just shot on the supercharger cause when I rebuilt everything I put a new supercharged tensioner on her an idk if the belts ever been changed I kno I hadn't changed it since I've owned it I did order a new one just waitn for it to come in but I'll have a link up to the video asap thanks guys

**BillBoost37** · 07-07-2015

Send a picture of the SC belt tensioner and where the two nubs on the back are sitting on the coil bracket to my user name at gmail.com

To post pics etc.. use a hosting site like photobucket and link the img here.

**Slick2500** · 07-07-2015

Blackandredgtp upload pics to photobucket or something similar then link them here.

**BillBoost37** · 07-07-2015

Yawn.. ^^^ sounds familiar lol

**Slick2500** · 07-07-2015

Originally Posted by BillBoost37

Yawn.. ^^^ sounds familiar lol

You ninjad me bill

**BLACKanREDgtp** · 07-07-2015

heres a link to youtube where the video is I gotta get to work but ill check back with u guys when I take a break https://youtu.be/nyMDcuEtuWo

**Scottydoggs** · 07-07-2015

you did your lines all wrong. your evap is on the TB, the fat port, not the two lines on the tree atop the sc. one of those lines goes to your hvac to power where the vents blow to, the other goes to the bbv.

do over time. no wonder you got no boost........

**BillBoost37** · 07-07-2015

DAmmmmit, I couldn't see it at .. er work so I was gonna review on the way to the car.

Scotty for the ...whine!

**Scottydoggs** · 07-07-2015

bill dont be drinking anything when you watch the vid lol the loop between the two sc tree ports is priceless even more so when he calls it the evap. lol

but it runs so theres hope. some quick re doing of them lines will make the car feel right again.